SW3230302_Design Calculations_20240417

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community infrastructure consultants
Davis Village Subdivision
WKD # 20230964.00.CL
CALCULATIONS FOR:
BMP Pond Revision
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Mar 28 2024 5:42 PM
1213 W. MOREHEAD STREET, SUITE 300, CHARLOTTE, NORTH CAROLINA 28208
TEL [phone] FAX [phone] www.WKDickson.com

Davis Village Subdivision o►WI<
PROJECT NO.: 20230964.00.CL BY: ESL D I C I<ScDN
DATE: 3/28/2024 T.M.: ETS community infrastructure consultants
REVISED: P.M.: ETS PRE/POST DEVELOPMENT CURVE NUMBERS
CURVE NUMBER:
Predeveloped CN
Cover Type Area(SF) % CN Wtd. CN
Woods/Grass(B Soils) 3390330 0.92 50.50
Pasture(B Soils) 233477 0.06 3.86
Existing Impervious 68390 0.02 1.82
Total 3692197 1.00 56.18
Composite CN 56.18 Use CN= 56
Postdeveloped CN BMP#A
Cover Type Area(SF) % CN Wtd. CN
Roadway 141028 0.12 11.33
Sidewalk 45439 0.04 3.65
Buildings 427875 0.35 34.37
Grass (B Soils) 605720 0.50 39.72
Total 1220062 1.00 89.06
Composite CN 89.06 Use CN=
Postdeveloped CN BMP#B
Cover Type Area(SF) % CN Wtd. CN
Roadway 54985 0.18 18.07
Sidewalk 19378 0.06 6.37
Buildings 42000 0.14 13.80
Grass(B Soils) 162566 0.55 43.61
Amenity 19288 0.06 6.34
Total 298217 1.00 88.19
Composite CN 88.19 Use CN=
Postdeveloped CN BMP#C
Cover Type Area (SF) % CN Wtd. CN
Roadway 29469 0.15 98 14.26
Sidewalk 9606 0.05 98 4.65
Buildings 64500 0.32 98 31.20
Existing Impervious 1540 0.01 98 0.75
Parking 8842 0.04 98 4.28
Grass (B Soils) 88617 0.44 80 35.00
Total 202574 1.00 90.13
Composite CN 90.13 Use CN=
Postdeveloped CN Bypass
Cover Type Area (SF) % CN Wtd. CN
Roadway 15584 0.02 1.86
Buildings 127555 0.16 15.24
Sidewalk 4420 0.01 0.53
Pasture(B Soils) 672496 0.82 45.10
Total 820055 1.00 62.74
Composite CN 62.74 Use CN=

Davis Village Subdivision 'PkWI<
PROJECT NO.: 20230964.00.CL BY: ESL Mar Co I C I<SO N
DATE: 3/28/2024 T.M.: ETS community infrastructure consultants
REVISED: P.M.: ETS IMPERVIOUS CALCULATIONS
Impervious Calculations for Basins
BMP A
Drainage Area 28.01 acres
Impervious Areas
Right of Way(paving, curb, sidewalk, parking lot)= 186467 sf #Lots sf/lot
Lots(building, sidewalk, concrete patios, driveways, etc.)= 427875 sf 122.25 3500
Total Impervious= 614342 sf
Percent Impervious= 50.35%
BMP B
Drainage Area 6.85 acres
Impervious Areas
Right of Way(paving, curb, sidewalk)= 74363 sf #Lots sf/lot
Lots(building, sidewalk, concrete patios, driveways, etc.)= 42000 sf 12.00 3500
Amenity= 19288 sf
Total Impervious= 135651 sf
Percent Impervious= 45.49%
BMP C
Drainage Area 4.65 acres
Impervious Areas
Right of Way(paving, curb, sidewalk)= 49457 sf #Lots sf/lot
Lots(building, sidewalk, concrete patios, driveways, etc.)= 64500 sf 37.50 1720
Total Impervious= 113957 sf
Percent Impervious= 56.25%
BYPASS
Drainage Area 18.83 acres
Impervious Areas #Lots sf/lot
Right of Way(paving, curb, sidewalk)= 20004 sf 6.50 1720
Lots(building, sidewalk, concrete patios, driveways, etc.)= 127555 sf 33.25 3500
Total Impervious= 147559 sf
Percent Impervious= 17.99%

Davis Village Subdivision ►WK
PROJECT NO.: 20230964.00.CL BY: ESL Ma,i I C I<SD N
DATE: 3/28/2024 T.M.: ETS community ir*frostructure oonsultomts
REVISED: P.M.: ETS WATER QUALITY BASIN CALCULATIONS-WETPOND#A
WATER QUALITY REQUIREMENTS
To meet the Water Quality requirements,the procedure outlined in the"Stormwater Best
Management Practices"published by NCDENR will be used. This guide gives the
required pond surface area and storage volume to meet an 85%pollutant removal
efficiency. Also,the pond must detain the first 1"of rainfall and release this volume
over a period of 2 to 5 days.Calculations for these requirements are as follows:
% PERMANENT POOL DEPTH
Surface area requirements Impervious 3_ 4 5 6 7 8
Drainage area to pond(Da)= 28.01 Ac 10 0.51 0.43 0.37 0.3 0.27 _ 0.25
Post-development impervious percentage= 50% 20 0.84 0.69 0.61 0.51 0.44 0.4
Average pool depth= 4 ft 30 1.17 0.94 0.84 0.72 0.61 0.56
Designed permanent pool elevation= 555.5 40 1.51 1.24 1.09 0.91 0.78 0.71
50 1.79 1.51 1.31 1.13 0.95 0.87
60 2.09 1.77 1.49 1.31 1.12 1.03
Interpolation to find required SA/DA ratio for non whole number 70 2.51 2.09 1.8 1.56 1.34 1.17
Storage 80 2.92 2.41 2.07 1.82 1.62 1.4
Depth volume 90 3.25 2.64 2.31 2.04 1.84 1.59
4 1.52
4 1.52
5 1.32
From table 1.1 in the BMP guidelines the required Surface Area to Drainage Area
Ratio(SA/DA)for a permanent pool depth= 1.52
Required surface area=SA/DA/100 x Drainage area= 0.43 Ac 18535.023
Surface area of pond as designed at permanent pool elevation= 0.63786 Ac Average Depth Calculations
Equation 2 Equation 3
1"rainfall requirements vPP = 4.055 D VPP-Vshelf 4.39
Using the runoff volume calculations in the"Simple Method": DAVG SA AVG Abottom of shelf
SA 27785 A6onom of shelf=25512
Rv=0.05+0.9(I) VPP= 112672 Vshuf= 590.25
Rv= 0.5032 in/in Perimeter.m,n,,,=787
Vshei f=0.5 *Depthmax over shelf*Perimeterperm pool*Width submerged part of shelf
Volume=(Design rainfall)(Rv)(Drainage Area)
Volume=1"rainfall x Rv in/in x 1/12 in/ft x Da= *Depth rounded down to nearest 0.5*
or 1.17 ac-ft *USE EQUATION 2*
This volume must be released over a period of 2-5 days 51159 ft^3
As designed pond areas: Permanent Pond Storage Volume r -
Elevation Forebay Forebay FB Volume FB Volume Pond Pond Pond Volume Pond Volume
Storage Volumes (msl) (of) (as) (cu-ft) (ac-ft) (of) (an) (cu-ft) (ac-ft)
Cumulative 550 I 805 I 0.0185 0 I 0.0000 II 11695 10.2685 II 0 I 0.0000 I'
Elevation Area(ac) Volume(ac-ft) 551 I 1688 I 0.0388 1218 I 0.0280 II 16817 lI 0.3861 II 14165 I 0.3252 I
555.5 0.794 0.00 552 I 2668 I 0.0612 3376 I 0.0775 II 18886 10.4336 II 31988 I 0.7343 [
556 0.862 0.41 553 I 3745 lI 0.0860 6564 I 0.1507 I[ 21026 10.4827 II 51915 I 1.1918 I
557 0.946 1.32 554 4914 I 0.1128 10876 I 0.2497 23224 0.5331 II 74008 I 1.6990 I
558 1.029 2.30 555 6150 I 0.1412 16391 I 0.3763 25512 0.5857 II 98343 I 2.2576 I
559 1.113 3.37 555.5 6793 I 0.1559 19536 I 0.4505 27785 0.6379 II 112672 I 2.5866 I
560 1.198 4.53 556 7453 I 0.1711 23092 I 0.5321 30106 0.6911 II- 127126 I 2.9184 1
561 1.241 5.74 557 0 I 0.0000 25574 I 0.0000 41209 0.9460II 162603 I 3.7329 I
558 0 lI 0.0000 25574 I 0.0000 44809 1 1.0287 II 205557 I 4.7189 I
559 0 I 0.0000 25574 0.0000 48473 1.1128 II 252139 5.7883 I
560 0 -II 0.0000 25574 0.0000 52204 1.1984 II 302416 6.9425
560.5 0 I 0.0000 25574 0.0000 54057 1.2410 II 328953 7.5517 [
I II I
Forebay Volume(CF) 23092 I II [ r
Main Pool Volume(CF) 127126 I II
Forebay%of Pond 18.16% I II [
I II I
I II I
I II I
Interpolation to find elevation at which required storage volume is reached
Storage Storage Storage
Elev volume area(ac.) area(cf.)
556 0.41 0.86 37559
Elev 1.17 0.93 40635
557 1.32 0.95 41209
Elev= 556.84
Storage elevation= 1.34 feet above permanent pool elevation
Determination of Orifice size for 2-5 day drawdown
a=2A x sqrt(h) *Falling head equation C= Orifice constant 32.2 ft/s^2
Ct(sqrt(2g)) 1.34 ft
Minimum orifice area= 0.6
a=Area of orifice Minimum orifice size=
t=Time to drawdown Selected orifice size= 0.09 sqft
4.0 inches
A=Average pond surface area a sqft
g=Gravity constant 190080 sec (2.2 day drawdown) 4.00 inches
h=Change in head 34210 sf

BMP#B STAGE-STORAGE TABLE
Sand Filter Forebay(Basin Bottom to Top of Forebay)
ELEVATION DEPTH CHANGE SURFACE AREA INC.VOLUME TOTAL VOLUME TOTAL VOLUME
_ ft. ft, sq.ft. cu.ft. cu.ft. ac-ft
0 0 0.000
575.0 6,224
1.0 6,702 6,702 0.154
576.0 7,192
1.0 7,696 14,398 0.331
577.0 8,211
0.5 4,237 18,635 0.428
577.5 8,738 _
STAGE-STORAGE TABLE
Sand Filter(Basin Bottom to Top of Forebay)
ELEVATION DEPTH CHANGE SURFACE AREA INC.VOLUME TOTAL VOLUME TOTAL VOLUME
ft. ft, sq.ft. cu.ft. cu.ft. ac-ft
-
0 0 0.000
575.0 1,427
1.0 1,669 1,669 0.038
576.0 1,923
1.0 2,197 3,865 0.089
577.0 2,482
0.5 1,316 5,181 0.119
577.5 2,785
STAGE-STORAGE TABLE
Sand Filter(Filter Bottom to Top of Berm)
ELEVATION DEPTH CHANGE SURFACE AREA INC.VOLUME TOTAL VOLUME TOTAL VOLUME
ft. ft, sq.ft. cu.ft. cu.ft. ac-ft
0 0 0.000
575.0 7,651
1.0 8,372 8,372 0.192
576.0 9,115
1.0 9,894 18,266 0.419
577.0 10,693
1.0 11,529 29,794 0.684
578.0 12,385
1.0 34,220 42,593 0.978
579.0 13,864
1.0 38,913 57,179 1.313
580.0 15,391

Project Name: Davis Village Subdivision
Project Number: 20230964.00.CL
Given Information:
Land Use: Single Family Development
Drainage Area to Facility(Acres): 6.85
Impervious Area(Acres): 3.11
Percent Impervious: 45.5%
Soil Type: CmB
Soil Group: D
Curve Number(CN)Pre: 84
Curve Number(CN)Post: 88
Time of Concentration Pre(hour): 0.6667
Time of Concentration Post(hour): 0.0833
Design Storm Rainfall Depth(in): 1.0 (Typically 1")
Detention Time(Day): 1.66 Meck.County:
2 days-85%TSS&70%TP(Optimal Efficiency)
1 day-70%TSS&35%TP(Standard Efficiency)
2 days-85%TSS&0%TP(TSS-Only Efficiency)
NCDENR
1.66 days
Coefficient of Permeability for the Sand Filter Bed: 1.75 inches/hour
Watershed: N/A
Efficiency: NCDEQ

Sand Filter Design (NCDEQ)
Project Name: Davis Village Subdivision
Job Number: 20230964.00.CL
BMP #B
Step 1: Compute the water quality volume (WQV).
WQV(Ft3)= (Rv/1)X(AD/ 1)X(43,560 Ft2/ 1 Acre)X(RD/1)X(1 Ft/ 12 i n)
WQVAdJ(Ft3)= (0.75)WQV
Where:
WQV=Water Quality Volume(Ft3)
WQVAdJ=Adjusted Water Quality Volume(Ft3)
AD= Drainage Area to Sand Filter(acres). Max. 5 acres.
Rv=Volumetric Runoff Coefficient=0.05+0.9(% Impervious)
RD= Design Storm Rainfall Depth (in).Typically 1.0".
Percent Impervious= 45%
AD= 6.85 acres
RD= 1.0 in
Rv= 0.46
WQV= 11,416 Ft3
WQVAdJ= 8,562 Fe
Step 2: Determine the maximum head on the sand filter and sedimentation basin.
ha (ft)= hMaxFilter/2
hMaxFilter(Ft)= (WQVAdJ)/(As+Af)
As(Ft2)=-(Q0/w)x(In (1 -E))
Af(Ft2)= (WQV x dF)/(k x t x(hA+dF))
Q(Ft3/Sec)= k x(1 Day/86,400 Sec)x(Af)x((ha +dF)/dF)
Where:
ha=Average Head (Ft)

hMaxFilter= Maximum Head on the Sand Filter(Ft)
As= Surface Area of the Sedimentation Basin (Ft2)
Af=Surface Area of the Sand Filter Bed (Ft2)
Qo=Average Rate of Outflow From Sedimentation Chamber(Ft3/sec.)=WQV/86,400
E =Trap Efficiency of the Chamber= 0.9
w= Settling Velocity of Particle (Ft/sec)(Assume Particle Diameter of 20 microns=0.0004 Ft/sec)
dF= Depth of Sand Filter Bed (Ft)
k=Coefficient of Permeability for the Sand Filter Bed = 3.5 Ft/day
t=Time Required to Drain the WQV through the Sand Filter Bed (day).
Q=Sand Filter Infiltration Rate at hMaxFilter(Ft3/Sec). (Darcy's Law)
For maximum heads between 2 and 6 feet, the following combinations of variables will work:
(Ideal situation As=Af)
hMaxFilter WQVAaJ As+Af
(Ft) (Ft3) (Ft2)
2 8,562 4,281
3 8,562 2,854
4 8,562 2,141
5 8,562 1,712
6 8,562 1,427
Area available for sand filter= 7,651 Ft2
hMaxFilter= 1.12 Ft
ha= 0.6 Ft
Minimum As= 761 Ft`
dF= 1.5 Ft
k= 3.5 Ft/day
t= 1.66 day
Minimum Af= 1,403 Ft`
Min. required area for sand filter= 2,164 Ft2 TRUE
Af= 1,427 Ft`
As= 6,224 Ft`

hMaxFilter= 1.1 Ft
ha= 0.6 Ft
Q= 0.081 Ft3/Sec
Step 3: Ensure that the Water Quality Volume is Contained.
(Af+As)x hMaxFilter WQVAdj
8,562 Ft3 >_ 8,562 Ft3 TRUE
Step 4: Additional Design Requirements.
For underground sand filters, provide at least 5 feet of clearance between the surface of
the sand filter and the bottom of the roof of the underground structure to facilitate
cleaning and maintenance.
Step 5: Calculate Surface Area and Underdrain Requirements
Q(Ft3/Sec)= k x(1 Day/86,400 Sec)x(Af)x((ha +dF)/dF)
Where:
ha=Average Head (Ft)
hMaxFilter= Maximum Head on the Sand Filter(Ft)(Maximum of 2.0 Ft)
Af=Surface Area of the Sand Filter Bed (Ft2)
As= Surface Area of the Sedimentation Basin (Ft2)
Cd= Sediment Chamber Depth (Ft)
dF= Depth of Sand Filter Bed (Ft)(Minimum of 2.0 Ft)
k=Coefficient of Permeability for the Sand Filter Bed = 3.5 Ft/day
QAveFilter=Sand Filter Infiltration Rate at ha (Ft3/Sec). (Darcy's Law)
Qo=Sand Filter Infiltration Rate at Top of Sand (Ft3/Sec). (Darcy's Law)
WQVAdj= 8,562 Ft'
Required Af= 1,403 Ft`
Provided Af= 1,427 Ft`

Required AS= 761 Ft`
Provided AS= 6,224 Ft`
Required Cd= 0.5 Ft
Provided Cd= 2.5 Ft
QAveFilter= 0.081 Ft'/Sec
Qo= 0.000 Ft'/Sec
Drawdown = 0.059 Ft3/Sec
Number of Underdrain Rows Required = 2 (Maximum Spacing = 10 Ft)
Total Length of Underdrain =I 15 Ft
Number of Underdrain Perforations = 104 Holes
50% of Perforations= 52 Holes
Area of One Perforation = 0.00077 Ft2
Capacity of One Hole= 0.0054 Ft3/Sec
Total Capacity of Perforations= 0.28 Ft3/Sec
Check:
0.28 Ft3/Sec > 0.081 Ft3/Sec :. GOOD
Capacity of 6" PVC Underdrain at 0.50%Slope= 0.39 Ft3/Sec
Assume 50% Clogging = 0.20 Ft3/Sec
Check:
0.20 Ft3/Sec > 0.081 Ft3/Sec :. GOOD

BMP#C STAGE-STORAGE TABLE
Sand Filter Forebay(Basin Bottom to Top of Forebay)
ELEVATION DEPTH CHANGE SURFACE AREA INC.VOLUME TOTAL VOLUME TOTAL VOLUME
ft. ft, sq.ft. cu.ft. cu.ft. ac-ft
-
0 0 0.000
550.0 3,670
1.0 4,313 4,313 0.099
551.0 4,989
1.0 5,685 9,998 0.230
552.0 6,411
1.0 7,160 17,158 0.394
553.0 7,937
STAGE-STORAGE TABLE
Sand Filter(Basin Bottom to Top of Forebay)
ELEVATION DEPTH CHANGE SURFACE AREA INC.VOLUME TOTAL VOLUME TOTAL VOLUME
ft. ft, sq.ft. cu.ft. cu.ft. ac-ft
-
0 0 0.000
550.0 913
1.0 1,105 1,105 0.025
551.0 1,309
1.0 1,537 2,642 0.061
552.0 1,776
1.0 1,994 4,636 0.106
553.0 2,221
STAGE-STORAGE TABLE
Sand Filter(Filter Bottom to Top of Berm)
ELEVATION DEPTH CHANGE SURFACE AREA INC.VOLUME TOTAL VOLUME TOTAL VOLUME
ft. ft, sq.ft. cu.ft. cu.ft. ac-ft
0 0 0.000
550.0 4,583
1.0 5,418 5,418 0.124
551.0 6,298
1.0 7,222 12,640 0.290
552.0 8,187
1.0 9,155 21,795 0.500
553.0 10,158
1.0 27,085 32,503 0.746
554.0 12,069
1.0 32,697 45,336 1.041
555.0 13,858
1.0 14,772 60,109 1.380

Project Name: Davis Village Subdivision
Project Number: 20230964.00.CL
Given Information:
Land Use: Single Family Development
Drainage Area to Facility(Acres): 4.65 NCDEQ(Maximum 5 Acres)
Meck.County(Maximum 10 Ac for a Surface Filter)
Meck.County(Maximum 2 Ac for a Perimeter Filter)
Meck.County(Maximum 5 Ac for an Underground Filter)
Impervious Area(Acres): 2.62
Percent Impervious: 56.3%
Soil Type: CmB
Soil Group: B
Curve Number(CN)Pre: 80
Curve Number(CN)Post: 90
Time of Concentration Pre(hour): 0.6667
Time of Concentration Post(hour): 0.0833
Design Storm Rainfall Depth(in): 1.0 (Typically 1")
Detention Time(Day): 1.66 Meck.County:
2 days-85%TSS&70%TP(Optimal Efficiency)
1 day-70%TSS&35%TP(Standard Efficiency)
2 days-85%TSS&0%TP(TSS-Only Efficiency)
NCDENR
1.66 days
Coefficient of Permeability for the Sand Filter Bed: 1.75 inches/hour
Watershed: N/A
Efficiency: NCDEQ

Sand Filter Design (NCDEQ)
Project Name: Davis Village Subdivision
Job Number: 20230964.00.CL
BMP #C
Step 1: Compute the water quality volume (WQV).
WQV(Ft3)= (Rv/1)X(AD/ 1)X(43,560 Ft2/ 1 Acre)X(RD/1)X(1 Ft/ 12 i n)
WQVAdJ(Ft3)= (0.75)WQV
Where:
WQV=Water Quality Volume(Ft3)
WQVAdJ=Adjusted Water Quality Volume(Ft3)
AD= Drainage Area to Sand Filter(acres). Max. 5 acres.
Rv=Volumetric Runoff Coefficient=0.05+0.9(% Impervious)
RD= Design Storm Rainfall Depth (in).Typically 1.0".
Percent Impervious= 56%
AD= 4.65 acres
RD= 1.0 in
Rv= 0.56
WQV= 9,391 Ft3
WQVAdJ= 7,043 Fe
Step 2: Determine the maximum head on the sand filter and sedimentation basin.
ha (ft)= hMaxFilter/2
hMaxFilter(Ft)= (WQVAdJ)/(As+Af)
As(Ft2)=-(Q0/w)x(In (1 -E))
Af(Ft2)= (WQV x dF)/(k x t x(hA+dF))
Q(Ft3/Sec)= k x(1 Day/86,400 Sec)x(Af)x((ha +dF)/dF)
Where:
ha=Average Head (Ft)

hMaxFitter= Maximum Head on the Sand Filter(Ft)
As= Surface Area of the Sedimentation Basin (Ft2)
Af=Surface Area of the Sand Filter Bed (Ft2)
Qo=Average Rate of Outflow From Sedimentation Chamber(Ft3/sec.)=WQV/86,400
E =Trap Efficiency of the Chamber= 0.9
w= Settling Velocity of Particle (Ft/sec)(Assume Particle Diameter of 20 microns=0.0004 Ft/sec)
dF= Depth of Sand Filter Bed (Ft)(Minimum of 1.0 Ft)
k=Coefficient of Permeability for the Sand Filter Bed = 3.5 Ft/day
t=Time Required to Drain the WQV through the Sand Filter Bed (day).
Q=Sand Filter Infiltration Rate at hMaxFitter(Ft3/Sec). (Darcy's Law)
For maximum heads between 2 and 6 feet, the following combinations of variables will work:
(Ideal situation As=Af)
hMaxFitter WQVAaJ As+Af
(Ft) (Ft3) (Ft2)
2 7,043 3,522
3 7,043 2,348
4 7,043 1,761
5 7,043 1,409
6 7,043 1,174
Area available for sand filter= 4,583 Ft2
hMaxFitter= 1.54 Ft
ha= 0.8 Ft
Minimum As= 626 Ft`
dF= 1.0 Ft
k= 3.5 Ft/day
t= 1.66 day
Minimum Af= 898 Ft`
Min. required area for sand filter= 1,524 Ft2 TRUE
Af= 913 Ft`
As= 3,670 Ft`

hMaxFilter= 1.5 Ft
ha = 0.8 Ft
Q= 0.067 Ft3/Sec
Step 3: Ensure that the Water Quality Volume is Contained.
(Af+As)x hMaxFilter WQVAdj
7,043 Ft3 >_ 7,043 Ft3 TRUE
Step 4: Additional Design Requirements.
For underground sand filters, provide at least 5 feet of clearance between the surface of
the sand filter and the bottom of the roof of the underground structure to facilitate
cleaning and maintenance.
Step 5: Calculate Surface Area and Underdrain Requirements
Q(Ft3/Sec)= k x(1 Day/86,400 Sec)x(Af)x((ha +dF)/dF)
Where:
ha=Average Head (Ft)
hMaxFilter= Maximum Head on the Sand Filter(Ft)(Maximum of 2.0 Ft)
Af=Surface Area of the Sand Filter Bed (Ft2)
As= Surface Area of the Sedimentation Basin (Ft2)
Cd= Sediment Chamber Depth (Ft)
dF= Depth of Sand Filter Bed (Ft)(Minimum of 2.0 Ft)
k=Coefficient of Permeability for the Sand Filter Bed = 3.5 Ft/day
QAveFilter=Sand Filter Infiltration Rate at ha (Ft3/Sec). (Darcy's Law)
Qo=Sand Filter Infiltration Rate at Top of Sand (Ft3/Sec). (Darcy's Law)
WQVAdj= 7,043 Ft'
Required Af= 898 Ft`
Provided Af= 900 Ft`

Required AS= 626 Ft`
Provided AS= 3,670 Ft`
Required Cd= 1 Ft
Provided Cd= 3 Ft
QAveFilter= 0.066 Ft'/Sec
Qo= 0.000 Ft'/Sec
Drawdown = 0.049 Ft3/Sec
Number of Underdrain Rows Required = 2 (Maximum Spacing = 10 Ft)
Total Length of Underdrain = 30 Ft
Number of Underdrain Perforations = 224 Holes
50% of Perforations= 112 Holes
Area of One Perforation = 0.00077 Ft2
Capacity of One Hole= 0.0050 Ft3/Sec
Total Capacity of Perforations= 0.56 Ft3/Sec
Check:
0.56 Ft3/Sec > 0.066 Ft3/Sec :. GOOD
Capacity of 6" PVC Underdrain at 0.50%Slope= 0.39 Ft3/Sec
Assume 50% Clogging = 0.20 Ft3/Sec
Check:
0.20 Ft3/Sec > 0.066 Ft3/Sec :. GOOD

<PRE#>
DA#1 D BMP-1
Predevelopment#1 Post-Development Pond BMP #1
#1
<PRE#2 DA#2 D BMP-2
Predevelopment#2 Post-Development Pond BMP #2
#2
<PRE#>
<DA#3>
D BMP#3
Predevelopment#3 Post-Development Pond BMP #3
#3
KSubcat Reach 'ono Link Routing Diagram for Davis Village
Prepared by WK Dickson, Printed 4/12/2024
HydroCAD®10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC

Detention
Davis Village
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 2
Project Notes
Rainfall events imported from "BMP-1 CALCULATIONS_20220412.hcp"
Copied 6 events from Charlotte 6-hr storm

Detention
Davis Village
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 3
Area Listing (all nodes)
Area CN Description
(acres) (subcatchment-numbers)
19.671 80 >75% Grass cover, Good, HSG D (DA#1, DA#2, DA#3)
0.443 98 Amenity Impervious (DA#2)
12.268 98 Buildings/Driveways (DA#1, DA#2, DA#3)
0.035 98 Ex. Impervious (DA#3)
0.203 98 Parking (DA#3)
62.866 84 Pasture/grassland/range, Fair, HSG D (PRE#1, PRE#2, PRE#3)
5.177 98 Roadway (DA#1, DA#2, DA#3)
1.709 98 Sidewalk (DA#1, DA#2, DA#3)
102.372 86 TOTAL AREA

Detention
Davis Village
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 4
Pipe Listing (all nodes)
Line# Node In-Invert Out-Invert Length Slope n Width Diam/Height Inside-Fill Node
Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) Name
1 BMP#3 549.50 548.96 85.0 0.0064 0.013 0.0 24.0 0.0
2 BMP-1 550.00 548.00 115.0 0.0174 0.013 0.0 36.0 0.0
3 BMP-2 574.40 574.00 88.0 0.0045 0.013 0.0 24.0 0.0

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 5
Time span=0.00-120.00 hrs, dt=0.10 hrs, 1201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA#1: Post-Development Runoff Area=28.009 ac 50.36% Impervious Runoff Depth=0.28"
Tc=5.0 min CN=89 Runoff=16.05 cfs 0.665 af
Subcatchment DA#2: Post-Development Runoff Area=6.846 ac 45.49% Impervious Runoff Depth=0.25"
Tc=5.0 min CN=88 Runoff=3.45 cfs 0.144 of
Subcatchment DA#3: Post-Development Runoff Area=4.651 ac 56.27% Impervious Runoff Depth=0.32"
Tc=5.0 min CN=90 Runoff=3.02 cfs 0.124 of
Subcatchment PRE#1: Predevelopment#1 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=0.15"
Tc=29.5 min CN=84 Runoff=3.88 cfs 0.354 af
Subcatchment PRE#2: Predevelopment#2 Runoff Area=6.846 ac 0.00% Impervious Runoff Depth=0.15"
Tc=31.9 min CN=84 Runoff=0.91 cfs 0.087 af
SubcatchmentPRE#3: Predevelopment#3 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=0.15"
Tc=31.9 min CN=84 Runoff=3.73 cfs 0.354 af
Pond BMP#3: BMP#3 Peak Elev=550.84' Storage=4,468 cf Inflow=3.02 cfs 0.124 af
Primary=0.08 cfs 0.124 af Secondary=0.00 cfs 0.000 af Outflow=0.08 cfs 0.124 af
Pond BMP-1: BMP#1 Peak EIev=556.20' Storage=25,490 cf Inflow=16.05 cfs 0.665 af
Primary=0.35 cfs 0.665 af Secondary=0.00 cfs 0.000 af Outflow=0.35 cfs 0.665 af
Pond BMP-2: BMP#2 Peak Elev=575.66' Storage=5,364 cf Inflow=3.45 cfs 0.144 af
Primary=0.08 cfs 0.144 af Secondary=0.00 cfs 0.000 af Outflow=0.08 cfs 0.144 af
Total Runoff Area = 102.372 ac Runoff Volume = 1.729 af Average Runoff Depth = 0.20"
80.62% Pervious = 82.537 ac 19.38% Impervious = 19.835 ac

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment DA#1: Post-Development Pond #1
Runoff = 16.05 cfs @ 3.19 hrs, Volume= 0.665 af, Depth= 0.28"
Routed to Pond BMP-1 : BMP #1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
• 3.238 98 Roadway
• 1.043 98 Sidewalk
• 9.823 98 Buildings/Driveways
13.905 80 >75% Grass cover, Good, HSG D
28.009 89 Weighted Average
13.905 49.64% Pervious Area
14.104 50.36% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#1: Post-Development Pond #1
Hydrograph
— •Runoff
16.05 cfs lidrikttir t� IlCll
14/
14: 1 I tRai�f1II .10i"13Y Runoff Ar 28.QO9-at
12=
11- Runoff 1/11I4m1et0. _6 f
• 97 _L ! L!rirlD71: h7_°'121" I
o nun _
LT. �5.Q
0 lf/,ff/ f/S //ll( S(/ l(/ l/,/l(/,/(// (/l/llff( l/,(ff(,/f// / lfr
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 7
Hydrograph for Subcatchment DA#1: Post-Development Pond #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 1.00 0.28 0.00
2.00 0.11 0.00 0.00 106.00 1.00 0.28 0.00
4.00 0.88 0.22 1.75 108.00 1.00 0.28 0.00
6.00 1.00 0.28 0.61 110.00 1.00 0.28 0.00
8.00 1.00 0.28 0.00 112.00 1.00 0.28 0.00
10.00 1.00 0.28 0.00 114.00 1.00 0.28 0.00
12.00 1.00 0.28 0.00 116.00 1.00 0.28 0.00
14.00 1.00 0.28 0.00 118.00 1.00 0.28 0.00
16.00 1.00 0.28 0.00 120.00 1.00 0.28 0.00
18.00 1.00 0.28 0.00
20.00 1.00 0.28 0.00
22.00 1.00 0.28 0.00
24.00 1.00 0.28 0.00
26.00 1.00 0.28 0.00
28.00 1.00 0.28 0.00
30.00 1.00 0.28 0.00
32.00 1.00 0.28 0.00
34.00 1.00 0.28 0.00
36.00 1.00 0.28 0.00
38.00 1.00 0.28 0.00
40.00 1.00 0.28 0.00
42.00 1.00 0.28 0.00
44.00 1.00 0.28 0.00
46.00 1.00 0.28 0.00
48.00 1.00 0.28 0.00
50.00 1.00 0.28 0.00
52.00 1.00 0.28 0.00
54.00 1.00 0.28 0.00
56.00 1.00 0.28 0.00
58.00 1.00 0.28 0.00
60.00 1.00 0.28 0.00
62.00 1.00 0.28 0.00
64.00 1.00 0.28 0.00
66.00 1.00 0.28 0.00
68.00 1.00 0.28 0.00
70.00 1.00 0.28 0.00
72.00 1.00 0.28 0.00
74.00 1.00 0.28 0.00
76.00 1.00 0.28 0.00
78.00 1.00 0.28 0.00
80.00 1.00 0.28 0.00
82.00 1.00 0.28 0.00
84.00 1.00 0.28 0.00
86.00 1.00 0.28 0.00
88.00 1.00 0.28 0.00
90.00 1.00 0.28 0.00
92.00 1.00 0.28 0.00
94.00 1.00 0.28 0.00
96.00 1.00 0.28 0.00
98.00 1.00 0.28 0.00
100.00 1.00 0.28 0.00
102.00 1.00 0.28 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment DA#2: Post-Development Pond #2
Runoff = 3.45 cfs @ 3.19 hrs, Volume= 0.144 af, Depth= 0.25"
Routed to Pond BMP-2 : BMP #2
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
• 1.262 98 Roadway
• 0.445 98 Sidewalk
• 0.964 98 Buildings/Driveways
3.732 80 >75% Grass cover, Good, HSG D
• 0.443 98 Amenity Impervious
6.846 88 Weighted Average
3.732 54.51% Pervious Area
3.114 45.49% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#2: Post-Development Pond #2
Hydrograph
— ❑Runoff
3.45 cfs I ICha�rl�tte 8-I�r '�-illlcrl
3 * tRainf1 11 .001"
IRUnbff Area=6.846 ad
RLn9ff Volume=0.144 of
2 / !Runcfff 1:reph70.F-5"
Tc=5.0 m i n
CN=88
1 /
/
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 9
Hydrograph for Subcatchment DA#2: Post-Development Pond #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 1.00 0.25 0.00
2.00 0.11 0.00 0.00 106.00 1.00 0.25 0.00
4.00 0.88 0.19 0.40 108.00 1.00 0.25 0.00
6.00 1.00 0.25 0.14 110.00 1.00 0.25 0.00
8.00 1.00 0.25 0.00 112.00 1.00 0.25 0.00
10.00 1.00 0.25 0.00 114.00 1.00 0.25 0.00
12.00 1.00 0.25 0.00 116.00 1.00 0.25 0.00
14.00 1.00 0.25 0.00 118.00 1.00 0.25 0.00
16.00 1.00 0.25 0.00 120.00 1.00 0.25 0.00
18.00 1.00 0.25 0.00
20.00 1.00 0.25 0.00
22.00 1.00 0.25 0.00
24.00 1.00 0.25 0.00
26.00 1.00 0.25 0.00
28.00 1.00 0.25 0.00
30.00 1.00 0.25 0.00
32.00 1.00 0.25 0.00
34.00 1.00 0.25 0.00
36.00 1.00 0.25 0.00
38.00 1.00 0.25 0.00
40.00 1.00 0.25 0.00
42.00 1.00 0.25 0.00
44.00 1.00 0.25 0.00
46.00 1.00 0.25 0.00
48.00 1.00 0.25 0.00
50.00 1.00 0.25 0.00
52.00 1.00 0.25 0.00
54.00 1.00 0.25 0.00
56.00 1.00 0.25 0.00
58.00 1.00 0.25 0.00
60.00 1.00 0.25 0.00
62.00 1.00 0.25 0.00
64.00 1.00 0.25 0.00
66.00 1.00 0.25 0.00
68.00 1.00 0.25 0.00
70.00 1.00 0.25 0.00
72.00 1.00 0.25 0.00
74.00 1.00 0.25 0.00
76.00 1.00 0.25 0.00
78.00 1.00 0.25 0.00
80.00 1.00 0.25 0.00
82.00 1.00 0.25 0.00
84.00 1.00 0.25 0.00
86.00 1.00 0.25 0.00
88.00 1.00 0.25 0.00
90.00 1.00 0.25 0.00
92.00 1.00 0.25 0.00
94.00 1.00 0.25 0.00
96.00 1.00 0.25 0.00
98.00 1.00 0.25 0.00
100.00 1.00 0.25 0.00
102.00 1.00 0.25 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 10
Summary for Subcatchment DA#3: Post-Development Pond #3
Runoff = 3.02 cfs @ 3.19 hrs, Volume= 0.124 af, Depth= 0.32"
Routed to Pond BMP#3 : BMP #3
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
• 0.677 98 Roadway
• 0.221 98 Sidewalk
• 1.481 98 Buildings/Driveways
2.034 80 >75% Grass cover, Good, HSG D
• 0.203 98 Parking
• 0.035 98 Ex. Impervious
4.651 90 Weighted Average
2.034 43.73% Pervious Area
2.617 56.27% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#3: Post-Development Pond #3
Hydrograph
❑Runoff
3.02 cfs
3 16hrItte 6-h r
Rainf�II 1.100"
IRUnbff Area=4.6511 ad
2 Ri npff-VplumeF0.1-24 f
3 /
Runoff Depth=0.32"
LL
Tc=5.0 min
6NL9b
/
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 11
Hydrograph for Subcatchment DA#3: Post-Development Pond #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 1.00 0.32 0.00
2.00 0.11 0.00 0.00 106.00 1.00 0.32 0.00
4.00 0.88 0.25 0.31 108.00 1.00 0.32 0.00
6.00 1.00 0.32 0.11 110.00 1.00 0.32 0.00
8.00 1.00 0.32 0.00 112.00 1.00 0.32 0.00
10.00 1.00 0.32 0.00 114.00 1.00 0.32 0.00
12.00 1.00 0.32 0.00 116.00 1.00 0.32 0.00
14.00 1.00 0.32 0.00 118.00 1.00 0.32 0.00
16.00 1.00 0.32 0.00 120.00 1.00 0.32 0.00
18.00 1.00 0.32 0.00
20.00 1.00 0.32 0.00
22.00 1.00 0.32 0.00
24.00 1.00 0.32 0.00
26.00 1.00 0.32 0.00
28.00 1.00 0.32 0.00
30.00 1.00 0.32 0.00
32.00 1.00 0.32 0.00
34.00 1.00 0.32 0.00
36.00 1.00 0.32 0.00
38.00 1.00 0.32 0.00
40.00 1.00 0.32 0.00
42.00 1.00 0.32 0.00
44.00 1.00 0.32 0.00
46.00 1.00 0.32 0.00
48.00 1.00 0.32 0.00
50.00 1.00 0.32 0.00
52.00 1.00 0.32 0.00
54.00 1.00 0.32 0.00
56.00 1.00 0.32 0.00
58.00 1.00 0.32 0.00
60.00 1.00 0.32 0.00
62.00 1.00 0.32 0.00
64.00 1.00 0.32 0.00
66.00 1.00 0.32 0.00
68.00 1.00 0.32 0.00
70.00 1.00 0.32 0.00
72.00 1.00 0.32 0.00
74.00 1.00 0.32 0.00
76.00 1.00 0.32 0.00
78.00 1.00 0.32 0.00
80.00 1.00 0.32 0.00
82.00 1.00 0.32 0.00
84.00 1.00 0.32 0.00
86.00 1.00 0.32 0.00
88.00 1.00 0.32 0.00
90.00 1.00 0.32 0.00
92.00 1.00 0.32 0.00
94.00 1.00 0.32 0.00
96.00 1.00 0.32 0.00
98.00 1.00 0.32 0.00
100.00 1.00 0.32 0.00
102.00 1.00 0.32 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 12
Summary for Subcatchment PRE#1: Predevelopment #1
Runoff = 3.88 cfs @ 3.58 hrs, Volume= 0.354 af, Depth= 0.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
29.5 Direct Entry,
Subcatchment PRE#1: Predevelopment #1
Hydrograph
0 Runoff
3.88 cfs
Clhrlbtte 6-hr 1-inch
Rainfall 1.b0
3 Iurho -f Area=28.0T0 ac
Ryncff Vplume=0. 511 of
_�t nipi Depth70.11 '
o 2 Tc= 9.5 min
GIN-84
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 13
Hydrograph for Subcatchment PRE#1: Predevelopment #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 1.00 0.15 0.00
2.00 0.11 0.00 0.00 106.00 1.00 0.15 0.00
4.00 0.88 0.10 2.11 108.00 1.00 0.15 0.00
6.00 1.00 0.15 0.52 110.00 1.00 0.15 0.00
8.00 1.00 0.15 0.00 112.00 1.00 0.15 0.00
10.00 1.00 0.15 0.00 114.00 1.00 0.15 0.00
12.00 1.00 0.15 0.00 116.00 1.00 0.15 0.00
14.00 1.00 0.15 0.00 118.00 1.00 0.15 0.00
16.00 1.00 0.15 0.00 120.00 1.00 0.15 0.00
18.00 1.00 0.15 0.00
20.00 1.00 0.15 0.00
22.00 1.00 0.15 0.00
24.00 1.00 0.15 0.00
26.00 1.00 0.15 0.00
28.00 1.00 0.15 0.00
30.00 1.00 0.15 0.00
32.00 1.00 0.15 0.00
34.00 1.00 0.15 0.00
36.00 1.00 0.15 0.00
38.00 1.00 0.15 0.00
40.00 1.00 0.15 0.00
42.00 1.00 0.15 0.00
44.00 1.00 0.15 0.00
46.00 1.00 0.15 0.00
48.00 1.00 0.15 0.00
50.00 1.00 0.15 0.00
52.00 1.00 0.15 0.00
54.00 1.00 0.15 0.00
56.00 1.00 0.15 0.00
58.00 1.00 0.15 0.00
60.00 1.00 0.15 0.00
62.00 1.00 0.15 0.00
64.00 1.00 0.15 0.00
66.00 1.00 0.15 0.00
68.00 1.00 0.15 0.00
70.00 1.00 0.15 0.00
72.00 1.00 0.15 0.00
74.00 1.00 0.15 0.00
76.00 1.00 0.15 0.00
78.00 1.00 0.15 0.00
80.00 1.00 0.15 0.00
82.00 1.00 0.15 0.00
84.00 1.00 0.15 0.00
86.00 1.00 0.15 0.00
88.00 1.00 0.15 0.00
90.00 1.00 0.15 0.00
92.00 1.00 0.15 0.00
94.00 1.00 0.15 0.00
96.00 1.00 0.15 0.00
98.00 1.00 0.15 0.00
100.00 1.00 0.15 0.00
102.00 1.00 0.15 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 14
Summary for Subcatchment PRE#2: Predevelopment #2
Runoff = 0.91 cfs @ 3.62 hrs, Volume= 0.087 af, Depth= 0.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
6.846 84 Pasture/grassland/range, Fair, HSG D
6.846 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#2: Predevelopment #2
Hydrograph
1� -
❑Runoff
0.91 cfs
2 6hrIbtte 6-h r
Rainfall=1.b0"
IRUnbff Area=6.846 ac
Rin9ff Vplume=0.087 of
/ !Runoff Dep h70.115"
Tc=31.9 min
LL
6NL84
o
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 15
Hydrograph for Subcatchment PRE#2: Predevelopment #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 1.00 0.15 0.00
2.00 0.11 0.00 0.00 106.00 1.00 0.15 0.00
4.00 0.88 0.10 0.55 108.00 1.00 0.15 0.00
6.00 1.00 0.15 0.13 110.00 1.00 0.15 0.00
8.00 1.00 0.15 0.00 112.00 1.00 0.15 0.00
10.00 1.00 0.15 0.00 114.00 1.00 0.15 0.00
12.00 1.00 0.15 0.00 116.00 1.00 0.15 0.00
14.00 1.00 0.15 0.00 118.00 1.00 0.15 0.00
16.00 1.00 0.15 0.00 120.00 1.00 0.15 0.00
18.00 1.00 0.15 0.00
20.00 1.00 0.15 0.00
22.00 1.00 0.15 0.00
24.00 1.00 0.15 0.00
26.00 1.00 0.15 0.00
28.00 1.00 0.15 0.00
30.00 1.00 0.15 0.00
32.00 1.00 0.15 0.00
34.00 1.00 0.15 0.00
36.00 1.00 0.15 0.00
38.00 1.00 0.15 0.00
40.00 1.00 0.15 0.00
42.00 1.00 0.15 0.00
44.00 1.00 0.15 0.00
46.00 1.00 0.15 0.00
48.00 1.00 0.15 0.00
50.00 1.00 0.15 0.00
52.00 1.00 0.15 0.00
54.00 1.00 0.15 0.00
56.00 1.00 0.15 0.00
58.00 1.00 0.15 0.00
60.00 1.00 0.15 0.00
62.00 1.00 0.15 0.00
64.00 1.00 0.15 0.00
66.00 1.00 0.15 0.00
68.00 1.00 0.15 0.00
70.00 1.00 0.15 0.00
72.00 1.00 0.15 0.00
74.00 1.00 0.15 0.00
76.00 1.00 0.15 0.00
78.00 1.00 0.15 0.00
80.00 1.00 0.15 0.00
82.00 1.00 0.15 0.00
84.00 1.00 0.15 0.00
86.00 1.00 0.15 0.00
88.00 1.00 0.15 0.00
90.00 1.00 0.15 0.00
92.00 1.00 0.15 0.00
94.00 1.00 0.15 0.00
96.00 1.00 0.15 0.00
98.00 1.00 0.15 0.00
100.00 1.00 0.15 0.00
102.00 1.00 0.15 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 16
Summary for Subcatchment PRE#3: Predevelopment #3
Runoff = 3.73 cfs @ 3.62 hrs, Volume= 0.354 af, Depth= 0.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 1-inch Rainfall=1.00"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#3: Predevelopment #3
Hydrograph
❑Runoff
3.73 cfs
j dhrlootte
I I I 1 Rainfall=1.1001"
3 Runoff Area=28.010 ad
Ryncff 1/9I9me=0. 51 �f
2 ; rt 1- fi l T ! L?irli:.!117-4111-57
Tc1.9 min
GIN-814
1 1 -
1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 17
Hydrograph for Subcatchment PRE#3: Predevelopment #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 1.00 0.15 0.00
2.00 0.11 0.00 0.00 106.00 1.00 0.15 0.00
4.00 0.88 0.10 2.23 108.00 1.00 0.15 0.00
6.00 1.00 0.15 0.53 110.00 1.00 0.15 0.00
8.00 1.00 0.15 0.00 112.00 1.00 0.15 0.00
10.00 1.00 0.15 0.00 114.00 1.00 0.15 0.00
12.00 1.00 0.15 0.00 116.00 1.00 0.15 0.00
14.00 1.00 0.15 0.00 118.00 1.00 0.15 0.00
16.00 1.00 0.15 0.00 120.00 1.00 0.15 0.00
18.00 1.00 0.15 0.00
20.00 1.00 0.15 0.00
22.00 1.00 0.15 0.00
24.00 1.00 0.15 0.00
26.00 1.00 0.15 0.00
28.00 1.00 0.15 0.00
30.00 1.00 0.15 0.00
32.00 1.00 0.15 0.00
34.00 1.00 0.15 0.00
36.00 1.00 0.15 0.00
38.00 1.00 0.15 0.00
40.00 1.00 0.15 0.00
42.00 1.00 0.15 0.00
44.00 1.00 0.15 0.00
46.00 1.00 0.15 0.00
48.00 1.00 0.15 0.00
50.00 1.00 0.15 0.00
52.00 1.00 0.15 0.00
54.00 1.00 0.15 0.00
56.00 1.00 0.15 0.00
58.00 1.00 0.15 0.00
60.00 1.00 0.15 0.00
62.00 1.00 0.15 0.00
64.00 1.00 0.15 0.00
66.00 1.00 0.15 0.00
68.00 1.00 0.15 0.00
70.00 1.00 0.15 0.00
72.00 1.00 0.15 0.00
74.00 1.00 0.15 0.00
76.00 1.00 0.15 0.00
78.00 1.00 0.15 0.00
80.00 1.00 0.15 0.00
82.00 1.00 0.15 0.00
84.00 1.00 0.15 0.00
86.00 1.00 0.15 0.00
88.00 1.00 0.15 0.00
90.00 1.00 0.15 0.00
92.00 1.00 0.15 0.00
94.00 1.00 0.15 0.00
96.00 1.00 0.15 0.00
98.00 1.00 0.15 0.00
100.00 1.00 0.15 0.00
102.00 1.00 0.15 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 18
Summary for Pond BMP#3: BMP #3
Inflow Area = 4.651 ac, 56.27% Impervious, Inflow Depth = 0.32" for 1-inch event
Inflow = 3.02 cfs @ 3.19 hrs, Volume= 0.124 of
Outflow = 0.08 cfs @ 3.10 hrs, Volume= 0.124 af, Atten= 97%, Lag= 0.0 min
Primary = 0.08 cfs @ 3.10 hrs, Volume= 0.124 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 550.84' @ 6.02 hrs Surf.Area= 6,027 sf Storage= 4,468 cf
Plug-Flow detention time= 507.8 min calculated for 0.124 af(100% of inflow)
Center-of-Mass det. time= 508.1 min ( 729.8 - 221.7 )
Volume Invert Avail.Storage Storage Description
#1 550.00' 95,966 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
550.00 4,583 0 0
551.00 6,298 5,441 5,441
552.00 8,187 7,243 12,683
553.00 10,158 9,173 21,856
554.00 12,069 11,114 32,969
555.00 13,858 12,964 45,933
556.00 15,706 14,782 60,715
557.00 17,611 16,659 77,373
558.00 19,575 18,593 95,966
Device Routing Invert Outlet Devices
#1 Primary 549.50' 24.0" Round RCP Round 24"
L= 85.0' RCP, square edge headwall, Ke= 0.500
Inlet/Outlet Invert= 549.50' / 548.96' S= 0.0064 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 550.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 553.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 2.00 2.00
#4 Device 1 554.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 556.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 19
Primary OutFlow Max=0.08 cfs @ 3.10 hrs HW=550.13' (Free Discharge)
=RCP_Round 24" (Passes 0.08 cfs of 1.95 cfs potential flow)
—2=Sand Filter (Custom Controls 0.08 cfs)
—3=Custom Weir/Orifice ( Controls 0.00 cfs)
—4=Riser ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=550.00' (Free Discharge)
5=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP#3: BMP #3
Hydrograph
3.02 cfs ❑Inflow
/ ❑Outflow
Inflow Area=4.651 ac ❑Primary
❑Secondary
I Peak Elev=550.84'
Storage=4,468 cf
w 2
3 /
0
LL
1
n nR
0.08 cfs0.00 cfs
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 20
Pond BMP#3: BMP #3
Stage-Discharge
❑Total '
558 ❑Primary
❑Secondary
557 /
/.� Broad-Crested Rectan.ular Weir
556
^ 555 ...d/
.2 /a�' Riser
0 554 '
�� Custom Weir/Orifice
III 553
%
552
551 / Sand Filter
/
0 10 20 30 40 50 60 70 80 90 100 110
Discharge (cfs)
Pond BMP#3: BMP #3
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 Surface
❑Storage
558_ I I 1 ��� �������
557 I ��� �� I I I
5561/
555� ��/�/
2 - ' II II I //' I I
o 554- , //�/ /� I 41 I
> -
w553LZ I 4 II 41 I -
552:/
5511/ 1
Custom Stage Data
550 ( ,
0 10,,000 20,000 30,000 40,000 50,000 60,,000 70,000 80,000 90,000'
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 21
Hydrograph for Pond BMP#3: BMP #3
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 550.00 0.00 0.00 0.00
5.00 0.17 4,270 550.81 0.08 0.08 0.00
10.00 0.00 3,334 550.65 0.08 0.08 0.00
15.00 0.00 1,876 550.38 0.08 0.08 0.00
20.00 0.00 418 550.09 0.08 0.08 0.00
25.00 0.00 0 550.00 0.00 0.00 0.00
30.00 0.00 0 550.00 0.00 0.00 0.00
35.00 0.00 0 550.00 0.00 0.00 0.00
40.00 0.00 0 550.00 0.00 0.00 0.00
45.00 0.00 0 550.00 0.00 0.00 0.00
50.00 0.00 0 550.00 0.00 0.00 0.00
55.00 0.00 0 550.00 0.00 0.00 0.00
60.00 0.00 0 550.00 0.00 0.00 0.00
65.00 0.00 0 550.00 0.00 0.00 0.00
70.00 0.00 0 550.00 0.00 0.00 0.00
75.00 0.00 0 550.00 0.00 0.00 0.00
80.00 0.00 0 550.00 0.00 0.00 0.00
85.00 0.00 0 550.00 0.00 0.00 0.00
90.00 0.00 0 550.00 0.00 0.00 0.00
95.00 0.00 0 550.00 0.00 0.00 0.00
100.00 0.00 0 550.00 0.00 0.00 0.00
105.00 0.00 0 550.00 0.00 0.00 0.00
110.00 0.00 0 550.00 0.00 0.00 0.00
115.00 0.00 0 550.00 0.00 0.00 0.00
120.00 0.00 0 550.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 22
Stage-Discharge for Pond BMP#3: BMP #3
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
550.00 0.00 0.00 0.00 555.20 32.45 32.45 0.00
550.10 0.08 0.08 0.00 555.30 32.83 32.83 0.00
550.20 0.08 0.08 0.00 555.40 33.21 33.21 0.00
550.30 0.08 0.08 0.00 555.50 33.58 33.58 0.00
550.40 0.08 0.08 0.00 555.60 33.95 33.95 0.00
550.50 0.08 0.08 0.00 555.70 34.31 34.31 0.00
550.60 0.08 0.08 0.00 555.80 34.67 34.67 0.00
550.70 0.08 0.08 0.00 555.90 35.03 35.03 0.00
550.80 0.08 0.08 0.00 556.00 35.38 35.38 0.00
550.90 0.08 0.08 0.00 556.10 36.58 35.73 0.85
551.00 0.08 0.08 0.00 556.20 38.47 36.07 2.40
551.10 0.08 0.08 0.00 556.30 40.84 36.42 4.42
551.20 0.08 0.08 0.00 556.40 43.57 36.74 6.83
551.30 0.08 0.08 0.00 556.50 46.60 37.05 9.55
551.40 0.08 0.08 0.00 556.60 49.91 37.36 12.55
551.50 0.08 0.08 0.00 556.70 53.30 37.67 15.64
551.60 0.08 0.08 0.00 556.80 56.86 37.97 18.89
551.70 0.08 0.08 0.00 556.90 60.77 38.27 22.50
551.80 0.08 0.08 0.00 557.00 64.87 38.57 26.30
551.90 0.08 0.08 0.00 557.10 69.26 38.86 30.40
552.00 0.08 0.08 0.00 557.20 73.86 39.15 34.70
552.10 0.08 0.08 0.00 557.30 78.58 39.45 39.13
552.20 0.08 0.08 0.00 557.40 83.47 39.73 43.73
552.30 0.08 0.08 0.00 557.50 88.43 40.02 48.41
552.40 0.08 0.08 0.00 557.60 93.53 40.31 53.23
552.50 0.08 0.08 0.00 557.70 98.88 40.59 58.29
552.60 0.08 0.08 0.00 557.80 104.38 40.87 63.51
552.70 0.08 0.08 0.00 557.90 110.03 41.15 68.88
552.80 0.08 0.08 0.00 558.00 115.81 41.43 74.39
552.90 0.08 0.08 0.00
553.00 0.08 0.08 0.00
553.10 0.29 0.29 0.00
553.20 0.67 0.67 0.00
553.30 1.16 1.16 0.00
553.40 1.74 1.74 0.00
553.50 2.40 2.40 0.00
553.60 3.13 3.13 0.00
553.70 3.92 3.92 0.00
553.80 4.77 4.77 0.00
553.90 5.67 5.67 0.00
554.00 6.63 6.63 0.00
554.10 9.09 9.09 0.00
554.20 12.78 12.78 0.00
554.30 17.31 17.31 0.00
554.40 22.51 22.51 0.00
554.50 28.30 28.30 0.00
554.60 30.07 30.07 0.00
554.70 30.48 30.48 0.00
554.80 30.88 30.88 0.00
554.90 31.28 31.28 0.00
555.00 31.68 31.68 0.00
555.10 32.06 32.06 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 23
Stage-Area-Storage for Pond BMP#3: BMP #3
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
550.00 4,583 0 555.20 14,228 48,741
550.10 4,755 467 555.30 14,412 50,173
550.20 4,926 951 555.40 14,597 51,624
550.30 5,097 1,452 555.50 14,782 53,093
550.40 5,269 1,970 555.60 14,967 54,580
550.50 5,441 2,506 555.70 15,152 56,086
550.60 5,612 3,059 555.80 15,336 57,610
550.70 5,784 3,628 555.90 15,521 59,153
550.80 5,955 4,215 556.00 15,706 60,715
550.90 6,126 4,819 556.10 15,897 62,295
551.00 6,298 5,441 556.20 16,087 63,894
551.10 6,487 6,080 556.30 16,277 65,512
551.20 6,676 6,738 556.40 16,468 67,149
551.30 6,865 7,415 556.50 16,659 68,806
551.40 7,054 8,111 556.60 16,849 70,481
551.50 7,243 8,826 556.70 17,040 72,175
551.60 7,431 9,559 556.80 17,230 73,889
551.70 7,620 10,312 556.90 17,420 75,621
551.80 7,809 11,083 557.00 17,611 77,373
551.90 7,998 11,874 557.10 17,807 79,144
552.00 8,187 12,683 557.20 18,004 80,934
552.10 8,384 13,512 557.30 18,200 82,745
552.20 8,581 14,360 557.40 18,397 84,575
552.30 8,778 15,228 557.50 18,593 86,424
552.40 8,975 16,115 557.60 18,789 88,293
552.50 9,173 17,023 557.70 18,986 90,182
552.60 9,370 17,950 557.80 19,182 92,090
552.70 9,567 18,897 557.90 19,379 94,018
552.80 9,764 19,863 558.00 19,575 95,966
552.90 9,961 20,850
553.00 10,158 21,856
553.10 10,349 22,881
553.20 10,540 23,925
553.30 10,731 24,989
553.40 10,922 26,072
553.50 11,114 27,173
553.60 11,305 28,294
553.70 11,496 29,434
553.80 11,687 30,593
553.90 11,878 31,772
554.00 12,069 32,969
554.10 12,248 34,185
554.20 12,427 35,419
554.30 12,606 36,670
554.40 12,785 37,940
554.50 12,964 39,227
554.60 13,142 40,532
554.70 13,321 41,856
554.80 13,500 43,197
554.90 13,679 44,556
555.00 13,858 45,933
555.10 14,043 47,328

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 24
Summary for Pond BMP-1: BMP #1
Inflow Area = 28.009 ac, 50.36% Impervious, Inflow Depth = 0.28" for 1-inch event
Inflow = 16.05 cfs @ 3.19 hrs, Volume= 0.665 af
Outflow = 0.35 cfs @ 6.06 hrs, Volume= 0.665 af, Atten= 98%, Lag= 172.5 min
Primary = 0.35 cfs @ 6.06 hrs, Volume= 0.665 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 556.20' @ 6.06 hrs Surf.Area= 38,277 sf Storage= 25,490 cf
Plug-Flow detention time= 882.5 min calculated for 0.665 af(100% of inflow)
Center-of-Mass det. time= 886.4 min ( 1,109.8 - 223.4 )
Volume Invert Avail.Storage Storage Description
#1 555.50' 223,972 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
555.50 34,578 0 0
556.00 37,559 18,034 18,034
557.00 41,209 39,384 57,418
558.00 44,809 43,009 100,427
559.00 48,473 46,641 147,068
560.00 52,204 50,339 197,407
560.50 54,057 26,565 223,972
Device Routing Invert Outlet Devices
#1 Primary 550.00' 36.0" Round RCP_Round 36"
L= 115.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 550.00' / 548.00' S= 0.0174 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 7.07 sf
#2 Device 1 555.50' 4.0" Horiz. WQ/CP Orifice C= 0.600
Limited to weir flow at low heads
#3 Device 1 557.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 2.00 2.00
#4 Device 1 557.50' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 559.00' 20.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 25
Primary OutFlow Max=0.35 cfs © 6.06 hrs HW=556.20' (Free Discharge)
L1=RCP_Round 36" (Passes 0.35 cfs of 73.76 cfs potential flow)
2=WQ/CP Orifice (Orifice Controls 0.35 cfs © 4.02 fps)
3=Custom Weir/Orifice ( Controls 0.00 cfs)
4=Riser ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=555.50' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-1: BMP #1
Hydrograph
/_ L I — I
;16.05 cfs ■ flow
�Q ❑Outflow
' l Fiifia ►v r =LV.����+91�/� ❑Se ondary
177 16 11 1 14 -Peakl €aeit=55h6.l�l� —
157
14II 4 -k -§t9-r -R_,'1'94 —
13;
12i / +— H -H E 1—IH I —
11
- 10
2 I— H 1 t H I � I—IH 1
3 _
8'� / I I I I
U - /
5� /
4 ' 1 1 1 1 7
3V� I n '�q, rf
2.I 0.35 cfs
0.00 cfs "'`'`"' O/%///O//////O//////O////
0-, "/// //
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 26
Pond BMP-1: BMP #1
Stage-Discharge
0 Total
0 Primary
❑Secondary
560
/�//
Broad-Crested Rectan.ular Weir �`
559 /
0 558 �
•; % j Riser
w / Custom Weir/Orifice
557
556 % WQ/CP Orifice
0 20 40 60 80 100 120 140 160 180
Discharge (cfs)
Pond BMP-1: BMP #1
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 0 Surfacel
❑Storage
560
///
///
559 z
///
0558 II
m
W II
557
- I I I
556-'
Custom Stage Data
0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 220,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 27
Hydrograph for Pond BMP-1: BMP #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 555.50 0.00 0.00 0.00
5.00 0.96 23,942 556.16 0.34 0.34 0.00
10.00 0.00 20,822 556.07 0.32 0.32 0.00
15.00 0.00 15,473 555.93 0.28 0.28 0.00
20.00 0.00 10,895 555.81 0.23 0.23 0.00
25.00 0.00 7,103 555.70 0.19 0.19 0.00
30.00 0.00 4,169 555.62 0.13 0.13 0.00
35.00 0.00 2,439 555.57 0.07 0.07 0.00
40.00 0.00 1,581 555.55 0.03 0.03 0.00
45.00 0.00 1,063 555.53 0.02 0.02 0.00
50.00 0.00 715 555.52 0.02 0.02 0.00
55.00 0.00 481 555.51 0.01 0.01 0.00
60.00 0.00 323 555.51 0.01 0.01 0.00
65.00 0.00 217 555.51 0.00 0.00 0.00
70.00 0.00 146 555.50 0.00 0.00 0.00
75.00 0.00 98 555.50 0.00 0.00 0.00
80.00 0.00 66 555.50 0.00 0.00 0.00
85.00 0.00 44 555.50 0.00 0.00 0.00
90.00 0.00 30 555.50 0.00 0.00 0.00
95.00 0.00 20 555.50 0.00 0.00 0.00
100.00 0.00 14 555.50 0.00 0.00 0.00
105.00 0.00 9 555.50 0.00 0.00 0.00
110.00 0.00 6 555.50 0.00 0.00 0.00
115.00 0.00 4 555.50 0.00 0.00 0.00
120.00 0.00 3 555.50 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 28
Stage-Discharge for Pond BMP-1: BMP #1
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
555.50 0.00 0.00 0.00 558.10 29.51 29.51 0.00
555.55 0.04 0.04 0.00 558.15 32.75 32.75 0.00
555.60 0.11 0.11 0.00 558.20 36.11 36.11 0.00
555.65 0.16 0.16 0.00 558.25 39.58 39.58 0.00
555.70 0.19 0.19 0.00 558.30 43.16 43.16 0.00
555.75 0.21 0.21 0.00 558.35 46.85 46.85 0.00
555.80 0.23 0.23 0.00 558.40 50.64 50.64 0.00
555.85 0.25 0.25 0.00 558.45 54.54 54.54 0.00
555.90 0.27 0.27 0.00 558.50 58.53 58.53 0.00
555.95 0.28 0.28 0.00 558.55 62.62 62.62 0.00
556.00 0.30 0.30 0.00 558.60 66.80 66.80 0.00
556.05 0.31 0.31 0.00 558.65 71.07 71.07 0.00
556.10 0.33 0.33 0.00 558.70 75.44 75.44 0.00
556.15 0.34 0.34 0.00 558.75 79.89 79.89 0.00
556.20 0.35 0.35 0.00 558.80 84.42 84.42 0.00
556.25 0.36 0.36 0.00 558.85 89.04 89.04 0.00
556.30 0.38 0.38 0.00 558.90 92.59 92.59 0.00
556.35 0.39 0.39 0.00 558.95 92.90 92.90 0.00
556.40 0.40 0.40 0.00 559.00 93.21 93.21 0.00
556.45 0.41 0.41 0.00 559.05 94.12 93.52 0.60
556.50 0.42 0.42 0.00 559.10 95.52 93.83 1.69
556.55 0.43 0.43 0.00 559.15 97.25 94.14 3.11
556.60 0.44 0.44 0.00 559.20 99.24 94.44 4.79
556.65 0.45 0.45 0.00 559.25 101.46 94.75 6.71
556.70 0.46 0.46 0.00 559.30 103.90 95.05 8.84
556.75 0.47 0.47 0.00 559.35 106.52 95.36 11.16
556.80 0.48 0.48 0.00 559.40 109.32 95.66 13.66
556.85 0.49 0.49 0.00 559.45 112.27 95.96 16.30
556.90 0.50 0.50 0.00 559.50 115.36 96.27 19.09
556.95 0.51 0.51 0.00 559.55 118.59 96.57 22.03
557.00 0.51 0.51 0.00 559.60 121.96 96.87 25.10
557.05 0.60 0.60 0.00 559.65 125.31 97.16 28.14
557.10 0.74 0.74 0.00 559.70 128.74 97.46 31.27
557.15 0.92 0.92 0.00 559.75 132.25 97.76 34.49
557.20 1.13 1.13 0.00 559.80 135.83 98.05 37.78
557.25 1.37 1.37 0.00 559.85 139.69 98.35 41.34
557.30 1.64 1.64 0.00 559.90 143.64 98.64 45.00
557.35 1.93 1.93 0.00 559.95 147.69 98.94 48.75
557.40 2.24 2.24 0.00 560.00 151.83 99.23 52.60
557.45 2.56 2.56 0.00 560.05 156.17 99.52 56.65
557.50 2.91 2.91 0.00 560.10 160.61 99.81 60.80
557.55 3.79 3.79 0.00 560.15 165.15 100.10 65.05
557.60 5.10 5.10 0.00 560.20 169.80 100.39 69.41
557.65 6.71 6.71 0.00 560.25 174.47 100.68 73.79
557.70 8.55 8.55 0.00 560.30 179.23 100.96 78.26
557.75 10.61 10.61 0.00 560.35 184.07 101.25 82.82
557.80 12.84 12.84 0.00 560.40 189.00 101.54 87.46
557.85 15.25 15.25 0.00 560.45 193.92 101.82 92.10
557.90 17.82 17.82 0.00 560.50 198.92 102.11 96.82
557.95 20.54 20.54 0.00
558.00 23.40 23.40 0.00
558.05 26.39 26.39 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 29
Stage-Area-Storage for Pond BMP-1: BMP #1
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
555.50 34,578 0 558.10 45,175 104,926
555.55 34,876 1,736 558.15 45,359 107,190
555.60 35,174 3,488 558.20 45,542 109,462
555.65 35,472 5,254 558.25 45,725 111,744
555.70 35,770 7,035 558.30 45,908 114,035
555.75 36,069 8,831 558.35 46,091 116,335
555.80 36,367 10,642 558.40 46,275 118,644
555.85 36,665 12,467 558.45 46,458 120,962
555.90 36,963 14,308 558.50 46,641 123,290
555.95 37,261 16,164 558.55 46,824 125,626
556.00 37,559 18,034 558.60 47,007 127,972
556.05 37,741 19,917 558.65 47,191 130,327
556.10 37,924 21,808 558.70 47,374 132,691
556.15 38,106 23,709 558.75 47,557 135,065
556.20 38,289 25,619 558.80 47,740 137,447
556.25 38,472 27,538 558.85 47,923 139,839
556.30 38,654 29,466 558.90 48,107 142,239
556.35 38,837 31,403 558.95 48,290 144,649
556.40 39,019 33,350 559.00 48,473 147,068
556.45 39,202 35,305 559.05 48,660 149,497
556.50 39,384 37,270 559.10 48,846 151,934
556.55 39,566 39,244 559.15 49,033 154,381
556.60 39,749 41,227 559.20 49,219 156,837
556.65 39,931 43,219 559.25 49,406 159,303
556.70 40,114 45,220 559.30 49,592 161,778
556.75 40,297 47,230 559.35 49,779 164,262
556.80 40,479 49,249 559.40 49,965 166,756
556.85 40,662 51,278 559.45 50,152 169,259
556.90 40,844 53,316 559.50 50,339 171,771
556.95 41,027 55,362 559.55 50,525 174,293
557.00 41,209 57,418 559.60 50,712 176,824
557.05 41,389 59,483 559.65 50,898 179,364
557.10 41,569 61,557 559.70 51,085 181,913
557.15 41,749 63,640 559.75 51,271 184,472
557.20 41,929 65,732 559.80 51,458 187,041
557.25 42,109 67,833 559.85 51,644 189,618
557.30 42,289 69,943 559.90 51,831 192,205
557.35 42,469 72,062 559.95 52,017 194,801
557.40 42,649 74,190 560.00 52,204 197,407
557.45 42,829 76,327 560.05 52,389 200,022
557.50 43,009 78,473 560.10 52,575 202,646
557.55 43,189 80,628 560.15 52,760 205,279
557.60 43,369 82,792 560.20 52,945 207,922
557.65 43,549 84,965 560.25 53,131 210,574
557.70 43,729 87,147 560.30 53,316 213,235
557.75 43,909 89,338 560.35 53,501 215,905
557.80 44,089 91,537 560.40 53,686 218,585
557.85 44,269 93,746 560.45 53,872 221,274
557.90 44,449 95,964 560.50 54,057 223,972
557.95 44,629 98,191
558.00 44,809 100,427
558.05 44,992 102,672

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 30
Summary for Pond BMP-2: BMP #2
Inflow Area = 6.846 ac, 45.49% Impervious, Inflow Depth = 0.25" for 1-inch event
Inflow = 3.45 cfs @ 3.19 hrs, Volume= 0.144 of
Outflow = 0.08 cfs @ 3.10 hrs, Volume= 0.144 af, Atten= 98%, Lag= 0.0 min
Primary = 0.08 cfs @ 3.10 hrs, Volume= 0.144 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 575.66' @ 6.06 hrs Surf.Area= 8,617 sf Storage= 5,364 cf
Plug-Flow detention time= 598.8 min calculated for 0.144 af(100% of inflow)
Center-of-Mass det. time= 599.3 min ( 824.5 - 225.2 )
Volume Invert Avail.Storage Storage Description
#1 575.00' 57,570 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
575.00 7,651 0 0
576.00 9,115 8,383 8,383
577.00 10,693 9,904 18,287
577.50 11,523 5,554 23,841
578.00 12,385 5,977 29,818
579.00 13,864 13,125 42,943
580.00 15,391 14,628 57,570
Device Routing Invert Outlet Devices
#1 Primary 574.40' 24.0" Round RCP Round 24"
L= 88.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 574.40' / 574.00' S= 0.0045 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 575.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 577.50' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 3.00 3.00
#4 Device 1 578.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 579.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 31
Primary OutFlow Max=0.08 cfs @ 3.10 hrs HW=575.07' (Free Discharge)
=RCP_Round 24" (Passes 0.08 cfs of 1.93 cfs potential flow)
—2=Sand Filter (Custom Controls 0.08 cfs)
—3=Custom Weir/Orifice ( Controls 0.00 cfs)
—4=Riser ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=575.00' (Free Discharge)
5=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-2: BMP #2
/� Hydrograph
/ I ❑Inflow
3.45 cfs ❑outflow
/ 1 1 1 Inflow Area=6.846 ac o se ondary
1 I 1 I 1 1 Peak Elev=575.66'
3 . 1 1 1 I I I I 1 1 Storage=5,364 cf
rt I 1
u_
�.. 2
I
fl (1Rrf
0.08 cfs j,///0.00 cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 32
Pond BMP-2: BMP #2
Stage-Discharge
❑Total
❑Primary
581
�'' ❑Secondary
580
Broad-Crested Rectangular Weir
579
Riser
0 578 Custom Weir/Orifice
w 577
576
Sand Filter /
0 10 20 30 40 50 60 70 80 90 100
Discharge (cfs)
Pond BMP-2: BMP #2
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 Surface
` . ( ❑Storage
581
580:/
i
579:/
I I
w 577� i ////���� II
576-
_ J J
Custom Stage Data
575 , , , , , , , ,
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 33
Hydrograph for Pond BMP-2: BMP #2
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 575.00 0.00 0.00 0.00
5.00 0.22 5,018 575.62 0.08 0.08 0.00
10.00 0.00 4,234 575.53 0.08 0.08 0.00
15.00 0.00 2,776 575.35 0.08 0.08 0.00
20.00 0.00 1,318 575.17 0.08 0.08 0.00
25.00 0.00 4 575.00 0.00 0.00 0.00
30.00 0.00 0 575.00 0.00 0.00 0.00
35.00 0.00 0 575.00 0.00 0.00 0.00
40.00 0.00 0 575.00 0.00 0.00 0.00
45.00 0.00 0 575.00 0.00 0.00 0.00
50.00 0.00 0 575.00 0.00 0.00 0.00
55.00 0.00 0 575.00 0.00 0.00 0.00
60.00 0.00 0 575.00 0.00 0.00 0.00
65.00 0.00 0 575.00 0.00 0.00 0.00
70.00 0.00 0 575.00 0.00 0.00 0.00
75.00 0.00 0 575.00 0.00 0.00 0.00
80.00 0.00 0 575.00 0.00 0.00 0.00
85.00 0.00 0 575.00 0.00 0.00 0.00
90.00 0.00 0 575.00 0.00 0.00 0.00
95.00 0.00 0 575.00 0.00 0.00 0.00
100.00 0.00 0 575.00 0.00 0.00 0.00
105.00 0.00 0 575.00 0.00 0.00 0.00
110.00 0.00 0 575.00 0.00 0.00 0.00
115.00 0.00 0 575.00 0.00 0.00 0.00
120.00 0.00 0 575.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 34
Stage-Discharge for Pond BMP-2: BMP #2
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
575.00 0.00 0.00 0.00 580.20 66.77 32.06 34.70
575.10 0.08 0.08 0.00 580.30 71.57 32.44 39.13
575.20 0.08 0.08 0.00 580.40 76.55 32.82 43.73
575.30 0.08 0.08 0.00 580.50 81.60 33.19 48.41
575.40 0.08 0.08 0.00 580.60 86.78 33.55 53.23
575.50 0.08 0.08 0.00 580.70 92.21 33.92 58.29
575.60 0.08 0.08 0.00 580.80 97.79 34.28 63.51
575.70 0.08 0.08 0.00 580.90 103.51 34.63 68.88
575.80 0.08 0.08 0.00 581.00 109.37 34.98 74.39
575.90 0.08 0.08 0.00
576.00 0.08 0.08 0.00
576.10 0.08 0.08 0.00
576.20 0.08 0.08 0.00
576.30 0.08 0.08 0.00
576.40 0.08 0.08 0.00
576.50 0.08 0.08 0.00
576.60 0.08 0.08 0.00
576.70 0.08 0.08 0.00
576.80 0.08 0.08 0.00
576.90 0.08 0.08 0.00
577.00 0.08 0.08 0.00
577.10 0.08 0.08 0.00
577.20 0.08 0.08 0.00
577.30 0.08 0.08 0.00
577.40 0.08 0.08 0.00
577.50 0.08 0.08 0.00
577.60 0.39 0.39 0.00
577.70 0.96 0.96 0.00
577.80 1.70 1.70 0.00
577.90 2.57 2.57 0.00
578.00 3.55 3.55 0.00
578.10 5.99 5.99 0.00
578.20 9.64 9.64 0.00
578.30 14.09 14.09 0.00
578.40 19.22 19.22 0.00
578.50 24.74 24.74 0.00
578.60 25.23 25.23 0.00
578.70 25.71 25.71 0.00
578.80 26.18 26.18 0.00
578.90 26.64 26.64 0.00
579.00 27.10 27.10 0.00
579.10 28.39 27.55 0.85
579.20 30.38 27.99 2.40
579.30 32.84 28.42 4.42
579.40 35.68 28.85 6.83
579.50 38.82 29.27 9.55
579.60 42.23 29.68 12.55
579.70 45.73 30.09 15.64
579.80 49.39 30.50 18.89
579.90 53.39 30.90 22.50
580.00 57.59 31.29 26.30
580.10 62.08 31.68 30.40

Detention
Davis Village Charlotte 6-hr 1-inch Rainfall=1.00"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 35
Stage-Area-Storage for Pond BMP-2: BMP #2
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
575.00 7,651 0 580.20 15,391 57,570
575.10 7,797 772 580.30 15,391 57,570
575.20 7,944 1,559 580.40 15,391 57,570
575.30 8,090 2,361 580.50 15,391 57,570
575.40 8,237 3,178 580.60 15,391 57,570
575.50 8,383 4,009 580.70 15,391 57,570
575.60 8,529 4,854 580.80 15,391 57,570
575.70 8,676 5,714 580.90 15,391 57,570
575.80 8,822 6,589 581.00 15,391 57,570
575.90 8,969 7,479
576.00 9,115 8,383
576.10 9,273 9,302
576.20 9,431 10,238
576.30 9,588 11,189
576.40 9,746 12,155
576.50 9,904 13,138
576.60 10,062 14,136
576.70 10,220 15,150
576.80 10,377 16,180
576.90 10,535 17,226
577.00 10,693 18,287
577.10 10,859 19,365
577.20 11,025 20,459
577.30 11,191 21,570
577.40 11,357 22,697
577.50 11,523 23,841
577.60 11,695 25,002
577.70 11,868 26,180
577.80 12,040 27,375
577.90 12,213 28,588
578.00 12,385 29,818
578.10 12,533 31,064
578.20 12,681 32,325
578.30 12,829 33,600
578.40 12,977 34,890
578.50 13,125 36,195
578.60 13,272 37,515
578.70 13,420 38,850
578.80 13,568 40,199
578.90 13,716 41,563
579.00 13,864 42,943
579.10 14,017 44,337
579.20 14,169 45,746
579.30 14,322 47,170
579.40 14,475 48,610
579.50 14,628 50,065
579.60 14,780 51,536
579.70 14,933 53,021
579.80 15,086 54,522
579.90 15,238 56,039
580.00 15,391 57,570
580.10 15,391 57,570

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 36
Time span=0.00-120.00 hrs, dt=0.10 hrs, 1201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
SubcatchmentDA#1: Post-Development Runoff Area=28.009 ac 50.36% Impervious Runoff Depth=1.91"
Tc=5.0 min CN=89 Runoff=83.39 cfs 4.455 af
Subcatchment DA#2: Post-Development Runoff Area=6.846 ac 45.49% Impervious Runoff Depth=1.83"
Tc=5.0 min CN=88 Runoff=19.64 cfs 1.042 of
Subcatchment DA#3: Post-Development Runoff Area=4.651 ac 56.27% Impervious Runoff Depth=1.99"
Tc=5.0 min CN=90 Runoff=14.35 cfs 0.773 af
Subcatchment PRE#1: Predevelopment#1 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=1.52"
Tc=29.5 min CN=84 Runoff=36.95 cfs 3.558 af
Subcatchment PRE#2: Predevelopment#2 Runoff Area=6.846 ac 0.00% Impervious Runoff Depth=1.52"
Tc=31.9 min CN=84 Runoff=8.54 cfs 0.870 af
SubcatchmentPRE#3: Predevelopment#3 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=1.52"
Tc=31.9 min CN=84 Runoff=34.95 cfs 3.558 af
Pond BMP#3: BMP#3 Peak Elev=553.13' Storage=23,180 cf Inflow=14.35 cfs 0.773 af
Primary=0.39 cfs 0.773 af Secondary=0.00 cfs 0.000 af Outflow=0.39 cfs 0.773 af
Pond BMP-1: BMP#1 Peak EIev=557.90' Storage=96,107 cf Inflow=83.39 cfs 4.455 af
Primary=19.66 cfs 4.454 af Secondary=0.00 cfs 0.000 af Outflow=19.66 cfs 4.454 af
Pond BMP-2: BMP#2 Peak Elev=577.73' Storage=26,542 cf Inflow=19.64 cfs 1.042 af
Primary=1.17 cfs 1.042 af Secondary=0.00 cfs 0.000 af Outflow=1.17 cfs 1.042 af
Total Runoff Area = 102.372 ac Runoff Volume = 14.257 af Average Runoff Depth = 1.67"
80.62% Pervious = 82.537 ac 19.38% Impervious = 19.835 ac

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment DA#1: Post-Development Pond #1
Runoff = 83.39 cfs @ 11.96 hrs, Volume= 4.455 af, Depth= 1.91"
Routed to Pond BMP-1 : BMP #1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 24-hr 1yr-24hr Rainfall=3.01"
Area (ac) CN Description
• 3.238 98 Roadway
• 1.043 98 Sidewalk
• 9.823 98 Buildings/Driveways
13.905 80 >75% Grass cover, Good, HSG D
28.009 89 Weighted Average
13.905 49.64% Pervious Area
14.104 50.36% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#1: Post-Development Pond #1
Hydrograph
1 I I I I i I
90 83.39 cfs ■Ruoff
85 I — — H H i ti;n1r -
80
75 H H H H 1 r1 ht�R� 3.10-11" -
70 Runoff /� 'Q /y/�
65 H L H H H Ar 028.QO9 —
55 LIM� I t e f
31.5 45 H T I H F ! -L!rictsff1 !'h71
.. _
- _ min
35
30 fi t rt � I �
25
15
10 + —
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 38
Hydrograph for Subcatchment DA#1: Post-Development Pond #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.01 1.91 0.00
2.00 0.07 0.00 0.00 106.00 3.01 1.91 0.00
4.00 0.14 0.00 0.00 108.00 3.01 1.91 0.00
6.00 0.24 0.00 0.00 110.00 3.01 1.91 0.00
8.00 0.36 0.01 0.29 112.00 3.01 1.91 0.00
10.00 0.54 0.06 1.13 114.00 3.01 1.91 0.00
12.00 2.00 1.02 77.62 116.00 3.01 1.91 0.00
14.00 2.47 1.43 2.86 118.00 3.01 1.91 0.00
16.00 2.65 1.59 1.77 120.00 3.01 1.91 0.00
18.00 2.77 1.70 1.38
20.00 2.87 1.78 1.01
22.00 2.94 1.85 0.92
24.00 3.01 1.91 0.83
26.00 3.01 1.91 0.00
28.00 3.01 1.91 0.00
30.00 3.01 1.91 0.00
32.00 3.01 1.91 0.00
34.00 3.01 1.91 0.00
36.00 3.01 1.91 0.00
38.00 3.01 1.91 0.00
40.00 3.01 1.91 0.00
42.00 3.01 1.91 0.00
44.00 3.01 1.91 0.00
46.00 3.01 1.91 0.00
48.00 3.01 1.91 0.00
50.00 3.01 1.91 0.00
52.00 3.01 1.91 0.00
54.00 3.01 1.91 0.00
56.00 3.01 1.91 0.00
58.00 3.01 1.91 0.00
60.00 3.01 1.91 0.00
62.00 3.01 1.91 0.00
64.00 3.01 1.91 0.00
66.00 3.01 1.91 0.00
68.00 3.01 1.91 0.00
70.00 3.01 1.91 0.00
72.00 3.01 1.91 0.00
74.00 3.01 1.91 0.00
76.00 3.01 1.91 0.00
78.00 3.01 1.91 0.00
80.00 3.01 1.91 0.00
82.00 3.01 1.91 0.00
84.00 3.01 1.91 0.00
86.00 3.01 1.91 0.00
88.00 3.01 1.91 0.00
90.00 3.01 1.91 0.00
92.00 3.01 1.91 0.00
94.00 3.01 1.91 0.00
96.00 3.01 1.91 0.00
98.00 3.01 1.91 0.00
100.00 3.01 1.91 0.00
102.00 3.01 1.91 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 39
Summary for Subcatchment DA#2: Post-Development Pond #2
Runoff = 19.64 cfs @ 11.96 hrs, Volume= 1.042 af, Depth= 1.83"
Routed to Pond BMP-2 : BMP #2
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 24-hr 1yr-24hr Rainfall=3.01"
Area (ac) CN Description
• 1.262 98 Roadway
• 0.445 98 Sidewalk
• 0.964 98 Buildings/Driveways
3.732 80 >75% Grass cover, Good, HSG D
• 0.443 98 Amenity Impervious
6.846 88 Weighted Average
3.732 54.51% Pervious Area
3.114 45.49% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#2: Post-Development Pond #2
Hydrograph
/ ■Runoff
21= 19.64 cfs
20 n�
19 — 13 11_2 tar _
18 — f- 1r122h Rililf II '3.0'11" _
�17 — —
16V
15t _ 1- I I t rt 1ROnbff-Awed-6.846�c
14_
3y I _[ � � ��Iume 1.Q4 f =
3 " nf 'I
5 10_ - ni-
.
n
7V
5
2=
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 40
Hydrograph for Subcatchment DA#2: Post-Development Pond #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.01 1.83 0.00
2.00 0.07 0.00 0.00 106.00 3.01 1.83 0.00
4.00 0.14 0.00 0.00 108.00 3.01 1.83 0.00
6.00 0.24 0.00 0.00 110.00 3.01 1.83 0.00
8.00 0.36 0.01 0.05 112.00 3.01 1.83 0.00
10.00 0.54 0.05 0.24 114.00 3.01 1.83 0.00
12.00 2.00 0.96 18.33 116.00 3.01 1.83 0.00
14.00 2.47 1.35 0.68 118.00 3.01 1.83 0.00
16.00 2.65 1.51 0.42 120.00 3.01 1.83 0.00
18.00 2.77 1.62 0.33
20.00 2.87 1.70 0.24
22.00 2.94 1.77 0.22
24.00 3.01 1.83 0.20
26.00 3.01 1.83 0.00
28.00 3.01 1.83 0.00
30.00 3.01 1.83 0.00
32.00 3.01 1.83 0.00
34.00 3.01 1.83 0.00
36.00 3.01 1.83 0.00
38.00 3.01 1.83 0.00
40.00 3.01 1.83 0.00
42.00 3.01 1.83 0.00
44.00 3.01 1.83 0.00
46.00 3.01 1.83 0.00
48.00 3.01 1.83 0.00
50.00 3.01 1.83 0.00
52.00 3.01 1.83 0.00
54.00 3.01 1.83 0.00
56.00 3.01 1.83 0.00
58.00 3.01 1.83 0.00
60.00 3.01 1.83 0.00
62.00 3.01 1.83 0.00
64.00 3.01 1.83 0.00
66.00 3.01 1.83 0.00
68.00 3.01 1.83 0.00
70.00 3.01 1.83 0.00
72.00 3.01 1.83 0.00
74.00 3.01 1.83 0.00
76.00 3.01 1.83 0.00
78.00 3.01 1.83 0.00
80.00 3.01 1.83 0.00
82.00 3.01 1.83 0.00
84.00 3.01 1.83 0.00
86.00 3.01 1.83 0.00
88.00 3.01 1.83 0.00
90.00 3.01 1.83 0.00
92.00 3.01 1.83 0.00
94.00 3.01 1.83 0.00
96.00 3.01 1.83 0.00
98.00 3.01 1.83 0.00
100.00 3.01 1.83 0.00
102.00 3.01 1.83 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 41
Summary for Subcatchment DA#3: Post-Development Pond #3
Runoff = 14.35 cfs @ 11.95 hrs, Volume= 0.773 af, Depth= 1.99"
Routed to Pond BMP#3 : BMP #3
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 24-hr 1yr-24hr Rainfall=3.01"
Area (ac) CN Description
• 0.677 98 Roadway
• 0.221 98 Sidewalk
• 1.481 98 Buildings/Driveways
2.034 80 >75% Grass cover, Good, HSG D
• 0.203 98 Parking
• 0.035 98 Ex. Impervious
4.651 90 Weighted Average
2.034 43.73% Pervious Area
2.617 56.27% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#3: Post-Development Pond #3
Hydrograph
16 ■Runoff
15=/ 14.35 cfs
H - H4HH + fop ii 4- r =
14=
13= H H H -
12
11 H 1RUIRtlinQfnf�� f VfAreea=4.651� mac
10_ r— O_f _e=0• f -
9/ L !Rt!nr Depth= .ri" _
3 8=
7 c=5. m i n
6/ 64
4/ I -
3=
2_
11/
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 42
Hydrograph for Subcatchment DA#3: Post-Development Pond #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.01 1.99 0.00
2.00 0.07 0.00 0.00 106.00 3.01 1.99 0.00
4.00 0.14 0.00 0.00 108.00 3.01 1.99 0.00
6.00 0.24 0.00 0.01 110.00 3.01 1.99 0.00
8.00 0.36 0.02 0.06 112.00 3.01 1.99 0.00
10.00 0.54 0.07 0.21 114.00 3.01 1.99 0.00
12.00 2.00 1.09 13.32 116.00 3.01 1.99 0.00
14.00 2.47 1.50 0.48 118.00 3.01 1.99 0.00
16.00 2.65 1.66 0.30 120.00 3.01 1.99 0.00
18.00 2.77 1.78 0.23
20.00 2.87 1.86 0.17
22.00 2.94 1.93 0.16
24.00 3.01 1.99 0.14
26.00 3.01 1.99 0.00
28.00 3.01 1.99 0.00
30.00 3.01 1.99 0.00
32.00 3.01 1.99 0.00
34.00 3.01 1.99 0.00
36.00 3.01 1.99 0.00
38.00 3.01 1.99 0.00
40.00 3.01 1.99 0.00
42.00 3.01 1.99 0.00
44.00 3.01 1.99 0.00
46.00 3.01 1.99 0.00
48.00 3.01 1.99 0.00
50.00 3.01 1.99 0.00
52.00 3.01 1.99 0.00
54.00 3.01 1.99 0.00
56.00 3.01 1.99 0.00
58.00 3.01 1.99 0.00
60.00 3.01 1.99 0.00
62.00 3.01 1.99 0.00
64.00 3.01 1.99 0.00
66.00 3.01 1.99 0.00
68.00 3.01 1.99 0.00
70.00 3.01 1.99 0.00
72.00 3.01 1.99 0.00
74.00 3.01 1.99 0.00
76.00 3.01 1.99 0.00
78.00 3.01 1.99 0.00
80.00 3.01 1.99 0.00
82.00 3.01 1.99 0.00
84.00 3.01 1.99 0.00
86.00 3.01 1.99 0.00
88.00 3.01 1.99 0.00
90.00 3.01 1.99 0.00
92.00 3.01 1.99 0.00
94.00 3.01 1.99 0.00
96.00 3.01 1.99 0.00
98.00 3.01 1.99 0.00
100.00 3.01 1.99 0.00
102.00 3.01 1.99 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 43
Summary for Subcatchment PRE#1: Predevelopment #1
Runoff = 36.95 cfs @ 12.24 hrs, Volume= 3.558 af, Depth= 1.52"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 24-hr 1yr-24hr Rainfall=3.01"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
29.5 Direct Entry,
Subcatchment PRE#1: Predevelopment #1
Hydrograph
40=/ — — -1 4 1— 1 - ■Runoff
38 36.9�cfs 4 4 f�1 Li 36 r -
34_! f— 1 r.24h 14ai if II -3.10'11" -
32
30V t —L Runoff Area#28.VO c
28�
24 - 1- - r IRIPIOrIVOTTle,346f
3 zoo ncff De . "
T min
16
14V - -
12 I J I_ 1 _H 1 1_ _1 -
10=/
s � - 14 I— I - in I �
6=
4= _I - I -
2
0 //,., �/ll�/ �/ �/g
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 44
Hydrograph for Subcatchment PRE#1: Predevelopment #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.01 1.52 0.00
2.00 0.07 0.00 0.00 106.00 3.01 1.52 0.00
4.00 0.14 0.00 0.00 108.00 3.01 1.52 0.00
6.00 0.24 0.00 0.00 110.00 3.01 1.52 0.00
8.00 0.36 0.00 0.00 112.00 3.01 1.52 0.00
10.00 0.54 0.01 0.32 114.00 3.01 1.52 0.00
12.00 2.00 0.74 16.54 116.00 3.01 1.52 0.00
14.00 2.47 1.09 3.04 118.00 3.01 1.52 0.00
16.00 2.65 1.23 1.75 120.00 3.01 1.52 0.00
18.00 2.77 1.33 1.30
20.00 2.87 1.41 0.97
22.00 2.94 1.47 0.85
24.00 3.01 1.52 0.78
26.00 3.01 1.52 0.00
28.00 3.01 1.52 0.00
30.00 3.01 1.52 0.00
32.00 3.01 1.52 0.00
34.00 3.01 1.52 0.00
36.00 3.01 1.52 0.00
38.00 3.01 1.52 0.00
40.00 3.01 1.52 0.00
42.00 3.01 1.52 0.00
44.00 3.01 1.52 0.00
46.00 3.01 1.52 0.00
48.00 3.01 1.52 0.00
50.00 3.01 1.52 0.00
52.00 3.01 1.52 0.00
54.00 3.01 1.52 0.00
56.00 3.01 1.52 0.00
58.00 3.01 1.52 0.00
60.00 3.01 1.52 0.00
62.00 3.01 1.52 0.00
64.00 3.01 1.52 0.00
66.00 3.01 1.52 0.00
68.00 3.01 1.52 0.00
70.00 3.01 1.52 0.00
72.00 3.01 1.52 0.00
74.00 3.01 1.52 0.00
76.00 3.01 1.52 0.00
78.00 3.01 1.52 0.00
80.00 3.01 1.52 0.00
82.00 3.01 1.52 0.00
84.00 3.01 1.52 0.00
86.00 3.01 1.52 0.00
88.00 3.01 1.52 0.00
90.00 3.01 1.52 0.00
92.00 3.01 1.52 0.00
94.00 3.01 1.52 0.00
96.00 3.01 1.52 0.00
98.00 3.01 1.52 0.00
100.00 3.01 1.52 0.00
102.00 3.01 1.52 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 45
Summary for Subcatchment PRE#2: Predevelopment #2
Runoff = 8.54 cfs @ 12.28 hrs, Volume= 0.870 af, Depth= 1.52"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 24-hr 1yr-24hr Rainfall=3.01"
Area (ac) CN Description
6.846 84 Pasture/grassland/range, Fair, HSG D
6.846 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#2: Predevelopment #2
Hydrograph
/ - ■Runoff
9_ 8.54 cfs
TypeLIl124 -h1-r
$_ 1 r12 h Rainf�II .b " _
7 IRUnbff Area=6.846 ab
fZLn9ff VfoIym1e=0.$79 �f
5_ / 1RuncTsffID-!Plh7-1-'1F1 _LL 4./ TIC= 1.9-m l n
31-/
2:/i
11,
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 46
Hydrograph for Subcatchment PRE#2: Predevelopment #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.01 1.52 0.00
2.00 0.07 0.00 0.00 106.00 3.01 1.52 0.00
4.00 0.14 0.00 0.00 108.00 3.01 1.52 0.00
6.00 0.24 0.00 0.00 110.00 3.01 1.52 0.00
8.00 0.36 0.00 0.00 112.00 3.01 1.52 0.00
10.00 0.54 0.01 0.07 114.00 3.01 1.52 0.00
12.00 2.00 0.74 3.49 116.00 3.01 1.52 0.00
14.00 2.47 1.09 0.76 118.00 3.01 1.52 0.00
16.00 2.65 1.23 0.43 120.00 3.01 1.52 0.00
18.00 2.77 1.33 0.32
20.00 2.87 1.41 0.24
22.00 2.94 1.47 0.21
24.00 3.01 1.52 0.19
26.00 3.01 1.52 0.00
28.00 3.01 1.52 0.00
30.00 3.01 1.52 0.00
32.00 3.01 1.52 0.00
34.00 3.01 1.52 0.00
36.00 3.01 1.52 0.00
38.00 3.01 1.52 0.00
40.00 3.01 1.52 0.00
42.00 3.01 1.52 0.00
44.00 3.01 1.52 0.00
46.00 3.01 1.52 0.00
48.00 3.01 1.52 0.00
50.00 3.01 1.52 0.00
52.00 3.01 1.52 0.00
54.00 3.01 1.52 0.00
56.00 3.01 1.52 0.00
58.00 3.01 1.52 0.00
60.00 3.01 1.52 0.00
62.00 3.01 1.52 0.00
64.00 3.01 1.52 0.00
66.00 3.01 1.52 0.00
68.00 3.01 1.52 0.00
70.00 3.01 1.52 0.00
72.00 3.01 1.52 0.00
74.00 3.01 1.52 0.00
76.00 3.01 1.52 0.00
78.00 3.01 1.52 0.00
80.00 3.01 1.52 0.00
82.00 3.01 1.52 0.00
84.00 3.01 1.52 0.00
86.00 3.01 1.52 0.00
88.00 3.01 1.52 0.00
90.00 3.01 1.52 0.00
92.00 3.01 1.52 0.00
94.00 3.01 1.52 0.00
96.00 3.01 1.52 0.00
98.00 3.01 1.52 0.00
100.00 3.01 1.52 0.00
102.00 3.01 1.52 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 47
Summary for Subcatchment PRE#3: Predevelopment #3
Runoff = 34.95 cfs @ 12.28 hrs, Volume= 3.558 af, Depth= 1.52"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 24-hr 1yr-24hr Rainfall=3.01"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#3: Predevelopment #3
Hydrograph
38� _ — � � •Runoff
;/I 34.95 cfs
36
3a� 4 1-r1It I& jr -
321 H 1 "" —
304/_ 1�yr 2h> R�r�fll3.
28 4 H H -+ Rufo-ff Are#28.O40 ab
26-
EY
244/L / H -1 H- I22 /
3 20 I_
I - H H- 1 4 !Rnr11)-! -hr'IF' —
0 18� / T-C 1 - min -
LL16�L jF HIS HI4 IH 4 diJ44
10=
8/ / ' I IHf IHH � I
6V
1//l((/(// //„f( f( f(/ f(/ f(/ /// //fff <f/lf/ ((/ f/t (/( (((
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 48
Hydrograph for Subcatchment PRE#3: Predevelopment #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.01 1.52 0.00
2.00 0.07 0.00 0.00 106.00 3.01 1.52 0.00
4.00 0.14 0.00 0.00 108.00 3.01 1.52 0.00
6.00 0.24 0.00 0.00 110.00 3.01 1.52 0.00
8.00 0.36 0.00 0.00 112.00 3.01 1.52 0.00
10.00 0.54 0.01 0.31 114.00 3.01 1.52 0.00
12.00 2.00 0.74 14.28 116.00 3.01 1.52 0.00
14.00 2.47 1.09 3.10 118.00 3.01 1.52 0.00
16.00 2.65 1.23 1.77 120.00 3.01 1.52 0.00
18.00 2.77 1.33 1.31
20.00 2.87 1.41 0.98
22.00 2.94 1.47 0.85
24.00 3.01 1.52 0.79
26.00 3.01 1.52 0.00
28.00 3.01 1.52 0.00
30.00 3.01 1.52 0.00
32.00 3.01 1.52 0.00
34.00 3.01 1.52 0.00
36.00 3.01 1.52 0.00
38.00 3.01 1.52 0.00
40.00 3.01 1.52 0.00
42.00 3.01 1.52 0.00
44.00 3.01 1.52 0.00
46.00 3.01 1.52 0.00
48.00 3.01 1.52 0.00
50.00 3.01 1.52 0.00
52.00 3.01 1.52 0.00
54.00 3.01 1.52 0.00
56.00 3.01 1.52 0.00
58.00 3.01 1.52 0.00
60.00 3.01 1.52 0.00
62.00 3.01 1.52 0.00
64.00 3.01 1.52 0.00
66.00 3.01 1.52 0.00
68.00 3.01 1.52 0.00
70.00 3.01 1.52 0.00
72.00 3.01 1.52 0.00
74.00 3.01 1.52 0.00
76.00 3.01 1.52 0.00
78.00 3.01 1.52 0.00
80.00 3.01 1.52 0.00
82.00 3.01 1.52 0.00
84.00 3.01 1.52 0.00
86.00 3.01 1.52 0.00
88.00 3.01 1.52 0.00
90.00 3.01 1.52 0.00
92.00 3.01 1.52 0.00
94.00 3.01 1.52 0.00
96.00 3.01 1.52 0.00
98.00 3.01 1.52 0.00
100.00 3.01 1.52 0.00
102.00 3.01 1.52 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 49
Summary for Pond BMP#3: BMP #3
Inflow Area = 4.651 ac, 56.27% Impervious, Inflow Depth = 1.99" for 1yr-24hr event
Inflow = 14.35 cfs @ 11.95 hrs, Volume= 0.773 af
Outflow = 0.39 cfs @ 14.99 hrs, Volume= 0.773 af, Atten= 97%, Lag= 182.0 min
Primary = 0.39 cfs @ 14.99 hrs, Volume= 0.773 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 553.13' @ 14.99 hrs Surf.Area= 10,404 sf Storage= 23,180 cf
Plug-Flow detention time= 1,995.9 min calculated for 0.772 af(100% of inflow)
Center-of-Mass det. time= 1,998.0 min ( 2,803.3 - 805.3 )
Volume Invert Avail.Storage Storage Description
#1 550.00' 95,966 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
550.00 4,583 0 0
551.00 6,298 5,441 5,441
552.00 8,187 7,243 12,683
553.00 10,158 9,173 21,856
554.00 12,069 11,114 32,969
555.00 13,858 12,964 45,933
556.00 15,706 14,782 60,715
557.00 17,611 16,659 77,373
558.00 19,575 18,593 95,966
Device Routing Invert Outlet Devices
#1 Primary 549.50' 24.0" Round RCP Round 24"
L= 85.0' RCP, square edge headwall, Ke= 0.500
Inlet/Outlet Invert= 549.50' / 548.96' S= 0.0064 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 550.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 553.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 2.00 2.00
#4 Device 1 554.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 556.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 50
Primary OutFlow Max=0.38 cfs © 14.99 hrs HW=553.13' (Free Discharge)
L1=RCP_Round 24" (Passes 0.38 cfs of 23.21 cfs potential flow)
2=Sand Filter (Custom Controls 0.08 cfs)
3=Custom Weir/Orifice (Weir Controls 0.30 cfs @ 1.18 fps)
4=Riser ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=550.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP#3: BMP #3
Hydrograph
T I T T T I T 1 1 1 1 T 1 - ■Inflow
/ 14.35 cfs `�-, N outflow
/ / - r 1 tbfioi iA� �6 7 1� — •Secondary
16=
15/ j / / I I ± Peak E� 5&3.it 3'
14� —
13/ / S4v�u I-8O-e
12� / z—
iliz
10.I/
91/ j z ]— 4 - 1 1
LL7_ L H —I I I -
6
5 / / 1 1 H1 L A A I 1 1
4z / ,� 7 i 7
i
3� J n 'AO rf
Y 2 / 0.39 cfs
0.00 cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 51
Pond BMP#3: BMP #3
Stage-Discharge
❑Total '
558 ❑Primary
❑Secondary
557 /
/.� Broad-Crested Rectan.ular Weir
556
^ 555 ...d/
.2 /a�' Riser
0 554 '
�III Custom Weir/Orifice
553 %
552
551 / Sand Filter
/
0 10 20 30 40 50 60 70 80 90 100 110
Discharge (cfs)
Pond BMP#3: BMP #3
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 Surface
❑Storage
558_ I I 1 ��� �������
557 I ��� �� I I I
5561/
555� ��/�/
2 - ' II II I //' I I
o 554- , //�/ /� I 41 I
> -
w553LZ I 4 II 41 I -
552:/
5511/ 1
Custom Stage Data
550 ( ,
0 10,,000 20,000 30,000 40,000 50,000 60,,000 70,000 80,000 90,000'
Storage(cubic-feet)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 52
Hydrograph for Pond BMP#3: BMP #3
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 550.00 0.00 0.00 0.00
5.00 0.00 0 550.00 0.00 0.00 0.00
10.00 0.21 394 550.08 0.08 0.08 0.00
15.00 0.39 23,180 553.13 0.39 0.39 0.00
20.00 0.17 22,526 553.07 0.20 0.20 0.00
25.00 0.00 21,942 553.01 0.09 0.09 0.00
30.00 0.00 20,479 552.86 0.08 0.08 0.00
35.00 0.00 19,021 552.71 0.08 0.08 0.00
40.00 0.00 17,563 552.56 0.08 0.08 0.00
45.00 0.00 16,105 552.40 0.08 0.08 0.00
50.00 0.00 14,647 552.23 0.08 0.08 0.00
55.00 0.00 13,189 552.06 0.08 0.08 0.00
60.00 0.00 11,731 551.88 0.08 0.08 0.00
65.00 0.00 10,273 551.69 0.08 0.08 0.00
70.00 0.00 8,815 551.50 0.08 0.08 0.00
75.00 0.00 7,357 551.29 0.08 0.08 0.00
80.00 0.00 5,899 551.07 0.08 0.08 0.00
85.00 0.00 4,441 550.84 0.08 0.08 0.00
90.00 0.00 2,983 550.59 0.08 0.08 0.00
95.00 0.00 1,525 550.31 0.08 0.08 0.00
100.00 0.00 67 550.01 0.08 0.08 0.00
105.00 0.00 0 550.00 0.00 0.00 0.00
110.00 0.00 0 550.00 0.00 0.00 0.00
115.00 0.00 0 550.00 0.00 0.00 0.00
120.00 0.00 0 550.00 0.00 0.00 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 53
Stage-Discharge for Pond BMP#3: BMP #3
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
550.00 0.00 0.00 0.00 555.20 32.45 32.45 0.00
550.10 0.08 0.08 0.00 555.30 32.83 32.83 0.00
550.20 0.08 0.08 0.00 555.40 33.21 33.21 0.00
550.30 0.08 0.08 0.00 555.50 33.58 33.58 0.00
550.40 0.08 0.08 0.00 555.60 33.95 33.95 0.00
550.50 0.08 0.08 0.00 555.70 34.31 34.31 0.00
550.60 0.08 0.08 0.00 555.80 34.67 34.67 0.00
550.70 0.08 0.08 0.00 555.90 35.03 35.03 0.00
550.80 0.08 0.08 0.00 556.00 35.38 35.38 0.00
550.90 0.08 0.08 0.00 556.10 36.58 35.73 0.85
551.00 0.08 0.08 0.00 556.20 38.47 36.07 2.40
551.10 0.08 0.08 0.00 556.30 40.84 36.42 4.42
551.20 0.08 0.08 0.00 556.40 43.57 36.74 6.83
551.30 0.08 0.08 0.00 556.50 46.60 37.05 9.55
551.40 0.08 0.08 0.00 556.60 49.91 37.36 12.55
551.50 0.08 0.08 0.00 556.70 53.30 37.67 15.64
551.60 0.08 0.08 0.00 556.80 56.86 37.97 18.89
551.70 0.08 0.08 0.00 556.90 60.77 38.27 22.50
551.80 0.08 0.08 0.00 557.00 64.87 38.57 26.30
551.90 0.08 0.08 0.00 557.10 69.26 38.86 30.40
552.00 0.08 0.08 0.00 557.20 73.86 39.15 34.70
552.10 0.08 0.08 0.00 557.30 78.58 39.45 39.13
552.20 0.08 0.08 0.00 557.40 83.47 39.73 43.73
552.30 0.08 0.08 0.00 557.50 88.43 40.02 48.41
552.40 0.08 0.08 0.00 557.60 93.53 40.31 53.23
552.50 0.08 0.08 0.00 557.70 98.88 40.59 58.29
552.60 0.08 0.08 0.00 557.80 104.38 40.87 63.51
552.70 0.08 0.08 0.00 557.90 110.03 41.15 68.88
552.80 0.08 0.08 0.00 558.00 115.81 41.43 74.39
552.90 0.08 0.08 0.00
553.00 0.08 0.08 0.00
553.10 0.29 0.29 0.00
553.20 0.67 0.67 0.00
553.30 1.16 1.16 0.00
553.40 1.74 1.74 0.00
553.50 2.40 2.40 0.00
553.60 3.13 3.13 0.00
553.70 3.92 3.92 0.00
553.80 4.77 4.77 0.00
553.90 5.67 5.67 0.00
554.00 6.63 6.63 0.00
554.10 9.09 9.09 0.00
554.20 12.78 12.78 0.00
554.30 17.31 17.31 0.00
554.40 22.51 22.51 0.00
554.50 28.30 28.30 0.00
554.60 30.07 30.07 0.00
554.70 30.48 30.48 0.00
554.80 30.88 30.88 0.00
554.90 31.28 31.28 0.00
555.00 31.68 31.68 0.00
555.10 32.06 32.06 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 54
Stage-Area-Storage for Pond BMP#3: BMP #3
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
550.00 4,583 0 555.20 14,228 48,741
550.10 4,755 467 555.30 14,412 50,173
550.20 4,926 951 555.40 14,597 51,624
550.30 5,097 1,452 555.50 14,782 53,093
550.40 5,269 1,970 555.60 14,967 54,580
550.50 5,441 2,506 555.70 15,152 56,086
550.60 5,612 3,059 555.80 15,336 57,610
550.70 5,784 3,628 555.90 15,521 59,153
550.80 5,955 4,215 556.00 15,706 60,715
550.90 6,126 4,819 556.10 15,897 62,295
551.00 6,298 5,441 556.20 16,087 63,894
551.10 6,487 6,080 556.30 16,277 65,512
551.20 6,676 6,738 556.40 16,468 67,149
551.30 6,865 7,415 556.50 16,659 68,806
551.40 7,054 8,111 556.60 16,849 70,481
551.50 7,243 8,826 556.70 17,040 72,175
551.60 7,431 9,559 556.80 17,230 73,889
551.70 7,620 10,312 556.90 17,420 75,621
551.80 7,809 11,083 557.00 17,611 77,373
551.90 7,998 11,874 557.10 17,807 79,144
552.00 8,187 12,683 557.20 18,004 80,934
552.10 8,384 13,512 557.30 18,200 82,745
552.20 8,581 14,360 557.40 18,397 84,575
552.30 8,778 15,228 557.50 18,593 86,424
552.40 8,975 16,115 557.60 18,789 88,293
552.50 9,173 17,023 557.70 18,986 90,182
552.60 9,370 17,950 557.80 19,182 92,090
552.70 9,567 18,897 557.90 19,379 94,018
552.80 9,764 19,863 558.00 19,575 95,966
552.90 9,961 20,850
553.00 10,158 21,856
553.10 10,349 22,881
553.20 10,540 23,925
553.30 10,731 24,989
553.40 10,922 26,072
553.50 11,114 27,173
553.60 11,305 28,294
553.70 11,496 29,434
553.80 11,687 30,593
553.90 11,878 31,772
554.00 12,069 32,969
554.10 12,248 34,185
554.20 12,427 35,419
554.30 12,606 36,670
554.40 12,785 37,940
554.50 12,964 39,227
554.60 13,142 40,532
554.70 13,321 41,856
554.80 13,500 43,197
554.90 13,679 44,556
555.00 13,858 45,933
555.10 14,043 47,328

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 55
Summary for Pond BMP-1: BMP #1
Inflow Area = 28.009 ac, 50.36% Impervious, Inflow Depth = 1.91" for 1yr-24hr event
Inflow = 83.39 cfs @ 11.96 hrs, Volume= 4.455 af
Outflow = 19.66 cfs @ 12.15 hrs, Volume= 4.454 af, Atten= 76%, Lag= 11.7 min
Primary = 19.66 cfs @ 12.15 hrs, Volume= 4.454 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 557.90' @ 12.10 hrs Surf.Area= 44,461 sf Storage= 96,107 cf
Plug-Flow detention time= 701.3 min calculated for 4.450 af(100% of inflow)
Center-of-Mass det. time= 704.8 min ( 1,514.4 - 809.5 )
Volume Invert Avail.Storage Storage Description
#1 555.50' 223,972 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
555.50 34,578 0 0
556.00 37,559 18,034 18,034
557.00 41,209 39,384 57,418
558.00 44,809 43,009 100,427
559.00 48,473 46,641 147,068
560.00 52,204 50,339 197,407
560.50 54,057 26,565 223,972
Device Routing Invert Outlet Devices
#1 Primary 550.00' 36.0" Round RCP_Round 36"
L= 115.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 550.00' / 548.00' S= 0.0174 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 7.07 sf
#2 Device 1 555.50' 4.0" Horiz. WQ/CP Orifice C= 0.600
Limited to weir flow at low heads
#3 Device 1 557.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 2.00 2.00
#4 Device 1 557.50' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 559.00' 20.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 56
Primary OutFlow Max=17.99 cfs © 12.15 hrs HW=557.90' (Free Discharge)
L1=RCP_Round 36" (Passes 17.99 cfs of 86.12 cfs potential flow)
2=WQ/CP Orifice (Orifice Controls 0.65 cfs © 7.46 fps)
3=Custom Weir/Orifice (Orifice Controls 3.95 cfs @ 3.95 fps)
4=Riser (Weir Controls 13.39 cfs © 2.08 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=555.50' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-1: BMP #1
Hydrograph
=_ 83.39 cfs
/ ICI � 4I � I
iPrimarY
i Outflow[ f AY6 =i8 o�9 � - ■Seond ary
90 85 > /— 1- I t -Pe cl€leii=557.1901'
80V z
65=� , � 1— —11 —I I —L I—I I -
60V
55t, 50_ / 4 4 1 —1 1 4 1-1 4 1 -
3 455/ /
LL 40_/ z I * —P H 4 1 + —1 H 14 1-1 4 1 -
J!I $ .
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 57
Pond BMP-1: BMP #1
Stage-Discharge
0 Total
0 Primary
❑Secondary
560
/�//
Broad-Crested Rectan.ular Weir �`
559 /
0 558 �
•; % j Riser
w / Custom Weir/Orifice
557
556 % WQ/CP Orifice
0 20 40 60 80 100 120 140 160 180
Discharge (cfs)
Pond BMP-1: BMP #1
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 0 Surfacel
❑Storage
560
///
///
559 z
///
0558 II
m
W II
557
- I I I
556-'
Custom Stage Data
0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 220,000
Storage(cubic-feet)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 58
Hydrograph for Pond BMP-1: BMP #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 555.50 0.00 0.00 0.00
5.00 0.00 0 555.50 0.00 0.00 0.00
10.00 1.13 4,998 555.64 0.15 0.15 0.00
15.00 2.28 78,090 557.49 2.85 2.85 0.00
20.00 1.01 68,348 557.26 1.44 1.44 0.00
25.00 0.00 61,643 557.10 0.75 0.75 0.00
30.00 0.00 51,867 556.86 0.49 0.49 0.00
35.00 0.00 43,386 556.65 0.45 0.45 0.00
40.00 0.00 35,621 556.46 0.41 0.41 0.00
45.00 0.00 28,585 556.28 0.37 0.37 0.00
50.00 0.00 22,291 556.11 0.33 0.33 0.00
55.00 0.00 16,750 555.97 0.29 0.29 0.00
60.00 0.00 11,976 555.84 0.24 0.24 0.00
65.00 0.00 7,984 555.73 0.20 0.20 0.00
70.00 0.00 4,799 555.64 0.15 0.15 0.00
75.00 0.00 2,769 555.58 0.08 0.08 0.00
80.00 0.00 1,748 555.55 0.04 0.04 0.00
85.00 0.00 1,175 555.53 0.03 0.03 0.00
90.00 0.00 790 555.52 0.02 0.02 0.00
95.00 0.00 531 555.52 0.01 0.01 0.00
100.00 0.00 357 555.51 0.01 0.01 0.00
105.00 0.00 240 555.51 0.01 0.01 0.00
110.00 0.00 162 555.50 0.00 0.00 0.00
115.00 0.00 109 555.50 0.00 0.00 0.00
120.00 0.00 73 555.50 0.00 0.00 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 59
Stage-Discharge for Pond BMP-1: BMP #1
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
555.50 0.00 0.00 0.00 558.10 29.51 29.51 0.00
555.55 0.04 0.04 0.00 558.15 32.75 32.75 0.00
555.60 0.11 0.11 0.00 558.20 36.11 36.11 0.00
555.65 0.16 0.16 0.00 558.25 39.58 39.58 0.00
555.70 0.19 0.19 0.00 558.30 43.16 43.16 0.00
555.75 0.21 0.21 0.00 558.35 46.85 46.85 0.00
555.80 0.23 0.23 0.00 558.40 50.64 50.64 0.00
555.85 0.25 0.25 0.00 558.45 54.54 54.54 0.00
555.90 0.27 0.27 0.00 558.50 58.53 58.53 0.00
555.95 0.28 0.28 0.00 558.55 62.62 62.62 0.00
556.00 0.30 0.30 0.00 558.60 66.80 66.80 0.00
556.05 0.31 0.31 0.00 558.65 71.07 71.07 0.00
556.10 0.33 0.33 0.00 558.70 75.44 75.44 0.00
556.15 0.34 0.34 0.00 558.75 79.89 79.89 0.00
556.20 0.35 0.35 0.00 558.80 84.42 84.42 0.00
556.25 0.36 0.36 0.00 558.85 89.04 89.04 0.00
556.30 0.38 0.38 0.00 558.90 92.59 92.59 0.00
556.35 0.39 0.39 0.00 558.95 92.90 92.90 0.00
556.40 0.40 0.40 0.00 559.00 93.21 93.21 0.00
556.45 0.41 0.41 0.00 559.05 94.12 93.52 0.60
556.50 0.42 0.42 0.00 559.10 95.52 93.83 1.69
556.55 0.43 0.43 0.00 559.15 97.25 94.14 3.11
556.60 0.44 0.44 0.00 559.20 99.24 94.44 4.79
556.65 0.45 0.45 0.00 559.25 101.46 94.75 6.71
556.70 0.46 0.46 0.00 559.30 103.90 95.05 8.84
556.75 0.47 0.47 0.00 559.35 106.52 95.36 11.16
556.80 0.48 0.48 0.00 559.40 109.32 95.66 13.66
556.85 0.49 0.49 0.00 559.45 112.27 95.96 16.30
556.90 0.50 0.50 0.00 559.50 115.36 96.27 19.09
556.95 0.51 0.51 0.00 559.55 118.59 96.57 22.03
557.00 0.51 0.51 0.00 559.60 121.96 96.87 25.10
557.05 0.60 0.60 0.00 559.65 125.31 97.16 28.14
557.10 0.74 0.74 0.00 559.70 128.74 97.46 31.27
557.15 0.92 0.92 0.00 559.75 132.25 97.76 34.49
557.20 1.13 1.13 0.00 559.80 135.83 98.05 37.78
557.25 1.37 1.37 0.00 559.85 139.69 98.35 41.34
557.30 1.64 1.64 0.00 559.90 143.64 98.64 45.00
557.35 1.93 1.93 0.00 559.95 147.69 98.94 48.75
557.40 2.24 2.24 0.00 560.00 151.83 99.23 52.60
557.45 2.56 2.56 0.00 560.05 156.17 99.52 56.65
557.50 2.91 2.91 0.00 560.10 160.61 99.81 60.80
557.55 3.79 3.79 0.00 560.15 165.15 100.10 65.05
557.60 5.10 5.10 0.00 560.20 169.80 100.39 69.41
557.65 6.71 6.71 0.00 560.25 174.47 100.68 73.79
557.70 8.55 8.55 0.00 560.30 179.23 100.96 78.26
557.75 10.61 10.61 0.00 560.35 184.07 101.25 82.82
557.80 12.84 12.84 0.00 560.40 189.00 101.54 87.46
557.85 15.25 15.25 0.00 560.45 193.92 101.82 92.10
557.90 17.82 17.82 0.00 560.50 198.92 102.11 96.82
557.95 20.54 20.54 0.00
558.00 23.40 23.40 0.00
558.05 26.39 26.39 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 60
Stage-Area-Storage for Pond BMP-1: BMP #1
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
555.50 34,578 0 558.10 45,175 104,926
555.55 34,876 1,736 558.15 45,359 107,190
555.60 35,174 3,488 558.20 45,542 109,462
555.65 35,472 5,254 558.25 45,725 111,744
555.70 35,770 7,035 558.30 45,908 114,035
555.75 36,069 8,831 558.35 46,091 116,335
555.80 36,367 10,642 558.40 46,275 118,644
555.85 36,665 12,467 558.45 46,458 120,962
555.90 36,963 14,308 558.50 46,641 123,290
555.95 37,261 16,164 558.55 46,824 125,626
556.00 37,559 18,034 558.60 47,007 127,972
556.05 37,741 19,917 558.65 47,191 130,327
556.10 37,924 21,808 558.70 47,374 132,691
556.15 38,106 23,709 558.75 47,557 135,065
556.20 38,289 25,619 558.80 47,740 137,447
556.25 38,472 27,538 558.85 47,923 139,839
556.30 38,654 29,466 558.90 48,107 142,239
556.35 38,837 31,403 558.95 48,290 144,649
556.40 39,019 33,350 559.00 48,473 147,068
556.45 39,202 35,305 559.05 48,660 149,497
556.50 39,384 37,270 559.10 48,846 151,934
556.55 39,566 39,244 559.15 49,033 154,381
556.60 39,749 41,227 559.20 49,219 156,837
556.65 39,931 43,219 559.25 49,406 159,303
556.70 40,114 45,220 559.30 49,592 161,778
556.75 40,297 47,230 559.35 49,779 164,262
556.80 40,479 49,249 559.40 49,965 166,756
556.85 40,662 51,278 559.45 50,152 169,259
556.90 40,844 53,316 559.50 50,339 171,771
556.95 41,027 55,362 559.55 50,525 174,293
557.00 41,209 57,418 559.60 50,712 176,824
557.05 41,389 59,483 559.65 50,898 179,364
557.10 41,569 61,557 559.70 51,085 181,913
557.15 41,749 63,640 559.75 51,271 184,472
557.20 41,929 65,732 559.80 51,458 187,041
557.25 42,109 67,833 559.85 51,644 189,618
557.30 42,289 69,943 559.90 51,831 192,205
557.35 42,469 72,062 559.95 52,017 194,801
557.40 42,649 74,190 560.00 52,204 197,407
557.45 42,829 76,327 560.05 52,389 200,022
557.50 43,009 78,473 560.10 52,575 202,646
557.55 43,189 80,628 560.15 52,760 205,279
557.60 43,369 82,792 560.20 52,945 207,922
557.65 43,549 84,965 560.25 53,131 210,574
557.70 43,729 87,147 560.30 53,316 213,235
557.75 43,909 89,338 560.35 53,501 215,905
557.80 44,089 91,537 560.40 53,686 218,585
557.85 44,269 93,746 560.45 53,872 221,274
557.90 44,449 95,964 560.50 54,057 223,972
557.95 44,629 98,191
558.00 44,809 100,427
558.05 44,992 102,672

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 61
Summary for Pond BMP-2: BMP #2
Inflow Area = 6.846 ac, 45.49% Impervious, Inflow Depth = 1.83" for 1yr-24hr event
Inflow = 19.64 cfs @ 11.96 hrs, Volume= 1.042 af
Outflow = 1.17 cfs @ 12.96 hrs, Volume= 1.042 af, Atten= 94%, Lag= 60.0 min
Primary = 1.17 cfs @ 12.96 hrs, Volume= 1.042 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 577.73' @ 12.96 hrs Surf.Area= 11,920 sf Storage= 26,542 cf
Plug-Flow detention time= 1,735.6 min calculated for 1.041 af(100% of inflow)
Center-of-Mass det. time= 1,738.3 min ( 2,551.9 - 813.6 )
Volume Invert Avail.Storage Storage Description
#1 575.00' 57,570 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
575.00 7,651 0 0
576.00 9,115 8,383 8,383
577.00 10,693 9,904 18,287
577.50 11,523 5,554 23,841
578.00 12,385 5,977 29,818
579.00 13,864 13,125 42,943
580.00 15,391 14,628 57,570
Device Routing Invert Outlet Devices
#1 Primary 574.40' 24.0" Round RCP Round 24"
L= 88.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 574.40' / 574.00' S= 0.0045 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 575.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 577.50' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 3.00 3.00
#4 Device 1 578.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 579.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 62
Primary OutFlow Max=1.17 cfs © 12.96 hrs HW=577.73' (Free Discharge)
L1=RCP_Round 24" (Passes 1.17 cfs of 20.58 cfs potential flow)
2=Sand Filter (Custom Controls 0.08 cfs)
3=Custom Weir/Orifice (Weir Controls 1.08 cfs @ 1.57 fps)
4=Riser ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=575.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-2: BMP #2
Hydrograph
— 11— —L ]— I I , •cfsr •Ow
/ 4Hr -
19.641 i 1 1 ii t iiI fl �� .646 1a - •Primary
Secondary
21 / z
20/ / /- 1 I 1 ]— 4 —I H- Peak �-�eVl=5717. 3' -
19/ / / -
18 / tot Z6�542icf -
17=7, /
15 / / /— 1 1 * —P 1— H + —I 1 —F 1 -
14 /
134 /
u 121/ / ; 1
LL 9� /
7 ! / I 1 1 1 1
647 -
5=' I I I
LW
17rf
3;/ 1.17 cfs ////�/
0.00 cfs ////////
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 63
Pond BMP-2: BMP #2
Stage-Discharge
❑Total
❑Primary
581
�'' ❑Secondary
580
Broad-Crested Rectangular Weir
579
Riser
0 578 Custom Weir/Orifice
w 577
576
Sand Filter /
0 10 20 30 40 50 60 70 80 90 100
Discharge (cfs)
Pond BMP-2: BMP #2
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 Surface
` . ( ❑Storage
581
580:-/
i
579:-/
I I
w 577� i ////���� II
576-
_ J J
Custom Stage Data
575 , , , , , , , ,
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000
Storage(cubic-feet)

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 64
Hydrograph for Pond BMP-2: BMP #2
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 575.00 0.00 0.00 0.00
5.00 0.00 0 575.00 0.00 0.00 0.00
10.00 0.24 450 575.06 0.08 0.08 0.00
15.00 0.55 25,542 577.65 0.63 0.63 0.00
20.00 0.24 24,681 577.57 0.28 0.28 0.00
25.00 0.00 23,977 577.51 0.10 0.10 0.00
30.00 0.00 22,507 577.38 0.08 0.08 0.00
35.00 0.00 21,049 577.25 0.08 0.08 0.00
40.00 0.00 19,591 577.12 0.08 0.08 0.00
45.00 0.00 18,133 576.99 0.08 0.08 0.00
50.00 0.00 16,675 576.85 0.08 0.08 0.00
55.00 0.00 15,217 576.71 0.08 0.08 0.00
60.00 0.00 13,759 576.56 0.08 0.08 0.00
65.00 0.00 12,301 576.41 0.08 0.08 0.00
70.00 0.00 10,843 576.26 0.08 0.08 0.00
75.00 0.00 9,385 576.11 0.08 0.08 0.00
80.00 0.00 7,927 575.95 0.08 0.08 0.00
85.00 0.00 6,469 575.79 0.08 0.08 0.00
90.00 0.00 5,011 575.62 0.08 0.08 0.00
95.00 0.00 3,553 575.45 0.08 0.08 0.00
100.00 0.00 2,095 575.27 0.08 0.08 0.00
105.00 0.00 637 575.08 0.08 0.08 0.00
110.00 0.00 0 575.00 0.00 0.00 0.00
115.00 0.00 0 575.00 0.00 0.00 0.00
120.00 0.00 0 575.00 0.00 0.00 0.00

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 65
Stage-Discharge for Pond BMP-2: BMP #2
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
575.00 0.00 0.00 0.00 580.20 66.77 32.06 34.70
575.10 0.08 0.08 0.00 580.30 71.57 32.44 39.13
575.20 0.08 0.08 0.00 580.40 76.55 32.82 43.73
575.30 0.08 0.08 0.00 580.50 81.60 33.19 48.41
575.40 0.08 0.08 0.00 580.60 86.78 33.55 53.23
575.50 0.08 0.08 0.00 580.70 92.21 33.92 58.29
575.60 0.08 0.08 0.00 580.80 97.79 34.28 63.51
575.70 0.08 0.08 0.00 580.90 103.51 34.63 68.88
575.80 0.08 0.08 0.00 581.00 109.37 34.98 74.39
575.90 0.08 0.08 0.00
576.00 0.08 0.08 0.00
576.10 0.08 0.08 0.00
576.20 0.08 0.08 0.00
576.30 0.08 0.08 0.00
576.40 0.08 0.08 0.00
576.50 0.08 0.08 0.00
576.60 0.08 0.08 0.00
576.70 0.08 0.08 0.00
576.80 0.08 0.08 0.00
576.90 0.08 0.08 0.00
577.00 0.08 0.08 0.00
577.10 0.08 0.08 0.00
577.20 0.08 0.08 0.00
577.30 0.08 0.08 0.00
577.40 0.08 0.08 0.00
577.50 0.08 0.08 0.00
577.60 0.39 0.39 0.00
577.70 0.96 0.96 0.00
577.80 1.70 1.70 0.00
577.90 2.57 2.57 0.00
578.00 3.55 3.55 0.00
578.10 5.99 5.99 0.00
578.20 9.64 9.64 0.00
578.30 14.09 14.09 0.00
578.40 19.22 19.22 0.00
578.50 24.74 24.74 0.00
578.60 25.23 25.23 0.00
578.70 25.71 25.71 0.00
578.80 26.18 26.18 0.00
578.90 26.64 26.64 0.00
579.00 27.10 27.10 0.00
579.10 28.39 27.55 0.85
579.20 30.38 27.99 2.40
579.30 32.84 28.42 4.42
579.40 35.68 28.85 6.83
579.50 38.82 29.27 9.55
579.60 42.23 29.68 12.55
579.70 45.73 30.09 15.64
579.80 49.39 30.50 18.89
579.90 53.39 30.90 22.50
580.00 57.59 31.29 26.30
580.10 62.08 31.68 30.40

Detention
Davis Village Type 1124-hr 1 yr-24hr Rainfall=3.01"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 66
Stage-Area-Storage for Pond BMP-2: BMP #2
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
575.00 7,651 0 580.20 15,391 57,570
575.10 7,797 772 580.30 15,391 57,570
575.20 7,944 1,559 580.40 15,391 57,570
575.30 8,090 2,361 580.50 15,391 57,570
575.40 8,237 3,178 580.60 15,391 57,570
575.50 8,383 4,009 580.70 15,391 57,570
575.60 8,529 4,854 580.80 15,391 57,570
575.70 8,676 5,714 580.90 15,391 57,570
575.80 8,822 6,589 581.00 15,391 57,570
575.90 8,969 7,479
576.00 9,115 8,383
576.10 9,273 9,302
576.20 9,431 10,238
576.30 9,588 11,189
576.40 9,746 12,155
576.50 9,904 13,138
576.60 10,062 14,136
576.70 10,220 15,150
576.80 10,377 16,180
576.90 10,535 17,226
577.00 10,693 18,287
577.10 10,859 19,365
577.20 11,025 20,459
577.30 11,191 21,570
577.40 11,357 22,697
577.50 11,523 23,841
577.60 11,695 25,002
577.70 11,868 26,180
577.80 12,040 27,375
577.90 12,213 28,588
578.00 12,385 29,818
578.10 12,533 31,064
578.20 12,681 32,325
578.30 12,829 33,600
578.40 12,977 34,890
578.50 13,125 36,195
578.60 13,272 37,515
578.70 13,420 38,850
578.80 13,568 40,199
578.90 13,716 41,563
579.00 13,864 42,943
579.10 14,017 44,337
579.20 14,169 45,746
579.30 14,322 47,170
579.40 14,475 48,610
579.50 14,628 50,065
579.60 14,780 51,536
579.70 14,933 53,021
579.80 15,086 54,522
579.90 15,238 56,039
580.00 15,391 57,570
580.10 15,391 57,570

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 67
Time span=0.00-120.00 hrs, dt=0.10 hrs, 1201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA#1: Post-Development Runoff Area=28.009 ac 50.36% Impervious Runoff Depth=2.59"
Tc=5.0 min CN=89 Runoff=125.71 cfs 6.043 af
Subcatchment DA#2: Post-Development Runoff Area=6.846 ac 45.49% Impervious Runoff Depth=2.50"
Tc=5.0 min CN=88 Runoff=29.82 cfs 1.425 af
Subcatchment DA#3: Post-Development Runoff Area=4.651 ac 56.27% Impervious Runoff Depth=2.68"
Tc=5.0 min CN=90 Runoff=21.65 cfs 1.040 af
Subcatchment PRE#1: Predevelopment#1 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=2.15"
Tc=29.5 min CN=84 Runoff=65.09 cfs 5.024 af
Subcatchment PRE#2: Predevelopment#2 Runoff Area=6.846 ac 0.00% Impervious Runoff Depth=2.15"
Tc=31.9 min CN=84 Runoff=15.29 cfs 1.228 af
SubcatchmentPRE#3: Predevelopment#3 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=2.15"
Tc=31.9 min CN=84 Runoff=62.57 cfs 5.024 af
Pond BMP#3: BMP#3 Peak Elev=553.71' Storage=29,551 cf Inflow=21.65 cfs 1.040 af
Primary=4.01 cfs 1.040 af Secondary=0.00 cfs 0.000 af Outflow=4.01 cfs 1.040 af
Pond BMP-1: BMP#1 Peak Elev=558.60' Storage=127,790 cf Inflow=125.71 cfs 6.043 af
Primary=66.30 cfs 6.043 af Secondary=0.00 cfs 0.000 af Outflow=66.30 cfs 6.043 af
Pond BMP-2: BMP#2 Peak Elev=578.27' Storage=33,203 cf Inflow=29.82 cfs 1.425 af
Primary=12.64 cfs 1.425 af Secondary=0.00 cfs 0.000 af Outflow=12.64 cfs 1.425 af
Total Runoff Area = 102.372 ac Runoff Volume = 19.783 af Average Runoff Depth = 2.32"
80.62% Pervious = 82.537 ac 19.38% Impervious = 19.835 ac

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 68
Summary for Subcatchment DA#1: Post-Development Pond #1
Runoff = 125.71 cfs @ 3.15 hrs, Volume= 6.043 af, Depth= 2.59"
Routed to Pond BMP-1 : BMP #1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Area (ac) CN Description
• 3.238 98 Roadway
• 1.043 98 Sidewalk
• 9.823 98 Buildings/Driveways
13.905 80 >75% Grass cover, Good, HSG D
28.009 89 Weighted Average
13.905 49.64% Pervious Area
14.104 50.36% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#1: Post-Development Pond #1
Hydrograph
140 ( 0 Runoff
125.71 cfs I
1207 611Larioite 6ir -�r
110_ 10-yr- hr-RainfalI=3J75"
100- Runoff Area=28.009 ad
90 ' Yrr9f fV91ul11e6n919
80• ,- 70— Ranc�ff p 7 P9"
o
:: i
C=50rn
40 I I
30
20
10-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 69
Hydrograph for Subcatchment DA#1: Post-Development Pond #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.75 2.59 0.00
2.00 0.39 0.02 1.60 106.00 3.75 2.59 0.00
4.00 3.32 2.19 12.54 108.00 3.75 2.59 0.00
6.00 3.75 2.59 3.46 110.00 3.75 2.59 0.00
8.00 3.75 2.59 0.00 112.00 3.75 2.59 0.00
10.00 3.75 2.59 0.00 114.00 3.75 2.59 0.00
12.00 3.75 2.59 0.00 116.00 3.75 2.59 0.00
14.00 3.75 2.59 0.00 118.00 3.75 2.59 0.00
16.00 3.75 2.59 0.00 120.00 3.75 2.59 0.00
18.00 3.75 2.59 0.00
20.00 3.75 2.59 0.00
22.00 3.75 2.59 0.00
24.00 3.75 2.59 0.00
26.00 3.75 2.59 0.00
28.00 3.75 2.59 0.00
30.00 3.75 2.59 0.00
32.00 3.75 2.59 0.00
34.00 3.75 2.59 0.00
36.00 3.75 2.59 0.00
38.00 3.75 2.59 0.00
40.00 3.75 2.59 0.00
42.00 3.75 2.59 0.00
44.00 3.75 2.59 0.00
46.00 3.75 2.59 0.00
48.00 3.75 2.59 0.00
50.00 3.75 2.59 0.00
52.00 3.75 2.59 0.00
54.00 3.75 2.59 0.00
56.00 3.75 2.59 0.00
58.00 3.75 2.59 0.00
60.00 3.75 2.59 0.00
62.00 3.75 2.59 0.00
64.00 3.75 2.59 0.00
66.00 3.75 2.59 0.00
68.00 3.75 2.59 0.00
70.00 3.75 2.59 0.00
72.00 3.75 2.59 0.00
74.00 3.75 2.59 0.00
76.00 3.75 2.59 0.00
78.00 3.75 2.59 0.00
80.00 3.75 2.59 0.00
82.00 3.75 2.59 0.00
84.00 3.75 2.59 0.00
86.00 3.75 2.59 0.00
88.00 3.75 2.59 0.00
90.00 3.75 2.59 0.00
92.00 3.75 2.59 0.00
94.00 3.75 2.59 0.00
96.00 3.75 2.59 0.00
98.00 3.75 2.59 0.00
100.00 3.75 2.59 0.00
102.00 3.75 2.59 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 70
Summary for Subcatchment DA#2: Post-Development Pond #2
Runoff = 29.82 cfs @ 3.15 hrs, Volume= 1.425 af, Depth= 2.50"
Routed to Pond BMP-2 : BMP #2
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Area (ac) CN Description
• 1.262 98 Roadway
• 0.445 98 Sidewalk
• 0.964 98 Buildings/Driveways
3.732 80 >75% Grass cover, Good, HSG D
• 0.443 98 Amenity Impervious
6.846 88 Weighted Average
3.732 54.51% Pervious Area
3.114 45.49% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#2: Post-Development Pond #2
Hydrograph
■Runoff
29.82 cfs
30 % 6 aTbite 6-hr-16 r -
26 I t I —[
24 4 I -4 4 tRUnbff-Area=6.846 at
22
20_ L I aRt.ToM 9me_.4-2 f
18
16 r rt r ! L1'19'-ff11:7131'72.P" =
- min
LL14= �5$
12 G'NL88
6 /
4 % j7 H
o
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 71
Hydrograph for Subcatchment DA#2: Post-Development Pond #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.75 2.50 0.00
2.00 0.39 0.01 0.29 106.00 3.75 2.50 0.00
4.00 3.32 2.10 3.02 108.00 3.75 2.50 0.00
6.00 3.75 2.50 0.84 110.00 3.75 2.50 0.00
8.00 3.75 2.50 0.00 112.00 3.75 2.50 0.00
10.00 3.75 2.50 0.00 114.00 3.75 2.50 0.00
12.00 3.75 2.50 0.00 116.00 3.75 2.50 0.00
14.00 3.75 2.50 0.00 118.00 3.75 2.50 0.00
16.00 3.75 2.50 0.00 120.00 3.75 2.50 0.00
18.00 3.75 2.50 0.00
20.00 3.75 2.50 0.00
22.00 3.75 2.50 0.00
24.00 3.75 2.50 0.00
26.00 3.75 2.50 0.00
28.00 3.75 2.50 0.00
30.00 3.75 2.50 0.00
32.00 3.75 2.50 0.00
34.00 3.75 2.50 0.00
36.00 3.75 2.50 0.00
38.00 3.75 2.50 0.00
40.00 3.75 2.50 0.00
42.00 3.75 2.50 0.00
44.00 3.75 2.50 0.00
46.00 3.75 2.50 0.00
48.00 3.75 2.50 0.00
50.00 3.75 2.50 0.00
52.00 3.75 2.50 0.00
54.00 3.75 2.50 0.00
56.00 3.75 2.50 0.00
58.00 3.75 2.50 0.00
60.00 3.75 2.50 0.00
62.00 3.75 2.50 0.00
64.00 3.75 2.50 0.00
66.00 3.75 2.50 0.00
68.00 3.75 2.50 0.00
70.00 3.75 2.50 0.00
72.00 3.75 2.50 0.00
74.00 3.75 2.50 0.00
76.00 3.75 2.50 0.00
78.00 3.75 2.50 0.00
80.00 3.75 2.50 0.00
82.00 3.75 2.50 0.00
84.00 3.75 2.50 0.00
86.00 3.75 2.50 0.00
88.00 3.75 2.50 0.00
90.00 3.75 2.50 0.00
92.00 3.75 2.50 0.00
94.00 3.75 2.50 0.00
96.00 3.75 2.50 0.00
98.00 3.75 2.50 0.00
100.00 3.75 2.50 0.00
102.00 3.75 2.50 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 72
Summary for Subcatchment DA#3: Post-Development Pond #3
Runoff = 21.65 cfs @ 3.15 hrs, Volume= 1.040 af, Depth= 2.68"
Routed to Pond BMP#3 : BMP #3
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Area (ac) CN Description
• 0.677 98 Roadway
• 0.221 98 Sidewalk
• 1.481 98 Buildings/Driveways
2.034 80 >75% Grass cover, Good, HSG D
• 0.203 98 Parking
• 0.035 98 Ex. Impervious
4.651 90 Weighted Average
2.034 43.73% Pervious Area
2.617 56.27% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#3: Post-Development Pond #3
Hydrograph
24 — — 1
21.65 cfs - ■Runoff
zz-
21 C-haloite 6 h r4 6-r —
20
19 1( r hRaiifII3.17- "
18
17 Runoff-Area=4.6�511 -arc -
'
16
15 1Rtff VIe1•Q4Q�f =
14
3 12
° 11 - c=5$ mmtm -
io
0 — I— 4 J4I �
6 �
5
3 I/
2 �
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 73
Hydrograph for Subcatchment DA#3: Post-Development Pond #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.75 2.68 0.00
2.00 0.39 0.02 0.34 106.00 3.75 2.68 0.00
4.00 3.32 2.28 2.11 108.00 3.75 2.68 0.00
6.00 3.75 2.68 0.58 110.00 3.75 2.68 0.00
8.00 3.75 2.68 0.00 112.00 3.75 2.68 0.00
10.00 3.75 2.68 0.00 114.00 3.75 2.68 0.00
12.00 3.75 2.68 0.00 116.00 3.75 2.68 0.00
14.00 3.75 2.68 0.00 118.00 3.75 2.68 0.00
16.00 3.75 2.68 0.00 120.00 3.75 2.68 0.00
18.00 3.75 2.68 0.00
20.00 3.75 2.68 0.00
22.00 3.75 2.68 0.00
24.00 3.75 2.68 0.00
26.00 3.75 2.68 0.00
28.00 3.75 2.68 0.00
30.00 3.75 2.68 0.00
32.00 3.75 2.68 0.00
34.00 3.75 2.68 0.00
36.00 3.75 2.68 0.00
38.00 3.75 2.68 0.00
40.00 3.75 2.68 0.00
42.00 3.75 2.68 0.00
44.00 3.75 2.68 0.00
46.00 3.75 2.68 0.00
48.00 3.75 2.68 0.00
50.00 3.75 2.68 0.00
52.00 3.75 2.68 0.00
54.00 3.75 2.68 0.00
56.00 3.75 2.68 0.00
58.00 3.75 2.68 0.00
60.00 3.75 2.68 0.00
62.00 3.75 2.68 0.00
64.00 3.75 2.68 0.00
66.00 3.75 2.68 0.00
68.00 3.75 2.68 0.00
70.00 3.75 2.68 0.00
72.00 3.75 2.68 0.00
74.00 3.75 2.68 0.00
76.00 3.75 2.68 0.00
78.00 3.75 2.68 0.00
80.00 3.75 2.68 0.00
82.00 3.75 2.68 0.00
84.00 3.75 2.68 0.00
86.00 3.75 2.68 0.00
88.00 3.75 2.68 0.00
90.00 3.75 2.68 0.00
92.00 3.75 2.68 0.00
94.00 3.75 2.68 0.00
96.00 3.75 2.68 0.00
98.00 3.75 2.68 0.00
100.00 3.75 2.68 0.00
102.00 3.75 2.68 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 74
Summary for Subcatchment PRE#1: Predevelopment #1
Runoff = 65.09 cfs @ 3.48 hrs, Volume= 5.024 af, Depth= 2.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
29.5 Direct Entry,
Subcatchment PRE#1: Predevelopment #1
Hydrograph
— ■Runoff
65.09 cfs
65 a lote6 r-6-r -
607 1 �161111.4ihl Ratlf 11 3.F7-51"
55-
50�,� T � ►rya ZB.O1O
45 — H HRunct V_14mle -5. f
41,
_3 35� / I T 71 T 1 7 7 !It!nr113-!Ihr'1151"
min -
LL30� IBC9 L
814
25� ""
20� —1 T 1 1- 7 1 T 1 � 1 �
15 — 14 — - I �
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 75
Hydrograph for Subcatchment PRE#1: Predevelopment #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.75 2.15 0.00
2.00 0.39 0.00 0.00 106.00 3.75 2.15 0.00
4.00 3.32 1.78 24.16 108.00 3.75 2.15 0.00
6.00 3.75 2.15 3.82 110.00 3.75 2.15 0.00
8.00 3.75 2.15 0.00 112.00 3.75 2.15 0.00
10.00 3.75 2.15 0.00 114.00 3.75 2.15 0.00
12.00 3.75 2.15 0.00 116.00 3.75 2.15 0.00
14.00 3.75 2.15 0.00 118.00 3.75 2.15 0.00
16.00 3.75 2.15 0.00 120.00 3.75 2.15 0.00
18.00 3.75 2.15 0.00
20.00 3.75 2.15 0.00
22.00 3.75 2.15 0.00
24.00 3.75 2.15 0.00
26.00 3.75 2.15 0.00
28.00 3.75 2.15 0.00
30.00 3.75 2.15 0.00
32.00 3.75 2.15 0.00
34.00 3.75 2.15 0.00
36.00 3.75 2.15 0.00
38.00 3.75 2.15 0.00
40.00 3.75 2.15 0.00
42.00 3.75 2.15 0.00
44.00 3.75 2.15 0.00
46.00 3.75 2.15 0.00
48.00 3.75 2.15 0.00
50.00 3.75 2.15 0.00
52.00 3.75 2.15 0.00
54.00 3.75 2.15 0.00
56.00 3.75 2.15 0.00
58.00 3.75 2.15 0.00
60.00 3.75 2.15 0.00
62.00 3.75 2.15 0.00
64.00 3.75 2.15 0.00
66.00 3.75 2.15 0.00
68.00 3.75 2.15 0.00
70.00 3.75 2.15 0.00
72.00 3.75 2.15 0.00
74.00 3.75 2.15 0.00
76.00 3.75 2.15 0.00
78.00 3.75 2.15 0.00
80.00 3.75 2.15 0.00
82.00 3.75 2.15 0.00
84.00 3.75 2.15 0.00
86.00 3.75 2.15 0.00
88.00 3.75 2.15 0.00
90.00 3.75 2.15 0.00
92.00 3.75 2.15 0.00
94.00 3.75 2.15 0.00
96.00 3.75 2.15 0.00
98.00 3.75 2.15 0.00
100.00 3.75 2.15 0.00
102.00 3.75 2.15 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 76
Summary for Subcatchment PRE#2: Predevelopment #2
Runoff = 15.29 cfs @ 3.52 hrs, Volume= 1.228 af, Depth= 2.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Area (ac) CN Description
6.846 84 Pasture/grassland/range, Fair, HSG D
6.846 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#2: Predevelopment #2
Hydrograph
17 (I ■Runoff
15.29 cfs _ I ± T � -
15= 6._tarloite 6 rt6-r
13T -k 1 - 1 Ell r4ihi-kaliif II 3.F7- "51 -
12V T 1 T T 1 T R u noffAI ea 5.846 a
114-/
10V T T T T 1 RLn�V ILle -1•?2 f -
T T I HRnr I�!p hr'11�'
8- T-c- - nun —
LL H4 — I -I T -1 4 1- IT 1 1 aNL-814
4= _
3= T T T TI T1 TT
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 77
Hydrograph for Subcatchment PRE#2: Predevelopment #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.75 2.15 0.00
2.00 0.39 0.00 0.00 106.00 3.75 2.15 0.00
4.00 3.32 1.78 6.44 108.00 3.75 2.15 0.00
6.00 3.75 2.15 0.95 110.00 3.75 2.15 0.00
8.00 3.75 2.15 0.00 112.00 3.75 2.15 0.00
10.00 3.75 2.15 0.00 114.00 3.75 2.15 0.00
12.00 3.75 2.15 0.00 116.00 3.75 2.15 0.00
14.00 3.75 2.15 0.00 118.00 3.75 2.15 0.00
16.00 3.75 2.15 0.00 120.00 3.75 2.15 0.00
18.00 3.75 2.15 0.00
20.00 3.75 2.15 0.00
22.00 3.75 2.15 0.00
24.00 3.75 2.15 0.00
26.00 3.75 2.15 0.00
28.00 3.75 2.15 0.00
30.00 3.75 2.15 0.00
32.00 3.75 2.15 0.00
34.00 3.75 2.15 0.00
36.00 3.75 2.15 0.00
38.00 3.75 2.15 0.00
40.00 3.75 2.15 0.00
42.00 3.75 2.15 0.00
44.00 3.75 2.15 0.00
46.00 3.75 2.15 0.00
48.00 3.75 2.15 0.00
50.00 3.75 2.15 0.00
52.00 3.75 2.15 0.00
54.00 3.75 2.15 0.00
56.00 3.75 2.15 0.00
58.00 3.75 2.15 0.00
60.00 3.75 2.15 0.00
62.00 3.75 2.15 0.00
64.00 3.75 2.15 0.00
66.00 3.75 2.15 0.00
68.00 3.75 2.15 0.00
70.00 3.75 2.15 0.00
72.00 3.75 2.15 0.00
74.00 3.75 2.15 0.00
76.00 3.75 2.15 0.00
78.00 3.75 2.15 0.00
80.00 3.75 2.15 0.00
82.00 3.75 2.15 0.00
84.00 3.75 2.15 0.00
86.00 3.75 2.15 0.00
88.00 3.75 2.15 0.00
90.00 3.75 2.15 0.00
92.00 3.75 2.15 0.00
94.00 3.75 2.15 0.00
96.00 3.75 2.15 0.00
98.00 3.75 2.15 0.00
100.00 3.75 2.15 0.00
102.00 3.75 2.15 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 78
Summary for Subcatchment PRE#3: Predevelopment #3
Runoff = 62.57 cfs @ 3.52 hrs, Volume= 5.024 af, Depth= 2.15"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#3: Predevelopment #3
Hydrograph
70 _ •Runoff
62.57 cfs I ' A - Crar1Coi el 6=ihrli C -- r -
60
55 r irt1 p�y.{11.4. rA Ra i i1611 �/.�F7V.�
501/ L I A_ �7►�1�ho__ 1 Are_a#28.01W a +
45�
40 -/ - fi V 14 1e�'• f
0 35 , nrI la! 7-2•I I
LT 30- TCi= 1 m i n
f- � IIG-NLf314
25 ,
20-?
10-
0 5 10 15 20�/1����/��//l�//l��l��l 25 30 35 40 45 50�/ 55 60 65 70 75 80 85 9'0 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 79
Hydrograph for Subcatchment PRE#3: Predevelopment #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 3.75 2.15 0.00
2.00 0.39 0.00 0.00 106.00 3.75 2.15 0.00
4.00 3.32 1.78 26.35 108.00 3.75 2.15 0.00
6.00 3.75 2.15 3.87 110.00 3.75 2.15 0.00
8.00 3.75 2.15 0.00 112.00 3.75 2.15 0.00
10.00 3.75 2.15 0.00 114.00 3.75 2.15 0.00
12.00 3.75 2.15 0.00 116.00 3.75 2.15 0.00
14.00 3.75 2.15 0.00 118.00 3.75 2.15 0.00
16.00 3.75 2.15 0.00 120.00 3.75 2.15 0.00
18.00 3.75 2.15 0.00
20.00 3.75 2.15 0.00
22.00 3.75 2.15 0.00
24.00 3.75 2.15 0.00
26.00 3.75 2.15 0.00
28.00 3.75 2.15 0.00
30.00 3.75 2.15 0.00
32.00 3.75 2.15 0.00
34.00 3.75 2.15 0.00
36.00 3.75 2.15 0.00
38.00 3.75 2.15 0.00
40.00 3.75 2.15 0.00
42.00 3.75 2.15 0.00
44.00 3.75 2.15 0.00
46.00 3.75 2.15 0.00
48.00 3.75 2.15 0.00
50.00 3.75 2.15 0.00
52.00 3.75 2.15 0.00
54.00 3.75 2.15 0.00
56.00 3.75 2.15 0.00
58.00 3.75 2.15 0.00
60.00 3.75 2.15 0.00
62.00 3.75 2.15 0.00
64.00 3.75 2.15 0.00
66.00 3.75 2.15 0.00
68.00 3.75 2.15 0.00
70.00 3.75 2.15 0.00
72.00 3.75 2.15 0.00
74.00 3.75 2.15 0.00
76.00 3.75 2.15 0.00
78.00 3.75 2.15 0.00
80.00 3.75 2.15 0.00
82.00 3.75 2.15 0.00
84.00 3.75 2.15 0.00
86.00 3.75 2.15 0.00
88.00 3.75 2.15 0.00
90.00 3.75 2.15 0.00
92.00 3.75 2.15 0.00
94.00 3.75 2.15 0.00
96.00 3.75 2.15 0.00
98.00 3.75 2.15 0.00
100.00 3.75 2.15 0.00
102.00 3.75 2.15 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 80
Summary for Pond BMP#3: BMP #3
Inflow Area = 4.651 ac, 56.27% Impervious, Inflow Depth = 2.68" for 10-yr-6hr event
Inflow = 21.65 cfs @ 3.15 hrs, Volume= 1.040 of
Outflow = 4.01 cfs @ 3.60 hrs, Volume= 1.040 af, Atten= 81%, Lag= 27.1 min
Primary = 4.01 cfs @ 3.60 hrs, Volume= 1.040 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 553.71' @ 3.60 hrs Surf.Area= 11,515 sf Storage= 29,551 cf
Plug-Flow detention time= 1,268.9 min calculated for 1.039 af(100% of inflow)
Center-of-Mass det. time= 1,271.7 min ( 1,478.0 - 206.3 )
Volume Invert Avail.Storage Storage Description
#1 550.00' 95,966 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
550.00 4,583 0 0
551.00 6,298 5,441 5,441
552.00 8,187 7,243 12,683
553.00 10,158 9,173 21,856
554.00 12,069 11,114 32,969
555.00 13,858 12,964 45,933
556.00 15,706 14,782 60,715
557.00 17,611 16,659 77,373
558.00 19,575 18,593 95,966
Device Routing Invert Outlet Devices
#1 Primary 549.50' 24.0" Round RCP Round 24"
L= 85.0' RCP, square edge headwall, Ke= 0.500
Inlet/Outlet Invert= 549.50' / 548.96' S= 0.0064 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 550.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 553.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 2.00 2.00
#4 Device 1 554.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 556.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 81
Primary OutFlow Max=4.00 cfs © 3.60 hrs HW=553.71' (Free Discharge)
4-1=RCP_Round 24" (Passes 4.00 cfs of 26.13 cfs potential flow)
2=Sand Filter (Custom Controls 0.08 cfs)
3=Custom Weir/Orifice (Weir Controls 3.92 cfs @ 2.76 fps)
4=Riser ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=550.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP#3: BMP #3
Hydrograph
A H— r 7 I I T I A r 17 1 ■Inflow
21.65 cfs LA,-,1A/� - ■outflow
24 / I`if`�e�v �e��A 1 lad ■Secondary
227:- ± Peak El Vi=553.1 v -
20� Storage=2%5511 cf
18-
16Y - 14 1—14 1 -
in' 14= TTTI7F17I -
/
0
: / L �
a 104 / yy
84 d f11 rfk 1 1 H 1 1-1 rt l
4.01 cfs
4 ,j Z / ,// ZZis
0.00 cfs %///////////////////////////////////////////////////////�������������
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 82
Pond BMP#3: BMP #3
Stage-Discharge
❑Total '
558 ❑Primary
❑Secondary
557 /
/.� Broad-Crested Rectan.ular Weir
556
^ 555 ...d/
.2 /a�' Riser
0 554 '
�III Custom Weir/Orifice
553 %
552
551 / Sand Filter
/
0 10 20 30 40 50 60 70 80 90 100 110
Discharge (cfs)
Pond BMP#3: BMP #3
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 Surface
❑Storage
558_ I I 1 ��� �������
557 I ��� �� I I I
5561/
555� ��/�/ —
2 - ' II II I //' — I I
o 554- , //�/ /� I 41 I
> -
w 553LZ I 4 I I 4I I -
552:/
5511/ 1
Custom Stage Data
550 ( ,
0 10,,000 20,000 30,000 40,000 50,000 60,,000 70,000 80,000 90,000'
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 83
Hydrograph for Pond BMP#3: BMP #3
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 550.00 0.00 0.00 0.00
5.00 0.86 25,372 553.34 1.36 1.36 0.00
10.00 0.00 21,488 552.96 0.08 0.08 0.00
15.00 0.00 20,030 552.82 0.08 0.08 0.00
20.00 0.00 18,572 552.67 0.08 0.08 0.00
25.00 0.00 17,114 552.51 0.08 0.08 0.00
30.00 0.00 15,656 552.35 0.08 0.08 0.00
35.00 0.00 14,198 552.18 0.08 0.08 0.00
40.00 0.00 12,740 552.01 0.08 0.08 0.00
45.00 0.00 11,282 551.83 0.08 0.08 0.00
50.00 0.00 9,824 551.64 0.08 0.08 0.00
55.00 0.00 8,366 551.44 0.08 0.08 0.00
60.00 0.00 6,908 551.23 0.08 0.08 0.00
65.00 0.00 5,450 551.00 0.08 0.08 0.00
70.00 0.00 3,992 550.76 0.08 0.08 0.00
75.00 0.00 2,534 550.51 0.08 0.08 0.00
80.00 0.00 1,076 550.23 0.08 0.08 0.00
85.00 0.00 0 550.00 0.00 0.00 0.00
90.00 0.00 0 550.00 0.00 0.00 0.00
95.00 0.00 0 550.00 0.00 0.00 0.00
100.00 0.00 0 550.00 0.00 0.00 0.00
105.00 0.00 0 550.00 0.00 0.00 0.00
110.00 0.00 0 550.00 0.00 0.00 0.00
115.00 0.00 0 550.00 0.00 0.00 0.00
120.00 0.00 0 550.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 84
Stage-Discharge for Pond BMP#3: BMP #3
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
550.00 0.00 0.00 0.00 555.20 32.45 32.45 0.00
550.10 0.08 0.08 0.00 555.30 32.83 32.83 0.00
550.20 0.08 0.08 0.00 555.40 33.21 33.21 0.00
550.30 0.08 0.08 0.00 555.50 33.58 33.58 0.00
550.40 0.08 0.08 0.00 555.60 33.95 33.95 0.00
550.50 0.08 0.08 0.00 555.70 34.31 34.31 0.00
550.60 0.08 0.08 0.00 555.80 34.67 34.67 0.00
550.70 0.08 0.08 0.00 555.90 35.03 35.03 0.00
550.80 0.08 0.08 0.00 556.00 35.38 35.38 0.00
550.90 0.08 0.08 0.00 556.10 36.58 35.73 0.85
551.00 0.08 0.08 0.00 556.20 38.47 36.07 2.40
551.10 0.08 0.08 0.00 556.30 40.84 36.42 4.42
551.20 0.08 0.08 0.00 556.40 43.57 36.74 6.83
551.30 0.08 0.08 0.00 556.50 46.60 37.05 9.55
551.40 0.08 0.08 0.00 556.60 49.91 37.36 12.55
551.50 0.08 0.08 0.00 556.70 53.30 37.67 15.64
551.60 0.08 0.08 0.00 556.80 56.86 37.97 18.89
551.70 0.08 0.08 0.00 556.90 60.77 38.27 22.50
551.80 0.08 0.08 0.00 557.00 64.87 38.57 26.30
551.90 0.08 0.08 0.00 557.10 69.26 38.86 30.40
552.00 0.08 0.08 0.00 557.20 73.86 39.15 34.70
552.10 0.08 0.08 0.00 557.30 78.58 39.45 39.13
552.20 0.08 0.08 0.00 557.40 83.47 39.73 43.73
552.30 0.08 0.08 0.00 557.50 88.43 40.02 48.41
552.40 0.08 0.08 0.00 557.60 93.53 40.31 53.23
552.50 0.08 0.08 0.00 557.70 98.88 40.59 58.29
552.60 0.08 0.08 0.00 557.80 104.38 40.87 63.51
552.70 0.08 0.08 0.00 557.90 110.03 41.15 68.88
552.80 0.08 0.08 0.00 558.00 115.81 41.43 74.39
552.90 0.08 0.08 0.00
553.00 0.08 0.08 0.00
553.10 0.29 0.29 0.00
553.20 0.67 0.67 0.00
553.30 1.16 1.16 0.00
553.40 1.74 1.74 0.00
553.50 2.40 2.40 0.00
553.60 3.13 3.13 0.00
553.70 3.92 3.92 0.00
553.80 4.77 4.77 0.00
553.90 5.67 5.67 0.00
554.00 6.63 6.63 0.00
554.10 9.09 9.09 0.00
554.20 12.78 12.78 0.00
554.30 17.31 17.31 0.00
554.40 22.51 22.51 0.00
554.50 28.30 28.30 0.00
554.60 30.07 30.07 0.00
554.70 30.48 30.48 0.00
554.80 30.88 30.88 0.00
554.90 31.28 31.28 0.00
555.00 31.68 31.68 0.00
555.10 32.06 32.06 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 85
Stage-Area-Storage for Pond BMP#3: BMP #3
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
550.00 4,583 0 555.20 14,228 48,741
550.10 4,755 467 555.30 14,412 50,173
550.20 4,926 951 555.40 14,597 51,624
550.30 5,097 1,452 555.50 14,782 53,093
550.40 5,269 1,970 555.60 14,967 54,580
550.50 5,441 2,506 555.70 15,152 56,086
550.60 5,612 3,059 555.80 15,336 57,610
550.70 5,784 3,628 555.90 15,521 59,153
550.80 5,955 4,215 556.00 15,706 60,715
550.90 6,126 4,819 556.10 15,897 62,295
551.00 6,298 5,441 556.20 16,087 63,894
551.10 6,487 6,080 556.30 16,277 65,512
551.20 6,676 6,738 556.40 16,468 67,149
551.30 6,865 7,415 556.50 16,659 68,806
551.40 7,054 8,111 556.60 16,849 70,481
551.50 7,243 8,826 556.70 17,040 72,175
551.60 7,431 9,559 556.80 17,230 73,889
551.70 7,620 10,312 556.90 17,420 75,621
551.80 7,809 11,083 557.00 17,611 77,373
551.90 7,998 11,874 557.10 17,807 79,144
552.00 8,187 12,683 557.20 18,004 80,934
552.10 8,384 13,512 557.30 18,200 82,745
552.20 8,581 14,360 557.40 18,397 84,575
552.30 8,778 15,228 557.50 18,593 86,424
552.40 8,975 16,115 557.60 18,789 88,293
552.50 9,173 17,023 557.70 18,986 90,182
552.60 9,370 17,950 557.80 19,182 92,090
552.70 9,567 18,897 557.90 19,379 94,018
552.80 9,764 19,863 558.00 19,575 95,966
552.90 9,961 20,850
553.00 10,158 21,856
553.10 10,349 22,881
553.20 10,540 23,925
553.30 10,731 24,989
553.40 10,922 26,072
553.50 11,114 27,173
553.60 11,305 28,294
553.70 11,496 29,434
553.80 11,687 30,593
553.90 11,878 31,772
554.00 12,069 32,969
554.10 12,248 34,185
554.20 12,427 35,419
554.30 12,606 36,670
554.40 12,785 37,940
554.50 12,964 39,227
554.60 13,142 40,532
554.70 13,321 41,856
554.80 13,500 43,197
554.90 13,679 44,556
555.00 13,858 45,933
555.10 14,043 47,328

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 86
Summary for Pond BMP-1: BMP #1
Inflow Area = 28.009 ac, 50.36% Impervious, Inflow Depth = 2.59" for 10-yr-6hr event
Inflow = 125.71 cfs @ 3.15 hrs, Volume= 6.043 af
Outflow = 66.30 cfs @ 3.33 hrs, Volume= 6.043 af, Atten= 47%, Lag= 10.8 min
Primary = 66.30 cfs @ 3.33 hrs, Volume= 6.043 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 558.60' @ 3.33 hrs Surf.Area= 46,993 sf Storage= 127,790 cf
Plug-Flow detention time= 418.2 min calculated for 6.043 af(100% of inflow)
Center-of-Mass det. time= 417.8 min ( 625.1 - 207.3 )
Volume Invert Avail.Storage Storage Description
#1 555.50' 223,972 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
555.50 34,578 0 0
556.00 37,559 18,034 18,034
557.00 41,209 39,384 57,418
558.00 44,809 43,009 100,427
559.00 48,473 46,641 147,068
560.00 52,204 50,339 197,407
560.50 54,057 26,565 223,972
Device Routing Invert Outlet Devices
#1 Primary 550.00' 36.0" Round RCP_Round 36"
L= 115.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 550.00' / 548.00' S= 0.0174 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 7.07 sf
#2 Device 1 555.50' 4.0" Horiz. WQ/CP Orifice C= 0.600
Limited to weir flow at low heads
#3 Device 1 557.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 2.00 2.00
#4 Device 1 557.50' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 559.00' 20.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 87
Primary OutFlow Max=63.13 cfs © 3.33 hrs HW=558.56' (Free Discharge)
4-1=RCP Round 36" (Passes 63.13 cfs of 90.41 cfs potential flow)
2=WQ/CP Orifice (Orifice Controls 0.73 cfs © 8.42 fps)
3=Custom Weir/Orifice (Orifice Controls 5.61 cfs @ 5.61 fps)
4=Riser (Weir Controls 56.79 cfs © 3.36 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=555.50' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-1: BMP #1
Hydrograph
/�i T 17 71 7 171 17 H 1 7 171 r 1 ❑Inflow
125.71 cfs 3 outflow
0 Primary
140_
11�1 I V'W �e .0 a ❑Secondary
130/ 1 _I 1 1 A 1 I 1_1 1 Pe it Ele558.I60_'
120/
110 -r - fi rt 1-1 T 11 fi IS °rage711217[99Glf
100// I -1IIH1 + 1H - 1I1 + 1HI1H
901 RR In rf
w 8 66.30 cfs I I 1 A 1 _I 1 1
3 70�
LL 60 -/ —' rt 1 firt rt fi
50/ 1 —1 1 1
40/
30 -/ 1
20/ ,/
0.00 cfs
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 88
Pond BMP-1: BMP #1
Stage-Discharge
0 Total
0 Primary
❑Secondary
560
/�//
Broad-Crested Rectan.ular Weir �`
559 /
0 558 �
•; % j Riser
w / Custom Weir/Orifice
557
556 % WQ/CP Orifice
0 20 40 60 80 100 120 140 160 180
Discharge (cfs)
Pond BMP-1: BMP #1
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 0 Surfacel
❑Storage
560
///
///
559 z
///
0558 II
m
W II
557
- I I I
556-'
Custom Stage Data
0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 220,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 89
Hydrograph for Pond BMP-1: BMP #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 555.50 0.00 0.00 0.00
5.00 5.12 84,855 557.65 6.63 6.63 0.00
10.00 0.00 60,328 557.07 0.65 0.65 0.00
15.00 0.00 50,947 556.84 0.49 0.49 0.00
20.00 0.00 42,540 556.63 0.45 0.45 0.00
25.00 0.00 34,851 556.44 0.41 0.41 0.00
30.00 0.00 27,892 556.26 0.37 0.37 0.00
35.00 0.00 21,676 556.10 0.32 0.32 0.00
40.00 0.00 16,215 555.95 0.28 0.28 0.00
45.00 0.00 11,522 555.82 0.24 0.24 0.00
50.00 0.00 7,613 555.72 0.20 0.20 0.00
55.00 0.00 4,527 555.63 0.14 0.14 0.00
60.00 0.00 2,625 555.58 0.07 0.07 0.00
65.00 0.00 1,677 555.55 0.04 0.04 0.00
70.00 0.00 1,128 555.53 0.02 0.02 0.00
75.00 0.00 758 555.52 0.02 0.02 0.00
80.00 0.00 510 555.51 0.01 0.01 0.00
85.00 0.00 343 555.51 0.01 0.01 0.00
90.00 0.00 230 555.51 0.01 0.01 0.00
95.00 0.00 155 555.50 0.00 0.00 0.00
100.00 0.00 104 555.50 0.00 0.00 0.00
105.00 0.00 70 555.50 0.00 0.00 0.00
110.00 0.00 47 555.50 0.00 0.00 0.00
115.00 0.00 32 555.50 0.00 0.00 0.00
120.00 0.00 21 555.50 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 90
Stage-Discharge for Pond BMP-1: BMP #1
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
555.50 0.00 0.00 0.00 558.10 29.51 29.51 0.00
555.55 0.04 0.04 0.00 558.15 32.75 32.75 0.00
555.60 0.11 0.11 0.00 558.20 36.11 36.11 0.00
555.65 0.16 0.16 0.00 558.25 39.58 39.58 0.00
555.70 0.19 0.19 0.00 558.30 43.16 43.16 0.00
555.75 0.21 0.21 0.00 558.35 46.85 46.85 0.00
555.80 0.23 0.23 0.00 558.40 50.64 50.64 0.00
555.85 0.25 0.25 0.00 558.45 54.54 54.54 0.00
555.90 0.27 0.27 0.00 558.50 58.53 58.53 0.00
555.95 0.28 0.28 0.00 558.55 62.62 62.62 0.00
556.00 0.30 0.30 0.00 558.60 66.80 66.80 0.00
556.05 0.31 0.31 0.00 558.65 71.07 71.07 0.00
556.10 0.33 0.33 0.00 558.70 75.44 75.44 0.00
556.15 0.34 0.34 0.00 558.75 79.89 79.89 0.00
556.20 0.35 0.35 0.00 558.80 84.42 84.42 0.00
556.25 0.36 0.36 0.00 558.85 89.04 89.04 0.00
556.30 0.38 0.38 0.00 558.90 92.59 92.59 0.00
556.35 0.39 0.39 0.00 558.95 92.90 92.90 0.00
556.40 0.40 0.40 0.00 559.00 93.21 93.21 0.00
556.45 0.41 0.41 0.00 559.05 94.12 93.52 0.60
556.50 0.42 0.42 0.00 559.10 95.52 93.83 1.69
556.55 0.43 0.43 0.00 559.15 97.25 94.14 3.11
556.60 0.44 0.44 0.00 559.20 99.24 94.44 4.79
556.65 0.45 0.45 0.00 559.25 101.46 94.75 6.71
556.70 0.46 0.46 0.00 559.30 103.90 95.05 8.84
556.75 0.47 0.47 0.00 559.35 106.52 95.36 11.16
556.80 0.48 0.48 0.00 559.40 109.32 95.66 13.66
556.85 0.49 0.49 0.00 559.45 112.27 95.96 16.30
556.90 0.50 0.50 0.00 559.50 115.36 96.27 19.09
556.95 0.51 0.51 0.00 559.55 118.59 96.57 22.03
557.00 0.51 0.51 0.00 559.60 121.96 96.87 25.10
557.05 0.60 0.60 0.00 559.65 125.31 97.16 28.14
557.10 0.74 0.74 0.00 559.70 128.74 97.46 31.27
557.15 0.92 0.92 0.00 559.75 132.25 97.76 34.49
557.20 1.13 1.13 0.00 559.80 135.83 98.05 37.78
557.25 1.37 1.37 0.00 559.85 139.69 98.35 41.34
557.30 1.64 1.64 0.00 559.90 143.64 98.64 45.00
557.35 1.93 1.93 0.00 559.95 147.69 98.94 48.75
557.40 2.24 2.24 0.00 560.00 151.83 99.23 52.60
557.45 2.56 2.56 0.00 560.05 156.17 99.52 56.65
557.50 2.91 2.91 0.00 560.10 160.61 99.81 60.80
557.55 3.79 3.79 0.00 560.15 165.15 100.10 65.05
557.60 5.10 5.10 0.00 560.20 169.80 100.39 69.41
557.65 6.71 6.71 0.00 560.25 174.47 100.68 73.79
557.70 8.55 8.55 0.00 560.30 179.23 100.96 78.26
557.75 10.61 10.61 0.00 560.35 184.07 101.25 82.82
557.80 12.84 12.84 0.00 560.40 189.00 101.54 87.46
557.85 15.25 15.25 0.00 560.45 193.92 101.82 92.10
557.90 17.82 17.82 0.00 560.50 198.92 102.11 96.82
557.95 20.54 20.54 0.00
558.00 23.40 23.40 0.00
558.05 26.39 26.39 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 91
Stage-Area-Storage for Pond BMP-1: BMP #1
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
555.50 34,578 0 558.10 45,175 104,926
555.55 34,876 1,736 558.15 45,359 107,190
555.60 35,174 3,488 558.20 45,542 109,462
555.65 35,472 5,254 558.25 45,725 111,744
555.70 35,770 7,035 558.30 45,908 114,035
555.75 36,069 8,831 558.35 46,091 116,335
555.80 36,367 10,642 558.40 46,275 118,644
555.85 36,665 12,467 558.45 46,458 120,962
555.90 36,963 14,308 558.50 46,641 123,290
555.95 37,261 16,164 558.55 46,824 125,626
556.00 37,559 18,034 558.60 47,007 127,972
556.05 37,741 19,917 558.65 47,191 130,327
556.10 37,924 21,808 558.70 47,374 132,691
556.15 38,106 23,709 558.75 47,557 135,065
556.20 38,289 25,619 558.80 47,740 137,447
556.25 38,472 27,538 558.85 47,923 139,839
556.30 38,654 29,466 558.90 48,107 142,239
556.35 38,837 31,403 558.95 48,290 144,649
556.40 39,019 33,350 559.00 48,473 147,068
556.45 39,202 35,305 559.05 48,660 149,497
556.50 39,384 37,270 559.10 48,846 151,934
556.55 39,566 39,244 559.15 49,033 154,381
556.60 39,749 41,227 559.20 49,219 156,837
556.65 39,931 43,219 559.25 49,406 159,303
556.70 40,114 45,220 559.30 49,592 161,778
556.75 40,297 47,230 559.35 49,779 164,262
556.80 40,479 49,249 559.40 49,965 166,756
556.85 40,662 51,278 559.45 50,152 169,259
556.90 40,844 53,316 559.50 50,339 171,771
556.95 41,027 55,362 559.55 50,525 174,293
557.00 41,209 57,418 559.60 50,712 176,824
557.05 41,389 59,483 559.65 50,898 179,364
557.10 41,569 61,557 559.70 51,085 181,913
557.15 41,749 63,640 559.75 51,271 184,472
557.20 41,929 65,732 559.80 51,458 187,041
557.25 42,109 67,833 559.85 51,644 189,618
557.30 42,289 69,943 559.90 51,831 192,205
557.35 42,469 72,062 559.95 52,017 194,801
557.40 42,649 74,190 560.00 52,204 197,407
557.45 42,829 76,327 560.05 52,389 200,022
557.50 43,009 78,473 560.10 52,575 202,646
557.55 43,189 80,628 560.15 52,760 205,279
557.60 43,369 82,792 560.20 52,945 207,922
557.65 43,549 84,965 560.25 53,131 210,574
557.70 43,729 87,147 560.30 53,316 213,235
557.75 43,909 89,338 560.35 53,501 215,905
557.80 44,089 91,537 560.40 53,686 218,585
557.85 44,269 93,746 560.45 53,872 221,274
557.90 44,449 95,964 560.50 54,057 223,972
557.95 44,629 98,191
558.00 44,809 100,427
558.05 44,992 102,672

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 92
Summary for Pond BMP-2: BMP #2
Inflow Area = 6.846 ac, 45.49% Impervious, Inflow Depth = 2.50" for 10-yr-6hr event
Inflow = 29.82 cfs @ 3.15 hrs, Volume= 1.425 af
Outflow = 12.64 cfs @ 3.37 hrs, Volume= 1.425 af, Atten= 58%, Lag= 12.9 min
Primary = 12.64 cfs @ 3.37 hrs, Volume= 1.425 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 578.27' @ 3.37 hrs Surf.Area= 12,783 sf Storage= 33,203 cf
Plug-Flow detention time= 1,082.2 min calculated for 1.424 af(100% of inflow)
Center-of-Mass det. time= 1,085.5 min ( 1,293.7 - 208.2 )
Volume Invert Avail.Storage Storage Description
#1 575.00' 57,570 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
575.00 7,651 0 0
576.00 9,115 8,383 8,383
577.00 10,693 9,904 18,287
577.50 11,523 5,554 23,841
578.00 12,385 5,977 29,818
579.00 13,864 13,125 42,943
580.00 15,391 14,628 57,570
Device Routing Invert Outlet Devices
#1 Primary 574.40' 24.0" Round RCP Round 24"
L= 88.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 574.40' / 574.00' S= 0.0045 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 575.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 577.50' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 3.00 3.00
#4 Device 1 578.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 579.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 93
Primary OutFlow Max=12.20 cfs © 3.37 hrs HW=578.26' (Free Discharge)
4-1=RCP_Round 24" (Passes 12.20 cfs of 23.52 cfs potential flow)
2=Sand Filter (Custom Controls 0.08 cfs)
3=Custom Weir/Orifice (Orifice Controls 5.20 cfs @ 3.47 fps)
4=Riser (Weir Controls 6.91 cfs © 1.67 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=575.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-2: BMP #2
Hydrograph
4 I—I + , , I 1 1 1 . - Inflow
cfs `` �p �Q _ •Outflow
)-29.82
lilf1 '/`1i .V ■Secondary
32
lir
28 14 I —L 14 S�tota =33�2O3I�t —
26='.
24+' 1 LH 1 1 4 1 —I L 1 _[ L 1 _ 1 -
22
. 18� 19Rtrf
3 1LL 412.64 cfs I i i 4 L 4 1 1 L _I 4 Ili L 14
10
10
8 1 1 I
6 7 ���� Z Z ZZ
0.00 cfs , /
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 94
Pond BMP-2: BMP #2
Stage-Discharge
❑Total
❑Primary
581
�'' ❑Secondary
580
Broad-Crested Rectangular Weir
579
Riser
0 578 Custom Weir/Orifice
w 577
576
Sand Filter /
0 10 20 30 40 50 60 70 80 90 100
Discharge (cfs)
Pond BMP-2: BMP #2
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,00011,00012,00013,00014,00015,000 Surface
` . ❑Storage
581
580:-/
i
579:-/
w 577� i ////���� II
576-
_ J J
Custom Stage Data
575 , , , , , , , ,
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 95
Hydrograph for Pond BMP-2: BMP #2
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 575.00 0.00 0.00 0.00
5.00 1.24 27,368 577.80 1.70 1.70 0.00
10.00 0.00 23,409 577.46 0.08 0.08 0.00
15.00 0.00 21,951 577.33 0.08 0.08 0.00
20.00 0.00 20,493 577.20 0.08 0.08 0.00
25.00 0.00 19,035 577.07 0.08 0.08 0.00
30.00 0.00 17,577 576.93 0.08 0.08 0.00
35.00 0.00 16,119 576.79 0.08 0.08 0.00
40.00 0.00 14,661 576.65 0.08 0.08 0.00
45.00 0.00 13,203 576.51 0.08 0.08 0.00
50.00 0.00 11,745 576.36 0.08 0.08 0.00
55.00 0.00 10,287 576.21 0.08 0.08 0.00
60.00 0.00 8,829 576.05 0.08 0.08 0.00
65.00 0.00 7,371 575.89 0.08 0.08 0.00
70.00 0.00 5,913 575.72 0.08 0.08 0.00
75.00 0.00 4,455 575.55 0.08 0.08 0.00
80.00 0.00 2,997 575.38 0.08 0.08 0.00
85.00 0.00 1,539 575.20 0.08 0.08 0.00
90.00 0.00 81 575.01 0.08 0.08 0.00
95.00 0.00 0 575.00 0.00 0.00 0.00
100.00 0.00 0 575.00 0.00 0.00 0.00
105.00 0.00 0 575.00 0.00 0.00 0.00
110.00 0.00 0 575.00 0.00 0.00 0.00
115.00 0.00 0 575.00 0.00 0.00 0.00
120.00 0.00 0 575.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 96
Stage-Discharge for Pond BMP-2: BMP #2
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
575.00 0.00 0.00 0.00 580.20 66.77 32.06 34.70
575.10 0.08 0.08 0.00 580.30 71.57 32.44 39.13
575.20 0.08 0.08 0.00 580.40 76.55 32.82 43.73
575.30 0.08 0.08 0.00 580.50 81.60 33.19 48.41
575.40 0.08 0.08 0.00 580.60 86.78 33.55 53.23
575.50 0.08 0.08 0.00 580.70 92.21 33.92 58.29
575.60 0.08 0.08 0.00 580.80 97.79 34.28 63.51
575.70 0.08 0.08 0.00 580.90 103.51 34.63 68.88
575.80 0.08 0.08 0.00 581.00 109.37 34.98 74.39
575.90 0.08 0.08 0.00
576.00 0.08 0.08 0.00
576.10 0.08 0.08 0.00
576.20 0.08 0.08 0.00
576.30 0.08 0.08 0.00
576.40 0.08 0.08 0.00
576.50 0.08 0.08 0.00
576.60 0.08 0.08 0.00
576.70 0.08 0.08 0.00
576.80 0.08 0.08 0.00
576.90 0.08 0.08 0.00
577.00 0.08 0.08 0.00
577.10 0.08 0.08 0.00
577.20 0.08 0.08 0.00
577.30 0.08 0.08 0.00
577.40 0.08 0.08 0.00
577.50 0.08 0.08 0.00
577.60 0.39 0.39 0.00
577.70 0.96 0.96 0.00
577.80 1.70 1.70 0.00
577.90 2.57 2.57 0.00
578.00 3.55 3.55 0.00
578.10 5.99 5.99 0.00
578.20 9.64 9.64 0.00
578.30 14.09 14.09 0.00
578.40 19.22 19.22 0.00
578.50 24.74 24.74 0.00
578.60 25.23 25.23 0.00
578.70 25.71 25.71 0.00
578.80 26.18 26.18 0.00
578.90 26.64 26.64 0.00
579.00 27.10 27.10 0.00
579.10 28.39 27.55 0.85
579.20 30.38 27.99 2.40
579.30 32.84 28.42 4.42
579.40 35.68 28.85 6.83
579.50 38.82 29.27 9.55
579.60 42.23 29.68 12.55
579.70 45.73 30.09 15.64
579.80 49.39 30.50 18.89
579.90 53.39 30.90 22.50
580.00 57.59 31.29 26.30
580.10 62.08 31.68 30.40

Detention
Davis Village Charlotte 6-hr 10-yr 10-yr-6hr Rainfall=3.75"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 97
Stage-Area-Storage for Pond BMP-2: BMP #2
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
575.00 7,651 0 580.20 15,391 57,570
575.10 7,797 772 580.30 15,391 57,570
575.20 7,944 1,559 580.40 15,391 57,570
575.30 8,090 2,361 580.50 15,391 57,570
575.40 8,237 3,178 580.60 15,391 57,570
575.50 8,383 4,009 580.70 15,391 57,570
575.60 8,529 4,854 580.80 15,391 57,570
575.70 8,676 5,714 580.90 15,391 57,570
575.80 8,822 6,589 581.00 15,391 57,570
575.90 8,969 7,479
576.00 9,115 8,383
576.10 9,273 9,302
576.20 9,431 10,238
576.30 9,588 11,189
576.40 9,746 12,155
576.50 9,904 13,138
576.60 10,062 14,136
576.70 10,220 15,150
576.80 10,377 16,180
576.90 10,535 17,226
577.00 10,693 18,287
577.10 10,859 19,365
577.20 11,025 20,459
577.30 11,191 21,570
577.40 11,357 22,697
577.50 11,523 23,841
577.60 11,695 25,002
577.70 11,868 26,180
577.80 12,040 27,375
577.90 12,213 28,588
578.00 12,385 29,818
578.10 12,533 31,064
578.20 12,681 32,325
578.30 12,829 33,600
578.40 12,977 34,890
578.50 13,125 36,195
578.60 13,272 37,515
578.70 13,420 38,850
578.80 13,568 40,199
578.90 13,716 41,563
579.00 13,864 42,943
579.10 14,017 44,337
579.20 14,169 45,746
579.30 14,322 47,170
579.40 14,475 48,610
579.50 14,628 50,065
579.60 14,780 51,536
579.70 14,933 53,021
579.80 15,086 54,522
579.90 15,238 56,039
580.00 15,391 57,570
580.10 15,391 57,570

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 98
Time span=0.00-120.00 hrs, dt=0.10 hrs, 1201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA#1: Post-Development Runoff Area=28.009 ac 50.36% Impervious Runoff Depth=3.24"
Tc=5.0 min CN=89 Runoff=154.57 cfs 7.558 af
Subcatchment DA#2: Post-Development Runoff Area=6.846 ac 45.49% Impervious Runoff Depth=3.14"
Tc=5.0 min CN=88 Runoff=36.82 cfs 1.791 af
Subcatchment DA#3: Post-Development Runoff Area=4.651 ac 56.27% Impervious Runoff Depth=3.34"
Tc=5.0 min CN=90 Runoff=26.30 cfs 1.294 af
Subcatchment PRE#1: Predevelopment#1 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=2.76"
Tc=29.5 min CN=84 Runoff=82.46 cfs 6.448 af
Subcatchment PRE#2: Predevelopment#2 Runoff Area=6.846 ac 0.00% Impervious Runoff Depth=2.76"
Tc=31.9 min CN=84 Runoff=19.39 cfs 1.576 of
SubcatchmentPRE#3: Predevelopment#3 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=2.76"
Tc=31.9 min CN=84 Runoff=79.33 cfs 6.448 af
Pond BMP#3: BMP#3 Peak Elev=554.05' Storage=33,565 cf Inflow=26.30 cfs 1.294 af
Primary=7.62 cfs 1.294 af Secondary=0.00 cfs 0.000 af Outflow=7.62 cfs 1.294 af
Pond BMP-1: BMP#1 Peak Elev=558.93' Storage=143,553 cf Inflow=154.57 cfs 7.558 af
Primary=92.79 cfs 7.558 af Secondary=0.00 cfs 0.000 af Outflow=92.79 cfs 7.558 af
Pond BMP-2: BMP#2 Peak Elev=578.51' Storage=36,359 cf Inflow=36.82 cfs 1.791 af
Primary=24.43 cfs 1.791 af Secondary=0.00 cfs 0.000 af Outflow=24.43 cfs 1.791 af
Total Runoff Area = 102.372 ac Runoff Volume = 25.117 af Average Runoff Depth = 2.94"
80.62% Pervious = 82.537 ac 19.38% Impervious = 19.835 ac

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 99
Summary for Subcatchment DA#1: Post-Development Pond #1
Runoff = 154.57 cfs @ 3.15 hrs, Volume= 7.558 af, Depth= 3.24"
Routed to Pond BMP-1 : BMP #1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Area (ac) CN Description
• 3.238 98 Roadway
• 1.043 98 Sidewalk
• 9.823 98 Buildings/Driveways
13.905 80 >75% Grass cover, Good, HSG D
28.009 89 Weighted Average
13.905 49.64% Pervious Area
14.104 50.36% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#1: Post-Development Pond #1
Hydrograph
170 I I I I0 Runoff
154.57 cfs _ 4 4 4 � �
150_" barote 6hr/
140_ - - 25-yr-6h �+�,fa41 14L'
130=�
120=H Runoff ilV�ea2 0109
110_/ T fftVQ i I3
100=
711 90 / —h —114h1191ff 1D4Pr=r-IF411
0 80 / c=5.0-- ini
70 64=86
60
50 / IJ LI
40 1 I 1 1 I 7 r 1
30
20 /
10_ /�
0 /
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 100
Hydrograph for Subcatchment DA#1: Post-Development Pond #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.44 3.24 0.00
2.00 0.48 0.04 2.85 106.00 4.44 3.24 0.00
4.00 3.92 2.75 15.38 108.00 4.44 3.24 0.00
6.00 4.44 3.24 4.50 110.00 4.44 3.24 0.00
8.00 4.44 3.24 0.00 112.00 4.44 3.24 0.00
10.00 4.44 3.24 0.00 114.00 4.44 3.24 0.00
12.00 4.44 3.24 0.00 116.00 4.44 3.24 0.00
14.00 4.44 3.24 0.00 118.00 4.44 3.24 0.00
16.00 4.44 3.24 0.00 120.00 4.44 3.24 0.00
18.00 4.44 3.24 0.00
20.00 4.44 3.24 0.00
22.00 4.44 3.24 0.00
24.00 4.44 3.24 0.00
26.00 4.44 3.24 0.00
28.00 4.44 3.24 0.00
30.00 4.44 3.24 0.00
32.00 4.44 3.24 0.00
34.00 4.44 3.24 0.00
36.00 4.44 3.24 0.00
38.00 4.44 3.24 0.00
40.00 4.44 3.24 0.00
42.00 4.44 3.24 0.00
44.00 4.44 3.24 0.00
46.00 4.44 3.24 0.00
48.00 4.44 3.24 0.00
50.00 4.44 3.24 0.00
52.00 4.44 3.24 0.00
54.00 4.44 3.24 0.00
56.00 4.44 3.24 0.00
58.00 4.44 3.24 0.00
60.00 4.44 3.24 0.00
62.00 4.44 3.24 0.00
64.00 4.44 3.24 0.00
66.00 4.44 3.24 0.00
68.00 4.44 3.24 0.00
70.00 4.44 3.24 0.00
72.00 4.44 3.24 0.00
74.00 4.44 3.24 0.00
76.00 4.44 3.24 0.00
78.00 4.44 3.24 0.00
80.00 4.44 3.24 0.00
82.00 4.44 3.24 0.00
84.00 4.44 3.24 0.00
86.00 4.44 3.24 0.00
88.00 4.44 3.24 0.00
90.00 4.44 3.24 0.00
92.00 4.44 3.24 0.00
94.00 4.44 3.24 0.00
96.00 4.44 3.24 0.00
98.00 4.44 3.24 0.00
100.00 4.44 3.24 0.00
102.00 4.44 3.24 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 101
Summary for Subcatchment DA#2: Post-Development Pond #2
Runoff = 36.82 cfs @ 3.15 hrs, Volume= 1.791 af, Depth= 3.14"
Routed to Pond BMP-2 : BMP #2
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Area (ac) CN Description
• 1.262 98 Roadway
• 0.445 98 Sidewalk
• 0.964 98 Buildings/Driveways
3.732 80 >75% Grass cover, Good, HSG D
• 0.443 98 Amenity Impervious
6.846 88 Weighted Average
3.732 54.51% Pervious Area
3.114 45.49% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#2: Post-Development Pond #2
Hydrograph
111
■Runoff
36.82 cfs _ H H H
36 r H Cba4o #e_ 6-hr� ��- r -
34= , fi 2 114 h R11i1# 114.144" _
32='
30_ IROnaFA a=6.846 AM
28_'
26
24 1R pff Vial4-rne7-1.7-91f13
201 !R-1.!rirlD?P -h=73.1.1-4:1
-
18 Ic 5.0min
16_% I - - 1_ I 6-NJ=i8
14='
12= / I � I A - 14 I- I -k I
10_ —
8 / _4 4 I- I -I I 4 ]- I -
6
4= i%
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 102
Hydrograph for Subcatchment DA#2: Post-Development Pond #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.44 3.14 0.00
2.00 0.48 0.03 0.58 106.00 4.44 3.14 0.00
4.00 3.92 2.65 3.72 108.00 4.44 3.14 0.00
6.00 4.44 3.14 1.09 110.00 4.44 3.14 0.00
8.00 4.44 3.14 0.00 112.00 4.44 3.14 0.00
10.00 4.44 3.14 0.00 114.00 4.44 3.14 0.00
12.00 4.44 3.14 0.00 116.00 4.44 3.14 0.00
14.00 4.44 3.14 0.00 118.00 4.44 3.14 0.00
16.00 4.44 3.14 0.00 120.00 4.44 3.14 0.00
18.00 4.44 3.14 0.00
20.00 4.44 3.14 0.00
22.00 4.44 3.14 0.00
24.00 4.44 3.14 0.00
26.00 4.44 3.14 0.00
28.00 4.44 3.14 0.00
30.00 4.44 3.14 0.00
32.00 4.44 3.14 0.00
34.00 4.44 3.14 0.00
36.00 4.44 3.14 0.00
38.00 4.44 3.14 0.00
40.00 4.44 3.14 0.00
42.00 4.44 3.14 0.00
44.00 4.44 3.14 0.00
46.00 4.44 3.14 0.00
48.00 4.44 3.14 0.00
50.00 4.44 3.14 0.00
52.00 4.44 3.14 0.00
54.00 4.44 3.14 0.00
56.00 4.44 3.14 0.00
58.00 4.44 3.14 0.00
60.00 4.44 3.14 0.00
62.00 4.44 3.14 0.00
64.00 4.44 3.14 0.00
66.00 4.44 3.14 0.00
68.00 4.44 3.14 0.00
70.00 4.44 3.14 0.00
72.00 4.44 3.14 0.00
74.00 4.44 3.14 0.00
76.00 4.44 3.14 0.00
78.00 4.44 3.14 0.00
80.00 4.44 3.14 0.00
82.00 4.44 3.14 0.00
84.00 4.44 3.14 0.00
86.00 4.44 3.14 0.00
88.00 4.44 3.14 0.00
90.00 4.44 3.14 0.00
92.00 4.44 3.14 0.00
94.00 4.44 3.14 0.00
96.00 4.44 3.14 0.00
98.00 4.44 3.14 0.00
100.00 4.44 3.14 0.00
102.00 4.44 3.14 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 103
Summary for Subcatchment DA#3: Post-Development Pond #3
Runoff = 26.30 cfs @ 3.15 hrs, Volume= 1.294 af, Depth= 3.34"
Routed to Pond BMP#3 : BMP #3
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Area (ac) CN Description
• 0.677 98 Roadway
• 0.221 98 Sidewalk
• 1.481 98 Buildings/Driveways
2.034 80 >75% Grass cover, Good, HSG D
• 0.203 98 Parking
• 0.035 98 Ex. Impervious
4.651 90 Weighted Average
2.034 43.73% Pervious Area
2.617 56.27% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#3: Post-Development Pond #3
Hydrograph
■Runoff
26.30 cfs 26- / t Chailotte 6-hri -I r —
24 — �2rhRainf�ll�4. "
22
20 - fi rt 1RUnroftAlrea=4.6511
18_ Rncff Volume1.294f
13
° 14 - - !Zunoff,II?pp73. 4"
C�S$ min -
LL
12_ 1
10- ���+++������111---777���JJJ
8-�/
6= j - —
4-
2-
- j� �
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 104
Hydrograph for Subcatchment DA#3: Post-Development Pond #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.44 3.34 0.00
2.00 0.48 0.05 0.56 106.00 4.44 3.34 0.00
4.00 3.92 2.84 2.58 108.00 4.44 3.34 0.00
6.00 4.44 3.34 0.75 110.00 4.44 3.34 0.00
8.00 4.44 3.34 0.00 112.00 4.44 3.34 0.00
10.00 4.44 3.34 0.00 114.00 4.44 3.34 0.00
12.00 4.44 3.34 0.00 116.00 4.44 3.34 0.00
14.00 4.44 3.34 0.00 118.00 4.44 3.34 0.00
16.00 4.44 3.34 0.00 120.00 4.44 3.34 0.00
18.00 4.44 3.34 0.00
20.00 4.44 3.34 0.00
22.00 4.44 3.34 0.00
24.00 4.44 3.34 0.00
26.00 4.44 3.34 0.00
28.00 4.44 3.34 0.00
30.00 4.44 3.34 0.00
32.00 4.44 3.34 0.00
34.00 4.44 3.34 0.00
36.00 4.44 3.34 0.00
38.00 4.44 3.34 0.00
40.00 4.44 3.34 0.00
42.00 4.44 3.34 0.00
44.00 4.44 3.34 0.00
46.00 4.44 3.34 0.00
48.00 4.44 3.34 0.00
50.00 4.44 3.34 0.00
52.00 4.44 3.34 0.00
54.00 4.44 3.34 0.00
56.00 4.44 3.34 0.00
58.00 4.44 3.34 0.00
60.00 4.44 3.34 0.00
62.00 4.44 3.34 0.00
64.00 4.44 3.34 0.00
66.00 4.44 3.34 0.00
68.00 4.44 3.34 0.00
70.00 4.44 3.34 0.00
72.00 4.44 3.34 0.00
74.00 4.44 3.34 0.00
76.00 4.44 3.34 0.00
78.00 4.44 3.34 0.00
80.00 4.44 3.34 0.00
82.00 4.44 3.34 0.00
84.00 4.44 3.34 0.00
86.00 4.44 3.34 0.00
88.00 4.44 3.34 0.00
90.00 4.44 3.34 0.00
92.00 4.44 3.34 0.00
94.00 4.44 3.34 0.00
96.00 4.44 3.34 0.00
98.00 4.44 3.34 0.00
100.00 4.44 3.34 0.00
102.00 4.44 3.34 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 105
Summary for Subcatchment PRE#1: Predevelopment #1
Runoff = 82.46 cfs @ 3.48 hrs, Volume= 6.448 af, Depth= 2.76"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
29.5 Direct Entry,
Subcatchment PRE#1: Predevelopment #1
Hydrograph
— I H H + ]- 1 -1 •Runoff
82.46 cfs 1 1 -k 1 1 4 I— 6aroitel -
80 Czhr2�- r
75= / —1 —
70
65/1 H H H H I ufaff Areat28.0-10 —
55 / H H H "RIM Pff VIL me 644 f
50� / I !Rhi!nr11)!1h7r1
-0 45 LT. 40� / TCi9.
35V H 7171 T 7171 T 1 7 1— 17 1717 GLi _
25 -/ rt fi rt l rt 11
15- t t III
10501
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 106
Hydrograph for Subcatchment PRE#1: Predevelopment #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.44 2.76 0.00
2.00 0.48 0.01 0.05 106.00 4.44 2.76 0.00
4.00 3.92 2.30 30.05 108.00 4.44 2.76 0.00
6.00 4.44 2.76 4.98 110.00 4.44 2.76 0.00
8.00 4.44 2.76 0.00 112.00 4.44 2.76 0.00
10.00 4.44 2.76 0.00 114.00 4.44 2.76 0.00
12.00 4.44 2.76 0.00 116.00 4.44 2.76 0.00
14.00 4.44 2.76 0.00 118.00 4.44 2.76 0.00
16.00 4.44 2.76 0.00 120.00 4.44 2.76 0.00
18.00 4.44 2.76 0.00
20.00 4.44 2.76 0.00
22.00 4.44 2.76 0.00
24.00 4.44 2.76 0.00
26.00 4.44 2.76 0.00
28.00 4.44 2.76 0.00
30.00 4.44 2.76 0.00
32.00 4.44 2.76 0.00
34.00 4.44 2.76 0.00
36.00 4.44 2.76 0.00
38.00 4.44 2.76 0.00
40.00 4.44 2.76 0.00
42.00 4.44 2.76 0.00
44.00 4.44 2.76 0.00
46.00 4.44 2.76 0.00
48.00 4.44 2.76 0.00
50.00 4.44 2.76 0.00
52.00 4.44 2.76 0.00
54.00 4.44 2.76 0.00
56.00 4.44 2.76 0.00
58.00 4.44 2.76 0.00
60.00 4.44 2.76 0.00
62.00 4.44 2.76 0.00
64.00 4.44 2.76 0.00
66.00 4.44 2.76 0.00
68.00 4.44 2.76 0.00
70.00 4.44 2.76 0.00
72.00 4.44 2.76 0.00
74.00 4.44 2.76 0.00
76.00 4.44 2.76 0.00
78.00 4.44 2.76 0.00
80.00 4.44 2.76 0.00
82.00 4.44 2.76 0.00
84.00 4.44 2.76 0.00
86.00 4.44 2.76 0.00
88.00 4.44 2.76 0.00
90.00 4.44 2.76 0.00
92.00 4.44 2.76 0.00
94.00 4.44 2.76 0.00
96.00 4.44 2.76 0.00
98.00 4.44 2.76 0.00
100.00 4.44 2.76 0.00
102.00 4.44 2.76 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 107
Summary for Subcatchment PRE#2: Predevelopment #2
Runoff = 19.39 cfs @ 3.51 hrs, Volume= 1.576 af, Depth= 2.76"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Area (ac) CN Description
6.846 84 Pasture/grassland/range, Fair, HSG D
6.846 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#2: Predevelopment #2
Hydrograph
. -k I— I —[ 1— I - •Runoff
19.39 cfs 1 -- H 1 -1 H 1 4 1— f-
19 a tie 64hr2� r
18= 2ylrhrRaihfll ' -
17 fi -r � l � fi rt
16_
15 T I I I I IRunbtEAIE a I6.846 -
= � r 14 nti1`_ Y I mei• 1
H1 - 1 H- 1 4 1— Rn f113-! '17
11
o 10 - TC= 1 nitn
LL rt fi H 11 -1 H rt 1- 1 - fi 1 1 —h 61.44 -
8
6�
5-_
4= 1 1 4 1— 1 —1 1 - 1 -
3_ —
!.
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 108
Hydrograph for Subcatchment PRE#2: Predevelopment #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.44 2.76 0.00
2.00 0.48 0.01 0.01 106.00 4.44 2.76 0.00
4.00 3.92 2.30 8.02 108.00 4.44 2.76 0.00
6.00 4.44 2.76 1.23 110.00 4.44 2.76 0.00
8.00 4.44 2.76 0.00 112.00 4.44 2.76 0.00
10.00 4.44 2.76 0.00 114.00 4.44 2.76 0.00
12.00 4.44 2.76 0.00 116.00 4.44 2.76 0.00
14.00 4.44 2.76 0.00 118.00 4.44 2.76 0.00
16.00 4.44 2.76 0.00 120.00 4.44 2.76 0.00
18.00 4.44 2.76 0.00
20.00 4.44 2.76 0.00
22.00 4.44 2.76 0.00
24.00 4.44 2.76 0.00
26.00 4.44 2.76 0.00
28.00 4.44 2.76 0.00
30.00 4.44 2.76 0.00
32.00 4.44 2.76 0.00
34.00 4.44 2.76 0.00
36.00 4.44 2.76 0.00
38.00 4.44 2.76 0.00
40.00 4.44 2.76 0.00
42.00 4.44 2.76 0.00
44.00 4.44 2.76 0.00
46.00 4.44 2.76 0.00
48.00 4.44 2.76 0.00
50.00 4.44 2.76 0.00
52.00 4.44 2.76 0.00
54.00 4.44 2.76 0.00
56.00 4.44 2.76 0.00
58.00 4.44 2.76 0.00
60.00 4.44 2.76 0.00
62.00 4.44 2.76 0.00
64.00 4.44 2.76 0.00
66.00 4.44 2.76 0.00
68.00 4.44 2.76 0.00
70.00 4.44 2.76 0.00
72.00 4.44 2.76 0.00
74.00 4.44 2.76 0.00
76.00 4.44 2.76 0.00
78.00 4.44 2.76 0.00
80.00 4.44 2.76 0.00
82.00 4.44 2.76 0.00
84.00 4.44 2.76 0.00
86.00 4.44 2.76 0.00
88.00 4.44 2.76 0.00
90.00 4.44 2.76 0.00
92.00 4.44 2.76 0.00
94.00 4.44 2.76 0.00
96.00 4.44 2.76 0.00
98.00 4.44 2.76 0.00
100.00 4.44 2.76 0.00
102.00 4.44 2.76 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 109
Summary for Subcatchment PRE#3: Predevelopment #3
Runoff = 79.33 cfs @ 3.51 hrs, Volume= 6.448 af, Depth= 2.76"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#3: Predevelopment #3
Hydrograph
I ■Runoff
79.33 cfs
80' 1Car�tot+el 6_4hr1 -r
75=
70_ 1 H- 1 1 �2y1rhRai�fll .�4�"
65= fi fi 1 H- Imhoff Area#28.01-0-at —
60=
55= I1 H- H H- —1 HR 9f V 14mIe6• i3 f -
50
• 45t — —I 4 1 1 1- —1 4 1— !n #F11)-! '17"
O - Tc= 'I.._ nun _
35 H- 11 _L 4 I _L 1_ 1 _ 1 1 _H6NL
30 ' _
25t0
1- 171 T 7 1- 1 -1 T
15_'
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 110
Hydrograph for Subcatchment PRE#3: Predevelopment #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.44 2.76 0.00
2.00 0.48 0.01 0.04 106.00 4.44 2.76 0.00
4.00 3.92 2.30 32.81 108.00 4.44 2.76 0.00
6.00 4.44 2.76 5.04 110.00 4.44 2.76 0.00
8.00 4.44 2.76 0.00 112.00 4.44 2.76 0.00
10.00 4.44 2.76 0.00 114.00 4.44 2.76 0.00
12.00 4.44 2.76 0.00 116.00 4.44 2.76 0.00
14.00 4.44 2.76 0.00 118.00 4.44 2.76 0.00
16.00 4.44 2.76 0.00 120.00 4.44 2.76 0.00
18.00 4.44 2.76 0.00
20.00 4.44 2.76 0.00
22.00 4.44 2.76 0.00
24.00 4.44 2.76 0.00
26.00 4.44 2.76 0.00
28.00 4.44 2.76 0.00
30.00 4.44 2.76 0.00
32.00 4.44 2.76 0.00
34.00 4.44 2.76 0.00
36.00 4.44 2.76 0.00
38.00 4.44 2.76 0.00
40.00 4.44 2.76 0.00
42.00 4.44 2.76 0.00
44.00 4.44 2.76 0.00
46.00 4.44 2.76 0.00
48.00 4.44 2.76 0.00
50.00 4.44 2.76 0.00
52.00 4.44 2.76 0.00
54.00 4.44 2.76 0.00
56.00 4.44 2.76 0.00
58.00 4.44 2.76 0.00
60.00 4.44 2.76 0.00
62.00 4.44 2.76 0.00
64.00 4.44 2.76 0.00
66.00 4.44 2.76 0.00
68.00 4.44 2.76 0.00
70.00 4.44 2.76 0.00
72.00 4.44 2.76 0.00
74.00 4.44 2.76 0.00
76.00 4.44 2.76 0.00
78.00 4.44 2.76 0.00
80.00 4.44 2.76 0.00
82.00 4.44 2.76 0.00
84.00 4.44 2.76 0.00
86.00 4.44 2.76 0.00
88.00 4.44 2.76 0.00
90.00 4.44 2.76 0.00
92.00 4.44 2.76 0.00
94.00 4.44 2.76 0.00
96.00 4.44 2.76 0.00
98.00 4.44 2.76 0.00
100.00 4.44 2.76 0.00
102.00 4.44 2.76 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 111
Summary for Pond BMP#3: BMP #3
Inflow Area = 4.651 ac, 56.27% Impervious, Inflow Depth = 3.34" for 25-yr-6hr event
Inflow = 26.30 cfs @ 3.15 hrs, Volume= 1.294 af
Outflow = 7.62 cfs @ 3.44 hrs, Volume= 1.294 af, Atten= 71%, Lag= 17.5 min
Primary = 7.62 cfs @ 3.44 hrs, Volume= 1.294 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 554.05' @ 3.44 hrs Surf.Area= 12,157 sf Storage= 33,565 cf
Plug-Flow detention time= 1,032.2 min calculated for 1.294 af(100% of inflow)
Center-of-Mass det. time= 1,032.1 min ( 1,237.2 - 205.1 )
Volume Invert Avail.Storage Storage Description
#1 550.00' 95,966 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
550.00 4,583 0 0
551.00 6,298 5,441 5,441
552.00 8,187 7,243 12,683
553.00 10,158 9,173 21,856
554.00 12,069 11,114 32,969
555.00 13,858 12,964 45,933
556.00 15,706 14,782 60,715
557.00 17,611 16,659 77,373
558.00 19,575 18,593 95,966
Device Routing Invert Outlet Devices
#1 Primary 549.50' 24.0" Round RCP Round 24"
L= 85.0' RCP, square edge headwall, Ke= 0.500
Inlet/Outlet Invert= 549.50' / 548.96' S= 0.0064 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 550.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 553.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 2.00 2.00
#4 Device 1 554.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 556.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 112
Primary OutFlow Max=7.24 cfs © 3.44 hrs HW=554.03' (Free Discharge)
L1=RCP_Round 24" (Passes 7.24 cfs of 27.63 cfs potential flow)
2=Sand Filter (Custom Controls 0.08 cfs)
3=Custom Weir/Orifice (Orifice Controls 6.84 cfs @ 3.42 fps)
4=Riser (Weir Controls 0.32 cfs © 0.60 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=550.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP#3: BMP #3
Hydrograph
Al— I I— J 1 1 1— - 1 I i— I —L 1 - Inflow
26.30 cfs EEEary
T 1 T T T 1 I�pf1 �4� 16M 1 -
28J 1 I— —L 1 ± Peak E1tev 554.b5' —
26
24-; 1 1 1 Sto a 565-cf —
22
20� _L _I T 1 _[ L I _L
187: / _o16� —1 TIT TIT _
14 —h 1 1 T1 � 1— H H— H T1 —F 1-1H 1 —
'L 1 �l 7 R7 rf I
id 7.62 cfs 1 1 T 1 ]— 4 - 14 I—14 1
8
s 1 1 1 1 I ' 1 1 1 1
4 ////// / /
0.00 cfs
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 113
Pond BMP#3: BMP #3
Stage-Discharge
❑Total '
558 ❑Primary
- z ❑Secondary
557 /
�� Broad-Crested Rectan.ular Weir
556
^ 555 -1/
.2 /a�' Riser
0 554 '
�III Custom Weir/Orifice
553 %
552
551 Sand Filter
/
0 10 20 30 40 50 60 70 80 90 100 110
Discharge (cfs)
Pond BMP#3: BMP #3
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 Surface
❑Storage
558_ I I 1 ��
557 I ��� �� I I I
5561/
555� ��/�/ —
- z— II II I //' I I
/
o 554- /z I I 41 I
> -
w 553LZ I 4 I I 4I 1
552:/ I -I I -
5511/ 1
Custom Stage Data
550 ( ,
0 10,,000 20,000 30,000 40,000 50,000 60,,000 70,000 80,000 90,000'
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 114
Hydrograph for Pond BMP#3: BMP #3
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 550.00 0.00 0.00 0.00
5.00 1.08 25,902 553.38 1.65 1.65 0.00
10.00 0.00 21,527 552.97 0.08 0.08 0.00
15.00 0.00 20,069 552.82 0.08 0.08 0.00
20.00 0.00 18,611 552.67 0.08 0.08 0.00
25.00 0.00 17,153 552.51 0.08 0.08 0.00
30.00 0.00 15,695 552.35 0.08 0.08 0.00
35.00 0.00 14,237 552.19 0.08 0.08 0.00
40.00 0.00 12,779 552.01 0.08 0.08 0.00
45.00 0.00 11,321 551.83 0.08 0.08 0.00
50.00 0.00 9,863 551.64 0.08 0.08 0.00
55.00 0.00 8,405 551.44 0.08 0.08 0.00
60.00 0.00 6,947 551.23 0.08 0.08 0.00
65.00 0.00 5,489 551.01 0.08 0.08 0.00
70.00 0.00 4,031 550.77 0.08 0.08 0.00
75.00 0.00 2,573 550.51 0.08 0.08 0.00
80.00 0.00 1,115 550.23 0.08 0.08 0.00
85.00 0.00 0 550.00 0.00 0.00 0.00
90.00 0.00 0 550.00 0.00 0.00 0.00
95.00 0.00 0 550.00 0.00 0.00 0.00
100.00 0.00 0 550.00 0.00 0.00 0.00
105.00 0.00 0 550.00 0.00 0.00 0.00
110.00 0.00 0 550.00 0.00 0.00 0.00
115.00 0.00 0 550.00 0.00 0.00 0.00
120.00 0.00 0 550.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 115
Stage-Discharge for Pond BMP#3: BMP #3
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
550.00 0.00 0.00 0.00 555.20 32.45 32.45 0.00
550.10 0.08 0.08 0.00 555.30 32.83 32.83 0.00
550.20 0.08 0.08 0.00 555.40 33.21 33.21 0.00
550.30 0.08 0.08 0.00 555.50 33.58 33.58 0.00
550.40 0.08 0.08 0.00 555.60 33.95 33.95 0.00
550.50 0.08 0.08 0.00 555.70 34.31 34.31 0.00
550.60 0.08 0.08 0.00 555.80 34.67 34.67 0.00
550.70 0.08 0.08 0.00 555.90 35.03 35.03 0.00
550.80 0.08 0.08 0.00 556.00 35.38 35.38 0.00
550.90 0.08 0.08 0.00 556.10 36.58 35.73 0.85
551.00 0.08 0.08 0.00 556.20 38.47 36.07 2.40
551.10 0.08 0.08 0.00 556.30 40.84 36.42 4.42
551.20 0.08 0.08 0.00 556.40 43.57 36.74 6.83
551.30 0.08 0.08 0.00 556.50 46.60 37.05 9.55
551.40 0.08 0.08 0.00 556.60 49.91 37.36 12.55
551.50 0.08 0.08 0.00 556.70 53.30 37.67 15.64
551.60 0.08 0.08 0.00 556.80 56.86 37.97 18.89
551.70 0.08 0.08 0.00 556.90 60.77 38.27 22.50
551.80 0.08 0.08 0.00 557.00 64.87 38.57 26.30
551.90 0.08 0.08 0.00 557.10 69.26 38.86 30.40
552.00 0.08 0.08 0.00 557.20 73.86 39.15 34.70
552.10 0.08 0.08 0.00 557.30 78.58 39.45 39.13
552.20 0.08 0.08 0.00 557.40 83.47 39.73 43.73
552.30 0.08 0.08 0.00 557.50 88.43 40.02 48.41
552.40 0.08 0.08 0.00 557.60 93.53 40.31 53.23
552.50 0.08 0.08 0.00 557.70 98.88 40.59 58.29
552.60 0.08 0.08 0.00 557.80 104.38 40.87 63.51
552.70 0.08 0.08 0.00 557.90 110.03 41.15 68.88
552.80 0.08 0.08 0.00 558.00 115.81 41.43 74.39
552.90 0.08 0.08 0.00
553.00 0.08 0.08 0.00
553.10 0.29 0.29 0.00
553.20 0.67 0.67 0.00
553.30 1.16 1.16 0.00
553.40 1.74 1.74 0.00
553.50 2.40 2.40 0.00
553.60 3.13 3.13 0.00
553.70 3.92 3.92 0.00
553.80 4.77 4.77 0.00
553.90 5.67 5.67 0.00
554.00 6.63 6.63 0.00
554.10 9.09 9.09 0.00
554.20 12.78 12.78 0.00
554.30 17.31 17.31 0.00
554.40 22.51 22.51 0.00
554.50 28.30 28.30 0.00
554.60 30.07 30.07 0.00
554.70 30.48 30.48 0.00
554.80 30.88 30.88 0.00
554.90 31.28 31.28 0.00
555.00 31.68 31.68 0.00
555.10 32.06 32.06 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 116
Stage-Area-Storage for Pond BMP#3: BMP #3
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
550.00 4,583 0 555.20 14,228 48,741
550.10 4,755 467 555.30 14,412 50,173
550.20 4,926 951 555.40 14,597 51,624
550.30 5,097 1,452 555.50 14,782 53,093
550.40 5,269 1,970 555.60 14,967 54,580
550.50 5,441 2,506 555.70 15,152 56,086
550.60 5,612 3,059 555.80 15,336 57,610
550.70 5,784 3,628 555.90 15,521 59,153
550.80 5,955 4,215 556.00 15,706 60,715
550.90 6,126 4,819 556.10 15,897 62,295
551.00 6,298 5,441 556.20 16,087 63,894
551.10 6,487 6,080 556.30 16,277 65,512
551.20 6,676 6,738 556.40 16,468 67,149
551.30 6,865 7,415 556.50 16,659 68,806
551.40 7,054 8,111 556.60 16,849 70,481
551.50 7,243 8,826 556.70 17,040 72,175
551.60 7,431 9,559 556.80 17,230 73,889
551.70 7,620 10,312 556.90 17,420 75,621
551.80 7,809 11,083 557.00 17,611 77,373
551.90 7,998 11,874 557.10 17,807 79,144
552.00 8,187 12,683 557.20 18,004 80,934
552.10 8,384 13,512 557.30 18,200 82,745
552.20 8,581 14,360 557.40 18,397 84,575
552.30 8,778 15,228 557.50 18,593 86,424
552.40 8,975 16,115 557.60 18,789 88,293
552.50 9,173 17,023 557.70 18,986 90,182
552.60 9,370 17,950 557.80 19,182 92,090
552.70 9,567 18,897 557.90 19,379 94,018
552.80 9,764 19,863 558.00 19,575 95,966
552.90 9,961 20,850
553.00 10,158 21,856
553.10 10,349 22,881
553.20 10,540 23,925
553.30 10,731 24,989
553.40 10,922 26,072
553.50 11,114 27,173
553.60 11,305 28,294
553.70 11,496 29,434
553.80 11,687 30,593
553.90 11,878 31,772
554.00 12,069 32,969
554.10 12,248 34,185
554.20 12,427 35,419
554.30 12,606 36,670
554.40 12,785 37,940
554.50 12,964 39,227
554.60 13,142 40,532
554.70 13,321 41,856
554.80 13,500 43,197
554.90 13,679 44,556
555.00 13,858 45,933
555.10 14,043 47,328

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 117
Summary for Pond BMP-1: BMP #1
Inflow Area = 28.009 ac, 50.36% Impervious, Inflow Depth = 3.24" for 25-yr-6hr event
Inflow = 154.57 cfs @ 3.15 hrs, Volume= 7.558 af
Outflow = 92.79 cfs @ 3.30 hrs, Volume= 7.558 af, Atten= 40%, Lag= 9.5 min
Primary = 92.79 cfs @ 3.30 hrs, Volume= 7.558 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 558.93' @ 3.30 hrs Surf.Area= 48,207 sf Storage= 143,553 cf
Plug-Flow detention time= 339.8 min calculated for 7.558 af(100% of inflow)
Center-of-Mass det. time= 339.5 min ( 545.5 - 206.1 )
Volume Invert Avail.Storage Storage Description
#1 555.50' 223,972 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
555.50 34,578 0 0
556.00 37,559 18,034 18,034
557.00 41,209 39,384 57,418
558.00 44,809 43,009 100,427
559.00 48,473 46,641 147,068
560.00 52,204 50,339 197,407
560.50 54,057 26,565 223,972
Device Routing Invert Outlet Devices
#1 Primary 550.00' 36.0" Round RCP_Round 36"
L= 115.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 550.00' / 548.00' S= 0.0174 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 7.07 sf
#2 Device 1 555.50' 4.0" Horiz. WQ/CP Orifice C= 0.600
Limited to weir flow at low heads
#3 Device 1 557.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 2.00 2.00
#4 Device 1 557.50' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 559.00' 20.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 118
Primary OutFlow Max=92.70 cfs © 3.30 hrs HW=558.92' (Free Discharge)
L1=RCP_Round 36" (Inlet Controls 92.70 cfs @ 13.11 fps)
2=WQ/CP Orifice (Passes < 0.78 cfs potential flow)
3=Custom Weir/Orifice (Passes < 6.34 cfs potential flow)
4=Riser (Passes < 88.39 cfs potential flow)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=555.50' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-1: BMP #1
Hydrograph
A— t H t l T T I T I—I —It T T I ❑Inflow
154.57 cfs - 3 outflow
H T 1 T T 1 T 1 T Wif lAie =2$I.OS
170 Lo
ndary
160. T T T 1 T T T 11 TI Telalci Ete1► 5 .1a3I'
150"140E./
! T T T I T T I s°rag _�1144154 rf
1
120,--
1 92 79 cfs f T T T H T 1 T T T T
1o03- T T TIT T 11 IT T1 11 TI _
�, 9ov
LL8o 1TT ITT ITT TTI
60 T T TIT T T ITT TTI
504/
40 r —1 I I — 1 I-1 1 — ' I I
/ 420" / / / /// //
0.00 cfs ///////////////////////
o ff?'((( , , ,
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 119
Pond BMP-1: BMP #1
Stage-Discharge
0 Total
0 Primary
❑Secondary
560
Broad-Crested Rectan.ular Weir �`
559 /
0 558
•; % j Riser
w / Custom Weir/Orifice
557
556 % WQ/CP Orifice
0 20 40 60 80 100 120 140 160 180
Discharge (cfs)
Pond BMP-1: BMP #1
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 0 Surfacel
❑Storage
560
///
559
///
0558 II
m
W II
557
- I I I
556-'
Custom Stage Data
0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 220,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 120
Hydrograph for Pond BMP-1: BMP #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 555.50 0.00 0.00 0.00
5.00 6.47 86,437 557.68 7.95 7.95 0.00
10.00 0.00 60,563 557.08 0.67 0.67 0.00
15.00 0.00 51,120 556.85 0.49 0.49 0.00
20.00 0.00 42,699 556.64 0.45 0.45 0.00
25.00 0.00 34,996 556.44 0.41 0.41 0.00
30.00 0.00 28,022 556.26 0.37 0.37 0.00
35.00 0.00 21,791 556.10 0.33 0.33 0.00
40.00 0.00 16,315 555.95 0.28 0.28 0.00
45.00 0.00 11,607 555.83 0.24 0.24 0.00
50.00 0.00 7,682 555.72 0.20 0.20 0.00
55.00 0.00 4,577 555.63 0.14 0.14 0.00
60.00 0.00 2,651 555.58 0.07 0.07 0.00
65.00 0.00 1,690 555.55 0.04 0.04 0.00
70.00 0.00 1,136 555.53 0.03 0.03 0.00
75.00 0.00 764 555.52 0.02 0.02 0.00
80.00 0.00 514 555.51 0.01 0.01 0.00
85.00 0.00 345 555.51 0.01 0.01 0.00
90.00 0.00 232 555.51 0.01 0.01 0.00
95.00 0.00 156 555.50 0.00 0.00 0.00
100.00 0.00 105 555.50 0.00 0.00 0.00
105.00 0.00 71 555.50 0.00 0.00 0.00
110.00 0.00 47 555.50 0.00 0.00 0.00
115.00 0.00 32 555.50 0.00 0.00 0.00
120.00 0.00 21 555.50 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 121
Stage-Discharge for Pond BMP-1: BMP #1
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
555.50 0.00 0.00 0.00 558.10 29.51 29.51 0.00
555.55 0.04 0.04 0.00 558.15 32.75 32.75 0.00
555.60 0.11 0.11 0.00 558.20 36.11 36.11 0.00
555.65 0.16 0.16 0.00 558.25 39.58 39.58 0.00
555.70 0.19 0.19 0.00 558.30 43.16 43.16 0.00
555.75 0.21 0.21 0.00 558.35 46.85 46.85 0.00
555.80 0.23 0.23 0.00 558.40 50.64 50.64 0.00
555.85 0.25 0.25 0.00 558.45 54.54 54.54 0.00
555.90 0.27 0.27 0.00 558.50 58.53 58.53 0.00
555.95 0.28 0.28 0.00 558.55 62.62 62.62 0.00
556.00 0.30 0.30 0.00 558.60 66.80 66.80 0.00
556.05 0.31 0.31 0.00 558.65 71.07 71.07 0.00
556.10 0.33 0.33 0.00 558.70 75.44 75.44 0.00
556.15 0.34 0.34 0.00 558.75 79.89 79.89 0.00
556.20 0.35 0.35 0.00 558.80 84.42 84.42 0.00
556.25 0.36 0.36 0.00 558.85 89.04 89.04 0.00
556.30 0.38 0.38 0.00 558.90 92.59 92.59 0.00
556.35 0.39 0.39 0.00 558.95 92.90 92.90 0.00
556.40 0.40 0.40 0.00 559.00 93.21 93.21 0.00
556.45 0.41 0.41 0.00 559.05 94.12 93.52 0.60
556.50 0.42 0.42 0.00 559.10 95.52 93.83 1.69
556.55 0.43 0.43 0.00 559.15 97.25 94.14 3.11
556.60 0.44 0.44 0.00 559.20 99.24 94.44 4.79
556.65 0.45 0.45 0.00 559.25 101.46 94.75 6.71
556.70 0.46 0.46 0.00 559.30 103.90 95.05 8.84
556.75 0.47 0.47 0.00 559.35 106.52 95.36 11.16
556.80 0.48 0.48 0.00 559.40 109.32 95.66 13.66
556.85 0.49 0.49 0.00 559.45 112.27 95.96 16.30
556.90 0.50 0.50 0.00 559.50 115.36 96.27 19.09
556.95 0.51 0.51 0.00 559.55 118.59 96.57 22.03
557.00 0.51 0.51 0.00 559.60 121.96 96.87 25.10
557.05 0.60 0.60 0.00 559.65 125.31 97.16 28.14
557.10 0.74 0.74 0.00 559.70 128.74 97.46 31.27
557.15 0.92 0.92 0.00 559.75 132.25 97.76 34.49
557.20 1.13 1.13 0.00 559.80 135.83 98.05 37.78
557.25 1.37 1.37 0.00 559.85 139.69 98.35 41.34
557.30 1.64 1.64 0.00 559.90 143.64 98.64 45.00
557.35 1.93 1.93 0.00 559.95 147.69 98.94 48.75
557.40 2.24 2.24 0.00 560.00 151.83 99.23 52.60
557.45 2.56 2.56 0.00 560.05 156.17 99.52 56.65
557.50 2.91 2.91 0.00 560.10 160.61 99.81 60.80
557.55 3.79 3.79 0.00 560.15 165.15 100.10 65.05
557.60 5.10 5.10 0.00 560.20 169.80 100.39 69.41
557.65 6.71 6.71 0.00 560.25 174.47 100.68 73.79
557.70 8.55 8.55 0.00 560.30 179.23 100.96 78.26
557.75 10.61 10.61 0.00 560.35 184.07 101.25 82.82
557.80 12.84 12.84 0.00 560.40 189.00 101.54 87.46
557.85 15.25 15.25 0.00 560.45 193.92 101.82 92.10
557.90 17.82 17.82 0.00 560.50 198.92 102.11 96.82
557.95 20.54 20.54 0.00
558.00 23.40 23.40 0.00
558.05 26.39 26.39 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 122
Stage-Area-Storage for Pond BMP-1: BMP #1
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
555.50 34,578 0 558.10 45,175 104,926
555.55 34,876 1,736 558.15 45,359 107,190
555.60 35,174 3,488 558.20 45,542 109,462
555.65 35,472 5,254 558.25 45,725 111,744
555.70 35,770 7,035 558.30 45,908 114,035
555.75 36,069 8,831 558.35 46,091 116,335
555.80 36,367 10,642 558.40 46,275 118,644
555.85 36,665 12,467 558.45 46,458 120,962
555.90 36,963 14,308 558.50 46,641 123,290
555.95 37,261 16,164 558.55 46,824 125,626
556.00 37,559 18,034 558.60 47,007 127,972
556.05 37,741 19,917 558.65 47,191 130,327
556.10 37,924 21,808 558.70 47,374 132,691
556.15 38,106 23,709 558.75 47,557 135,065
556.20 38,289 25,619 558.80 47,740 137,447
556.25 38,472 27,538 558.85 47,923 139,839
556.30 38,654 29,466 558.90 48,107 142,239
556.35 38,837 31,403 558.95 48,290 144,649
556.40 39,019 33,350 559.00 48,473 147,068
556.45 39,202 35,305 559.05 48,660 149,497
556.50 39,384 37,270 559.10 48,846 151,934
556.55 39,566 39,244 559.15 49,033 154,381
556.60 39,749 41,227 559.20 49,219 156,837
556.65 39,931 43,219 559.25 49,406 159,303
556.70 40,114 45,220 559.30 49,592 161,778
556.75 40,297 47,230 559.35 49,779 164,262
556.80 40,479 49,249 559.40 49,965 166,756
556.85 40,662 51,278 559.45 50,152 169,259
556.90 40,844 53,316 559.50 50,339 171,771
556.95 41,027 55,362 559.55 50,525 174,293
557.00 41,209 57,418 559.60 50,712 176,824
557.05 41,389 59,483 559.65 50,898 179,364
557.10 41,569 61,557 559.70 51,085 181,913
557.15 41,749 63,640 559.75 51,271 184,472
557.20 41,929 65,732 559.80 51,458 187,041
557.25 42,109 67,833 559.85 51,644 189,618
557.30 42,289 69,943 559.90 51,831 192,205
557.35 42,469 72,062 559.95 52,017 194,801
557.40 42,649 74,190 560.00 52,204 197,407
557.45 42,829 76,327 560.05 52,389 200,022
557.50 43,009 78,473 560.10 52,575 202,646
557.55 43,189 80,628 560.15 52,760 205,279
557.60 43,369 82,792 560.20 52,945 207,922
557.65 43,549 84,965 560.25 53,131 210,574
557.70 43,729 87,147 560.30 53,316 213,235
557.75 43,909 89,338 560.35 53,501 215,905
557.80 44,089 91,537 560.40 53,686 218,585
557.85 44,269 93,746 560.45 53,872 221,274
557.90 44,449 95,964 560.50 54,057 223,972
557.95 44,629 98,191
558.00 44,809 100,427
558.05 44,992 102,672

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 123
Summary for Pond BMP-2: BMP #2
Inflow Area = 6.846 ac, 45.49% Impervious, Inflow Depth = 3.14" for 25-yr-6hr event
Inflow = 36.82 cfs @ 3.15 hrs, Volume= 1.791 af
Outflow = 24.43 cfs @ 3.31 hrs, Volume= 1.791 af, Atten= 34%, Lag= 9.6 min
Primary = 24.43 cfs @ 3.31 hrs, Volume= 1.791 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 578.51' @ 3.31 hrs Surf.Area= 13,143 sf Storage= 36,359 cf
Plug-Flow detention time= 869.4 min calculated for 1.791 af(100% of inflow)
Center-of-Mass det. time= 869.3 min ( 1,076.3 - 207.0 )
Volume Invert Avail.Storage Storage Description
#1 575.00' 57,570 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
575.00 7,651 0 0
576.00 9,115 8,383 8,383
577.00 10,693 9,904 18,287
577.50 11,523 5,554 23,841
578.00 12,385 5,977 29,818
579.00 13,864 13,125 42,943
580.00 15,391 14,628 57,570
Device Routing Invert Outlet Devices
#1 Primary 574.40' 24.0" Round RCP Round 24"
L= 88.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 574.40' / 574.00' S= 0.0045 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 575.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 577.50' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 3.00 3.00
#4 Device 1 578.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 579.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 124
Primary OutFlow Max=24.73 cfs © 3.31 hrs HW=578.50' (Free Discharge)
L1=RCP_Round 24" (Barrel Controls 24.73 cfs @ 7.87 fps)
2=Sand Filter (Passes < 0.08 cfs potential flow)
3=Custom Weir/Orifice (Passes < 6.34 cfs potential flow)
4=Riser (Passes < 18.37 cfs potential flow)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=575.00' (Free Discharge)
AtS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-2: BMP #2
Hydrograph
A -H I - ]— 4 I , I , 4 1-1 H- _ ■Inflow
36.82 cfs I I tbfie w-A� la ■Primarimae .646 _ ■Primary
/
/ -
■Secondary
40
38 / I I I I -L Peak �Vi5/-O.54' -
36=� /
34 EY / fi I -t Stota =36359-cf -
32✓7d d'Q rf
2 24.43 cfs I I I I
26 — -
w 24 -H I 1— H —I -H I - f 1—I H I -
2iI.
22
�18�
16
12
10 I I I 1 I I
8/
6 Z
AJZ
0.00 cfs
o , , , , , / // / , ,
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 125
Pond BMP-2: BMP #2
Stage-Discharge
❑Total
❑Primary
581
�'' ❑Secondary
580
Broad-Crested Rectangular Weir
579
Riser
0 578 Custom Weir/Orifice
w 577
576
Sand Filter /
0 10 20 30 40 50 60 70 80 90 100
Discharge (cfs)
Pond BMP-2: BMP #2
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 Surface
` . ( ❑Storage
581
580:-/
i
579:-/
I I
w 577� i ////���� II
576-
_ J J
Custom Stage Data
575 , , , , , , , ,
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 126
Hydrograph for Pond BMP-2: BMP #2
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 575.00 0.00 0.00 0.00
5.00 1.56 27,826 577.84 2.01 2.01 0.00
10.00 0.00 23,440 577.47 0.08 0.08 0.00
15.00 0.00 21,982 577.34 0.08 0.08 0.00
20.00 0.00 20,524 577.21 0.08 0.08 0.00
25.00 0.00 19,066 577.07 0.08 0.08 0.00
30.00 0.00 17,608 576.94 0.08 0.08 0.00
35.00 0.00 16,150 576.80 0.08 0.08 0.00
40.00 0.00 14,692 576.65 0.08 0.08 0.00
45.00 0.00 13,234 576.51 0.08 0.08 0.00
50.00 0.00 11,776 576.36 0.08 0.08 0.00
55.00 0.00 10,318 576.21 0.08 0.08 0.00
60.00 0.00 8,860 576.05 0.08 0.08 0.00
65.00 0.00 7,402 575.89 0.08 0.08 0.00
70.00 0.00 5,944 575.73 0.08 0.08 0.00
75.00 0.00 4,486 575.56 0.08 0.08 0.00
80.00 0.00 3,028 575.38 0.08 0.08 0.00
85.00 0.00 1,570 575.20 0.08 0.08 0.00
90.00 0.00 112 575.01 0.08 0.08 0.00
95.00 0.00 0 575.00 0.00 0.00 0.00
100.00 0.00 0 575.00 0.00 0.00 0.00
105.00 0.00 0 575.00 0.00 0.00 0.00
110.00 0.00 0 575.00 0.00 0.00 0.00
115.00 0.00 0 575.00 0.00 0.00 0.00
120.00 0.00 0 575.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 127
Stage-Discharge for Pond BMP-2: BMP #2
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
575.00 0.00 0.00 0.00 580.20 66.77 32.06 34.70
575.10 0.08 0.08 0.00 580.30 71.57 32.44 39.13
575.20 0.08 0.08 0.00 580.40 76.55 32.82 43.73
575.30 0.08 0.08 0.00 580.50 81.60 33.19 48.41
575.40 0.08 0.08 0.00 580.60 86.78 33.55 53.23
575.50 0.08 0.08 0.00 580.70 92.21 33.92 58.29
575.60 0.08 0.08 0.00 580.80 97.79 34.28 63.51
575.70 0.08 0.08 0.00 580.90 103.51 34.63 68.88
575.80 0.08 0.08 0.00 581.00 109.37 34.98 74.39
575.90 0.08 0.08 0.00
576.00 0.08 0.08 0.00
576.10 0.08 0.08 0.00
576.20 0.08 0.08 0.00
576.30 0.08 0.08 0.00
576.40 0.08 0.08 0.00
576.50 0.08 0.08 0.00
576.60 0.08 0.08 0.00
576.70 0.08 0.08 0.00
576.80 0.08 0.08 0.00
576.90 0.08 0.08 0.00
577.00 0.08 0.08 0.00
577.10 0.08 0.08 0.00
577.20 0.08 0.08 0.00
577.30 0.08 0.08 0.00
577.40 0.08 0.08 0.00
577.50 0.08 0.08 0.00
577.60 0.39 0.39 0.00
577.70 0.96 0.96 0.00
577.80 1.70 1.70 0.00
577.90 2.57 2.57 0.00
578.00 3.55 3.55 0.00
578.10 5.99 5.99 0.00
578.20 9.64 9.64 0.00
578.30 14.09 14.09 0.00
578.40 19.22 19.22 0.00
578.50 24.74 24.74 0.00
578.60 25.23 25.23 0.00
578.70 25.71 25.71 0.00
578.80 26.18 26.18 0.00
578.90 26.64 26.64 0.00
579.00 27.10 27.10 0.00
579.10 28.39 27.55 0.85
579.20 30.38 27.99 2.40
579.30 32.84 28.42 4.42
579.40 35.68 28.85 6.83
579.50 38.82 29.27 9.55
579.60 42.23 29.68 12.55
579.70 45.73 30.09 15.64
579.80 49.39 30.50 18.89
579.90 53.39 30.90 22.50
580.00 57.59 31.29 26.30
580.10 62.08 31.68 30.40

Detention
Davis Village Charlotte 6-hr 25-yr 25-yr-6hr Rainfall=4.44"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 128
Stage-Area-Storage for Pond BMP-2: BMP #2
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
575.00 7,651 0 580.20 15,391 57,570
575.10 7,797 772 580.30 15,391 57,570
575.20 7,944 1,559 580.40 15,391 57,570
575.30 8,090 2,361 580.50 15,391 57,570
575.40 8,237 3,178 580.60 15,391 57,570
575.50 8,383 4,009 580.70 15,391 57,570
575.60 8,529 4,854 580.80 15,391 57,570
575.70 8,676 5,714 580.90 15,391 57,570
575.80 8,822 6,589 581.00 15,391 57,570
575.90 8,969 7,479
576.00 9,115 8,383
576.10 9,273 9,302
576.20 9,431 10,238
576.30 9,588 11,189
576.40 9,746 12,155
576.50 9,904 13,138
576.60 10,062 14,136
576.70 10,220 15,150
576.80 10,377 16,180
576.90 10,535 17,226
577.00 10,693 18,287
577.10 10,859 19,365
577.20 11,025 20,459
577.30 11,191 21,570
577.40 11,357 22,697
577.50 11,523 23,841
577.60 11,695 25,002
577.70 11,868 26,180
577.80 12,040 27,375
577.90 12,213 28,588
578.00 12,385 29,818
578.10 12,533 31,064
578.20 12,681 32,325
578.30 12,829 33,600
578.40 12,977 34,890
578.50 13,125 36,195
578.60 13,272 37,515
578.70 13,420 38,850
578.80 13,568 40,199
578.90 13,716 41,563
579.00 13,864 42,943
579.10 14,017 44,337
579.20 14,169 45,746
579.30 14,322 47,170
579.40 14,475 48,610
579.50 14,628 50,065
579.60 14,780 51,536
579.70 14,933 53,021
579.80 15,086 54,522
579.90 15,238 56,039
580.00 15,391 57,570
580.10 15,391 57,570

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 129
Time span=0.00-120.00 hrs, dt=0.10 hrs, 1201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA#1: Post-Development Runoff Area=28.009 ac 50.36% Impervious Runoff Depth=3.76"
Tc=5.0 min CN=89 Runoff=175.14 cfs 8.782 of
Subcatchment DA#2: Post-Development Runoff Area=6.846 ac 45.49% Impervious Runoff Depth=3.66"
Tc=5.0 min CN=88 Runoff=41.87 cfs 2.088 af
Subcatchment DA#3: Post-Development Runoff Area=4.651 ac 56.27% Impervious Runoff Depth=3.87"
Tc=5.0 min CN=90 Runoff=29.70 cfs 1.499 af
Subcatchment PRE#1: Predevelopment#1 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=3.26"
Tc=29.5 min CN=84 Runoff=95.53 cfs 7.612 of
Subcatchment PRE#2: Predevelopment#2 Runoff Area=6.846 ac 0.00% Impervious Runoff Depth=3.26"
Tc=31.9 min CN=84 Runoff=22.48 cfs 1.861 af
SubcatchmentPRE#3: Predevelopment#3 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=3.26"
Tc=31.9 min CN=84 Runoff=91.96 cfs 7.612 of
Pond BMP#3: BMP#3 Peak Elev=554.24' Storage=35,860 cf Inflow=29.70 cfs 1.499 af
Primary=13.33 cfs 1.499 af Secondary=0.00 cfs 0.000 af Outflow=13.33 cfs 1.499 af
Pond BMP-1: BMP#1 Peak Elev=559.26' Storage=159,857 cf Inflow=175.14 cfs 8.782 af
Primary=94.82 cfs 8.708 af Secondary=7.19 cfs 0.073 af Outflow=102.01 cfs 8.781 af
Pond BMP-2: BMP#2 Peak Elev=578.73' Storage=39,289 cf Inflow=41.87 cfs 2.088 af
Primary=25.89 cfs 2.088 af Secondary=0.00 cfs 0.000 af Outflow=25.89 cfs 2.088 af
Total Runoff Area = 102.372 ac Runoff Volume = 29.453 af Average Runoff Depth = 3.45"
80.62% Pervious = 82.537 ac 19.38% Impervious = 19.835 ac

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 130
Summary for Subcatchment DA#1: Post-Development Pond #1
Runoff = 175.14 cfs @ 3.15 hrs, Volume= 8.782 af, Depth= 3.76"
Routed to Pond BMP-1 : BMP #1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Area (ac) CN Description
• 3.238 98 Roadway
• 1.043 98 Sidewalk
• 9.823 98 Buildings/Driveways
13.905 80 >75% Grass cover, Good, HSG D
28.009 89 Weighted Average
13.905 49.64% Pervious Area
14.104 50.36% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#1: Post-Development Pond #1
Hydrograph
III I
0 Runoff
17. cfs 4- I I H I I H 1- I I H I � I 1 r
170� a lotte 6Jlr 5U-�
150
140-V — — Rtaio# A-rea-t28 01A9 aI�
130
120H 1R4nnPV914n1le •Ta
w 110_
100 R rI pt, 76-
3 �
90= — — — — — — — — c5.A-rn+n
LL
70= — — — — — — — • —
60= H H H H H 1• H
50i
40 1 H I- H 1 H H 1 H H I I H
30
20
,( ,/f(/�//l��ff��f(�ff (
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 131
Hydrograph for Subcatchment DA#1: Post-Development Pond #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.99 3.76 0.00
2.00 0.56 0.06 4.24 106.00 4.99 3.76 0.00
4.00 4.39 3.19 17.81 108.00 4.99 3.76 0.00
6.00 4.99 3.76 5.19 110.00 4.99 3.76 0.00
8.00 4.99 3.76 0.00 112.00 4.99 3.76 0.00
10.00 4.99 3.76 0.00 114.00 4.99 3.76 0.00
12.00 4.99 3.76 0.00 116.00 4.99 3.76 0.00
14.00 4.99 3.76 0.00 118.00 4.99 3.76 0.00
16.00 4.99 3.76 0.00 120.00 4.99 3.76 0.00
18.00 4.99 3.76 0.00
20.00 4.99 3.76 0.00
22.00 4.99 3.76 0.00
24.00 4.99 3.76 0.00
26.00 4.99 3.76 0.00
28.00 4.99 3.76 0.00
30.00 4.99 3.76 0.00
32.00 4.99 3.76 0.00
34.00 4.99 3.76 0.00
36.00 4.99 3.76 0.00
38.00 4.99 3.76 0.00
40.00 4.99 3.76 0.00
42.00 4.99 3.76 0.00
44.00 4.99 3.76 0.00
46.00 4.99 3.76 0.00
48.00 4.99 3.76 0.00
50.00 4.99 3.76 0.00
52.00 4.99 3.76 0.00
54.00 4.99 3.76 0.00
56.00 4.99 3.76 0.00
58.00 4.99 3.76 0.00
60.00 4.99 3.76 0.00
62.00 4.99 3.76 0.00
64.00 4.99 3.76 0.00
66.00 4.99 3.76 0.00
68.00 4.99 3.76 0.00
70.00 4.99 3.76 0.00
72.00 4.99 3.76 0.00
74.00 4.99 3.76 0.00
76.00 4.99 3.76 0.00
78.00 4.99 3.76 0.00
80.00 4.99 3.76 0.00
82.00 4.99 3.76 0.00
84.00 4.99 3.76 0.00
86.00 4.99 3.76 0.00
88.00 4.99 3.76 0.00
90.00 4.99 3.76 0.00
92.00 4.99 3.76 0.00
94.00 4.99 3.76 0.00
96.00 4.99 3.76 0.00
98.00 4.99 3.76 0.00
100.00 4.99 3.76 0.00
102.00 4.99 3.76 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 132
Summary for Subcatchment DA#2: Post-Development Pond #2
Runoff = 41.87 cfs @ 3.15 hrs, Volume= 2.088 af, Depth= 3.66"
Routed to Pond BMP-2 : BMP #2
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Area (ac) CN Description
• 1.262 98 Roadway
• 0.445 98 Sidewalk
• 0.964 98 Buildings/Driveways
3.732 80 >75% Grass cover, Good, HSG D
• 0.443 98 Amenity Impervious
6.846 88 Weighted Average
3.732 54.51% Pervious Area
3.114 45.49% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#2: Post-Development Pond #2
Hydrograph
AR _ I ■Runoff
41.87 cfs
40 j Char�toite
338-
6 5�y�r=�hr Raiff II 4.199{"
34_ SROn3fftAk-_ea i8.846 -
32
30
28 4 A � npff VI9me .. 8$ f
_
w 264 .24 n
/ 7 _ 7 7 t !Rnff I� p-'' .
° 22_ Tc=S$ mltn
213
181
V 1L.8�
16= ��1O
14_ / I # 4 H 1— I
12_" —
6
4
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 133
Hydrograph for Subcatchment DA#2: Post-Development Pond #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.99 3.66 0.00
2.00 0.56 0.05 0.90 106.00 4.99 3.66 0.00
4.00 4.39 3.09 4.31 108.00 4.99 3.66 0.00
6.00 4.99 3.66 1.26 110.00 4.99 3.66 0.00
8.00 4.99 3.66 0.00 112.00 4.99 3.66 0.00
10.00 4.99 3.66 0.00 114.00 4.99 3.66 0.00
12.00 4.99 3.66 0.00 116.00 4.99 3.66 0.00
14.00 4.99 3.66 0.00 118.00 4.99 3.66 0.00
16.00 4.99 3.66 0.00 120.00 4.99 3.66 0.00
18.00 4.99 3.66 0.00
20.00 4.99 3.66 0.00
22.00 4.99 3.66 0.00
24.00 4.99 3.66 0.00
26.00 4.99 3.66 0.00
28.00 4.99 3.66 0.00
30.00 4.99 3.66 0.00
32.00 4.99 3.66 0.00
34.00 4.99 3.66 0.00
36.00 4.99 3.66 0.00
38.00 4.99 3.66 0.00
40.00 4.99 3.66 0.00
42.00 4.99 3.66 0.00
44.00 4.99 3.66 0.00
46.00 4.99 3.66 0.00
48.00 4.99 3.66 0.00
50.00 4.99 3.66 0.00
52.00 4.99 3.66 0.00
54.00 4.99 3.66 0.00
56.00 4.99 3.66 0.00
58.00 4.99 3.66 0.00
60.00 4.99 3.66 0.00
62.00 4.99 3.66 0.00
64.00 4.99 3.66 0.00
66.00 4.99 3.66 0.00
68.00 4.99 3.66 0.00
70.00 4.99 3.66 0.00
72.00 4.99 3.66 0.00
74.00 4.99 3.66 0.00
76.00 4.99 3.66 0.00
78.00 4.99 3.66 0.00
80.00 4.99 3.66 0.00
82.00 4.99 3.66 0.00
84.00 4.99 3.66 0.00
86.00 4.99 3.66 0.00
88.00 4.99 3.66 0.00
90.00 4.99 3.66 0.00
92.00 4.99 3.66 0.00
94.00 4.99 3.66 0.00
96.00 4.99 3.66 0.00
98.00 4.99 3.66 0.00
100.00 4.99 3.66 0.00
102.00 4.99 3.66 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 134
Summary for Subcatchment DA#3: Post-Development Pond #3
Runoff = 29.70 cfs @ 3.14 hrs, Volume= 1.499 af, Depth= 3.87"
Routed to Pond BMP#3 : BMP #3
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Area (ac) CN Description
• 0.677 98 Roadway
• 0.221 98 Sidewalk
• 1.481 98 Buildings/Driveways
2.034 80 >75% Grass cover, Good, HSG D
• 0.203 98 Parking
• 0.035 98 Ex. Impervious
4.651 90 Weighted Average
2.034 43.73% Pervious Area
2.617 56.27% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#3: Post-Development Pond #3
Hydrograph
' I ■Runoff
29.70 cfsJU
28- V 6-r arioite 649-56-yr
26- 56 ylr 6hrrRaiii611 .J9"
24_ 1ROnofff-Area=4.651 Z b
22=
20 —Rntif Vlume1. 91f18
0 16= I _F 7 7 7 nc!ff Depth=-3. "
14 Tc=5 O min
12= di J4
10='
o
4=
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 135
Hydrograph for Subcatchment DA#3: Post-Development Pond #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.99 3.87 0.00
2.00 0.56 0.08 0.81 106.00 4.99 3.87 0.00
4.00 4.39 3.29 2.98 108.00 4.99 3.87 0.00
6.00 4.99 3.87 0.87 110.00 4.99 3.87 0.00
8.00 4.99 3.87 0.00 112.00 4.99 3.87 0.00
10.00 4.99 3.87 0.00 114.00 4.99 3.87 0.00
12.00 4.99 3.87 0.00 116.00 4.99 3.87 0.00
14.00 4.99 3.87 0.00 118.00 4.99 3.87 0.00
16.00 4.99 3.87 0.00 120.00 4.99 3.87 0.00
18.00 4.99 3.87 0.00
20.00 4.99 3.87 0.00
22.00 4.99 3.87 0.00
24.00 4.99 3.87 0.00
26.00 4.99 3.87 0.00
28.00 4.99 3.87 0.00
30.00 4.99 3.87 0.00
32.00 4.99 3.87 0.00
34.00 4.99 3.87 0.00
36.00 4.99 3.87 0.00
38.00 4.99 3.87 0.00
40.00 4.99 3.87 0.00
42.00 4.99 3.87 0.00
44.00 4.99 3.87 0.00
46.00 4.99 3.87 0.00
48.00 4.99 3.87 0.00
50.00 4.99 3.87 0.00
52.00 4.99 3.87 0.00
54.00 4.99 3.87 0.00
56.00 4.99 3.87 0.00
58.00 4.99 3.87 0.00
60.00 4.99 3.87 0.00
62.00 4.99 3.87 0.00
64.00 4.99 3.87 0.00
66.00 4.99 3.87 0.00
68.00 4.99 3.87 0.00
70.00 4.99 3.87 0.00
72.00 4.99 3.87 0.00
74.00 4.99 3.87 0.00
76.00 4.99 3.87 0.00
78.00 4.99 3.87 0.00
80.00 4.99 3.87 0.00
82.00 4.99 3.87 0.00
84.00 4.99 3.87 0.00
86.00 4.99 3.87 0.00
88.00 4.99 3.87 0.00
90.00 4.99 3.87 0.00
92.00 4.99 3.87 0.00
94.00 4.99 3.87 0.00
96.00 4.99 3.87 0.00
98.00 4.99 3.87 0.00
100.00 4.99 3.87 0.00
102.00 4.99 3.87 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 136
Summary for Subcatchment PRE#1: Predevelopment #1
Runoff = 95.53 cfs @ 3.48 hrs, Volume= 7.612 af, Depth= 3.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
29.5 Direct Entry,
Subcatchment PRE#1: Predevelopment #1
Hydrograph
1 nF (1 _ 0 Runoff
95.53 cfs 1— 1
95 fi l 1 barot;6r 5-6- r
90
85V 4 I I I 5d—i--ihrrR fa I §0
8ov
75=/ I I I I Rurho# Area-21.O1-0 ad
70
3 551 1 -1 ± 1- 1 I ± 1R nr 11 7 F
6:7
,o 50 TC= .5-min
45=
40K —L 1- 1 1 1rt 1- 11 td1-L
35
30V 1 — 1 1-1 1 1 i
25V 0
207 z,�� 1 1 1 1 1 4 I 1
15=
10 �� I
�o
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 137
Hydrograph for Subcatchment PRE#1: Predevelopment #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.99 3.26 0.00
2.00 0.56 0.02 0.29 106.00 4.99 3.26 0.00
4.00 4.39 2.71 34.62 108.00 4.99 3.26 0.00
6.00 4.99 3.26 5.81 110.00 4.99 3.26 0.00
8.00 4.99 3.26 0.00 112.00 4.99 3.26 0.00
10.00 4.99 3.26 0.00 114.00 4.99 3.26 0.00
12.00 4.99 3.26 0.00 116.00 4.99 3.26 0.00
14.00 4.99 3.26 0.00 118.00 4.99 3.26 0.00
16.00 4.99 3.26 0.00 120.00 4.99 3.26 0.00
18.00 4.99 3.26 0.00
20.00 4.99 3.26 0.00
22.00 4.99 3.26 0.00
24.00 4.99 3.26 0.00
26.00 4.99 3.26 0.00
28.00 4.99 3.26 0.00
30.00 4.99 3.26 0.00
32.00 4.99 3.26 0.00
34.00 4.99 3.26 0.00
36.00 4.99 3.26 0.00
38.00 4.99 3.26 0.00
40.00 4.99 3.26 0.00
42.00 4.99 3.26 0.00
44.00 4.99 3.26 0.00
46.00 4.99 3.26 0.00
48.00 4.99 3.26 0.00
50.00 4.99 3.26 0.00
52.00 4.99 3.26 0.00
54.00 4.99 3.26 0.00
56.00 4.99 3.26 0.00
58.00 4.99 3.26 0.00
60.00 4.99 3.26 0.00
62.00 4.99 3.26 0.00
64.00 4.99 3.26 0.00
66.00 4.99 3.26 0.00
68.00 4.99 3.26 0.00
70.00 4.99 3.26 0.00
72.00 4.99 3.26 0.00
74.00 4.99 3.26 0.00
76.00 4.99 3.26 0.00
78.00 4.99 3.26 0.00
80.00 4.99 3.26 0.00
82.00 4.99 3.26 0.00
84.00 4.99 3.26 0.00
86.00 4.99 3.26 0.00
88.00 4.99 3.26 0.00
90.00 4.99 3.26 0.00
92.00 4.99 3.26 0.00
94.00 4.99 3.26 0.00
96.00 4.99 3.26 0.00
98.00 4.99 3.26 0.00
100.00 4.99 3.26 0.00
102.00 4.99 3.26 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 138
Summary for Subcatchment PRE#2: Predevelopment #2
Runoff = 22.48 cfs @ 3.51 hrs, Volume= 1.861 af, Depth= 3.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Area (ac) CN Description
6.846 84 Pasture/grassland/range, Fair, HSG D
6.846 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#2: Predevelopment #2
Hydrograph
25 - — - •Runoff
22.48 cfs1 -
1 H- H- 1 H H
22 j Ghao #e
20° 1 1 Sly-ylr h Ratnf 11 .J91"
18= / fi 1 —h 1- 1 —[ -h —h fRO ntAll-Aired=6.8I 6-at
15 �/ -4 I-I 4 I- I H- H I n)f I Ie1.Pl f -
13 I1 1 1 1 1 1 1 ! nrICE!ilh9
.1"
0 12_ /
11
10 , ± 1- ± II 4644 _
87=� 0 1 1 1 I I I 1 1 I 1 1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 139
Hydrograph for Subcatchment PRE#2: Predevelopment #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.99 3.26 0.00
2.00 0.56 0.02 0.06 106.00 4.99 3.26 0.00
4.00 4.39 2.71 9.24 108.00 4.99 3.26 0.00
6.00 4.99 3.26 1.44 110.00 4.99 3.26 0.00
8.00 4.99 3.26 0.00 112.00 4.99 3.26 0.00
10.00 4.99 3.26 0.00 114.00 4.99 3.26 0.00
12.00 4.99 3.26 0.00 116.00 4.99 3.26 0.00
14.00 4.99 3.26 0.00 118.00 4.99 3.26 0.00
16.00 4.99 3.26 0.00 120.00 4.99 3.26 0.00
18.00 4.99 3.26 0.00
20.00 4.99 3.26 0.00
22.00 4.99 3.26 0.00
24.00 4.99 3.26 0.00
26.00 4.99 3.26 0.00
28.00 4.99 3.26 0.00
30.00 4.99 3.26 0.00
32.00 4.99 3.26 0.00
34.00 4.99 3.26 0.00
36.00 4.99 3.26 0.00
38.00 4.99 3.26 0.00
40.00 4.99 3.26 0.00
42.00 4.99 3.26 0.00
44.00 4.99 3.26 0.00
46.00 4.99 3.26 0.00
48.00 4.99 3.26 0.00
50.00 4.99 3.26 0.00
52.00 4.99 3.26 0.00
54.00 4.99 3.26 0.00
56.00 4.99 3.26 0.00
58.00 4.99 3.26 0.00
60.00 4.99 3.26 0.00
62.00 4.99 3.26 0.00
64.00 4.99 3.26 0.00
66.00 4.99 3.26 0.00
68.00 4.99 3.26 0.00
70.00 4.99 3.26 0.00
72.00 4.99 3.26 0.00
74.00 4.99 3.26 0.00
76.00 4.99 3.26 0.00
78.00 4.99 3.26 0.00
80.00 4.99 3.26 0.00
82.00 4.99 3.26 0.00
84.00 4.99 3.26 0.00
86.00 4.99 3.26 0.00
88.00 4.99 3.26 0.00
90.00 4.99 3.26 0.00
92.00 4.99 3.26 0.00
94.00 4.99 3.26 0.00
96.00 4.99 3.26 0.00
98.00 4.99 3.26 0.00
100.00 4.99 3.26 0.00
102.00 4.99 3.26 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 140
Summary for Subcatchment PRE#3: Predevelopment #3
Runoff = 91.96 cfs @ 3.51 hrs, Volume= 7.612 af, Depth= 3.26"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#3: Predevelopment #3
Hydrograph
— — 0 Runoff
91.96 cfs 1— 1 1 1 —h 1— 1 J
90 � araott�64ir s3V- r
85✓ d `-- hrainfa�Il��19 '
75/
70i/ fi rt 4 1 14Ruflo#f Area$28 011-Q d`
50 7 171 T 71 71 1 v . ? -q
u 55
45
1=r1FF
. min
LL 814
40 � � �L
35=
30 A 1-
25
10514
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 141
Hydrograph for Subcatchment PRE#3: Predevelopment #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 4.99 3.26 0.00
2.00 0.56 0.02 0.24 106.00 4.99 3.26 0.00
4.00 4.39 2.71 37.79 108.00 4.99 3.26 0.00
6.00 4.99 3.26 5.89 110.00 4.99 3.26 0.00
8.00 4.99 3.26 0.00 112.00 4.99 3.26 0.00
10.00 4.99 3.26 0.00 114.00 4.99 3.26 0.00
12.00 4.99 3.26 0.00 116.00 4.99 3.26 0.00
14.00 4.99 3.26 0.00 118.00 4.99 3.26 0.00
16.00 4.99 3.26 0.00 120.00 4.99 3.26 0.00
18.00 4.99 3.26 0.00
20.00 4.99 3.26 0.00
22.00 4.99 3.26 0.00
24.00 4.99 3.26 0.00
26.00 4.99 3.26 0.00
28.00 4.99 3.26 0.00
30.00 4.99 3.26 0.00
32.00 4.99 3.26 0.00
34.00 4.99 3.26 0.00
36.00 4.99 3.26 0.00
38.00 4.99 3.26 0.00
40.00 4.99 3.26 0.00
42.00 4.99 3.26 0.00
44.00 4.99 3.26 0.00
46.00 4.99 3.26 0.00
48.00 4.99 3.26 0.00
50.00 4.99 3.26 0.00
52.00 4.99 3.26 0.00
54.00 4.99 3.26 0.00
56.00 4.99 3.26 0.00
58.00 4.99 3.26 0.00
60.00 4.99 3.26 0.00
62.00 4.99 3.26 0.00
64.00 4.99 3.26 0.00
66.00 4.99 3.26 0.00
68.00 4.99 3.26 0.00
70.00 4.99 3.26 0.00
72.00 4.99 3.26 0.00
74.00 4.99 3.26 0.00
76.00 4.99 3.26 0.00
78.00 4.99 3.26 0.00
80.00 4.99 3.26 0.00
82.00 4.99 3.26 0.00
84.00 4.99 3.26 0.00
86.00 4.99 3.26 0.00
88.00 4.99 3.26 0.00
90.00 4.99 3.26 0.00
92.00 4.99 3.26 0.00
94.00 4.99 3.26 0.00
96.00 4.99 3.26 0.00
98.00 4.99 3.26 0.00
100.00 4.99 3.26 0.00
102.00 4.99 3.26 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 142
Summary for Pond BMP#3: BMP #3
Inflow Area = 4.651 ac, 56.27% Impervious, Inflow Depth = 3.87" for 50-yr-6hr event
Inflow = 29.70 cfs @ 3.14 hrs, Volume= 1.499 af
Outflow = 13.33 cfs @ 3.35 hrs, Volume= 1.499 af, Atten= 55%, Lag= 12.1 min
Primary = 13.33 cfs @ 3.35 hrs, Volume= 1.499 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 554.24' @ 3.35 hrs Surf.Area= 12,490 sf Storage= 35,860 cf
Plug-Flow detention time= 896.5 min calculated for 1.499 af(100% of inflow)
Center-of-Mass det. time= 896.4 min ( 1,100.7 - 204.3 )
Volume Invert Avail.Storage Storage Description
#1 550.00' 95,966 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
550.00 4,583 0 0
551.00 6,298 5,441 5,441
552.00 8,187 7,243 12,683
553.00 10,158 9,173 21,856
554.00 12,069 11,114 32,969
555.00 13,858 12,964 45,933
556.00 15,706 14,782 60,715
557.00 17,611 16,659 77,373
558.00 19,575 18,593 95,966
Device Routing Invert Outlet Devices
#1 Primary 549.50' 24.0" Round RCP Round 24"
L= 85.0' RCP, square edge headwall, Ke= 0.500
Inlet/Outlet Invert= 549.50' / 548.96' S= 0.0064 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 550.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 553.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 2.00 2.00
#4 Device 1 554.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 556.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 143
Primary OutFlow Max=12.28 cfs © 3.35 hrs HW=554.19' (Free Discharge)
4-1=RCP_Round 24" (Passes 12.28 cfs of 28.31 cfs potential flow)
2=Sand Filter (Custom Controls 0.08 cfs)
3=Custom Weir/Orifice (Orifice Controls 7.95 cfs @ 3.97 fps)
4=Riser (Weir Controls 4.26 cfs © 1.42 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=550.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP#3: BMP #3
Hydrograph
A—) 1 1 - 1 ]— 4 I 11- - I I _ ■Inflow
r29.70 C .Outflow
I I—I 4 I ]— 4 I ibtio jAie 4.6- I. - ■Seco dary
32�
30 1 4 1 - -L Peak Ei evl=55 4.24' -
28 - I -H I - 1— H- -L Sto ta
24V / — - -
22- / I 14- I L H _1 I -
F. 10=1 i;r-4 1 I I _L1_ H _I
0 1� 13.33cfs
214 _LL _ IIi _I1_ 1 -
10 j 1 1
s
6
4
0.00 cfs
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 144
Pond BMP#3: BMP #3
Stage-Discharge
❑Total '
558 ❑Primary
❑Secondary
557 /
/,� Broad-Crested Rectan.ular Weir
556
^ 555 ...d/
.2 /a�' Riser
0 554 '
�III Custom Weir/Orifice
553 %
552
551 / Sand Filter
/
0 10 20 30 40 50 60 70 80 90 100 110
Discharge (cfs)
Pond BMP#3: BMP #3
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 Surface
❑Storage
558_ I I 1 ��� �������
557 I ��� �� I I I
5561/
555 -/ ��/�/ —
- z— II II I //' I I
o 554- , //�/ /� I 41 I
> -
w 553LZ I 4 I I 41 1
552: I I -I I -
5511/ 1
Custom Stage Data
550 ( ,
0 10,,000 20,000 30,000 40,000 50,000 60,,000 70,000 80,000 90,000'
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 145
Hydrograph for Pond BMP#3: BMP #3
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 550.00 0.00 0.00 0.00
5.00 1.26 26,295 553.42 1.87 1.87 0.00
10.00 0.00 21,548 552.97 0.08 0.08 0.00
15.00 0.00 20,090 552.82 0.08 0.08 0.00
20.00 0.00 18,632 552.67 0.08 0.08 0.00
25.00 0.00 17,174 552.52 0.08 0.08 0.00
30.00 0.00 15,716 552.36 0.08 0.08 0.00
35.00 0.00 14,258 552.19 0.08 0.08 0.00
40.00 0.00 12,800 552.01 0.08 0.08 0.00
45.00 0.00 11,342 551.83 0.08 0.08 0.00
50.00 0.00 9,884 551.64 0.08 0.08 0.00
55.00 0.00 8,426 551.44 0.08 0.08 0.00
60.00 0.00 6,968 551.23 0.08 0.08 0.00
65.00 0.00 5,510 551.01 0.08 0.08 0.00
70.00 0.00 4,052 550.77 0.08 0.08 0.00
75.00 0.00 2,594 550.52 0.08 0.08 0.00
80.00 0.00 1,136 550.24 0.08 0.08 0.00
85.00 0.00 0 550.00 0.00 0.00 0.00
90.00 0.00 0 550.00 0.00 0.00 0.00
95.00 0.00 0 550.00 0.00 0.00 0.00
100.00 0.00 0 550.00 0.00 0.00 0.00
105.00 0.00 0 550.00 0.00 0.00 0.00
110.00 0.00 0 550.00 0.00 0.00 0.00
115.00 0.00 0 550.00 0.00 0.00 0.00
120.00 0.00 0 550.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 146
Stage-Discharge for Pond BMP#3: BMP #3
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
550.00 0.00 0.00 0.00 555.20 32.45 32.45 0.00
550.10 0.08 0.08 0.00 555.30 32.83 32.83 0.00
550.20 0.08 0.08 0.00 555.40 33.21 33.21 0.00
550.30 0.08 0.08 0.00 555.50 33.58 33.58 0.00
550.40 0.08 0.08 0.00 555.60 33.95 33.95 0.00
550.50 0.08 0.08 0.00 555.70 34.31 34.31 0.00
550.60 0.08 0.08 0.00 555.80 34.67 34.67 0.00
550.70 0.08 0.08 0.00 555.90 35.03 35.03 0.00
550.80 0.08 0.08 0.00 556.00 35.38 35.38 0.00
550.90 0.08 0.08 0.00 556.10 36.58 35.73 0.85
551.00 0.08 0.08 0.00 556.20 38.47 36.07 2.40
551.10 0.08 0.08 0.00 556.30 40.84 36.42 4.42
551.20 0.08 0.08 0.00 556.40 43.57 36.74 6.83
551.30 0.08 0.08 0.00 556.50 46.60 37.05 9.55
551.40 0.08 0.08 0.00 556.60 49.91 37.36 12.55
551.50 0.08 0.08 0.00 556.70 53.30 37.67 15.64
551.60 0.08 0.08 0.00 556.80 56.86 37.97 18.89
551.70 0.08 0.08 0.00 556.90 60.77 38.27 22.50
551.80 0.08 0.08 0.00 557.00 64.87 38.57 26.30
551.90 0.08 0.08 0.00 557.10 69.26 38.86 30.40
552.00 0.08 0.08 0.00 557.20 73.86 39.15 34.70
552.10 0.08 0.08 0.00 557.30 78.58 39.45 39.13
552.20 0.08 0.08 0.00 557.40 83.47 39.73 43.73
552.30 0.08 0.08 0.00 557.50 88.43 40.02 48.41
552.40 0.08 0.08 0.00 557.60 93.53 40.31 53.23
552.50 0.08 0.08 0.00 557.70 98.88 40.59 58.29
552.60 0.08 0.08 0.00 557.80 104.38 40.87 63.51
552.70 0.08 0.08 0.00 557.90 110.03 41.15 68.88
552.80 0.08 0.08 0.00 558.00 115.81 41.43 74.39
552.90 0.08 0.08 0.00
553.00 0.08 0.08 0.00
553.10 0.29 0.29 0.00
553.20 0.67 0.67 0.00
553.30 1.16 1.16 0.00
553.40 1.74 1.74 0.00
553.50 2.40 2.40 0.00
553.60 3.13 3.13 0.00
553.70 3.92 3.92 0.00
553.80 4.77 4.77 0.00
553.90 5.67 5.67 0.00
554.00 6.63 6.63 0.00
554.10 9.09 9.09 0.00
554.20 12.78 12.78 0.00
554.30 17.31 17.31 0.00
554.40 22.51 22.51 0.00
554.50 28.30 28.30 0.00
554.60 30.07 30.07 0.00
554.70 30.48 30.48 0.00
554.80 30.88 30.88 0.00
554.90 31.28 31.28 0.00
555.00 31.68 31.68 0.00
555.10 32.06 32.06 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 147
Stage-Area-Storage for Pond BMP#3: BMP #3
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
550.00 4,583 0 555.20 14,228 48,741
550.10 4,755 467 555.30 14,412 50,173
550.20 4,926 951 555.40 14,597 51,624
550.30 5,097 1,452 555.50 14,782 53,093
550.40 5,269 1,970 555.60 14,967 54,580
550.50 5,441 2,506 555.70 15,152 56,086
550.60 5,612 3,059 555.80 15,336 57,610
550.70 5,784 3,628 555.90 15,521 59,153
550.80 5,955 4,215 556.00 15,706 60,715
550.90 6,126 4,819 556.10 15,897 62,295
551.00 6,298 5,441 556.20 16,087 63,894
551.10 6,487 6,080 556.30 16,277 65,512
551.20 6,676 6,738 556.40 16,468 67,149
551.30 6,865 7,415 556.50 16,659 68,806
551.40 7,054 8,111 556.60 16,849 70,481
551.50 7,243 8,826 556.70 17,040 72,175
551.60 7,431 9,559 556.80 17,230 73,889
551.70 7,620 10,312 556.90 17,420 75,621
551.80 7,809 11,083 557.00 17,611 77,373
551.90 7,998 11,874 557.10 17,807 79,144
552.00 8,187 12,683 557.20 18,004 80,934
552.10 8,384 13,512 557.30 18,200 82,745
552.20 8,581 14,360 557.40 18,397 84,575
552.30 8,778 15,228 557.50 18,593 86,424
552.40 8,975 16,115 557.60 18,789 88,293
552.50 9,173 17,023 557.70 18,986 90,182
552.60 9,370 17,950 557.80 19,182 92,090
552.70 9,567 18,897 557.90 19,379 94,018
552.80 9,764 19,863 558.00 19,575 95,966
552.90 9,961 20,850
553.00 10,158 21,856
553.10 10,349 22,881
553.20 10,540 23,925
553.30 10,731 24,989
553.40 10,922 26,072
553.50 11,114 27,173
553.60 11,305 28,294
553.70 11,496 29,434
553.80 11,687 30,593
553.90 11,878 31,772
554.00 12,069 32,969
554.10 12,248 34,185
554.20 12,427 35,419
554.30 12,606 36,670
554.40 12,785 37,940
554.50 12,964 39,227
554.60 13,142 40,532
554.70 13,321 41,856
554.80 13,500 43,197
554.90 13,679 44,556
555.00 13,858 45,933
555.10 14,043 47,328

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 148
Summary for Pond BMP-1: BMP #1
Inflow Area = 28.009 ac, 50.36% Impervious, Inflow Depth = 3.76" for 50-yr-6hr event
Inflow = 175.14 cfs @ 3.15 hrs, Volume= 8.782 of
Outflow = 102.01 cfs @ 3.30 hrs, Volume= 8.781 af, Atten= 42%, Lag= 9.3 min
Primary = 94.82 cfs @ 3.30 hrs, Volume= 8.708 af
Routed to nonexistent node POST-POI#1
Secondary = 7.19 cfs @ 3.30 hrs, Volume= 0.073 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 559.26' @ 3.30 hrs Surf.Area= 49,448 sf Storage= 159,857 cf
Plug-Flow detention time= 291.9 min calculated for 8.774 af(100% of inflow)
Center-of-Mass det. time= 296.0 min ( 501.3 - 205.3 )
Volume Invert Avail.Storage Storage Description
#1 555.50' 223,972 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
555.50 34,578 0 0
556.00 37,559 18,034 18,034
557.00 41,209 39,384 57,418
558.00 44,809 43,009 100,427
559.00 48,473 46,641 147,068
560.00 52,204 50,339 197,407
560.50 54,057 26,565 223,972
Device Routing Invert Outlet Devices
#1 Primary 550.00' 36.0" Round RCP_Round 36"
L= 115.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 550.00' / 548.00' S= 0.0174 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 7.07 sf
#2 Device 1 555.50' 4.0" Horiz. WQ/CP Orifice C= 0.600
Limited to weir flow at low heads
#3 Device 1 557.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 2.00 2.00
#4 Device 1 557.50' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 559.00' 20.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 149
Primary OutFlow Max=94.80 cfs © 3.30 hrs HW=559.26' (Free Discharge)
L1=RCP_Round 36" (Inlet Controls 94.80 cfs @ 13.41 fps)
2=WQ/CP Orifice (Passes < 0.81 cfs potential flow)
3=Custom Weir/Orifice (Passes < 6.96 cfs potential flow)
4=Riser (Passes < 102.16 cfs potential flow)
Secondary OutFlow Max=7.10 cfs @ 3.30 hrs HW=559.26' (Free Discharge)
LS=Broad-Crested Rectangular Weir(Weir Controls 7.10 cfs @ 1.37 fps)
Pond BMP-1: BMP #1
Hydrograph
/- — H 1— 1 4 H I + I 1 1 ■Inflow
175.14 cfs + ❑outflow
i H t 1 -t h 1 1H #I iie .00 p Seondary190
180 I _ —I 1 1 1 1 1 Yea E[elV559.Z160 / 1 -k —I1- 1 —k1-1 -k1-1d- 1 ° 9e_7•11p, 7
150
130fOo1cfS ]± —1 d- 1 - ±I ± I- — 1 - I—I ± 11 1 1
w 11 94.82 cfs 1 1 1 1 1 1 1 1 1 1 1 1 1 1
100 t®
80
70 60 —
% 1 - 1HHI + IH -H1H1 + 1H -H1 �
50 1 1 I-1 1 1 1 1 1 1 1
40 / /////
30 �,
7.19 cfsiu
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 150
Pond BMP-1: BMP #1
Stage-Discharge
0 Total
0 Primary
❑Secondary
560
/�//
Broad-Crested Rectan.ular Weir �`
559 /
0 558 �
•; % j Riser
w / Custom Weir/Orifice
557
556 % WQ/CP Orifice
0 20 40 60 80 100 120 140 160 180
Discharge (cfs)
Pond BMP-1: BMP #1
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 0 Surfacel
❑Storage
560
///
///
559 z
///
0558 II
m
W II
557
- I I I
556-'
Custom Stage Data
0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 220,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 151
Hydrograph for Pond BMP-1: BMP #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 555.50 0.00 0.00 0.00
5.00 7.52 87,766 557.71 9.13 9.13 0.00
10.00 0.00 60,688 557.08 0.68 0.68 0.00
15.00 0.00 51,210 556.85 0.49 0.49 0.00
20.00 0.00 42,782 556.64 0.45 0.45 0.00
25.00 0.00 35,071 556.44 0.41 0.41 0.00
30.00 0.00 28,090 556.26 0.37 0.37 0.00
35.00 0.00 21,852 556.10 0.33 0.33 0.00
40.00 0.00 16,368 555.96 0.28 0.28 0.00
45.00 0.00 11,651 555.83 0.24 0.24 0.00
50.00 0.00 7,718 555.72 0.20 0.20 0.00
55.00 0.00 4,603 555.63 0.14 0.14 0.00
60.00 0.00 2,665 555.58 0.08 0.08 0.00
65.00 0.00 1,697 555.55 0.04 0.04 0.00
70.00 0.00 1,141 555.53 0.03 0.03 0.00
75.00 0.00 767 555.52 0.02 0.02 0.00
80.00 0.00 516 555.51 0.01 0.01 0.00
85.00 0.00 347 555.51 0.01 0.01 0.00
90.00 0.00 233 555.51 0.01 0.01 0.00
95.00 0.00 157 555.50 0.00 0.00 0.00
100.00 0.00 105 555.50 0.00 0.00 0.00
105.00 0.00 71 555.50 0.00 0.00 0.00
110.00 0.00 48 555.50 0.00 0.00 0.00
115.00 0.00 32 555.50 0.00 0.00 0.00
120.00 0.00 22 555.50 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 152
Stage-Discharge for Pond BMP-1: BMP #1
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
555.50 0.00 0.00 0.00 558.10 29.51 29.51 0.00
555.55 0.04 0.04 0.00 558.15 32.75 32.75 0.00
555.60 0.11 0.11 0.00 558.20 36.11 36.11 0.00
555.65 0.16 0.16 0.00 558.25 39.58 39.58 0.00
555.70 0.19 0.19 0.00 558.30 43.16 43.16 0.00
555.75 0.21 0.21 0.00 558.35 46.85 46.85 0.00
555.80 0.23 0.23 0.00 558.40 50.64 50.64 0.00
555.85 0.25 0.25 0.00 558.45 54.54 54.54 0.00
555.90 0.27 0.27 0.00 558.50 58.53 58.53 0.00
555.95 0.28 0.28 0.00 558.55 62.62 62.62 0.00
556.00 0.30 0.30 0.00 558.60 66.80 66.80 0.00
556.05 0.31 0.31 0.00 558.65 71.07 71.07 0.00
556.10 0.33 0.33 0.00 558.70 75.44 75.44 0.00
556.15 0.34 0.34 0.00 558.75 79.89 79.89 0.00
556.20 0.35 0.35 0.00 558.80 84.42 84.42 0.00
556.25 0.36 0.36 0.00 558.85 89.04 89.04 0.00
556.30 0.38 0.38 0.00 558.90 92.59 92.59 0.00
556.35 0.39 0.39 0.00 558.95 92.90 92.90 0.00
556.40 0.40 0.40 0.00 559.00 93.21 93.21 0.00
556.45 0.41 0.41 0.00 559.05 94.12 93.52 0.60
556.50 0.42 0.42 0.00 559.10 95.52 93.83 1.69
556.55 0.43 0.43 0.00 559.15 97.25 94.14 3.11
556.60 0.44 0.44 0.00 559.20 99.24 94.44 4.79
556.65 0.45 0.45 0.00 559.25 101.46 94.75 6.71
556.70 0.46 0.46 0.00 559.30 103.90 95.05 8.84
556.75 0.47 0.47 0.00 559.35 106.52 95.36 11.16
556.80 0.48 0.48 0.00 559.40 109.32 95.66 13.66
556.85 0.49 0.49 0.00 559.45 112.27 95.96 16.30
556.90 0.50 0.50 0.00 559.50 115.36 96.27 19.09
556.95 0.51 0.51 0.00 559.55 118.59 96.57 22.03
557.00 0.51 0.51 0.00 559.60 121.96 96.87 25.10
557.05 0.60 0.60 0.00 559.65 125.31 97.16 28.14
557.10 0.74 0.74 0.00 559.70 128.74 97.46 31.27
557.15 0.92 0.92 0.00 559.75 132.25 97.76 34.49
557.20 1.13 1.13 0.00 559.80 135.83 98.05 37.78
557.25 1.37 1.37 0.00 559.85 139.69 98.35 41.34
557.30 1.64 1.64 0.00 559.90 143.64 98.64 45.00
557.35 1.93 1.93 0.00 559.95 147.69 98.94 48.75
557.40 2.24 2.24 0.00 560.00 151.83 99.23 52.60
557.45 2.56 2.56 0.00 560.05 156.17 99.52 56.65
557.50 2.91 2.91 0.00 560.10 160.61 99.81 60.80
557.55 3.79 3.79 0.00 560.15 165.15 100.10 65.05
557.60 5.10 5.10 0.00 560.20 169.80 100.39 69.41
557.65 6.71 6.71 0.00 560.25 174.47 100.68 73.79
557.70 8.55 8.55 0.00 560.30 179.23 100.96 78.26
557.75 10.61 10.61 0.00 560.35 184.07 101.25 82.82
557.80 12.84 12.84 0.00 560.40 189.00 101.54 87.46
557.85 15.25 15.25 0.00 560.45 193.92 101.82 92.10
557.90 17.82 17.82 0.00 560.50 198.92 102.11 96.82
557.95 20.54 20.54 0.00
558.00 23.40 23.40 0.00
558.05 26.39 26.39 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 153
Stage-Area-Storage for Pond BMP-1: BMP #1
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
555.50 34,578 0 558.10 45,175 104,926
555.55 34,876 1,736 558.15 45,359 107,190
555.60 35,174 3,488 558.20 45,542 109,462
555.65 35,472 5,254 558.25 45,725 111,744
555.70 35,770 7,035 558.30 45,908 114,035
555.75 36,069 8,831 558.35 46,091 116,335
555.80 36,367 10,642 558.40 46,275 118,644
555.85 36,665 12,467 558.45 46,458 120,962
555.90 36,963 14,308 558.50 46,641 123,290
555.95 37,261 16,164 558.55 46,824 125,626
556.00 37,559 18,034 558.60 47,007 127,972
556.05 37,741 19,917 558.65 47,191 130,327
556.10 37,924 21,808 558.70 47,374 132,691
556.15 38,106 23,709 558.75 47,557 135,065
556.20 38,289 25,619 558.80 47,740 137,447
556.25 38,472 27,538 558.85 47,923 139,839
556.30 38,654 29,466 558.90 48,107 142,239
556.35 38,837 31,403 558.95 48,290 144,649
556.40 39,019 33,350 559.00 48,473 147,068
556.45 39,202 35,305 559.05 48,660 149,497
556.50 39,384 37,270 559.10 48,846 151,934
556.55 39,566 39,244 559.15 49,033 154,381
556.60 39,749 41,227 559.20 49,219 156,837
556.65 39,931 43,219 559.25 49,406 159,303
556.70 40,114 45,220 559.30 49,592 161,778
556.75 40,297 47,230 559.35 49,779 164,262
556.80 40,479 49,249 559.40 49,965 166,756
556.85 40,662 51,278 559.45 50,152 169,259
556.90 40,844 53,316 559.50 50,339 171,771
556.95 41,027 55,362 559.55 50,525 174,293
557.00 41,209 57,418 559.60 50,712 176,824
557.05 41,389 59,483 559.65 50,898 179,364
557.10 41,569 61,557 559.70 51,085 181,913
557.15 41,749 63,640 559.75 51,271 184,472
557.20 41,929 65,732 559.80 51,458 187,041
557.25 42,109 67,833 559.85 51,644 189,618
557.30 42,289 69,943 559.90 51,831 192,205
557.35 42,469 72,062 559.95 52,017 194,801
557.40 42,649 74,190 560.00 52,204 197,407
557.45 42,829 76,327 560.05 52,389 200,022
557.50 43,009 78,473 560.10 52,575 202,646
557.55 43,189 80,628 560.15 52,760 205,279
557.60 43,369 82,792 560.20 52,945 207,922
557.65 43,549 84,965 560.25 53,131 210,574
557.70 43,729 87,147 560.30 53,316 213,235
557.75 43,909 89,338 560.35 53,501 215,905
557.80 44,089 91,537 560.40 53,686 218,585
557.85 44,269 93,746 560.45 53,872 221,274
557.90 44,449 95,964 560.50 54,057 223,972
557.95 44,629 98,191
558.00 44,809 100,427
558.05 44,992 102,672

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 154
Summary for Pond BMP-2: BMP #2
Inflow Area = 6.846 ac, 45.49% Impervious, Inflow Depth = 3.66" for 50-yr-6hr event
Inflow = 41.87 cfs @ 3.15 hrs, Volume= 2.088 of
Outflow = 25.89 cfs @ 3.28 hrs, Volume= 2.088 af, Atten= 38%, Lag= 8.0 min
Primary = 25.89 cfs @ 3.28 hrs, Volume= 2.088 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 578.73' @ 3.29 hrs Surf.Area= 13,469 sf Storage= 39,289 cf
Plug-Flow detention time= 746.1 min calculated for 2.086 af(100% of inflow)
Center-of-Mass det. time= 749.7 min ( 955.8 - 206.2 )
Volume Invert Avail.Storage Storage Description
#1 575.00' 57,570 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
575.00 7,651 0 0
576.00 9,115 8,383 8,383
577.00 10,693 9,904 18,287
577.50 11,523 5,554 23,841
578.00 12,385 5,977 29,818
579.00 13,864 13,125 42,943
580.00 15,391 14,628 57,570
Device Routing Invert Outlet Devices
#1 Primary 574.40' 24.0" Round RCP Round 24"
L= 88.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 574.40' / 574.00' S= 0.0045 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 575.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 577.50' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 3.00 3.00
#4 Device 1 578.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 579.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 155
Primary OutFlow Max=25.73 cfs © 3.28 hrs HW=578.71' (Free Discharge)
L1=RCP_Round 24" (Barrel Controls 25.73 cfs @ 8.19 fps)
2=Sand Filter (Passes < 0.08 cfs potential flow)
3=Custom Weir/Orifice (Passes < 7.18 cfs potential flow)
4=Riser (Passes < 31.01 cfs potential flow)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=575.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP-2: BMP #2
/� Hydrograph
/III 1 1 1 1 ■Inflow
41.87 cfs F 1 1 +— 1b f` i. 64 0 Prima r 1a - ou y
46= 0 Secondary
441 42 1 I 1 ]— 4 Peals E-1-6 57-18.f3y —_
404" /
36= / I to a =n1 9I
3 34;25.89 RQr4 t 1 t 1 —h 1— - 1 t - 1- 1 I—I —h
cfs
w 26i 2 I 1 -H1 -P ]- 4 + H -HI -E I-14 1 _
V _
24
20✓ 7/ 1 1 1 1 1 1 -
16= / 1 1 1 1 1 1
14= /
12 /
=
10=
6_/
0.00 cfs ,
0 ..,��/ /
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 156
Pond BMP-2: BMP #2
Stage-Discharge
❑Total
❑Primary
581
�'' ❑Secondary
580
Broad-Crested Rectangular Weir
579
Riser
0 578 Custom Weir/Orifice
w 577
576
Sand Filter /
0 10 20 30 40 50 60 70 80 90 100
Discharge (cfs)
Pond BMP-2: BMP #2
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 Surface
` . ( ❑Storage
581
580:-/
i
579:-/
I I
w 577� i ////���� II
576-
_ J J
Custom Stage Data
575 , , , , , , , ,
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000
Storage(cubic-feet)

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 157
Hydrograph for Pond BMP-2: BMP #2
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 575.00 0.00 0.00 0.00
5.00 1.82 28,227 577.87 2.30 2.30 0.00
10.00 0.00 23,458 577.47 0.08 0.08 0.00
15.00 0.00 22,000 577.34 0.08 0.08 0.00
20.00 0.00 20,542 577.21 0.08 0.08 0.00
25.00 0.00 19,084 577.07 0.08 0.08 0.00
30.00 0.00 17,626 576.94 0.08 0.08 0.00
35.00 0.00 16,168 576.80 0.08 0.08 0.00
40.00 0.00 14,710 576.66 0.08 0.08 0.00
45.00 0.00 13,252 576.51 0.08 0.08 0.00
50.00 0.00 11,794 576.36 0.08 0.08 0.00
55.00 0.00 10,336 576.21 0.08 0.08 0.00
60.00 0.00 8,878 576.05 0.08 0.08 0.00
65.00 0.00 7,420 575.89 0.08 0.08 0.00
70.00 0.00 5,962 575.73 0.08 0.08 0.00
75.00 0.00 4,504 575.56 0.08 0.08 0.00
80.00 0.00 3,046 575.38 0.08 0.08 0.00
85.00 0.00 1,588 575.20 0.08 0.08 0.00
90.00 0.00 130 575.02 0.08 0.08 0.00
95.00 0.00 0 575.00 0.00 0.00 0.00
100.00 0.00 0 575.00 0.00 0.00 0.00
105.00 0.00 0 575.00 0.00 0.00 0.00
110.00 0.00 0 575.00 0.00 0.00 0.00
115.00 0.00 0 575.00 0.00 0.00 0.00
120.00 0.00 0 575.00 0.00 0.00 0.00

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 158
Stage-Discharge for Pond BMP-2: BMP #2
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
575.00 0.00 0.00 0.00 580.20 66.77 32.06 34.70
575.10 0.08 0.08 0.00 580.30 71.57 32.44 39.13
575.20 0.08 0.08 0.00 580.40 76.55 32.82 43.73
575.30 0.08 0.08 0.00 580.50 81.60 33.19 48.41
575.40 0.08 0.08 0.00 580.60 86.78 33.55 53.23
575.50 0.08 0.08 0.00 580.70 92.21 33.92 58.29
575.60 0.08 0.08 0.00 580.80 97.79 34.28 63.51
575.70 0.08 0.08 0.00 580.90 103.51 34.63 68.88
575.80 0.08 0.08 0.00 581.00 109.37 34.98 74.39
575.90 0.08 0.08 0.00
576.00 0.08 0.08 0.00
576.10 0.08 0.08 0.00
576.20 0.08 0.08 0.00
576.30 0.08 0.08 0.00
576.40 0.08 0.08 0.00
576.50 0.08 0.08 0.00
576.60 0.08 0.08 0.00
576.70 0.08 0.08 0.00
576.80 0.08 0.08 0.00
576.90 0.08 0.08 0.00
577.00 0.08 0.08 0.00
577.10 0.08 0.08 0.00
577.20 0.08 0.08 0.00
577.30 0.08 0.08 0.00
577.40 0.08 0.08 0.00
577.50 0.08 0.08 0.00
577.60 0.39 0.39 0.00
577.70 0.96 0.96 0.00
577.80 1.70 1.70 0.00
577.90 2.57 2.57 0.00
578.00 3.55 3.55 0.00
578.10 5.99 5.99 0.00
578.20 9.64 9.64 0.00
578.30 14.09 14.09 0.00
578.40 19.22 19.22 0.00
578.50 24.74 24.74 0.00
578.60 25.23 25.23 0.00
578.70 25.71 25.71 0.00
578.80 26.18 26.18 0.00
578.90 26.64 26.64 0.00
579.00 27.10 27.10 0.00
579.10 28.39 27.55 0.85
579.20 30.38 27.99 2.40
579.30 32.84 28.42 4.42
579.40 35.68 28.85 6.83
579.50 38.82 29.27 9.55
579.60 42.23 29.68 12.55
579.70 45.73 30.09 15.64
579.80 49.39 30.50 18.89
579.90 53.39 30.90 22.50
580.00 57.59 31.29 26.30
580.10 62.08 31.68 30.40

Detention
Davis Village Charlotte 6-hr 50-yr 50-yr-6hr Rainfall=4.99"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 159
Stage-Area-Storage for Pond BMP-2: BMP #2
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
575.00 7,651 0 580.20 15,391 57,570
575.10 7,797 772 580.30 15,391 57,570
575.20 7,944 1,559 580.40 15,391 57,570
575.30 8,090 2,361 580.50 15,391 57,570
575.40 8,237 3,178 580.60 15,391 57,570
575.50 8,383 4,009 580.70 15,391 57,570
575.60 8,529 4,854 580.80 15,391 57,570
575.70 8,676 5,714 580.90 15,391 57,570
575.80 8,822 6,589 581.00 15,391 57,570
575.90 8,969 7,479
576.00 9,115 8,383
576.10 9,273 9,302
576.20 9,431 10,238
576.30 9,588 11,189
576.40 9,746 12,155
576.50 9,904 13,138
576.60 10,062 14,136
576.70 10,220 15,150
576.80 10,377 16,180
576.90 10,535 17,226
577.00 10,693 18,287
577.10 10,859 19,365
577.20 11,025 20,459
577.30 11,191 21,570
577.40 11,357 22,697
577.50 11,523 23,841
577.60 11,695 25,002
577.70 11,868 26,180
577.80 12,040 27,375
577.90 12,213 28,588
578.00 12,385 29,818
578.10 12,533 31,064
578.20 12,681 32,325
578.30 12,829 33,600
578.40 12,977 34,890
578.50 13,125 36,195
578.60 13,272 37,515
578.70 13,420 38,850
578.80 13,568 40,199
578.90 13,716 41,563
579.00 13,864 42,943
579.10 14,017 44,337
579.20 14,169 45,746
579.30 14,322 47,170
579.40 14,475 48,610
579.50 14,628 50,065
579.60 14,780 51,536
579.70 14,933 53,021
579.80 15,086 54,522
579.90 15,238 56,039
580.00 15,391 57,570
580.10 15,391 57,570

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 160
Time span=0.00-120.00 hrs, dt=0.10 hrs, 1201 points
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA#1: Post-Development Runoff Area=28.009 ac 50.36% Impervious Runoff Depth=4.30"
Tc=5.0 min CN=89 Runoff=254.17 cfs 10.038 af
Subcatchment DA#2: Post-Development Runoff Area=6.846 ac 45.49% Impervious Runoff Depth=4.19"
Tc=5.0 min CN=88 Runoff=61.09 cfs 2.392 af
Subcatchment DA#3: Post-Development Runoff Area=4.651 ac 56.27% Impervious Runoff Depth=4.41"
Tc=5.0 min CN=90 Runoff=42.88 cfs 1.709 af
Subcatchment PRE#1: Predevelopment#1 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=3.78"
Tc=29.5 min CN=84 Runoff=126.81 cfs 8.817 af
Subcatchment PRE#2: Predevelopment#2 Runoff Area=6.846 ac 0.00% Impervious Runoff Depth=3.78"
Tc=31.9 min CN=84 Runoff=29.31 cfs 2.155 af
SubcatchmentPRE#3: Predevelopment#3 Runoff Area=28.010 ac 0.00% Impervious Runoff Depth=3.78"
Tc=31.9 min CN=84 Runoff=119.91 cfs 8.817 af
Pond BMP#3: BMP#3 Peak Elev=554.43' Storage=38,372 cf Inflow=42.88 cfs 1.709 af
Primary=24.37 cfs 1.709 af Secondary=0.00 cfs 0.000 af Outflow=24.37 cfs 1.709 af
Pond BMP-1: BMP#1 Peak Elev=559.84' Storage=189,051 cf Inflow=254.17 cfs 10.038 af
Primary=98.29 cfs 9.385 af Secondary=40.12 cfs 0.653 af Outflow=138.41 cfs 10.037 af
Pond BMP-2: BMP#2 Peak Elev=579.33' Storage=47,605 cf Inflow=61.09 cfs 2.392 af
Primary=28.56 cfs 2.337 af Secondary=4.71 cfs 0.056 af Outflow=33.25 cfs 2.392 af
Total Runoff Area = 102.372 ac Runoff Volume = 33.927 af Average Runoff Depth = 3.98"
80.62% Pervious = 82.537 ac 19.38% Impervious = 19.835 ac

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 161
Summary for Subcatchment DA#1: Post-Development Pond #1
Runoff = 254.17 cfs @ 2.95 hrs, Volume= 10.038 af, Depth= 4.30"
Routed to Pond BMP-1 : BMP #1
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 6-hr 100yr 6hr Rainfall=5.55"
Area (ac) CN Description
• 3.238 98 Roadway
• 1.043 98 Sidewalk
• 9.823 98 Buildings/Driveways
13.905 80 >75% Grass cover, Good, HSG D
28.009 89 Weighted Average
13.905 49.64% Pervious Area
14.104 50.36% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#1: Post-Development Pond #1
Hydrograph
2Rn 0 Runoff
254.17 cfs
240 /
220- I I I I I I P -6-fir
200=' I 1p0yr 16hr F�ainfaII 5.155,"
1807 _ — + 4 4 rtt.1 niff rleA1=2_p' 0�
• 160-' _Ru noff_ olu me= O.038 af
• 140 l Runffi Bp h413(r
• 120 _ I — — 4 1- I —I 4 4 Ic5�0 �rnh
100
80
60
40 /
20 0
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 162
Hydrograph for Subcatchment DA#1: Post-Development Pond #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 5.55 4.30 0.00
2.00 0.69 0.12 6.58 106.00 5.55 4.30 0.00
4.00 4.91 3.69 13.78 108.00 5.55 4.30 0.00
6.00 5.55 4.30 6.36 110.00 5.55 4.30 0.00
8.00 5.55 4.30 0.00 112.00 5.55 4.30 0.00
10.00 5.55 4.30 0.00 114.00 5.55 4.30 0.00
12.00 5.55 4.30 0.00 116.00 5.55 4.30 0.00
14.00 5.55 4.30 0.00 118.00 5.55 4.30 0.00
16.00 5.55 4.30 0.00 120.00 5.55 4.30 0.00
18.00 5.55 4.30 0.00
20.00 5.55 4.30 0.00
22.00 5.55 4.30 0.00
24.00 5.55 4.30 0.00
26.00 5.55 4.30 0.00
28.00 5.55 4.30 0.00
30.00 5.55 4.30 0.00
32.00 5.55 4.30 0.00
34.00 5.55 4.30 0.00
36.00 5.55 4.30 0.00
38.00 5.55 4.30 0.00
40.00 5.55 4.30 0.00
42.00 5.55 4.30 0.00
44.00 5.55 4.30 0.00
46.00 5.55 4.30 0.00
48.00 5.55 4.30 0.00
50.00 5.55 4.30 0.00
52.00 5.55 4.30 0.00
54.00 5.55 4.30 0.00
56.00 5.55 4.30 0.00
58.00 5.55 4.30 0.00
60.00 5.55 4.30 0.00
62.00 5.55 4.30 0.00
64.00 5.55 4.30 0.00
66.00 5.55 4.30 0.00
68.00 5.55 4.30 0.00
70.00 5.55 4.30 0.00
72.00 5.55 4.30 0.00
74.00 5.55 4.30 0.00
76.00 5.55 4.30 0.00
78.00 5.55 4.30 0.00
80.00 5.55 4.30 0.00
82.00 5.55 4.30 0.00
84.00 5.55 4.30 0.00
86.00 5.55 4.30 0.00
88.00 5.55 4.30 0.00
90.00 5.55 4.30 0.00
92.00 5.55 4.30 0.00
94.00 5.55 4.30 0.00
96.00 5.55 4.30 0.00
98.00 5.55 4.30 0.00
100.00 5.55 4.30 0.00
102.00 5.55 4.30 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 163
Summary for Subcatchment DA#2: Post-Development Pond #2
Runoff = 61.09 cfs @ 2.95 hrs, Volume= 2.392 af, Depth= 4.19"
Routed to Pond BMP-2 : BMP #2
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 6-hr 100yr 6hr Rainfall=5.55"
Area (ac) CN Description
• 1.262 98 Roadway
• 0.445 98 Sidewalk
• 0.964 98 Buildings/Driveways
3.732 80 >75% Grass cover, Good, HSG D
• 0.443 98 Amenity Impervious
6.846 88 Weighted Average
3.732 54.51% Pervious Area
3.114 45.49% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#2: Post-Development Pond #2
Hydrograph
_ ■Runoff
61.09 cfs
60_ j I i i l
557 I Eit
50 101-Oyrr-6h RainfaII#5.551" —
45=
7 7 —I - - 1 7 -- 1Rinpf1-Area=6.846 ac
w• 35_- L —Rrnff Vple=2. 9f
307 Runoff Depth=4.19"
25= fi �c5.0
15_
10-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 164
Hydrograph for Subcatchment DA#2: Post-Development Pond #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 5.55 4.19 0.00
2.00 0.69 0.10 1.44 106.00 5.55 4.19 0.00
4.00 4.91 3.58 3.34 108.00 5.55 4.19 0.00
6.00 5.55 4.19 1.54 110.00 5.55 4.19 0.00
8.00 5.55 4.19 0.00 112.00 5.55 4.19 0.00
10.00 5.55 4.19 0.00 114.00 5.55 4.19 0.00
12.00 5.55 4.19 0.00 116.00 5.55 4.19 0.00
14.00 5.55 4.19 0.00 118.00 5.55 4.19 0.00
16.00 5.55 4.19 0.00 120.00 5.55 4.19 0.00
18.00 5.55 4.19 0.00
20.00 5.55 4.19 0.00
22.00 5.55 4.19 0.00
24.00 5.55 4.19 0.00
26.00 5.55 4.19 0.00
28.00 5.55 4.19 0.00
30.00 5.55 4.19 0.00
32.00 5.55 4.19 0.00
34.00 5.55 4.19 0.00
36.00 5.55 4.19 0.00
38.00 5.55 4.19 0.00
40.00 5.55 4.19 0.00
42.00 5.55 4.19 0.00
44.00 5.55 4.19 0.00
46.00 5.55 4.19 0.00
48.00 5.55 4.19 0.00
50.00 5.55 4.19 0.00
52.00 5.55 4.19 0.00
54.00 5.55 4.19 0.00
56.00 5.55 4.19 0.00
58.00 5.55 4.19 0.00
60.00 5.55 4.19 0.00
62.00 5.55 4.19 0.00
64.00 5.55 4.19 0.00
66.00 5.55 4.19 0.00
68.00 5.55 4.19 0.00
70.00 5.55 4.19 0.00
72.00 5.55 4.19 0.00
74.00 5.55 4.19 0.00
76.00 5.55 4.19 0.00
78.00 5.55 4.19 0.00
80.00 5.55 4.19 0.00
82.00 5.55 4.19 0.00
84.00 5.55 4.19 0.00
86.00 5.55 4.19 0.00
88.00 5.55 4.19 0.00
90.00 5.55 4.19 0.00
92.00 5.55 4.19 0.00
94.00 5.55 4.19 0.00
96.00 5.55 4.19 0.00
98.00 5.55 4.19 0.00
100.00 5.55 4.19 0.00
102.00 5.55 4.19 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 165
Summary for Subcatchment DA#3: Post-Development Pond #3
Runoff = 42.88 cfs @ 2.95 hrs, Volume= 1.709 af, Depth= 4.41"
Routed to Pond BMP#3 : BMP #3
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 6-hr 100yr 6hr Rainfall=5.55"
Area (ac) CN Description
• 0.677 98 Roadway
• 0.221 98 Sidewalk
• 1.481 98 Buildings/Driveways
2.034 80 >75% Grass cover, Good, HSG D
• 0.203 98 Parking
• 0.035 98 Ex. Impervious
4.651 90 Weighted Average
2.034 43.73% Pervious Area
2.617 56.27% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DA#3: Post-Development Pond #3
Hydrograph
48 I — ■Runoff
42.88 cfs
42 � I
40_ / - � r
38_/
36
34/ — 4 10-010-6h Rlaihf 11 -5.55"
28 � �� 11
26_ ff Volume=1.7rlf
LL 22. Runoff De =4.4 " -
20
18
161
141 H— 1 Cti469j0
12,
10
6
4
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 166
Hydrograph for Subcatchment DA#3: Post-Development Pond #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 5.55 4.41 0.00
2.00 0.69 0.14 1.21 106.00 5.55 4.41 0.00
4.00 4.91 3.79 2.31 108.00 5.55 4.41 0.00
6.00 5.55 4.41 1.06 110.00 5.55 4.41 0.00
8.00 5.55 4.41 0.00 112.00 5.55 4.41 0.00
10.00 5.55 4.41 0.00 114.00 5.55 4.41 0.00
12.00 5.55 4.41 0.00 116.00 5.55 4.41 0.00
14.00 5.55 4.41 0.00 118.00 5.55 4.41 0.00
16.00 5.55 4.41 0.00 120.00 5.55 4.41 0.00
18.00 5.55 4.41 0.00
20.00 5.55 4.41 0.00
22.00 5.55 4.41 0.00
24.00 5.55 4.41 0.00
26.00 5.55 4.41 0.00
28.00 5.55 4.41 0.00
30.00 5.55 4.41 0.00
32.00 5.55 4.41 0.00
34.00 5.55 4.41 0.00
36.00 5.55 4.41 0.00
38.00 5.55 4.41 0.00
40.00 5.55 4.41 0.00
42.00 5.55 4.41 0.00
44.00 5.55 4.41 0.00
46.00 5.55 4.41 0.00
48.00 5.55 4.41 0.00
50.00 5.55 4.41 0.00
52.00 5.55 4.41 0.00
54.00 5.55 4.41 0.00
56.00 5.55 4.41 0.00
58.00 5.55 4.41 0.00
60.00 5.55 4.41 0.00
62.00 5.55 4.41 0.00
64.00 5.55 4.41 0.00
66.00 5.55 4.41 0.00
68.00 5.55 4.41 0.00
70.00 5.55 4.41 0.00
72.00 5.55 4.41 0.00
74.00 5.55 4.41 0.00
76.00 5.55 4.41 0.00
78.00 5.55 4.41 0.00
80.00 5.55 4.41 0.00
82.00 5.55 4.41 0.00
84.00 5.55 4.41 0.00
86.00 5.55 4.41 0.00
88.00 5.55 4.41 0.00
90.00 5.55 4.41 0.00
92.00 5.55 4.41 0.00
94.00 5.55 4.41 0.00
96.00 5.55 4.41 0.00
98.00 5.55 4.41 0.00
100.00 5.55 4.41 0.00
102.00 5.55 4.41 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 167
Summary for Subcatchment PRE#1: Predevelopment #1
Runoff = 126.81 cfs @ 3.24 hrs, Volume= 8.817 af, Depth= 3.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 6-hr 100yr 6hr Rainfall=5.55"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
29.5 Direct Entry,
Subcatchment PRE#1: Predevelopment #1
Hydrograph
140 9 I ❑Runoff
126.81 cfs
120: T T T� I T 4 t—
110-
100_' 1010yWr 6htt Rlaillfall#5.55"
90 I- 1 I T H T T 1 -1 T o Area 2 W aP
ffTV?1 LI 17=8 n!r1—;
Runoff De th=
LL 60 T T 1-r = 9.l5-ilni-
50
40_ 717 T T IT 717 T 171T TIT 7(:N661
30-/ T 1 1
20=
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 168
Hydrograph for Subcatchment PRE#1: Predevelopment #1
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 5.55 3.78 0.00
2.00 0.69 0.04 1.24 106.00 5.55 3.78 0.00
4.00 4.91 3.19 22.30 108.00 5.55 3.78 0.00
6.00 5.55 3.78 6.82 110.00 5.55 3.78 0.00
8.00 5.55 3.78 0.00 112.00 5.55 3.78 0.00
10.00 5.55 3.78 0.00 114.00 5.55 3.78 0.00
12.00 5.55 3.78 0.00 116.00 5.55 3.78 0.00
14.00 5.55 3.78 0.00 118.00 5.55 3.78 0.00
16.00 5.55 3.78 0.00 120.00 5.55 3.78 0.00
18.00 5.55 3.78 0.00
20.00 5.55 3.78 0.00
22.00 5.55 3.78 0.00
24.00 5.55 3.78 0.00
26.00 5.55 3.78 0.00
28.00 5.55 3.78 0.00
30.00 5.55 3.78 0.00
32.00 5.55 3.78 0.00
34.00 5.55 3.78 0.00
36.00 5.55 3.78 0.00
38.00 5.55 3.78 0.00
40.00 5.55 3.78 0.00
42.00 5.55 3.78 0.00
44.00 5.55 3.78 0.00
46.00 5.55 3.78 0.00
48.00 5.55 3.78 0.00
50.00 5.55 3.78 0.00
52.00 5.55 3.78 0.00
54.00 5.55 3.78 0.00
56.00 5.55 3.78 0.00
58.00 5.55 3.78 0.00
60.00 5.55 3.78 0.00
62.00 5.55 3.78 0.00
64.00 5.55 3.78 0.00
66.00 5.55 3.78 0.00
68.00 5.55 3.78 0.00
70.00 5.55 3.78 0.00
72.00 5.55 3.78 0.00
74.00 5.55 3.78 0.00
76.00 5.55 3.78 0.00
78.00 5.55 3.78 0.00
80.00 5.55 3.78 0.00
82.00 5.55 3.78 0.00
84.00 5.55 3.78 0.00
86.00 5.55 3.78 0.00
88.00 5.55 3.78 0.00
90.00 5.55 3.78 0.00
92.00 5.55 3.78 0.00
94.00 5.55 3.78 0.00
96.00 5.55 3.78 0.00
98.00 5.55 3.78 0.00
100.00 5.55 3.78 0.00
102.00 5.55 3.78 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 169
Summary for Subcatchment PRE#2: Predevelopment #2
Runoff = 29.31 cfs @ 3.27 hrs, Volume= 2.155 af, Depth= 3.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 6-hr 100yr 6hr Rainfall=5.55"
Area (ac) CN Description
6.846 84 Pasture/grassland/range, Fair, HSG D
6.846 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#2: Predevelopment #2
Hydrograph
■Runoff
29.31 cfs _ T
28
1yi eil
267 T 71 T T 1 T T 1717 ir -
22T 1 OlOyrr�h -RlarhffII*-5.1551" -
20V I/ T T _L i 4nloffTAre41 j•q4§Ap -
U18 I � T I
LL 12 / T S I T T 11 41 1.4
10� / TIC 14 I- I I I 46 -
8- / - - —
zt
= ,
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 170
Hydrograph for Subcatchment PRE#2: Predevelopment #2
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 5.55 3.78 0.00
2.00 0.69 0.04 0.27 106.00 5.55 3.78 0.00
4.00 4.91 3.19 5.98 108.00 5.55 3.78 0.00
6.00 5.55 3.78 1.68 110.00 5.55 3.78 0.00
8.00 5.55 3.78 0.00 112.00 5.55 3.78 0.00
10.00 5.55 3.78 0.00 114.00 5.55 3.78 0.00
12.00 5.55 3.78 0.00 116.00 5.55 3.78 0.00
14.00 5.55 3.78 0.00 118.00 5.55 3.78 0.00
16.00 5.55 3.78 0.00 120.00 5.55 3.78 0.00
18.00 5.55 3.78 0.00
20.00 5.55 3.78 0.00
22.00 5.55 3.78 0.00
24.00 5.55 3.78 0.00
26.00 5.55 3.78 0.00
28.00 5.55 3.78 0.00
30.00 5.55 3.78 0.00
32.00 5.55 3.78 0.00
34.00 5.55 3.78 0.00
36.00 5.55 3.78 0.00
38.00 5.55 3.78 0.00
40.00 5.55 3.78 0.00
42.00 5.55 3.78 0.00
44.00 5.55 3.78 0.00
46.00 5.55 3.78 0.00
48.00 5.55 3.78 0.00
50.00 5.55 3.78 0.00
52.00 5.55 3.78 0.00
54.00 5.55 3.78 0.00
56.00 5.55 3.78 0.00
58.00 5.55 3.78 0.00
60.00 5.55 3.78 0.00
62.00 5.55 3.78 0.00
64.00 5.55 3.78 0.00
66.00 5.55 3.78 0.00
68.00 5.55 3.78 0.00
70.00 5.55 3.78 0.00
72.00 5.55 3.78 0.00
74.00 5.55 3.78 0.00
76.00 5.55 3.78 0.00
78.00 5.55 3.78 0.00
80.00 5.55 3.78 0.00
82.00 5.55 3.78 0.00
84.00 5.55 3.78 0.00
86.00 5.55 3.78 0.00
88.00 5.55 3.78 0.00
90.00 5.55 3.78 0.00
92.00 5.55 3.78 0.00
94.00 5.55 3.78 0.00
96.00 5.55 3.78 0.00
98.00 5.55 3.78 0.00
100.00 5.55 3.78 0.00
102.00 5.55 3.78 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 171
Summary for Subcatchment PRE#3: Predevelopment #3
Runoff = 119.91 cfs @ 3.27 hrs, Volume= 8.817 af, Depth= 3.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Type II 6-hr 100yr 6hr Rainfall=5.55"
Area (ac) CN Description
28.010 84 Pasture/grassland/range, Fair, HSG D
28.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
31.9 Direct Entry,
Subcatchment PRE#3: Predevelopment #3
Hydrograph
-- 0 Runoff
119.91 cfs 120 I �yp
= � � �
100
90 - - * - * 1010 1r-6hr Rairhfel 5-55"
80 / F utpo#f Area=2 qt ap
70
° 60 Runoff De th=3 8"
LL 50 / IT�p1.9
40 / I I dN84
30 /
20
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 172
Hydrograph for Subcatchment PRE#3: Predevelopment #3
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 104.00 5.55 3.78 0.00
2.00 0.69 0.04 1.10 106.00 5.55 3.78 0.00
4.00 4.91 3.19 24.46 108.00 5.55 3.78 0.00
6.00 5.55 3.78 6.88 110.00 5.55 3.78 0.00
8.00 5.55 3.78 0.00 112.00 5.55 3.78 0.00
10.00 5.55 3.78 0.00 114.00 5.55 3.78 0.00
12.00 5.55 3.78 0.00 116.00 5.55 3.78 0.00
14.00 5.55 3.78 0.00 118.00 5.55 3.78 0.00
16.00 5.55 3.78 0.00 120.00 5.55 3.78 0.00
18.00 5.55 3.78 0.00
20.00 5.55 3.78 0.00
22.00 5.55 3.78 0.00
24.00 5.55 3.78 0.00
26.00 5.55 3.78 0.00
28.00 5.55 3.78 0.00
30.00 5.55 3.78 0.00
32.00 5.55 3.78 0.00
34.00 5.55 3.78 0.00
36.00 5.55 3.78 0.00
38.00 5.55 3.78 0.00
40.00 5.55 3.78 0.00
42.00 5.55 3.78 0.00
44.00 5.55 3.78 0.00
46.00 5.55 3.78 0.00
48.00 5.55 3.78 0.00
50.00 5.55 3.78 0.00
52.00 5.55 3.78 0.00
54.00 5.55 3.78 0.00
56.00 5.55 3.78 0.00
58.00 5.55 3.78 0.00
60.00 5.55 3.78 0.00
62.00 5.55 3.78 0.00
64.00 5.55 3.78 0.00
66.00 5.55 3.78 0.00
68.00 5.55 3.78 0.00
70.00 5.55 3.78 0.00
72.00 5.55 3.78 0.00
74.00 5.55 3.78 0.00
76.00 5.55 3.78 0.00
78.00 5.55 3.78 0.00
80.00 5.55 3.78 0.00
82.00 5.55 3.78 0.00
84.00 5.55 3.78 0.00
86.00 5.55 3.78 0.00
88.00 5.55 3.78 0.00
90.00 5.55 3.78 0.00
92.00 5.55 3.78 0.00
94.00 5.55 3.78 0.00
96.00 5.55 3.78 0.00
98.00 5.55 3.78 0.00
100.00 5.55 3.78 0.00
102.00 5.55 3.78 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 173
Summary for Pond BMP#3: BMP #3
Inflow Area = 4.651 ac, 56.27% Impervious, Inflow Depth = 4.41" for 100yr 6hr event
Inflow = 42.88 cfs @ 2.95 hrs, Volume= 1.709 af
Outflow = 24.37 cfs @ 3.09 hrs, Volume= 1.709 af, Atten= 43%, Lag= 8.2 min
Primary = 24.37 cfs @ 3.09 hrs, Volume= 1.709 af
Routed to nonexistent node POST-POI#1
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 554.43' @ 3.09 hrs Surf.Area= 12,845 sf Storage= 38,372 cf
Plug-Flow detention time= 789.4 min calculated for 1.707 af(100% of inflow)
Center-of-Mass det. time= 792.6 min ( 986.4 - 193.7 )
Volume Invert Avail.Storage Storage Description
#1 550.00' 95,966 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
550.00 4,583 0 0
551.00 6,298 5,441 5,441
552.00 8,187 7,243 12,683
553.00 10,158 9,173 21,856
554.00 12,069 11,114 32,969
555.00 13,858 12,964 45,933
556.00 15,706 14,782 60,715
557.00 17,611 16,659 77,373
558.00 19,575 18,593 95,966
Device Routing Invert Outlet Devices
#1 Primary 549.50' 24.0" Round RCP Round 24"
L= 85.0' RCP, square edge headwall, Ke= 0.500
Inlet/Outlet Invert= 549.50' / 548.96' S= 0.0064 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 550.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 553.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00
Width (feet) 2.00 2.00
#4 Device 1 554.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 556.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 174
Primary OutFlow Max=23.17 cfs © 3.09 hrs HW=554.41' (Free Discharge)
4-1=RCP_Round 24" (Passes 23.17 cfs of 29.28 cfs potential flow)
2=Sand Filter (Custom Controls 0.08 cfs)
3=Custom Weir/Orifice (Orifice Controls 9.26 cfs @ 4.63 fps)
4=Riser (Weir Controls 13.83 cfs © 2.10 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=550.00' (Free Discharge)
LS=Broad-Crested Rectangular Weir( Controls 0.00 cfs)
Pond BMP#3: BMP #3
Hydrograph
/ 1 1 1 1 1 1 1 1 1 1 1 - ■Inflow
l 42.88 cfs � p��� � ■Outflow
i li t v �iA►� 4.�6 1 I ■Se ondary
/ i
45� 1I Peak E+leV 554..43' —
401/ S o a n3 2-e
7d '17rf
2 24.37 cfs
w i
-(2- 25
U- 20
1 1 1
/
15 / —
10 / I I I
0.00 cfs %/%//////////////%///////////////%///////////////%///����ff������
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 175
Pond BMP#3: BMP #3
Stage-Discharge
❑Total '
558 ❑Primary
❑Secondary
557 /
/,� Broad-Crested Rectan.ular Weir
556
^ 555 ...d/
.2 /a�' Riser
0 554 '
�III Custom Weir/Orifice
553 %
552
551 / Sand Filter
/
0 10 20 30 40 50 60 70 80 90 100 110
Discharge (cfs)
Pond BMP#3: BMP #3
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 Surface
❑Storage
558_ I I 1 ��� �������
557 I ��� �� I I I
5561/
555 -/ ��/�/ —
2 - ' II II I //' — I I
o 554- , //�/ /� I 41 I
> -
w 553LZ I 4 I I 41 1
552: I I -I I -
5511/ 1
Custom Stage Data
550 ( ,
0 10,,000 20,000 30,000 40,000 50,000 60,,000 70,000 80,000 90,000'
Storage(cubic-feet)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 176
Hydrograph for Pond BMP#3: BMP #3
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 550.00 0.00 0.00 0.00
5.00 1.37 26,231 553.41 1.83 1.83 0.00
10.00 0.00 21,568 552.97 0.08 0.08 0.00
15.00 0.00 20,110 552.83 0.08 0.08 0.00
20.00 0.00 18,652 552.67 0.08 0.08 0.00
25.00 0.00 17,194 552.52 0.08 0.08 0.00
30.00 0.00 15,736 552.36 0.08 0.08 0.00
35.00 0.00 14,278 552.19 0.08 0.08 0.00
40.00 0.00 12,820 552.02 0.08 0.08 0.00
45.00 0.00 11,362 551.84 0.08 0.08 0.00
50.00 0.00 9,904 551.65 0.08 0.08 0.00
55.00 0.00 8,446 551.45 0.08 0.08 0.00
60.00 0.00 6,988 551.24 0.08 0.08 0.00
65.00 0.00 5,530 551.01 0.08 0.08 0.00
70.00 0.00 4,072 550.78 0.08 0.08 0.00
75.00 0.00 2,614 550.52 0.08 0.08 0.00
80.00 0.00 1,156 550.24 0.08 0.08 0.00
85.00 0.00 0 550.00 0.00 0.00 0.00
90.00 0.00 0 550.00 0.00 0.00 0.00
95.00 0.00 0 550.00 0.00 0.00 0.00
100.00 0.00 0 550.00 0.00 0.00 0.00
105.00 0.00 0 550.00 0.00 0.00 0.00
110.00 0.00 0 550.00 0.00 0.00 0.00
115.00 0.00 0 550.00 0.00 0.00 0.00
120.00 0.00 0 550.00 0.00 0.00 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 177
Stage-Discharge for Pond BMP#3: BMP #3
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
550.00 0.00 0.00 0.00 555.20 32.45 32.45 0.00
550.10 0.08 0.08 0.00 555.30 32.83 32.83 0.00
550.20 0.08 0.08 0.00 555.40 33.21 33.21 0.00
550.30 0.08 0.08 0.00 555.50 33.58 33.58 0.00
550.40 0.08 0.08 0.00 555.60 33.95 33.95 0.00
550.50 0.08 0.08 0.00 555.70 34.31 34.31 0.00
550.60 0.08 0.08 0.00 555.80 34.67 34.67 0.00
550.70 0.08 0.08 0.00 555.90 35.03 35.03 0.00
550.80 0.08 0.08 0.00 556.00 35.38 35.38 0.00
550.90 0.08 0.08 0.00 556.10 36.58 35.73 0.85
551.00 0.08 0.08 0.00 556.20 38.47 36.07 2.40
551.10 0.08 0.08 0.00 556.30 40.84 36.42 4.42
551.20 0.08 0.08 0.00 556.40 43.57 36.74 6.83
551.30 0.08 0.08 0.00 556.50 46.60 37.05 9.55
551.40 0.08 0.08 0.00 556.60 49.91 37.36 12.55
551.50 0.08 0.08 0.00 556.70 53.30 37.67 15.64
551.60 0.08 0.08 0.00 556.80 56.86 37.97 18.89
551.70 0.08 0.08 0.00 556.90 60.77 38.27 22.50
551.80 0.08 0.08 0.00 557.00 64.87 38.57 26.30
551.90 0.08 0.08 0.00 557.10 69.26 38.86 30.40
552.00 0.08 0.08 0.00 557.20 73.86 39.15 34.70
552.10 0.08 0.08 0.00 557.30 78.58 39.45 39.13
552.20 0.08 0.08 0.00 557.40 83.47 39.73 43.73
552.30 0.08 0.08 0.00 557.50 88.43 40.02 48.41
552.40 0.08 0.08 0.00 557.60 93.53 40.31 53.23
552.50 0.08 0.08 0.00 557.70 98.88 40.59 58.29
552.60 0.08 0.08 0.00 557.80 104.38 40.87 63.51
552.70 0.08 0.08 0.00 557.90 110.03 41.15 68.88
552.80 0.08 0.08 0.00 558.00 115.81 41.43 74.39
552.90 0.08 0.08 0.00
553.00 0.08 0.08 0.00
553.10 0.29 0.29 0.00
553.20 0.67 0.67 0.00
553.30 1.16 1.16 0.00
553.40 1.74 1.74 0.00
553.50 2.40 2.40 0.00
553.60 3.13 3.13 0.00
553.70 3.92 3.92 0.00
553.80 4.77 4.77 0.00
553.90 5.67 5.67 0.00
554.00 6.63 6.63 0.00
554.10 9.09 9.09 0.00
554.20 12.78 12.78 0.00
554.30 17.31 17.31 0.00
554.40 22.51 22.51 0.00
554.50 28.30 28.30 0.00
554.60 30.07 30.07 0.00
554.70 30.48 30.48 0.00
554.80 30.88 30.88 0.00
554.90 31.28 31.28 0.00
555.00 31.68 31.68 0.00
555.10 32.06 32.06 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 178
Stage-Area-Storage for Pond BMP#3: BMP #3
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
550.00 4,583 0 555.20 14,228 48,741
550.10 4,755 467 555.30 14,412 50,173
550.20 4,926 951 555.40 14,597 51,624
550.30 5,097 1,452 555.50 14,782 53,093
550.40 5,269 1,970 555.60 14,967 54,580
550.50 5,441 2,506 555.70 15,152 56,086
550.60 5,612 3,059 555.80 15,336 57,610
550.70 5,784 3,628 555.90 15,521 59,153
550.80 5,955 4,215 556.00 15,706 60,715
550.90 6,126 4,819 556.10 15,897 62,295
551.00 6,298 5,441 556.20 16,087 63,894
551.10 6,487 6,080 556.30 16,277 65,512
551.20 6,676 6,738 556.40 16,468 67,149
551.30 6,865 7,415 556.50 16,659 68,806
551.40 7,054 8,111 556.60 16,849 70,481
551.50 7,243 8,826 556.70 17,040 72,175
551.60 7,431 9,559 556.80 17,230 73,889
551.70 7,620 10,312 556.90 17,420 75,621
551.80 7,809 11,083 557.00 17,611 77,373
551.90 7,998 11,874 557.10 17,807 79,144
552.00 8,187 12,683 557.20 18,004 80,934
552.10 8,384 13,512 557.30 18,200 82,745
552.20 8,581 14,360 557.40 18,397 84,575
552.30 8,778 15,228 557.50 18,593 86,424
552.40 8,975 16,115 557.60 18,789 88,293
552.50 9,173 17,023 557.70 18,986 90,182
552.60 9,370 17,950 557.80 19,182 92,090
552.70 9,567 18,897 557.90 19,379 94,018
552.80 9,764 19,863 558.00 19,575 95,966
552.90 9,961 20,850
553.00 10,158 21,856
553.10 10,349 22,881
553.20 10,540 23,925
553.30 10,731 24,989
553.40 10,922 26,072
553.50 11,114 27,173
553.60 11,305 28,294
553.70 11,496 29,434
553.80 11,687 30,593
553.90 11,878 31,772
554.00 12,069 32,969
554.10 12,248 34,185
554.20 12,427 35,419
554.30 12,606 36,670
554.40 12,785 37,940
554.50 12,964 39,227
554.60 13,142 40,532
554.70 13,321 41,856
554.80 13,500 43,197
554.90 13,679 44,556
555.00 13,858 45,933
555.10 14,043 47,328

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 179
Summary for Pond BMP-1: BMP #1
Inflow Area = 28.009 ac, 50.36% Impervious, Inflow Depth = 4.30" for 100yr 6hr event
Inflow = 254.17 cfs @ 2.95 hrs, Volume= 10.038 af
Outflow = 138.41 cfs @ 3.07 hrs, Volume= 10.037 af, Atten= 46%, Lag= 7.3 min
Primary = 98.29 cfs @ 3.07 hrs, Volume= 9.385 af
Routed to nonexistent node POST-POI#1
Secondary = 40.12 cfs @ 3.07 hrs, Volume= 0.653 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 559.84' @ 3.07 hrs Surf.Area= 51,603 sf Storage= 189,051 cf
Plug-Flow detention time= 263.9 min calculated for 10.037 af(100% of inflow)
Center-of-Mass det. time= 263.5 min ( 458.1 - 194.6 )
Volume Invert Avail.Storage Storage Description
#1 555.50' 223,972 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
555.50 34,578 0 0
556.00 37,559 18,034 18,034
557.00 41,209 39,384 57,418
558.00 44,809 43,009 100,427
559.00 48,473 46,641 147,068
560.00 52,204 50,339 197,407
560.50 54,057 26,565 223,972
Device Routing Invert Outlet Devices
#1 Primary 550.00' 36.0" Round RCP_Round 36"
L= 115.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 550.00' / 548.00' S= 0.0174 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 7.07 sf
#2 Device 1 555.50' 4.0" Horiz. WQ/CP Orifice C= 0.600
Limited to weir flow at low heads
#3 Device 1 557.00' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 2.00 2.00
#4 Device 1 557.50' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 559.00' 20.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 180
Primary OutFlow Max=97.91 cfs © 3.07 hrs HW=559.78' (Free Discharge)
L1=RCP Round 36" (Inlet Controls 97.91 cfs @ 13.85 fps)
2=WQ/CP Orifice (Passes < 0.87 cfs potential flow)
3=Custom Weir/Orifice (Passes < 7.81 cfs potential flow)
4=Riser (Passes < 116.24 cfs potential flow)
Secondary OutFlow Max=36.40 cfs @ 3.07 hrs HW=559.78' (Free Discharge)
LS=Broad-Crested Rectangular Weir(Weir Controls 36.40 cfs @ 2.34 fps)
Pond BMP-1: BMP #1
/� raHydrograph
/ II ❑Inflow
254.17 cfs - Outflow
2801 1 + — H 14 41 H I—1 nii IAle&= .0o9 ❑0 Primary
Secondary
260 1 1 1 1 1 1 I I I I Peak Elei✓=559.184I'
240/ /
220/ It H t1H H 1H 1 C ge711 1951c
200/ v 1 - 4 H11 11 1 11 14 H 1 1-
180- 138.41 cfs J
3 160r r ,
1 J 98.29 cfs , H H H fi 1 H 1 rt H 1 H 1 H H
r
100- P� - - 14 41 H I—1 4 14 41 4 I- H 14
80/ / 0 I
1 1
40.12 cfs40
20 ' lik ��.����� 3������AV
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 181
Pond BMP-1: BMP #1
Stage-Discharge
0 Total
0 Primary
❑Secondary
560
Broad-Crested Rectan.ular Weir �`
559 /
558
•; % Riser
w / Custom Weir/Orifice
557
556 % WQ/CP Orifice
0 20 40 60 80 100 120 140 160 180
Discharge (cfs)
Pond BMP-1: BMP #1
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 0 Surfacel
❑Storage
560
559
///
0558 II
m
W II
557
- I I I
556-'
Custom Stage Data
0 20,000 40,000 60,000 80,000 100,000 120,000 140,000 160,000 180,000 200,000 220,000
Storage(cubic-feet)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 182
Hydrograph for Pond BMP-1: BMP #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 555.50 0.00 0.00 0.00
5.00 8.22 88,245 557.73 9.58 9.58 0.00
10.00 0.00 60,830 557.08 0.69 0.69 0.00
15.00 0.00 51,311 556.85 0.49 0.49 0.00
20.00 0.00 42,875 556.64 0.45 0.45 0.00
25.00 0.00 35,156 556.45 0.41 0.41 0.00
30.00 0.00 28,166 556.27 0.37 0.37 0.00
35.00 0.00 21,919 556.10 0.33 0.33 0.00
40.00 0.00 16,426 555.96 0.28 0.28 0.00
45.00 0.00 11,701 555.83 0.24 0.24 0.00
50.00 0.00 7,759 555.72 0.20 0.20 0.00
55.00 0.00 4,633 555.63 0.14 0.14 0.00
60.00 0.00 2,681 555.58 0.08 0.08 0.00
65.00 0.00 1,705 555.55 0.04 0.04 0.00
70.00 0.00 1,146 555.53 0.03 0.03 0.00
75.00 0.00 771 555.52 0.02 0.02 0.00
80.00 0.00 518 555.51 0.01 0.01 0.00
85.00 0.00 348 555.51 0.01 0.01 0.00
90.00 0.00 234 555.51 0.01 0.01 0.00
95.00 0.00 158 555.50 0.00 0.00 0.00
100.00 0.00 106 555.50 0.00 0.00 0.00
105.00 0.00 71 555.50 0.00 0.00 0.00
110.00 0.00 48 555.50 0.00 0.00 0.00
115.00 0.00 32 555.50 0.00 0.00 0.00
120.00 0.00 22 555.50 0.00 0.00 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 183
Stage-Discharge for Pond BMP-1: BMP #1
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
555.50 0.00 0.00 0.00 558.10 29.51 29.51 0.00
555.55 0.04 0.04 0.00 558.15 32.75 32.75 0.00
555.60 0.11 0.11 0.00 558.20 36.11 36.11 0.00
555.65 0.16 0.16 0.00 558.25 39.58 39.58 0.00
555.70 0.19 0.19 0.00 558.30 43.16 43.16 0.00
555.75 0.21 0.21 0.00 558.35 46.85 46.85 0.00
555.80 0.23 0.23 0.00 558.40 50.64 50.64 0.00
555.85 0.25 0.25 0.00 558.45 54.54 54.54 0.00
555.90 0.27 0.27 0.00 558.50 58.53 58.53 0.00
555.95 0.28 0.28 0.00 558.55 62.62 62.62 0.00
556.00 0.30 0.30 0.00 558.60 66.80 66.80 0.00
556.05 0.31 0.31 0.00 558.65 71.07 71.07 0.00
556.10 0.33 0.33 0.00 558.70 75.44 75.44 0.00
556.15 0.34 0.34 0.00 558.75 79.89 79.89 0.00
556.20 0.35 0.35 0.00 558.80 84.42 84.42 0.00
556.25 0.36 0.36 0.00 558.85 89.04 89.04 0.00
556.30 0.38 0.38 0.00 558.90 92.59 92.59 0.00
556.35 0.39 0.39 0.00 558.95 92.90 92.90 0.00
556.40 0.40 0.40 0.00 559.00 93.21 93.21 0.00
556.45 0.41 0.41 0.00 559.05 94.12 93.52 0.60
556.50 0.42 0.42 0.00 559.10 95.52 93.83 1.69
556.55 0.43 0.43 0.00 559.15 97.25 94.14 3.11
556.60 0.44 0.44 0.00 559.20 99.24 94.44 4.79
556.65 0.45 0.45 0.00 559.25 101.46 94.75 6.71
556.70 0.46 0.46 0.00 559.30 103.90 95.05 8.84
556.75 0.47 0.47 0.00 559.35 106.52 95.36 11.16
556.80 0.48 0.48 0.00 559.40 109.32 95.66 13.66
556.85 0.49 0.49 0.00 559.45 112.27 95.96 16.30
556.90 0.50 0.50 0.00 559.50 115.36 96.27 19.09
556.95 0.51 0.51 0.00 559.55 118.59 96.57 22.03
557.00 0.51 0.51 0.00 559.60 121.96 96.87 25.10
557.05 0.60 0.60 0.00 559.65 125.31 97.16 28.14
557.10 0.74 0.74 0.00 559.70 128.74 97.46 31.27
557.15 0.92 0.92 0.00 559.75 132.25 97.76 34.49
557.20 1.13 1.13 0.00 559.80 135.83 98.05 37.78
557.25 1.37 1.37 0.00 559.85 139.69 98.35 41.34
557.30 1.64 1.64 0.00 559.90 143.64 98.64 45.00
557.35 1.93 1.93 0.00 559.95 147.69 98.94 48.75
557.40 2.24 2.24 0.00 560.00 151.83 99.23 52.60
557.45 2.56 2.56 0.00 560.05 156.17 99.52 56.65
557.50 2.91 2.91 0.00 560.10 160.61 99.81 60.80
557.55 3.79 3.79 0.00 560.15 165.15 100.10 65.05
557.60 5.10 5.10 0.00 560.20 169.80 100.39 69.41
557.65 6.71 6.71 0.00 560.25 174.47 100.68 73.79
557.70 8.55 8.55 0.00 560.30 179.23 100.96 78.26
557.75 10.61 10.61 0.00 560.35 184.07 101.25 82.82
557.80 12.84 12.84 0.00 560.40 189.00 101.54 87.46
557.85 15.25 15.25 0.00 560.45 193.92 101.82 92.10
557.90 17.82 17.82 0.00 560.50 198.92 102.11 96.82
557.95 20.54 20.54 0.00
558.00 23.40 23.40 0.00
558.05 26.39 26.39 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 184
Stage-Area-Storage for Pond BMP-1: BMP #1
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
555.50 34,578 0 558.10 45,175 104,926
555.55 34,876 1,736 558.15 45,359 107,190
555.60 35,174 3,488 558.20 45,542 109,462
555.65 35,472 5,254 558.25 45,725 111,744
555.70 35,770 7,035 558.30 45,908 114,035
555.75 36,069 8,831 558.35 46,091 116,335
555.80 36,367 10,642 558.40 46,275 118,644
555.85 36,665 12,467 558.45 46,458 120,962
555.90 36,963 14,308 558.50 46,641 123,290
555.95 37,261 16,164 558.55 46,824 125,626
556.00 37,559 18,034 558.60 47,007 127,972
556.05 37,741 19,917 558.65 47,191 130,327
556.10 37,924 21,808 558.70 47,374 132,691
556.15 38,106 23,709 558.75 47,557 135,065
556.20 38,289 25,619 558.80 47,740 137,447
556.25 38,472 27,538 558.85 47,923 139,839
556.30 38,654 29,466 558.90 48,107 142,239
556.35 38,837 31,403 558.95 48,290 144,649
556.40 39,019 33,350 559.00 48,473 147,068
556.45 39,202 35,305 559.05 48,660 149,497
556.50 39,384 37,270 559.10 48,846 151,934
556.55 39,566 39,244 559.15 49,033 154,381
556.60 39,749 41,227 559.20 49,219 156,837
556.65 39,931 43,219 559.25 49,406 159,303
556.70 40,114 45,220 559.30 49,592 161,778
556.75 40,297 47,230 559.35 49,779 164,262
556.80 40,479 49,249 559.40 49,965 166,756
556.85 40,662 51,278 559.45 50,152 169,259
556.90 40,844 53,316 559.50 50,339 171,771
556.95 41,027 55,362 559.55 50,525 174,293
557.00 41,209 57,418 559.60 50,712 176,824
557.05 41,389 59,483 559.65 50,898 179,364
557.10 41,569 61,557 559.70 51,085 181,913
557.15 41,749 63,640 559.75 51,271 184,472
557.20 41,929 65,732 559.80 51,458 187,041
557.25 42,109 67,833 559.85 51,644 189,618
557.30 42,289 69,943 559.90 51,831 192,205
557.35 42,469 72,062 559.95 52,017 194,801
557.40 42,649 74,190 560.00 52,204 197,407
557.45 42,829 76,327 560.05 52,389 200,022
557.50 43,009 78,473 560.10 52,575 202,646
557.55 43,189 80,628 560.15 52,760 205,279
557.60 43,369 82,792 560.20 52,945 207,922
557.65 43,549 84,965 560.25 53,131 210,574
557.70 43,729 87,147 560.30 53,316 213,235
557.75 43,909 89,338 560.35 53,501 215,905
557.80 44,089 91,537 560.40 53,686 218,585
557.85 44,269 93,746 560.45 53,872 221,274
557.90 44,449 95,964 560.50 54,057 223,972
557.95 44,629 98,191
558.00 44,809 100,427
558.05 44,992 102,672

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 185
Summary for Pond BMP-2: BMP #2
Inflow Area = 6.846 ac, 45.49% Impervious, Inflow Depth = 4.19" for 100yr 6hr event
Inflow = 61.09 cfs @ 2.95 hrs, Volume= 2.392 af
Outflow = 33.25 cfs @ 3.08 hrs, Volume= 2.392 af, Atten= 46%, Lag= 7.8 min
Primary = 28.56 cfs @ 3.07 hrs, Volume= 2.337 af
Routed to nonexistent node POST-POI#1
Secondary = 4.71 cfs @ 3.09 hrs, Volume= 0.056 af
Routed to nonexistent node POST-POI#1
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.10 hrs
Peak Elev= 579.33' @ 3.07 hrs Surf.Area= 14,368 sf Storage= 47,605 cf
Plug-Flow detention time= 656.5 min calculated for 2.390 af(100% of inflow)
Center-of-Mass det. time= 660.2 min ( 855.7 - 195.5 )
Volume Invert Avail.Storage Storage Description
#1 575.00' 57,570 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
575.00 7,651 0 0
576.00 9,115 8,383 8,383
577.00 10,693 9,904 18,287
577.50 11,523 5,554 23,841
578.00 12,385 5,977 29,818
579.00 13,864 13,125 42,943
580.00 15,391 14,628 57,570
Device Routing Invert Outlet Devices
#1 Primary 574.40' 24.0" Round RCP Round 24"
L= 88.0' RCP, square edge headwall, Ke= 0.500
Inlet/ Outlet Invert= 574.40' / 574.00' S= 0.0045 '/' Cc= 0.900
n= 0.013 Concrete sewer w/manholes & inlets, Flow Area= 3.14 sf
#2 Device 1 575.00' Sand Filter
Head (feet) 0.00 0.01 6.00
Disch. (cfs) 0.000 0.081 0.081
#3 Device 1 577.50' Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 0.50
Width (feet) 3.00 3.00
#4 Device 1 578.00' 48.0" x 48.0" Horiz. Riser C= 0.600
Limited to weir flow at low heads
#5 Secondary 579.00' 10.0' long x 16.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 186
Primary OutFlow Max=28.31 cfs © 3.07 hrs HW=579.27' (Free Discharge)
L1=RCP_Round 24" (Barrel Controls 28.31 cfs @ 9.01 fps)
2=Sand Filter (Passes < 0.08 cfs potential flow)
3=Custom Weir/Orifice (Passes < 9.09 cfs potential flow)
4=Riser (Passes < 75.22 cfs potential flow)
Secondary OutFlow Max=4.21 cfs @ 3.09 hrs HW=579.29' (Free Discharge)
LS=Broad-Crested Rectangular Weir(Weir Controls 4.21 cfs @ 1.45 fps)
Pond BMP-2: BMP #2
/� Hydrograph
/ Inflow
61.09 cfs �Q - •outflow
/ y T i I bfi&��iA� -v.V46 Ia - ■Primary
— ■Secondary
::t
I 1 ]— 4 -1 H Peak E =57-9. 33' -
557:- 4 1 1 1 1 Storage=47AO5 cf
50
4533.25 cfs
7, 40� ' LI I— L _1 1 -
2- 228.56 cfs
25- ]— 4 - 1 -
20
15 -'
z
4.71 cfs
5
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 187
Pond BMP-2: BMP #2
Stage-Discharge
❑Total
❑Primary
581
�'' ❑Secondary
580
Broad-Crested Rectangular Weir
579
Riser
0 578 Custom Weir/Orifice
w 577
576
Sand Filter
0 10 20 30 40 50 60 70 80 90 100
Discharge (cfs)
Pond BMP-2: BMP #2
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 Surface
` . ( ❑Storage
581
580:-/
i
579:-/
I I
w 577� I I ///i���� II
576:
J J
Custom Stage Data
575 , , , , , , , , L . ./
0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 50,000 55,000
Storage(cubic-feet)

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 188
Hydrograph for Pond BMP-2: BMP #2
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 575.00 0.00 0.00 0.00
5.00 1.99 28,362 577.88 2.40 2.40 0.00
10.00 0.00 23,477 577.47 0.08 0.08 0.00
15.00 0.00 22,019 577.34 0.08 0.08 0.00
20.00 0.00 20,561 577.21 0.08 0.08 0.00
25.00 0.00 19,103 577.08 0.08 0.08 0.00
30.00 0.00 17,645 576.94 0.08 0.08 0.00
35.00 0.00 16,187 576.80 0.08 0.08 0.00
40.00 0.00 14,729 576.66 0.08 0.08 0.00
45.00 0.00 13,271 576.51 0.08 0.08 0.00
50.00 0.00 11,813 576.36 0.08 0.08 0.00
55.00 0.00 10,355 576.21 0.08 0.08 0.00
60.00 0.00 8,897 576.06 0.08 0.08 0.00
65.00 0.00 7,439 575.90 0.08 0.08 0.00
70.00 0.00 5,981 575.73 0.08 0.08 0.00
75.00 0.00 4,523 575.56 0.08 0.08 0.00
80.00 0.00 3,065 575.39 0.08 0.08 0.00
85.00 0.00 1,607 575.21 0.08 0.08 0.00
90.00 0.00 149 575.02 0.08 0.08 0.00
95.00 0.00 0 575.00 0.00 0.00 0.00
100.00 0.00 0 575.00 0.00 0.00 0.00
105.00 0.00 0 575.00 0.00 0.00 0.00
110.00 0.00 0 575.00 0.00 0.00 0.00
115.00 0.00 0 575.00 0.00 0.00 0.00
120.00 0.00 0 575.00 0.00 0.00 0.00

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 189
Stage-Discharge for Pond BMP-2: BMP #2
Elevation Discharge Primary Secondary Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
575.00 0.00 0.00 0.00 580.20 66.77 32.06 34.70
575.10 0.08 0.08 0.00 580.30 71.57 32.44 39.13
575.20 0.08 0.08 0.00 580.40 76.55 32.82 43.73
575.30 0.08 0.08 0.00 580.50 81.60 33.19 48.41
575.40 0.08 0.08 0.00 580.60 86.78 33.55 53.23
575.50 0.08 0.08 0.00 580.70 92.21 33.92 58.29
575.60 0.08 0.08 0.00 580.80 97.79 34.28 63.51
575.70 0.08 0.08 0.00 580.90 103.51 34.63 68.88
575.80 0.08 0.08 0.00 581.00 109.37 34.98 74.39
575.90 0.08 0.08 0.00
576.00 0.08 0.08 0.00
576.10 0.08 0.08 0.00
576.20 0.08 0.08 0.00
576.30 0.08 0.08 0.00
576.40 0.08 0.08 0.00
576.50 0.08 0.08 0.00
576.60 0.08 0.08 0.00
576.70 0.08 0.08 0.00
576.80 0.08 0.08 0.00
576.90 0.08 0.08 0.00
577.00 0.08 0.08 0.00
577.10 0.08 0.08 0.00
577.20 0.08 0.08 0.00
577.30 0.08 0.08 0.00
577.40 0.08 0.08 0.00
577.50 0.08 0.08 0.00
577.60 0.39 0.39 0.00
577.70 0.96 0.96 0.00
577.80 1.70 1.70 0.00
577.90 2.57 2.57 0.00
578.00 3.55 3.55 0.00
578.10 5.99 5.99 0.00
578.20 9.64 9.64 0.00
578.30 14.09 14.09 0.00
578.40 19.22 19.22 0.00
578.50 24.74 24.74 0.00
578.60 25.23 25.23 0.00
578.70 25.71 25.71 0.00
578.80 26.18 26.18 0.00
578.90 26.64 26.64 0.00
579.00 27.10 27.10 0.00
579.10 28.39 27.55 0.85
579.20 30.38 27.99 2.40
579.30 32.84 28.42 4.42
579.40 35.68 28.85 6.83
579.50 38.82 29.27 9.55
579.60 42.23 29.68 12.55
579.70 45.73 30.09 15.64
579.80 49.39 30.50 18.89
579.90 53.39 30.90 22.50
580.00 57.59 31.29 26.30
580.10 62.08 31.68 30.40

Detention
Davis Village Type 11 6-hr 100yr 6hr Rainfall=5.55"
Prepared by WK Dickson Printed 4/12/2024
HydroCAD® 10.20-4a s/n 12908 ©2023 HydroCAD Software Solutions LLC Page 190
Stage-Area-Storage for Pond BMP-2: BMP #2
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
575.00 7,651 0 580.20 15,391 57,570
575.10 7,797 772 580.30 15,391 57,570
575.20 7,944 1,559 580.40 15,391 57,570
575.30 8,090 2,361 580.50 15,391 57,570
575.40 8,237 3,178 580.60 15,391 57,570
575.50 8,383 4,009 580.70 15,391 57,570
575.60 8,529 4,854 580.80 15,391 57,570
575.70 8,676 5,714 580.90 15,391 57,570
575.80 8,822 6,589 581.00 15,391 57,570
575.90 8,969 7,479
576.00 9,115 8,383
576.10 9,273 9,302
576.20 9,431 10,238
576.30 9,588 11,189
576.40 9,746 12,155
576.50 9,904 13,138
576.60 10,062 14,136
576.70 10,220 15,150
576.80 10,377 16,180
576.90 10,535 17,226
577.00 10,693 18,287
577.10 10,859 19,365
577.20 11,025 20,459
577.30 11,191 21,570
577.40 11,357 22,697
577.50 11,523 23,841
577.60 11,695 25,002
577.70 11,868 26,180
577.80 12,040 27,375
577.90 12,213 28,588
578.00 12,385 29,818
578.10 12,533 31,064
578.20 12,681 32,325
578.30 12,829 33,600
578.40 12,977 34,890
578.50 13,125 36,195
578.60 13,272 37,515
578.70 13,420 38,850
578.80 13,568 40,199
578.90 13,716 41,563
579.00 13,864 42,943
579.10 14,017 44,337
579.20 14,169 45,746
579.30 14,322 47,170
579.40 14,475 48,610
579.50 14,628 50,065
579.60 14,780 51,536
579.70 14,933 53,021
579.80 15,086 54,522
579.90 15,238 56,039
580.00 15,391 57,570
580.10 15,391 57,570