SW3200702_2020-09-02 Drainage and Erosion Calculation Package_20200910

DRAINAGE & EROSION CONTROL CALCULATIONS
for
S Main Street Townhomes
Granite Quarry, North Carolina
Revised September 2, 2020
Prepared for:
PresPro, LLC
62oo Hudspeth Road
Harrisburg, NC 28207
z
Bluestone Land Management, PLLC
P-1444
Office: [phone]
Cell: [phone]
Physical Address: Mailing Address:
47o North Broad Street, Suite A 115 Autumn Frost Avenue
Mooresville, NC 28115 Statesville, NC 28677

NARRATIVE
S Main Street Townhomes is a 24 lot townhome project located in Granite Quarry, North
Carolina. The work will include clearing, stripping, erosion & sediment control, storm sewer
construction, grading, and gravel installation.
The stormwater control measure chosen to treat for water quality and detention was a sand
filter. The sand filter has been designed to treat the first 1" of rainfall for water quality. It has
also been designed to reduce the post development runoff for the 2-year and io-year storm
events based on the NRCS method using a HydroCAD model.
Bluestone Land Management, PLLC

PRECIPITATION DATA
Bluestone Land Management, PLLC

Precipitation Frequency Data Server
NOAA Atlas 14, Volume 2, Version 3
Location name: Salisbury, North Carolina, USA* 1
Latitude: 35.6134*, Longitude:-80.4392*
Elevation: 797.03 ft**
*source: ESRI Maps 'w,�w, t
source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hourp
Duration
Average recurrence interval (years)
1
2
5
10
25
50
1 100
100
200
500
1000
4.66
5.51
6.42
7.06
7.76
8.23
8.64
8.99
9.35
9.58
5-min
(4.30-5.05) 1
1 (5.90-6.98) 11
(6.48-7.66) 11
(7.09-8.40)
1 (7.49-8.92)
1 (7.81-9.36)
1 (8.09-9.74)
1 (8.33-10.2)
1 (8.47-10.4)
3.72
4.40
5.14
5.65
6.18
6.55
6.86
7.12
7.39
7.54
10-min
(3.43-4.04)
(4.06-4.79)
1 (5.18-6.12) 11
(5.65-6.70)
1 (5.96-7.10)
1 (6.20-7.43)
1 (6.41-7.73)
1 (6.59-8.03)
1 (6.67-8.21)
3.10
3.69
4.34
4.76
5.22
5.53
5.78
5.99
6.20
6.31
15-min
(2.86-3.36) 11
(3.41-4.02) 11
(3.99-4.72) 11
(4.37-5.16) 11
(4.77-5.66)
1 (5.03-5.99)
1 (5.23-6.27)
1 (5.39-6.50)
1 (5.53-6.74)
1 (5.58-6.87)
2.13
2.55
3.08
3.45
3.87
4.16
4.43
4.66
4.93
5.11
30-min
(1.96-2.31) 11
(2.35-2.78) 11
(2.83-3.35)
(3.16-3.74) 11
(3.54-4.19)
1 (3.79-4.51)
1 (4.00-4.80)
1 (4.20-5.06)
1 (4.40-5.36)
1 (4.52-5.56)
1.33
1.60
1.98
2.25
2.58
2.82
3.05
3.27
3.54
3.73
60-min
(1.22-1.44) 11
(1.48-1.74)
(1.82-2.15)
1 (2.35-2.79)
1 (2.57-3.06)
1 (2.76-3.31)
1 (2.94-3.55)
1 (3.16-3.85)
1 (3.30-4.06)
0.765
F 0.926
1.15
1.32
1.53
1.69
1.85
2.00
2.19
2.33
2-hr
(0.704-0.834)
(0.850-1.01) 1
1 (1.39-1.67)
(1.53-1.84)
1 (1.66-2.01)
1 (1.78-2.18)
1 (1.94-2.39)
1 (2.04-2.55)
0.542
0.655
0.818
0.940
1.10
113
1.35
1.47
1.63
1.75
3-hr
(0.499-0.592)
(0.603-0.716)
(0.751-0.893)
(0.860-1.02)
(1.00-1.20)
1 (1.11-1.33)
1 (1.21-1.46)
1 (1.31-1.60)
1 (1.44-1.78)
1 (1.53-1.91)
0.330
0.397
0.496
0.572
0.673
0.753
F 0.833
F 0.913
1.02
1.10
6-hr
(0.303-0.360)
(0.366-0.434)
(0.455-0.541)
(0.523-0.623)
(0.612-0.731)
(0.680-0.817)
(0.746-0.903)
(0.810-0.990)
(0.893-1.11)
(0.954-1.20)
0.193
0.233
0.292
0.339
0.402
0.453
0.504
0.557
0.630
0.687
12-hr
(0.178-0.211)
(0.214-0.255)
(0.268-0.319)
(0.310-0.369)
(0.365-0.436)
(0.408-0.490)
(0.450-0.545)
(0.492-0.602)
(0.547-0.679)
(0.588-0.741)
0.116
0.140
0.175
0.203
0.241
0.271
0.301
0.333
0.376
0.409
24-hr
(0.108-0.124)
(0.130-0.150)
(0.163-0.188)
(0.189-0.218)
(0.223-0.258)
(0.251-0.290)
(0.278-0.323)
(0.307-0.357)
(0.345-0.404)
(0.374-0.440)
0.067
0.081
0.101
0.116
0.137
0.154
0.170
0.188
0.211
0.229
2-day
(0.063-0.072)
(0.076-0.087)
(0.094-0.108)
(0.108-0.124)
(0.128-0.146)
(0.143-0.164)
(0.158-0.182)
(0.173-0.201)
(0.194-0.226)
(0.210-0.246)
0.048
0.057
0.071
0.082
0.096
0.108
0.119
0.131
0.148
0.160
3-day
(0.045-0.051)
(0.054-0.061)
(0.066-0.076)
(0.076-0.087)
(0.090-0.103)
(0.100-0.115)
(0.111-0.128)
(0.121-0.140)
(0.136-0.158)
(0.147-0.172)
0.038
0.045
0.056
0.064
0.076
0.085
0.094
0.103
0.116
0.126
4-day
(0.036-0.040)
(0.043-0.048)
(0.052-0.060)
(0.060-0.069)
(0.071-0.081)
(0.079-0.090)
(0.087-0.100)
(0.095-0.110)
(0.107-0.124)
(0.116-0.135)
0.025
0.030
0.036
0.041
0.048
0.054
0.059
0.065
0.073
0.079
7-day
(0.024-0.027)
(0.028-0.032)
(0.034-0.038)
(0.039-0.044)
(0.045-0.051)
(0.050-0.057)
(0.055-0.063)
(0.061-0.069)
(0.068-0.078)
(0.073-0.085)
0.020
0.024
0.028
0.032
0.037
0.041
0.045
0.049
0.054
0.059
10-day
(0.019-0.021)
(0.022-0.025)
(0.027-0.030)
(0.030-0.034)
(0.035-0.039)
(0.039-0.043)
(0.042-0.048)
(0.046-0.052)
(0.051-0.058)
(0.055-0.062)
0.013
0.016
0.019
0.021
0.024
0.026
0.029
0.031
0.034
0.037
20-day
(0.013-0.014)
(0.015-0.017)
(0.018-0.020)
(0.020-0.022)
(0.023-0.025)
(0.025-0.028)
(0.027-0.030)
(0.029-0.033)
(0.032-0.036)
(0.034-0.039)
0.011
0.013
0.015
0.017
0.019
0.020
0.022
0.024
0.026
0.027
30-day
(0.011-0.012)
(0.012-0.014)
(0.014-0.016)
(0.016-0.017)
(0.018-0.020)
(0.019-0.021)
(0.021-0.023)
(0.022-0.025)
(0.024-0.027)
(0.026-0.029)
0.009
0.011
0.012
0.014
0.015
0.016
0.017
0.019
0.020
0.021
45-day
(0.009-0.010)
(0.010-0.011)
(0.012-0.013)
(0.013-0.014)
(0.014-0.016)
(0.016-0.017)
(0.017-0.018)
(0.018-0.019)
(0.019-0.021)
(0.020-0.022)
0.008
0.010
0.011
0.012
0.013
0.014
0.015
0.016
0.017
0.018
60-day
(0.008-0.009)
(0.009-0.010)
(0.010-0.011)
(0.011-0.012)
(0.013-0.014)
(0.013-0.015)
(0.014-0.015)
(0.015-0.016)
(0.016-0.018)
(0.017-0.018)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.6134&Ion=-80.4392&data=intensity&units=english&series=pds 1 /4

SKIMMER BASIN
Bluestone Land Management, PLLC

Selection of Sediment Control Measure SK-1
2.40 Total Drainage Area User entry
Do Not Use Temporary Sediment Trap Calculated Value
Okay Skimmer Sediment Basin
Okay Temporary Sediment Basin
2.40 Disturbed Area (Acres)
10.1664 Peak Flow from 10-year Storm (cfs) = CIA = 0.60 7.06 2.4
5MIN TC
Updated to comply with NPDES Permit Conditions
TGH and BRB 07/03/2012

Skimmer Basin sK-1
Okay
2.40 Disturbed Area (Acres)
10.1664 Peak Flow from 10-year Storm (cfs)
4320 Required Volume ft3
3304 Required Surface Area ft2
40.6 Suggested Width ft
81.3 Suggested Length ft
45 Trial Top Width at Spillway Invert ft
88 Trial Top Length at Spillway Invert ft
3 Trial Side Slope Ratio Z:1
4 Trial Depth ft (2 to 3.5 feet above grade)
20.5 Bottom Width ft
64 Bottom Length ft
1312 Bottom Area ft2
10072 Actual Volume ft3 Okay
3916 Actual Surface Area ft2 Okay
10 Trial Weir Length ft
0.5 Trial Depth of Flow ft
10.6 Spillway Capacity cfs Okay
2 Skimmer Size (inches)
0.167 Head on Skimmer (feet)
1.25 Orifice Size (1/4 inch increments)
2.93 Dewatering Time (days)
Suggest about 3 days
Skimmer Size
(Inches)
1.5
ON

TEMPORARY DITCHES
Bluestone Land Management, PLLC

3/31 /2020
NORTH
AMERICAN
GREEN
CHANNEL ANALYSIS
>> > TD-1
Name
TD-1
Discharge
5.51
Peak Flow Period
1
Channel Slope
0.01
Channel Bottom Width
0
Left Side Slope
3
Right Side Slope
3
Low Flow Liner
Retardence Class
C 6-12 in
Vegetation Type
Mix (Sod and Bunch)
Vegetation Density
Good 75-95%
Soil Type
Clay Loam (CL)
Unreinforced Vegetation
North American Green
5401 St. Wendel -Cynthiana Rd.
Poseyville, Indiana 47633
Tel. [phone]
> Fax [phone]
www.nagreen.com
ECMDS v7.0
Normal Permissable Calculated Safety Staple
Phase Reach Discharge Velocity Mannings N Remarks
Depth Shear Stress Shear Stress I Factor Pattern
Jnreinforced Straight 5.51 cfs 1.38 ft/s 1.15 ft 0.072 4 Ibs/ft2 0.72 Ibs/ft2 5.56 STABLE
Vegetation
Underlying Straight 5.51 cfs 1.38 ft/s 1.15 ft 0.072 11.67 Ibs/ft2 0.34 Ibs/ft2 34.19 STABLE
Substrate
https://ecmds.com/project/l 43698/channel-analysis/181267/show 1 /1

3/31 /2020
NORTH
AMERICAN
GREEN
CHANNEL ANALYSIS
>> > TD-2
Name
TD-2
Discharge
2.33
Peak Flow Period
1
Channel Slope
0.01
Channel Bottom Width
0
Left Side Slope
3
Right Side Slope
3
Low Flow Liner
Retardence Class
C 6-12 in
Vegetation Type
Mix (Sod and Bunch)
Vegetation Density
Good 75-95%
Soil Type
Clay Loam (CL)
Unreinforced Vegetation
North American Green
5401 St. Wendel -Cynthiana Rd.
Poseyville, Indiana 47633
Tel. [phone]
> Fax [phone]
www.nagreen.com
ECMDS v7.0
Normal Permissable Calculated Safety Staple
Phase Reach Discharge Velocity Mannings N Remarks
Depth Shear Stress Shear Stress I Factor Pattern
Jnreinforced Straight 2.33 cfs 1.02 ft/s 0.87 ft 0.081 4 Ibs/ft2 0.54 Ibs/ft2 7.36 STABLE
Vegetation
Underlying Straight 2.33 cfs 1.02 ft/s 0.87 ft 0.081 14.61 Ibs/ft2 0.26 Ibs/ft2 56.66 STABLE
Substrate
https://ecmds.com/project/l 43698/channel-analysis/181268/show 1 /1

DRAINAGE CALCULATIONS
Bluestone Land Management, PLLC

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RIP RAP APRONS
Bluestone Land Management, PLLC

RIP RAP APRON
Project Name: S Main Steet Townhomes
Project Number: 2019-0027
APRON:
A-1
FES-1
DISCHARGE
=
6.57
CFS
PIPE DIAMETER =
24
inches
d50 =
9
inches
Figure 8.06a NCDENR Design manual
LENGTH =
12
feet
Figure 8.06a NCDENR Design manual
WIDTH =
14
feet
dMAX
= d50 * 1.5
13.5
inches
THICKNESS
= dMAX * 1.5
15.0
inches
APRON:
A-2
CS-1
DISCHARGE
=
5.15
CFS
PIPE DIAMETER =
15
inches
d50 =
9
inches
Figure 8.06a NCDENR Design manual
LENGTH =
10
feet
Figure 8.06a NCDENR Design manual
WIDTH =
11
feet
dMAX
= d50 * 1.5
13.5
inches
THICKNESS
= dMAX * 1.5
15.0
inches
1 of 1

BMP CALCULATIONS
Bluestone Land Management, PLLC

South Main Street Townhomes - BMP-1 SF
Granite Quarry, NC
Sand Filter Design
I. Determine Water Quality Volume, WQV
Drainage Area, Ad
2.19
Ac
% Impervious
54%
54
Rainfall, Ra
1.00
Ins
0.08
Ft
Volumetric Runoff Coefft, Rv
0.54
Water Quality Volume, WQV
0.10
Ac-Ft
4,285.22
Cf
Adjusted Water Quality Volume, WQVadj
0.07
Ac-Ft
3,213.91
Cf
II. Determine Maximum Head for Sand Filter, Hmax
WQVadj
3,213.91
Cf
Hmax
2.0
Ft
3.0
Ft
4.0
Ft
5.0
Ft
6.0
Ft
Respective Values for As + Af w/Hmax
1,606.96
Sf
1,071.30
Sf
803.48
Sf
642.78
Sf
535.65
Sf
III. Determine Sedimentation Basin Surface Area, As
Drainage Area, Ad
2.19
Ac
Volumetric Runoff Coefft, Rv
0.54
Min.Sedimentation Basin Surface Area, As
283.32
Sf
IV. Determine Sand Filter Bed Surface Area, Af
Water Quality Volume, WQV
4,285.22
Cf
Depth of Sand Filter, Df
1.5
Ft
Coefft of Permeability, k
3.5
Ft/Day
Time to Drain WQV
40
Hrs
1.67
Days
Hmax
2.0
Ft
Ave Head, Ha
1.0
Ft
Min. Sand Filter Bed Surface Area, Af
440.76
Sf
Total Min. As + Af
724.08
Sf
Available Area for Sand Filter, At
725
Sf
IMP 1.19
[Rv = 0.05+0.009(%Imp)]
[WQV = Rv(Ad)(Ra)]
[WQVadj = 0.75WQV]
[As = 240 Rv Ad Ra]
[Min. Value]
Page 1 of 4

South Main Street Townhomes - BMP-1 SF
Granite Quarry, NC
Sand Filter Design
V. Review Containment of WQV
Design Data
Af 441.32
Sf [Af = (Af/(Af+AS) *At]
As 283.68
Sf [As = (As/(Af+AS) *At]
Hmax 2.0
Ft
Ha 1.0
Ft
WQVadj 3,213.91
Cf
Provided Storage Volume, Vs 10,448.00 Cf [(Af + As)Hmax]
WQV <= Vs YES
Page 2 of 4

South Main Street Townhomes
15-Jul-20
ANTIFLOATATION
CONCRETE RISER BOX (OUTSIDE D1, INSIDE D2) 5.00 FT 4.00 FT
HEIGHT OF BOX (Hl) 6.00 FT
WT OF WATER DISPLACED 10,296.00 LB T
D, xD, xH, x62.4 Ib/cfx 1.1
WT OF RISER BOX-8,100.00 LB
((Dl x Dl)-(D2 x DA x H, x 150 Ib/cf
BLOCK DIM (LENGTH Ll, WIDTH W1, THICK T1) 6.00 FT 6.00 FT
WT OF BLOCK
L, x W, x T, x 150 Ib/cf-5,400.00 LB
TOTAL-3,204.00 LB
1.00

1 pre
0
ol
Subcat Reach on Link

BMP-1-Sand Filter Type 11 24-hr 1 yr,24hr type 11 storm Rainfall=2.77"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 1 pre: BMP-1 PRE
Runoff = 0.86 cfs @ 11.99 hrs, Volume= 0.054 af, Depth= 0.31"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr lyr,24hr type II storm Rainfall=2.77"
Area (ac) CN Description
2.065 61 Pasture/grassland/range, Good, HSG B
0.035 98 Paved parking, HSG B
2.100 62 Weighted Average
2.065 98.33% Pervious Area
0.035 1.67% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 pre: BMP-1 PRE
Hydrograph
0.95
0.9
------
I
--'- 0.86ds
- - - - - -- --
I I
--'-- --
I
--1--L--r--1---1---1---1---1--J--1--L--L--L--+--------'--
I
I
I
I I I I I I I I I I
0.85
0.8
-----'-
-----I-
-'---'---'---'---'--'---'---'---'---'---'---'---'---'--'---'---'---'---'---'---'---
----I-- --
--
-------------------------
-- -- -- -- ypelfN-hr_
0.75
- -'I- - -'I-
-'I- - -'I - - -
- -
- -
-- -
-- -
-'I- - -'I- - -'I- --lyr,�44r type 1storM-Rainfall=2_77"
0.7
--' --I-
------=--=--T--T--
--'
--' --------I-- --_T TR*noff Area 2.100-Oc
0.65
--' --I-
------=--=--T--T--T--'
--'----------T--T-Runoff Volumer945AI,4
0.6
-----I-
------y--y--rt--T--r----------------y-----T-4�unof-bepth=0.ar
-� 0.55
w
------
------ --
--
--+--
----------------+--+--+--r--
--=S:QY"irr
0.5
-----'-
----'-- --
--
--
--
--------------'--
-- -- -- -- ------CN—�2
0 045
-----'-
----'-- --
--1--L--L--1---1---1---1---1--J--1--L--1--L--
-----'- --
LL
0.4
-----'-
-'---'-----------------'---'---'---'---'-----------------'---'---'---'---
0.35
-----'-
-'---'---'---'---'--'---'---'---'---'---'---'---'---'--'---'---'---'---'---'---'---
0.3
-----II-
----I---------------------------------------------------I---
0.25
-- --r
0.2
r--I-
I---I--r--r--r--r--r--r--r--r--I---I--r--r--r--r--r--r--r--r--I--
0.15
--Ir--li-
-li---li-- --
--rt--T--r--Ir--Ir--Ir--li---li--
--rt--T--r--r--Ir--Ir--Ir--li--
0.05
-------
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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 10yr,24hrtype 11 storm Rainfall=4.87"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 1 pre: BMP-1 PRE
Runoff = 5.18 cfs @ 11.97 hrs, Volume= 0.238 af, Depth= 1.36"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 10yr,24hr type II storm Rainfall=4.87"
Area (ac) CN Description
2.065 61 Pasture/grassland/range, Good, HSG B
0.035 98 Paved parking, HSG B
2.100 62 Weighted Average
2.065 98.33% Pervious Area
0.035 1.67% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 pre: BMP-1 PRE
Hydrograph
5.18 cfs
ype r
10yr,24hr4ype II storm Rainfall-4k"
I I I 1 1 Runoff Area=2.100 ac
- - L--L--L--L--L--L--L--L-- RupofF'Volume=0.38;a
Runoff De'Ipthy1.3',6"
Tic=5,0 min
-I---I---I---I---I--L--1--1--1--L--L--L--L--I---I---I---I---'--L-- iF
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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 25yr,24hrtype 11 storm Rainfall=5.78"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 1 pre: BMP-1 PRE
Runoff = 7.52 cfs @ 11.97 hrs, Volume= 0.340 af, Depth= 1.94"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 25yr,24hr type II storm Rainfall=5.78"
Area (ac) CN Description
2.065 61 Pasture/grassland/range, Good, HSG B
0.035 98 Paved parking, HSG B
2.100 62 Weighted Average
2.065 98.33% Pervious Area
0.035 1.67% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 pre: BMP-1 PRE
Hydrograph
- ;-- --+ --r--r--r--r----------------=--=--=--
i 7.52 cfs
------ -------------------------------------'--- Typ_e_Ii 24.,hr
25yr,24hriype II storm Rainfall=5.76"
Runoff Area=2.100 ac
,Runoff Vol4mo=0.,340',af
Runoff De',pthy1.94"
Tc=5'0 min
dN=62
i --r--r -r--i---i---i---i--r--+--+--+--r--r--r--r--r--i---i---i---i--r--r--r--
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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 50yr,24hrtype 11 storm Rainfall=6.50"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 1 pre: BMP-1 PRE
Runoff = 9.50 cfs @ 11.97 hrs, Volume= 0.427 af, Depth= 2.44"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 50yr,24hr type II storm Rainfall=6.50"
Area (ac) CN Description
2.065 61 Pasture/grassland/range, Good, HSG B
0.035 98 Paved parking, HSG B
2.100 62 Weighted Average
2.065 98.33% Pervious Area
0.035 1.67% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 pre: BMP-1 PRE
Hydrograph
9.50cfs--------- -
----- -- a-- -- -- -- -- -- -- ----------------
-- ------------------- -- -- ----+--+----+--+-- -- ---Typelll-24»hr-
50yr,24hr type 11 storm kainfall=/6..�50"
{--r--I--I---------I---I---I--1--7--7--7--T--T--T--T--T-RU off ATea�=2j ac-
'Rurhoff VoIumo=0.427'Iof
I I Ru'Inoflf De'Ipthy2.44"
I Tc=5,0 min
dN=62
{ --r--r -r--I---I---I---I---I--r--r--r--r--r--r--r--r--r--r--r--r--r--r--I---
i i I I I I I I i i i i i i i i i i I I I 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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 100yr,24hrtype 11 storm Rainfall=7.23"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 6
Summary for Subcatchment 1 pre: BMP-1 PRE
Runoff = 11.59 cfs @ 11.96 hrs, Volume= 0.520 af, Depth= 2.97"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 100yr,24hr type II storm Rainfall=7.23"
Area (ac) CN Description
2.065 61 Pasture/grassland/range, Good, HSG B
0.035 98 Paved parking, HSG B
2.100 62 Weighted Average
2.065 98.33% Pervious Area
0.035 1.67% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 pre: BMP-1 PRE
Hydrograph
11.59cfs---------------r--r- r--r--r--r--r--r--r--r--r-----------i---
--r---------------------y-- -- -- --t--t--t--t--t--r--r---Type Hl24;hr-
100yr,24hr type II storm Rainfall=7.23"
Runoff Area=2.100 ac
�--L--�-
- J--1--1--1--1--1--L--L--L--LRu'noffDepthy2.07"_
Tic=5,0 min
- - -----------'---dry='62-
--i --i -i-----------------------------r--i --i --i --i --i---i---i---i---
--r--r -r--i---i---i---i---i--r--r--r--r--r--r--r--r--r--r--r--i---i---i---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)
— Runoff

1 post) —�
BMP-1 POST
Subcat Reach on Link
Swcm 1

BMP-1-SandFilter
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCADO 10.00-16 s/n 09319 © 2015 HydroCAD Software Solutions LLC Page 2
Pipe Listing (selected nodes)
Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill
Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches)
1 1 P 808.50 807.48 56.3 0.0181 0.011 15.0 0.0 0.0

BMP-1-Sand Filter Type 11 24-hr 1 yr,24hr type 11 storm Rainfall=2.77"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 1 post: BMP-1 POST
Runoff = 4.63 cfs @ 11.96 hrs, Volume= 0.208 af, Depth= 1.14"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr lyr,24hr type II storm Rainfall=2.77"
Area (ac) CN Description
1.190
98 Paved parking, HSG B
1.000
61 >75% Grass cover, Good, HSG B
2.190
81 Weighted Average
1.000
45.66% Pervious Area
1.190
54.34% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 post: BMP-1 POST
Hydrograph
4.63 cfs
type IfN-hr
-- -- -- -- -- -- lyr,24hrtype�ll_stor_rp Rainfal11=23,7"
ROnofF Ateal2.1',90 0c
Runoff Volume�-0.208 laf
Runoff Depth=1.14"
i --r--r-r--i---i---i---i--r--r--r--r--r--r--r--r--r--i---i---r
Tq—FJ..q rgin
CN=81
' -----F- '-------------- -- -- --'--' --' --' --' --'---'---'---'---'--'--'--'--
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)
— Runoff

BMP-1-Sand Filter Type 11 24-hr 1 yr,24hr type 11 storm Rainfall=2.77"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 4
Summary for Pond 1 P: SWCM 1
Inflow Area = 2.190 ac, 54.34% Impervious, Inflow Depth = 1.14" for 1yr,24hr type II storm event
Inflow = 4.63 cfs @ 11.96 hrs, Volume= 0.208 of
Outflow = 0.50 cfs @ 12.39 hrs, Volume= 0.208 af, Atten= 89%, Lag= 25.8 min
Primary = 0.50 cfs @ 12.39 hrs, Volume= 0.208 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Peak Elev= 813.32' @ 12.39 hrs Surf.Area= 2,499 sf Storage= 3,500 cf
Plug -Flow detention time= 75.4 min calculated for 0.208 of (100% of inflow)
Center -of -Mass det. time= 75.4 min ( 918.2 - 842.7 )
Volume Invert Avail.Storage Storage Description
#1 811.50' 10,448 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
811.50 1,344 0 0
815.50 3,880 10,448 10,448
Device Routing Invert Outlet Devices
#1 Primary 811.50' 2.000 in/hr Exfiltration over Surface area
#2 Primary 808.50' 15.0" Round 15-IN Culvert
L= 56.3' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 808.50' / 807.48' S= 0.0181 T Cc= 0.900
n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf
#3 Device 2 811.50' 3.0" Horiz. 3-IN C= 0.600 Limited to weir flow at low heads
#4 Device 2 813.25' 12.0" W x 12.0" H Vert. 12-in x 12-in orifice C= 0.600
#5 Device 2 814.75' 48.0" x 48.0" Horiz. 5-ft x 5-ft Box C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=0.50 cfs @ 12.39 hrs HW=813.32' (Free Discharge)
�1=Exfiltration (Exfiltration Controls 0.12 cfs)
__2=154N Culvert (Passes 0.38 cfs of 12.10 cfs potential flow)
�3=34N (Orifice Controls 0.32 cfs @ 6.50 fps)
4=12-in x 12-in orifice (Orifice Controls 0.06 cfs @ 0.86 fps)
5=5-ft x 5-ft Box ( Controls 0.00 cfs)

BMP-1-Sand Filter Type 11 24-hr 1 yr,24hr type 11 storm Rainfall=2.77"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 5
Pond 1 P: SWCM 1
Hydrograph
4.63 cfs
InfIgw Area'2.'190'ac
-----i-------------+--r---------------------+--+---------i---i
Peak EIev=813.32'
StorageT3'a500', cf
I --r--r-i---i--r--r--r--r--r--r--r--r--i---i--r--r--r--r--r--r--r--r
0.50 cis
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)
— Inflow
Primary

BMP-1-Sand Filter Type 11 24-hr 1 yr,24hr type 11 storm Rainfall=2.77"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 6
Elevation Primary
(feet)
(Cfs)
811.50
0.00
811.52
0.07
811.54
0.08
811.56
0.10
811.58
0.12
811.60
0.14
811.62
0.15
811.64
0.15
811.66
0.16
811.68
0.17
811.70
0.17
811.72
0.18
811.74
0.19
811.76
0.19
811.78
0.20
811.80
0.20
811.82
0.21
811.84
0.21
811.86
0.21
811.88
0.22
811.90
0.22
811.92
0.23
811.94
0.23
811.96
0.24
811.98
0.24
812.00
0.24
812.02
0.25
812.04
0.25
812.06
0.26
812.08
0.26
812.10
0.26
812.12
0.27
812.14
0.27
812.16
0.27
812.18
0.28
812.20
0.28
812.22
0.28
812.24
0.29
812.26
0.29
812.28
0.29
812.30
0.30
812.32
0.30
812.34
0.30
812.36
0.31
812.38
0.31
812.40
0.31
812.42
0.32
812.44
0.32
812.46
0.32
812.48
0.32
812.50
0.33
812.52
0.33
812.54
0.33
Stage -Discharge for Pond 1 P: SWCM 1
Elevation Primary
(feet)
(Cfs)
812.56
0.34
812.58
0.34
812.60
0.34
812.62
0.35
812.64
0.35
812.66
0.35
812.68
0.35
812.70
0.36
812.72
0.36
812.74
0.36
812.76
0.36
812.78
0.37
812.80
0.37
812.82
0.37
812.84
0.38
812.86
0.38
812.88
0.38
812.90
0.38
812.92
0.39
812.94
0.39
812.96
0.39
812.98
0.39
813.00
0.40
813.02
0.40
813.04
0.40
813.06
0.40
813.08
0.41
813.10
0.41
813.12
0.41
813.14
0.41
813.16
0.42
813.18
0.42
813.20
0.42
813.22
0.42
813.24
0.43
813.26
0.43
813.28
0.45
813.30
0.47
813.32
0.49
813.34
0.52
813.36
0.56
813.38
0.59
813.40
0.63
813.42
0.67
813.44
0.71
813.46
0.76
813.48
0.81
813.50
0.86
813.52
0.91
813.54
0.96
813.56
1.02
813.58
1.07
813.60
1.13
Elevation Primary
(feet)
(Cfs)
813.62
1.19
813.64
1.25
813.66
1.32
813.68
1.38
813.70
1.45
813.72
1.51
813.74
1.58
813.76
1.65
813.78
1.72
813.80
1.80
813.82
1.87
813.84
1.95
813.86
2.02
813.88
2.10
813.90
2.18
813.92
2.26
813.94
2.34
813.96
2.43
813.98
2.51
814.00
2.59
814.02
2.68
814.04
2.77
814.06
2.86
814.08
2.94
814.10
3.04
814.12
3.13
814.14
3.22
814.16
3.31
814.18
3.41
814.20
3.50
814.22
3.60
814.24
3.70
814.26
3.79
814.28
3.88
814.30
3.96
814.32
4.04
814.34
4.11
814.36
4.18
814.38
4.25
814.40
4.32
814.42
4.39
814.44
4.45
814.46
4.52
814.48
4.58
814.50
4.64
814.52
4.71
814.54
4.77
814.56
4.82
814.58
4.88
814.60
4.94
814.62
5.00
814.64
5.05
814.66
5.11
Elevation Primary
(feet)
(Cfs)
814.68
5.16
814.70
5.21
814.72
5.27
814.74
5.32
814.76
5.42
814.78
5.69
814.80
6.06
814.82
6.49
814.84
6.99
814.86
7.53
814.88
8.12
814.90
8.76
814.92
9.43
814.94
10.15
814.96
10.90
814.98
11.68
815.00
12.49
815.02
13.34
815.04
14.22
815.06
14.56
815.08
14.59
815.10
14.61
815.12
14.64
815.14
14.66
815.16
14.69
815.18
14.71
815.20
14.73
815.22
14.76
815.24
14.78
815.26
14.81
815.28
14.83
815.30
14.86
815.32
14.88
815.34
14.91
815.36
14.93
815.38
14.95
815.40
14.98
815.42
15.00
815.44
15.03
815.46
15.05
815.48
15.07
815.50
15.10

BMP-1-Sand Filter Type 11 24-hr 1 yr,24hr type 11 storm Rainfall=2.77"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 7
Stage -Area -Storage for Pond 1 P: SWCM 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
811.50
1,344
0
811.55
1,376
68
811.60
1,407
138
811.65
1,439
209
811.70
1,471
281
811.75
1,503
356
811.80
1,534
432
811.85
1,566
509
811.90
1,598
588
811.95
1,629
669
812.00
1,661
751
812.05
1,693
835
812.10
1,724
921
812.15
1,756
1,008
812.20
1,788
1,096
812.25
1,820
1,186
812.30
1,851
1,278
812.35
1,883
1,371
812.40
1,915
1,466
812.45
1,946
1,563
812.50
1,978
1,661
812.55
2,010
1,761
812.60
2,041
1,862
812.65
2,073
1,965
812.70
2,105
2,069
812.75
2,137
2,175
812.80
2,168
2,283
812.85
2,200
2,392
812.90
2,232
2,503
812.95
2,263
2,615
813.00
2,295
2,729
813.05
2,327
2,845
813.10
2,358
2,962
813.15
2,390
3,081
813.20
2,422
3,201
813.25
2,454
3,323
813.30
2,485
3,446
813.35
2,517
3,571
813.40
2,549
3,698
813.45
2,580
3,826
813.50
2,612
3,956
813.55
2,644
4,087
813.60
2,675
4,220
813.65
2,707
4,355
813.70
2,739
4,491
813.75
2,771
4,629
813.80
2,802
4,768
813.85
2,834
4,909
813.90
2,866
5,052
813.95
2,897
5,196
814.00
2,929
5,341
814.05
2,961
5,488
814.10
2,992
5,637
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
814.15
3,024
5,788
814.20
3,056
5,940
814.25
3,088
6,093
814.30
3,119
6,248
814.35
3,151
6,405
814.40
3,183
6,564
814.45
3,214
6,723
814.50
3,246
6,885
814.55
3,278
7,048
814.60
3,309
7,213
814.65
3,341
7,379
814.70
3,373
7,547
814.75
3,405
7,716
814.80
3,436
7,887
814.85
3,468
8,060
814.90
3,500
8,234
814.95
3,531
8,410
815.00
3,563
8,587
815.05
3,595
8,766
815.10
3,626
8,947
815.15
3,658
9,129
815.20
3,690
9,313
815.25
3,722
9,498
815.30
3,753
9,685
815.35
3,785
9,873
815.40
3,817
10,063
815.45
3,848
10,255
815.50
3,880
10,448

BMP-1-Sand Filter Type 1124-hr 10yr,24hrtype 11 storm Rainfall=4.87"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 1 post: BMP-1 POST
Runoff = 11.45 cfs @ 11.96 hrs, Volume= 0.524 af, Depth= 2.87"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 10yr,24hr type II storm Rainfall=4.87"
Area (ac) CN Description
1.190
98 Paved parking, HSG B
1.000
61 >75% Grass cover, Good, HSG B
2.190
81 Weighted Average
1.000
45.66% Pervious Area
1.190
54.34% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 post: BMP-1 POST
Hydrograph
--- - - I - - -- - - - - - - - - - - - - - - - - - - - - - - I --
I 11.45 cfs I I I I I I I I I I I I I I I I I I I I
-----'I- --------------------- -- -- -- -- ------------------Typetl-Z4;hr-
-------------------------'I-- I'I-- I'I-- I'I-- I'I -10 r�24hrYtyp _11 storm kainfa11=4.87"
Runoff Area=2.190 ac
Y--Y--Y--Y--IRUl��11off YolAlUmo-V.P2411a
--+--II-----------------II-- -- -- -- --+--+-- --+--+--I Ru1p9ff�Delptht -
Tic=5,0 min
i-----I--------------------------------� --� --� --I---I---I---I---I---I---
-----li -li-----------------II-- -- -- -- -- -- -- -- -----------------II---
--r--I-----------------I-- -- -- -- --+--+--r--r--r--r--r--r--r--r--I---
--+--I-------------------+--+--+--+--+--+--+--+--+--+--+-----------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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 10yr,24hrtype 11 storm Rainfall=4.87"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 9
Summary for Pond 1 P: SWCM 1
Inflow Area = 2.190 ac, 54.34% Impervious, Inflow Depth = 2.87" for 10yr,24hr type II storm event
Inflow = 11.45 cfs @ 11.96 hrs, Volume= 0.524 of
Outflow = 5.15 cfs @ 12.05 hrs, Volume= 0.524 af, Atten= 55%, Lag= 5.4 min
Primary = 5.15 cfs @ 12.05 hrs, Volume= 0.524 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Peak Elev= 814.68' @ 12.05 hrs Surf.Area= 3,357 sf Storage= 7,463 cf
Plug -Flow detention time= 59.9 min calculated for 0.524 of (100% of inflow)
Center -of -Mass det. time= 59.9 min ( 876.1 - 816.2 )
Volume Invert Avail.Storage Storage Description
#1 811.50' 10,448 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
811.50 1,344 0 0
815.50 3,880 10,448 10,448
Device Routing Invert Outlet Devices
#1 Primary 811.50' 2.000 in/hr Exfiltration over Surface area
#2 Primary 808.50' 15.0" Round 15-IN Culvert
L= 56.3' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 808.50' / 807.48' S= 0.0181 T Cc= 0.900
n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf
#3 Device 2 811.50' 3.0" Horiz. 3-IN C= 0.600 Limited to weir flow at low heads
#4 Device 2 813.25' 12.0" W x 12.0" H Vert. 12-in x 12-in orifice C= 0.600
#5 Device 2 814.75' 48.0" x 48.0" Horiz. 5-ft x 5-ft Box C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=5.14 cfs @ 12.05 hrs HW=814.67' (Free Discharge)
�1=Exfiltration (Exfiltration Controls 0.16 cfs)
__2=154N Culvert (Passes 4.98 cfs of 13.92 cfs potential flow)
�3=34N (Orifice Controls 0.42 cfs @ 8.57 fps)
4=12-in x 12-in orifice (Orifice Controls 4.56 cfs @ 4.56 fps)
5=5-ft x 5-ft Box ( Controls 0.00 cfs)

BMP-1-Sand Filter Type 1124-hr 10yr,24hrtype 11 storm Rainfall=4.87"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 10
Pond 1 P: SWCM 1
Hydrograph
1 L45 cfs
--1--1---1---1---1---1 ---1 -- 1---- 1---1---1---1---1---1---1---1---1---1 ---1 -- 1---- 1----'
I li I I I I I I I I I I I I I I I I I I I
--1 - - -1-111---- -- -- 1I -- 1I --1I - - ---- ----
II II - II --- II --- II - - I I I I I I I r�fCo�nr�A-r�e�=112.�1113� Il�a�--I�
i--II---II--II---II---II-- 'I-- 'I --'I --'I -- I, -- I, --I,--II---I---l---I---I---I-�_-��II'I--Q'I--'Iw
811
-----I--____----Y--Y--+--+--Y--Y--Y--I---P Typ-� _ I -YI-9 1 Vol --I
--- ------II-- ----+--+-- -- --------- rg111e 7
Aolcf
--1---1----1---1---1---1--_I__�__1__1__1__�__I
0--1---L-1--- 1--- I--I--I--I----I--I--I--1--- I-------------- --I--I -- -----I
5.15 cfs
--------------- j-- j-- + -- + -- j -- j --j------------------- j-- + -- + -- j -- j --_
--I_--I_-------I--
T--T--+--+--T--T--T--I_--I_--I---I---I---I--T--T--T--T--T--I
-----I----------+--+--+--+--+--+--+-------------------+--+--+--+--+--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)
— Inflow
Primary

BMP-1-Sand Filter Type 1124-hr 10yr,24hrtype 11 storm Rainfall=4.87"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 11
Elevation Primary
(feet)
(Cfs)
811.50
0.00
811.52
0.07
811.54
0.08
811.56
0.10
811.58
0.12
811.60
0.14
811.62
0.15
811.64
0.15
811.66
0.16
811.68
0.17
811.70
0.17
811.72
0.18
811.74
0.19
811.76
0.19
811.78
0.20
811.80
0.20
811.82
0.21
811.84
0.21
811.86
0.21
811.88
0.22
811.90
0.22
811.92
0.23
811.94
0.23
811.96
0.24
811.98
0.24
812.00
0.24
812.02
0.25
812.04
0.25
812.06
0.26
812.08
0.26
812.10
0.26
812.12
0.27
812.14
0.27
812.16
0.27
812.18
0.28
812.20
0.28
812.22
0.28
812.24
0.29
812.26
0.29
812.28
0.29
812.30
0.30
812.32
0.30
812.34
0.30
812.36
0.31
812.38
0.31
812.40
0.31
812.42
0.32
812.44
0.32
812.46
0.32
812.48
0.32
812.50
0.33
812.52
0.33
812.54
0.33
Stage -Discharge for Pond 1 P: SWCM 1
Elevation Primary
(feet)
(Cfs)
812.56
0.34
812.58
0.34
812.60
0.34
812.62
0.35
812.64
0.35
812.66
0.35
812.68
0.35
812.70
0.36
812.72
0.36
812.74
0.36
812.76
0.36
812.78
0.37
812.80
0.37
812.82
0.37
812.84
0.38
812.86
0.38
812.88
0.38
812.90
0.38
812.92
0.39
812.94
0.39
812.96
0.39
812.98
0.39
813.00
0.40
813.02
0.40
813.04
0.40
813.06
0.40
813.08
0.41
813.10
0.41
813.12
0.41
813.14
0.41
813.16
0.42
813.18
0.42
813.20
0.42
813.22
0.42
813.24
0.43
813.26
0.43
813.28
0.45
813.30
0.47
813.32
0.49
813.34
0.52
813.36
0.56
813.38
0.59
813.40
0.63
813.42
0.67
813.44
0.71
813.46
0.76
813.48
0.81
813.50
0.86
813.52
0.91
813.54
0.96
813.56
1.02
813.58
1.07
813.60
1.13
Elevation Primary
(feet)
(Cfs)
813.62
1.19
813.64
1.25
813.66
1.32
813.68
1.38
813.70
1.45
813.72
1.51
813.74
1.58
813.76
1.65
813.78
1.72
813.80
1.80
813.82
1.87
813.84
1.95
813.86
2.02
813.88
2.10
813.90
2.18
813.92
2.26
813.94
2.34
813.96
2.43
813.98
2.51
814.00
2.59
814.02
2.68
814.04
2.77
814.06
2.86
814.08
2.94
814.10
3.04
814.12
3.13
814.14
3.22
814.16
3.31
814.18
3.41
814.20
3.50
814.22
3.60
814.24
3.70
814.26
3.79
814.28
3.88
814.30
3.96
814.32
4.04
814.34
4.11
814.36
4.18
814.38
4.25
814.40
4.32
814.42
4.39
814.44
4.45
814.46
4.52
814.48
4.58
814.50
4.64
814.52
4.71
814.54
4.77
814.56
4.82
814.58
4.88
814.60
4.94
814.62
5.00
814.64
5.05
814.66
5.11
Elevation Primary
(feet)
(Cfs)
814.68
5.16
814.70
5.21
814.72
5.27
814.74
5.32
814.76
5.42
814.78
5.69
814.80
6.06
814.82
6.49
814.84
6.99
814.86
7.53
814.88
8.12
814.90
8.76
814.92
9.43
814.94
10.15
814.96
10.90
814.98
11.68
815.00
12.49
815.02
13.34
815.04
14.22
815.06
14.56
815.08
14.59
815.10
14.61
815.12
14.64
815.14
14.66
815.16
14.69
815.18
14.71
815.20
14.73
815.22
14.76
815.24
14.78
815.26
14.81
815.28
14.83
815.30
14.86
815.32
14.88
815.34
14.91
815.36
14.93
815.38
14.95
815.40
14.98
815.42
15.00
815.44
15.03
815.46
15.05
815.48
15.07
815.50
15.10

BMP-1-Sand Filter Type 1124-hr 10yr,24hrtype 11 storm Rainfall=4.87"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 12
Stage -Area -Storage for Pond 1 P: SWCM 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
811.50
1,344
0
811.55
1,376
68
811.60
1,407
138
811.65
1,439
209
811.70
1,471
281
811.75
1,503
356
811.80
1,534
432
811.85
1,566
509
811.90
1,598
588
811.95
1,629
669
812.00
1,661
751
812.05
1,693
835
812.10
1,724
921
812.15
1,756
1,008
812.20
1,788
1,096
812.25
1,820
1,186
812.30
1,851
1,278
812.35
1,883
1,371
812.40
1,915
1,466
812.45
1,946
1,563
812.50
1,978
1,661
812.55
2,010
1,761
812.60
2,041
1,862
812.65
2,073
1,965
812.70
2,105
2,069
812.75
2,137
2,175
812.80
2,168
2,283
812.85
2,200
2,392
812.90
2,232
2,503
812.95
2,263
2,615
813.00
2,295
2,729
813.05
2,327
2,845
813.10
2,358
2,962
813.15
2,390
3,081
813.20
2,422
3,201
813.25
2,454
3,323
813.30
2,485
3,446
813.35
2,517
3,571
813.40
2,549
3,698
813.45
2,580
3,826
813.50
2,612
3,956
813.55
2,644
4,087
813.60
2,675
4,220
813.65
2,707
4,355
813.70
2,739
4,491
813.75
2,771
4,629
813.80
2,802
4,768
813.85
2,834
4,909
813.90
2,866
5,052
813.95
2,897
5,196
814.00
2,929
5,341
814.05
2,961
5,488
814.10
2,992
5,637
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
814.15
3,024
5,788
814.20
3,056
5,940
814.25
3,088
6,093
814.30
3,119
6,248
814.35
3,151
6,405
814.40
3,183
6,564
814.45
3,214
6,723
814.50
3,246
6,885
814.55
3,278
7,048
814.60
3,309
7,213
814.65
3,341
7,379
814.70
3,373
7,547
814.75
3,405
7,716
814.80
3,436
7,887
814.85
3,468
8,060
814.90
3,500
8,234
814.95
3,531
8,410
815.00
3,563
8,587
815.05
3,595
8,766
815.10
3,626
8,947
815.15
3,658
9,129
815.20
3,690
9,313
815.25
3,722
9,498
815.30
3,753
9,685
815.35
3,785
9,873
815.40
3,817
10,063
815.45
3,848
10,255
815.50
3,880
10,448

BMP-1-Sand Filter Type 1124-hr 25yr,24hrtype 11 storm Rainfall=5.78"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 13
Summary for Subcatchment 1 post: BMP-1 POST
Runoff = 14.53 cfs @ 11.96 hrs, Volume= 0.672 af, Depth= 3.68"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 25yr,24hr type II storm Rainfall=5.78"
Area (ac) CN Description
1.190
98 Paved parking, HSG B
1.000
61 >75% Grass cover, Good, HSG B
2.190
81 Weighted Average
1.000
45.66% Pervious Area
1.190
54.34% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 post: BMP-1 POST
Hydrograph
14.53ds ---------+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--I---
------- ------------------'I- '- '- '- '-'------------------TY�Setl�4;hr-
r 7 Z�yr,rtyp4 it storm Ramfall-5.78.. _
- -'- - - - - 'R- Ru{n�oVf# Area=2.tWal c -
--Y--Y--+--Y--,"(Yff'IY-oJ'lum_e-0672af-
- Runoff De'Ipthy3.68"
Tic=5,0 min
--r- -r-r----------------+--+--+--+--t--t--+--r--r--1-1r r--r 'bN=81
--r--i-----------------i-- -----------7--7--+--+--+--r--r-----------i---
--r--r -r----------------7-----------7--7--+--+--+--r--r-----------i---
--r--r -r----------------7-----------7--7--+--+--+--r--r-----------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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 25yr,24hrtype 11 storm Rainfall=5.78"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 14
Summary for Pond 1 P: SWCM 1
Inflow Area = 2.190 ac, 54.34% Impervious, Inflow Depth = 3.68" for 25yr,24hr type II storm event
Inflow = 14.53 cfs @ 11.96 hrs, Volume= 0.672 of
Outflow = 11.19 cfs @ 12.01 hrs, Volume= 0.672 af, Atten= 23%, Lag= 3.2 min
Primary = 11.19 cfs @ 12.01 hrs, Volume= 0.672 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Peak Elev= 814.97' @ 12.01 hrs Surf.Area= 3,543 sf Storage= 8,473 cf
Plug -Flow detention time= 56.4 min calculated for 0.672 of (100% of inflow)
Center -of -Mass det. time= 56.4 min ( 865.5 - 809.1 )
Volume Invert Avail.Storage Storage Description
#1 811.50' 10,448 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
811.50 1,344 0 0
815.50 3,880 10,448 10,448
Device Routing Invert Outlet Devices
#1 Primary 811.50' 2.000 in/hr Exfiltration over Surface area
#2 Primary 808.50' 15.0" Round 15-IN Culvert
L= 56.3' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 808.50' / 807.48' S= 0.0181 T Cc= 0.900
n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf
#3 Device 2 811.50' 3.0" Horiz. 3-IN C= 0.600 Limited to weir flow at low heads
#4 Device 2 813.25' 12.0" W x 12.0" H Vert. 12-in x 12-in orifice C= 0.600
#5 Device 2 814.75' 48.0" x 48.0" Horiz. 5-ft x 5-ft Box C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=11.03 cfs @ 12.01 hrs HW=814.96' (Free Discharge)
�1=Exfiltration (Exfiltration Controls 0.16 cfs)
__2=154N Culvert (Passes 10.86 cfs of 14.28 cfs potential flow)
�3=34N (Orifice Controls 0.44 cfs @ 8.96 fps)
4=12-in x 12-in orifice (Orifice Controls 5.27 cfs @ 5.27 fps)
5=5-ft x 5-ft Box (Weir Controls 5.16 cfs @ 1.51 fps)

BMP-1-Sand Filter Type 1124-hr 25yr,24hrtype 11 storm Rainfall=5.78"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 15
Pond 1 P: SWCM 1
Hydrograph
--il 14i53cfs ------+--+--+--+--+--+--+-------------------+--+--+--+--+--
rnfCow Area-"2.��19G4c__
--r--r -
--------r--r--r--r--r--r--r--r--rp-(
-,------I---I--r--r--r--r--r--
--r--r ---------r--r--r--r--r--r--r--r--r-------------r--r--r--r--r--
-- $toroigez�& 47 cf -
-- -- -- -- -- --------------------- -- -- -- -- --
--'---'--------'-- ----1--1--L--L-------------------'----1--1--L--L--
--r--r -
r-------r--r--r--r--r--r--r--r--r--r--r-------r--r--r--r--r
--
--r--r -r-------r--r--r--r--r--r--r--r--r-------------r--r--r--r--r
-
-
-----�- -------------1--1--L--L-----------------------L--L--L--L--
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)
— Inflow
Primary

BMP-1-Sand Filter Type 1124-hr 25yr,24hrtype 11 storm Rainfall=5.78"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 16
Elevation Primary
(feet)
(Cfs)
811.50
0.00
811.52
0.07
811.54
0.08
811.56
0.10
811.58
0.12
811.60
0.14
811.62
0.15
811.64
0.15
811.66
0.16
811.68
0.17
811.70
0.17
811.72
0.18
811.74
0.19
811.76
0.19
811.78
0.20
811.80
0.20
811.82
0.21
811.84
0.21
811.86
0.21
811.88
0.22
811.90
0.22
811.92
0.23
811.94
0.23
811.96
0.24
811.98
0.24
812.00
0.24
812.02
0.25
812.04
0.25
812.06
0.26
812.08
0.26
812.10
0.26
812.12
0.27
812.14
0.27
812.16
0.27
812.18
0.28
812.20
0.28
812.22
0.28
812.24
0.29
812.26
0.29
812.28
0.29
812.30
0.30
812.32
0.30
812.34
0.30
812.36
0.31
812.38
0.31
812.40
0.31
812.42
0.32
812.44
0.32
812.46
0.32
812.48
0.32
812.50
0.33
812.52
0.33
812.54
0.33
Stage -Discharge for Pond 1 P: SWCM 1
Elevation Primary
(feet)
(Cfs)
812.56
0.34
812.58
0.34
812.60
0.34
812.62
0.35
812.64
0.35
812.66
0.35
812.68
0.35
812.70
0.36
812.72
0.36
812.74
0.36
812.76
0.36
812.78
0.37
812.80
0.37
812.82
0.37
812.84
0.38
812.86
0.38
812.88
0.38
812.90
0.38
812.92
0.39
812.94
0.39
812.96
0.39
812.98
0.39
813.00
0.40
813.02
0.40
813.04
0.40
813.06
0.40
813.08
0.41
813.10
0.41
813.12
0.41
813.14
0.41
813.16
0.42
813.18
0.42
813.20
0.42
813.22
0.42
813.24
0.43
813.26
0.43
813.28
0.45
813.30
0.47
813.32
0.49
813.34
0.52
813.36
0.56
813.38
0.59
813.40
0.63
813.42
0.67
813.44
0.71
813.46
0.76
813.48
0.81
813.50
0.86
813.52
0.91
813.54
0.96
813.56
1.02
813.58
1.07
813.60
1.13
Elevation Primary
(feet)
(Cfs)
813.62
1.19
813.64
1.25
813.66
1.32
813.68
1.38
813.70
1.45
813.72
1.51
813.74
1.58
813.76
1.65
813.78
1.72
813.80
1.80
813.82
1.87
813.84
1.95
813.86
2.02
813.88
2.10
813.90
2.18
813.92
2.26
813.94
2.34
813.96
2.43
813.98
2.51
814.00
2.59
814.02
2.68
814.04
2.77
814.06
2.86
814.08
2.94
814.10
3.04
814.12
3.13
814.14
3.22
814.16
3.31
814.18
3.41
814.20
3.50
814.22
3.60
814.24
3.70
814.26
3.79
814.28
3.88
814.30
3.96
814.32
4.04
814.34
4.11
814.36
4.18
814.38
4.25
814.40
4.32
814.42
4.39
814.44
4.45
814.46
4.52
814.48
4.58
814.50
4.64
814.52
4.71
814.54
4.77
814.56
4.82
814.58
4.88
814.60
4.94
814.62
5.00
814.64
5.05
814.66
5.11
Elevation Primary
(feet)
(Cfs)
814.68
5.16
814.70
5.21
814.72
5.27
814.74
5.32
814.76
5.42
814.78
5.69
814.80
6.06
814.82
6.49
814.84
6.99
814.86
7.53
814.88
8.12
814.90
8.76
814.92
9.43
814.94
10.15
814.96
10.90
814.98
11.68
815.00
12.49
815.02
13.34
815.04
14.22
815.06
14.56
815.08
14.59
815.10
14.61
815.12
14.64
815.14
14.66
815.16
14.69
815.18
14.71
815.20
14.73
815.22
14.76
815.24
14.78
815.26
14.81
815.28
14.83
815.30
14.86
815.32
14.88
815.34
14.91
815.36
14.93
815.38
14.95
815.40
14.98
815.42
15.00
815.44
15.03
815.46
15.05
815.48
15.07
815.50
15.10

BMP-1-Sand Filter Type 1124-hr 25yr,24hrtype 11 storm Rainfall=5.78"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 17
Stage -Area -Storage for Pond 1 P: SWCM 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
811.50
1,344
0
811.55
1,376
68
811.60
1,407
138
811.65
1,439
209
811.70
1,471
281
811.75
1,503
356
811.80
1,534
432
811.85
1,566
509
811.90
1,598
588
811.95
1,629
669
812.00
1,661
751
812.05
1,693
835
812.10
1,724
921
812.15
1,756
1,008
812.20
1,788
1,096
812.25
1,820
1,186
812.30
1,851
1,278
812.35
1,883
1,371
812.40
1,915
1,466
812.45
1,946
1,563
812.50
1,978
1,661
812.55
2,010
1,761
812.60
2,041
1,862
812.65
2,073
1,965
812.70
2,105
2,069
812.75
2,137
2,175
812.80
2,168
2,283
812.85
2,200
2,392
812.90
2,232
2,503
812.95
2,263
2,615
813.00
2,295
2,729
813.05
2,327
2,845
813.10
2,358
2,962
813.15
2,390
3,081
813.20
2,422
3,201
813.25
2,454
3,323
813.30
2,485
3,446
813.35
2,517
3,571
813.40
2,549
3,698
813.45
2,580
3,826
813.50
2,612
3,956
813.55
2,644
4,087
813.60
2,675
4,220
813.65
2,707
4,355
813.70
2,739
4,491
813.75
2,771
4,629
813.80
2,802
4,768
813.85
2,834
4,909
813.90
2,866
5,052
813.95
2,897
5,196
814.00
2,929
5,341
814.05
2,961
5,488
814.10
2,992
5,637
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
814.15
3,024
5,788
814.20
3,056
5,940
814.25
3,088
6,093
814.30
3,119
6,248
814.35
3,151
6,405
814.40
3,183
6,564
814.45
3,214
6,723
814.50
3,246
6,885
814.55
3,278
7,048
814.60
3,309
7,213
814.65
3,341
7,379
814.70
3,373
7,547
814.75
3,405
7,716
814.80
3,436
7,887
814.85
3,468
8,060
814.90
3,500
8,234
814.95
3,531
8,410
815.00
3,563
8,587
815.05
3,595
8,766
815.10
3,626
8,947
815.15
3,658
9,129
815.20
3,690
9,313
815.25
3,722
9,498
815.30
3,753
9,685
815.35
3,785
9,873
815.40
3,817
10,063
815.45
3,848
10,255
815.50
3,880
10,448

BMP-1-Sand Filter Type 1124-hr 50yr,24hrtype 11 storm Rainfall=6.50"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 18
Summary for Subcatchment 1 post: BMP-1 POST
Runoff = 16.98 cfs @ 11.96 hrs, Volume= 0.792 af, Depth= 4.34"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 50yr,24hr type II storm Rainfall=6.50"
Area (ac) CN Description
1.190
98 Paved parking, HSG B
1.000
61 >75% Grass cover, Good, HSG B
2.190
81 Weighted Average
1.000
45.66% Pervious Area
1.190
54.34% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 post: BMP-1 POST
Hydrograph
8- --r 16.98ds
-1---1---1---1---1--r--r--r--r--+--+--r--r--r--r--r--r--r--r--1---
7 --+---
6 -- ---
------------------+--+--+--+--+--+--+--+--+--+--+--------------
------------------
--
--
--
--
-- -- -- -- --
-----Typell44;hr-
s
-----------------1--
--
--
--
-50yr,24hr-ty-It
storm 14 infa1l=613.50"-
a
- -
- ----'I--
I'I--
I'I--
I'I--I'I--I'I--------1
Runoff Area=2-tWac-
3--'1---'1-
-'1---'1---'1---'1---'1---'1---'1--'1--'1--'1--
-------'11 --Panlof#'1Voll'ume=0.792'1a#-
z - -' --'
-'--------------I--
--T--T--T--T--T--1-1
-T--TRu'pof
-De'lpthy4.34"-
1--r--I-
-I
--r--r--r--r--Y
Y--r--r--r--r--r--I
- c=5,L-rriin-
o--1r--I-
------------------y--
--
--
--t--t--t--t--t--r--r-------tN=84-
9 --+---
------------------+--+--+--+--+--+--+--+--+--+--+--------------
7- - ---'-
-'---'-----------------!--!--!--!--!--!
--! --! --'---'---'---'---'---'---
6- -'---'
-'-----------------'1--
--
--
--
-- -- -- --
5-
--1---1---1---1---
4- - F --I-
I
--
1
I
3 r--r
r--1---1---1---1---1--r--r--r--r--r--r--r--r--r--r--r--r--r--r--1---
2 --+---
------------------+--+--+--+--+--+--+--+--+--+--+--------------
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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 50yr,24hrtype 11 storm Rainfall=6.50"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 19
Summary for Pond 1 P: SWCM 1
Inflow Area = 2.190 ac, 54.34% Impervious, Inflow Depth = 4.34" for 50yr,24hr type II storm event
Inflow = 16.98 cfs @ 11.96 hrs, Volume= 0.792 of
Outflow = 14.59 cfs @ 11.99 hrs, Volume= 0.792 af, Atten= 14%, Lag= 2.0 min
Primary = 14.59 cfs @ 11.99 hrs, Volume= 0.792 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Peak Elev= 815.08' @ 12.00 hrs Surf.Area= 3,611 sf Storage= 8,860 cf
Plug -Flow detention time= 54.3 min calculated for 0.792 of (100% of inflow)
Center -of -Mass det. time= 54.3 min ( 858.7 - 804.4 )
Volume Invert Avail.Storage Storage Description
#1 811.50' 10,448 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
811.50 1,344 0 0
815.50 3,880 10,448 10,448
Device Routing Invert Outlet Devices
#1 Primary 811.50' 2.000 in/hr Exfiltration over Surface area
#2 Primary 808.50' 15.0" Round 15-IN Culvert
L= 56.3' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 808.50' / 807.48' S= 0.0181 T Cc= 0.900
n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf
#3 Device 2 811.50' 3.0" Horiz. 3-IN C= 0.600 Limited to weir flow at low heads
#4 Device 2 813.25' 12.0" W x 12.0" H Vert. 12-in x 12-in orifice C= 0.600
#5 Device 2 814.75' 48.0" x 48.0" Horiz. 5-ft x 5-ft Box C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=14.57 cfs @ 11.99 hrs HW=815.07' (Free Discharge)
�1=Exfiltration (Exfiltration Controls 0.17 cfs)
__2=154N Culvert (Inlet Controls 14.41 cfs @ 11.74 fps)
�3=34N (Passes < 0.45 cfs potential flow)
4=12-in x 12-in orifice (Passes < 5.50 cfs potential flow)
5=5-ft x 5-ft Box (Passes < 9.47 cfs potential flow)

BMP-1-Sand Filter Type 1124-hr 50yr,24hrtype 11 storm Rainfall=6.50"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 20
Pond 1 P: SWCM 1
Hydrograph
8- --i-------+--+--+--+--+--+-+-------------------+--+--+--+--+--i
7 --ii --il ---------+--+--+--+--+--+--+-------------------+--+--+--+--+--
6-----'--------'-- -- -- -- -- -- ---Fftov-r�ie=�.19f� a-
5 14.59cfs---------- -- -- -- -------------------'---- -- --'
4 -- ---------,-- -- -- -- --, --, --, -- --POD F0-$'I5.vO
3- -- - -i-------------- ----------------------------i---- ---- - - - - --
------r--Y--Y--
9-----i- ---------+--+--+--+--+--+--+-------------------+--+--+--+--+--
8-----'--------'-- ----1--1--L__L-------------------'----L--L--L--L--'
7-----'--------'-- ----1--1--L--L-------------------'----1--1--L--L--
6 --i --ii-------i-- -- -- -- -- -- -- --i --i-----------i-- -- -- -- -- --
5 --i --'i------------- -- -- -- --i --i --i-----------i- --- -- -- -- --
4 II
3 r--r--------r--r--Y--Y--r--r--r--r--r-------------r--Y--Y--r--r--i
2-----i----------+--+--+--+--+--+--+-------------------+--+--+--+--+--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)
— Inflow
Primary

BMP-1-Sand Filter Type 1124-hr 50yr,24hrtype 11 storm Rainfall=6.50"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 21
Elevation Primary
(feet)
(Cfs)
811.50
0.00
811.52
0.07
811.54
0.08
811.56
0.10
811.58
0.12
811.60
0.14
811.62
0.15
811.64
0.15
811.66
0.16
811.68
0.17
811.70
0.17
811.72
0.18
811.74
0.19
811.76
0.19
811.78
0.20
811.80
0.20
811.82
0.21
811.84
0.21
811.86
0.21
811.88
0.22
811.90
0.22
811.92
0.23
811.94
0.23
811.96
0.24
811.98
0.24
812.00
0.24
812.02
0.25
812.04
0.25
812.06
0.26
812.08
0.26
812.10
0.26
812.12
0.27
812.14
0.27
812.16
0.27
812.18
0.28
812.20
0.28
812.22
0.28
812.24
0.29
812.26
0.29
812.28
0.29
812.30
0.30
812.32
0.30
812.34
0.30
812.36
0.31
812.38
0.31
812.40
0.31
812.42
0.32
812.44
0.32
812.46
0.32
812.48
0.32
812.50
0.33
812.52
0.33
812.54
0.33
Stage -Discharge for Pond 1 P: SWCM 1
Elevation Primary
(feet)
(Cfs)
812.56
0.34
812.58
0.34
812.60
0.34
812.62
0.35
812.64
0.35
812.66
0.35
812.68
0.35
812.70
0.36
812.72
0.36
812.74
0.36
812.76
0.36
812.78
0.37
812.80
0.37
812.82
0.37
812.84
0.38
812.86
0.38
812.88
0.38
812.90
0.38
812.92
0.39
812.94
0.39
812.96
0.39
812.98
0.39
813.00
0.40
813.02
0.40
813.04
0.40
813.06
0.40
813.08
0.41
813.10
0.41
813.12
0.41
813.14
0.41
813.16
0.42
813.18
0.42
813.20
0.42
813.22
0.42
813.24
0.43
813.26
0.43
813.28
0.45
813.30
0.47
813.32
0.49
813.34
0.52
813.36
0.56
813.38
0.59
813.40
0.63
813.42
0.67
813.44
0.71
813.46
0.76
813.48
0.81
813.50
0.86
813.52
0.91
813.54
0.96
813.56
1.02
813.58
1.07
813.60
1.13
Elevation Primary
(feet)
(Cfs)
813.62
1.19
813.64
1.25
813.66
1.32
813.68
1.38
813.70
1.45
813.72
1.51
813.74
1.58
813.76
1.65
813.78
1.72
813.80
1.80
813.82
1.87
813.84
1.95
813.86
2.02
813.88
2.10
813.90
2.18
813.92
2.26
813.94
2.34
813.96
2.43
813.98
2.51
814.00
2.59
814.02
2.68
814.04
2.77
814.06
2.86
814.08
2.94
814.10
3.04
814.12
3.13
814.14
3.22
814.16
3.31
814.18
3.41
814.20
3.50
814.22
3.60
814.24
3.70
814.26
3.79
814.28
3.88
814.30
3.96
814.32
4.04
814.34
4.11
814.36
4.18
814.38
4.25
814.40
4.32
814.42
4.39
814.44
4.45
814.46
4.52
814.48
4.58
814.50
4.64
814.52
4.71
814.54
4.77
814.56
4.82
814.58
4.88
814.60
4.94
814.62
5.00
814.64
5.05
814.66
5.11
Elevation Primary
(feet)
(Cfs)
814.68
5.16
814.70
5.21
814.72
5.27
814.74
5.32
814.76
5.42
814.78
5.69
814.80
6.06
814.82
6.49
814.84
6.99
814.86
7.53
814.88
8.12
814.90
8.76
814.92
9.43
814.94
10.15
814.96
10.90
814.98
11.68
815.00
12.49
815.02
13.34
815.04
14.22
815.06
14.56
815.08
14.59
815.10
14.61
815.12
14.64
815.14
14.66
815.16
14.69
815.18
14.71
815.20
14.73
815.22
14.76
815.24
14.78
815.26
14.81
815.28
14.83
815.30
14.86
815.32
14.88
815.34
14.91
815.36
14.93
815.38
14.95
815.40
14.98
815.42
15.00
815.44
15.03
815.46
15.05
815.48
15.07
815.50
15.10

BMP-1-Sand Filter Type 1124-hr 50yr,24hrtype 11 storm Rainfall=6.50"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 22
Stage -Area -Storage for Pond 1 P: SWCM 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
811.50
1,344
0
811.55
1,376
68
811.60
1,407
138
811.65
1,439
209
811.70
1,471
281
811.75
1,503
356
811.80
1,534
432
811.85
1,566
509
811.90
1,598
588
811.95
1,629
669
812.00
1,661
751
812.05
1,693
835
812.10
1,724
921
812.15
1,756
1,008
812.20
1,788
1,096
812.25
1,820
1,186
812.30
1,851
1,278
812.35
1,883
1,371
812.40
1,915
1,466
812.45
1,946
1,563
812.50
1,978
1,661
812.55
2,010
1,761
812.60
2,041
1,862
812.65
2,073
1,965
812.70
2,105
2,069
812.75
2,137
2,175
812.80
2,168
2,283
812.85
2,200
2,392
812.90
2,232
2,503
812.95
2,263
2,615
813.00
2,295
2,729
813.05
2,327
2,845
813.10
2,358
2,962
813.15
2,390
3,081
813.20
2,422
3,201
813.25
2,454
3,323
813.30
2,485
3,446
813.35
2,517
3,571
813.40
2,549
3,698
813.45
2,580
3,826
813.50
2,612
3,956
813.55
2,644
4,087
813.60
2,675
4,220
813.65
2,707
4,355
813.70
2,739
4,491
813.75
2,771
4,629
813.80
2,802
4,768
813.85
2,834
4,909
813.90
2,866
5,052
813.95
2,897
5,196
814.00
2,929
5,341
814.05
2,961
5,488
814.10
2,992
5,637
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
814.15
3,024
5,788
814.20
3,056
5,940
814.25
3,088
6,093
814.30
3,119
6,248
814.35
3,151
6,405
814.40
3,183
6,564
814.45
3,214
6,723
814.50
3,246
6,885
814.55
3,278
7,048
814.60
3,309
7,213
814.65
3,341
7,379
814.70
3,373
7,547
814.75
3,405
7,716
814.80
3,436
7,887
814.85
3,468
8,060
814.90
3,500
8,234
814.95
3,531
8,410
815.00
3,563
8,587
815.05
3,595
8,766
815.10
3,626
8,947
815.15
3,658
9,129
815.20
3,690
9,313
815.25
3,722
9,498
815.30
3,753
9,685
815.35
3,785
9,873
815.40
3,817
10,063
815.45
3,848
10,255
815.50
3,880
10,448

BMP-1-Sand Filter Type 1124-hr 100yr,24hrtype 11 storm Rainfall=7.23"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 23
Summary for Subcatchment 1 post: BMP-1 POST
Runoff = 19.46 cfs @ 11.96 hrs, Volume= 0.916 af, Depth= 5.02"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Type II 24-hr 100yr,24hr type II storm Rainfall=7.23"
Area (ac) CN Description
1.190
98 Paved parking, HSG B
1.000
61 >75% Grass cover, Good, HSG B
2.190
81 Weighted Average
1.000
45.66% Pervious Area
1.190
54.34% Impervious Area
Tc Length Slope Velocity Capacity Description
iin) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1 post: BMP-1 POST
Hydrograph
19.46cfs---------------
--
--
--
--+--+--
--
--
-- ----------------
Type II 24Yhr
__r___
__________________
___________*100vri4hrrtype_II
storm Rainfall=7.23' _
-------------------
--
--
--
--'
-
----
-Runo##Area=2-' Wac-
--
--L--'-
-'---'---'---'---'---'--J--�--�--�--1--1--L--L--L--LRu,hof�Be',pthys.�2"-
-- ---
------------------
--
--
--
--
--
--
--
--
-- -- ----Tic=S;D-niin -
--r--r
--i --i
--r--r
--i ---
-r----------------r--r--r--r--r--r--r--r--r--r--r-----------81
-i-------------------------
-r--i---i---i---i---i--r--r--r--r--r--r--r--r--r--r--r--i---i---i---i---
-i--------
---------------------i
--r--r--r--i
--i
--i
bN=
-
--i-----------i---
--i --i--------- - -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)
— Runoff

BMP-1-Sand Filter Type 1124-hr 100yr,24hrtype 11 storm Rainfall=7.23"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 24
Summary for Pond 1 P: SWCM 1
Inflow Area = 2.190 ac, 54.34% Impervious, Inflow Depth = 5.02" for 100yr,24hr type II storm event
Inflow = 19.46 cfs @ 11.96 hrs, Volume= 0.916 of
Outflow = 14.84 cfs @ 12.01 hrs, Volume= 0.916 af, Atten= 24%, Lag= 3.1 min
Primary = 14.84 cfs @ 12.01 hrs, Volume= 0.916 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.02 hrs
Peak Elev= 815.29' @ 12.01 hrs Surf.Area= 3,744 sf Storage= 9,631 cf
Plug -Flow detention time= 52.6 min calculated for 0.916 of (100% of inflow)
Center -of -Mass det. time= 52.6 min ( 852.9 - 800.3 )
Volume Invert Avail.Storage Storage Description
#1 811.50' 10,448 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
811.50 1,344 0 0
815.50 3,880 10,448 10,448
Device Routing Invert Outlet Devices
#1 Primary 811.50' 2.000 in/hr Exfiltration over Surface area
#2 Primary 808.50' 15.0" Round 15-IN Culvert
L= 56.3' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 808.50' / 807.48' S= 0.0181 T Cc= 0.900
n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf
#3 Device 2 811.50' 3.0" Horiz. 3-IN C= 0.600 Limited to weir flow at low heads
#4 Device 2 813.25' 12.0" W x 12.0" H Vert. 12-in x 12-in orifice C= 0.600
#5 Device 2 814.75' 48.0" x 48.0" Horiz. 5-ft x 5-ft Box C= 0.600
Limited to weir flow at low heads
Primary OutFlow Max=14.83 cfs @ 12.01 hrs HW=815.28' (Free Discharge)
�1=Exfiltration (Exfiltration Controls 0.17 cfs)
__2=154N Culvert (Inlet Controls 14.66 cfs @ 11.94 fps)
�3=34N (Passes < 0.46 cfs potential flow)
4=12-in x 12-in orifice (Passes < 5.92 cfs potential flow)
5=5-ft x 5-ft Box (Passes < 20.08 cfs potential flow)

BMP-1-Sand Filter Type 1124-hr 100yr,24hrtype 11 storm Rainfall=7.23"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 25
Pond 1 P: SWCM 1
Hydrograph
--'---'---'---'---------+--+--L--L L--'-------------------1--1--L--L--'
19.46cfs ------+--+--+--+--+--+--+-----+-------------+--+--+--+--+--
� --+--+-i---i--+--+--+--+--+--+--+----ii---/I-i---i--+--+//�-+1--+GAF-+--++_--�
i-----I-__7__Y__Y__r__r__r_ .V-- ArV-12.19V,ac--I
--I --I --------- ----+--+-- -- -- -------------(------�_�I__I__I__I __ __I
14.84cfs---- ------ -- -- -- --li --' r OO`T� f�iYll—$A5■__ 1�__ili
--+--+--L--L-- $tOrOg'e-=*�6�1'cf -!
--+--+--+--+--+--+--+--------------I___I__�__+__+__+__�__�
--li --'i-------li------ -- -- -- --li --li --�i-----------li---- -- -- -- --�
-----I-----7--7--Y--Y-_7YYt__r__I
--I --- ---------------------I--I --I -
------------ -- -- -- --I--
I
i I I I I I I I I I I I I I I I I I I I I I I I I
I I I I I I 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)
— Inflow
Primary

BMP-1-Sand Filter Type 1124-hr 100yr,24hrtype 11 storm Rainfall=7.23"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 26
Elevation Primary
(feet)
(Cfs)
811.50
0.00
811.52
0.07
811.54
0.08
811.56
0.10
811.58
0.12
811.60
0.14
811.62
0.15
811.64
0.15
811.66
0.16
811.68
0.17
811.70
0.17
811.72
0.18
811.74
0.19
811.76
0.19
811.78
0.20
811.80
0.20
811.82
0.21
811.84
0.21
811.86
0.21
811.88
0.22
811.90
0.22
811.92
0.23
811.94
0.23
811.96
0.24
811.98
0.24
812.00
0.24
812.02
0.25
812.04
0.25
812.06
0.26
812.08
0.26
812.10
0.26
812.12
0.27
812.14
0.27
812.16
0.27
812.18
0.28
812.20
0.28
812.22
0.28
812.24
0.29
812.26
0.29
812.28
0.29
812.30
0.30
812.32
0.30
812.34
0.30
812.36
0.31
812.38
0.31
812.40
0.31
812.42
0.32
812.44
0.32
812.46
0.32
812.48
0.32
812.50
0.33
812.52
0.33
812.54
0.33
Stage -Discharge for Pond 1 P: SWCM 1
Elevation Primary
(feet)
(Cfs)
812.56
0.34
812.58
0.34
812.60
0.34
812.62
0.35
812.64
0.35
812.66
0.35
812.68
0.35
812.70
0.36
812.72
0.36
812.74
0.36
812.76
0.36
812.78
0.37
812.80
0.37
812.82
0.37
812.84
0.38
812.86
0.38
812.88
0.38
812.90
0.38
812.92
0.39
812.94
0.39
812.96
0.39
812.98
0.39
813.00
0.40
813.02
0.40
813.04
0.40
813.06
0.40
813.08
0.41
813.10
0.41
813.12
0.41
813.14
0.41
813.16
0.42
813.18
0.42
813.20
0.42
813.22
0.42
813.24
0.43
813.26
0.43
813.28
0.45
813.30
0.47
813.32
0.49
813.34
0.52
813.36
0.56
813.38
0.59
813.40
0.63
813.42
0.67
813.44
0.71
813.46
0.76
813.48
0.81
813.50
0.86
813.52
0.91
813.54
0.96
813.56
1.02
813.58
1.07
813.60
1.13
Elevation Primary
(feet)
(Cfs)
813.62
1.19
813.64
1.25
813.66
1.32
813.68
1.38
813.70
1.45
813.72
1.51
813.74
1.58
813.76
1.65
813.78
1.72
813.80
1.80
813.82
1.87
813.84
1.95
813.86
2.02
813.88
2.10
813.90
2.18
813.92
2.26
813.94
2.34
813.96
2.43
813.98
2.51
814.00
2.59
814.02
2.68
814.04
2.77
814.06
2.86
814.08
2.94
814.10
3.04
814.12
3.13
814.14
3.22
814.16
3.31
814.18
3.41
814.20
3.50
814.22
3.60
814.24
3.70
814.26
3.79
814.28
3.88
814.30
3.96
814.32
4.04
814.34
4.11
814.36
4.18
814.38
4.25
814.40
4.32
814.42
4.39
814.44
4.45
814.46
4.52
814.48
4.58
814.50
4.64
814.52
4.71
814.54
4.77
814.56
4.82
814.58
4.88
814.60
4.94
814.62
5.00
814.64
5.05
814.66
5.11
Elevation Primary
(feet)
(Cfs)
814.68
5.16
814.70
5.21
814.72
5.27
814.74
5.32
814.76
5.42
814.78
5.69
814.80
6.06
814.82
6.49
814.84
6.99
814.86
7.53
814.88
8.12
814.90
8.76
814.92
9.43
814.94
10.15
814.96
10.90
814.98
11.68
815.00
12.49
815.02
13.34
815.04
14.22
815.06
14.56
815.08
14.59
815.10
14.61
815.12
14.64
815.14
14.66
815.16
14.69
815.18
14.71
815.20
14.73
815.22
14.76
815.24
14.78
815.26
14.81
815.28
14.83
815.30
14.86
815.32
14.88
815.34
14.91
815.36
14.93
815.38
14.95
815.40
14.98
815.42
15.00
815.44
15.03
815.46
15.05
815.48
15.07
815.50
15.10

BMP-1-Sand Filter Type 1124-hr 100yr,24hrtype 11 storm Rainfall=7.23"
Prepared by Bluestone Land Management, PLLC Printed 9/10/2020
HydroCAD®10.00-16 s/n 09319 ©2015 HydroCAD Software Solutions LLC Page 27
Stage -Area -Storage for Pond 1 P: SWCM 1
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
811.50
1,344
0
811.55
1,376
68
811.60
1,407
138
811.65
1,439
209
811.70
1,471
281
811.75
1,503
356
811.80
1,534
432
811.85
1,566
509
811.90
1,598
588
811.95
1,629
669
812.00
1,661
751
812.05
1,693
835
812.10
1,724
921
812.15
1,756
1,008
812.20
1,788
1,096
812.25
1,820
1,186
812.30
1,851
1,278
812.35
1,883
1,371
812.40
1,915
1,466
812.45
1,946
1,563
812.50
1,978
1,661
812.55
2,010
1,761
812.60
2,041
1,862
812.65
2,073
1,965
812.70
2,105
2,069
812.75
2,137
2,175
812.80
2,168
2,283
812.85
2,200
2,392
812.90
2,232
2,503
812.95
2,263
2,615
813.00
2,295
2,729
813.05
2,327
2,845
813.10
2,358
2,962
813.15
2,390
3,081
813.20
2,422
3,201
813.25
2,454
3,323
813.30
2,485
3,446
813.35
2,517
3,571
813.40
2,549
3,698
813.45
2,580
3,826
813.50
2,612
3,956
813.55
2,644
4,087
813.60
2,675
4,220
813.65
2,707
4,355
813.70
2,739
4,491
813.75
2,771
4,629
813.80
2,802
4,768
813.85
2,834
4,909
813.90
2,866
5,052
813.95
2,897
5,196
814.00
2,929
5,341
814.05
2,961
5,488
814.10
2,992
5,637
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
814.15
3,024
5,788
814.20
3,056
5,940
814.25
3,088
6,093
814.30
3,119
6,248
814.35
3,151
6,405
814.40
3,183
6,564
814.45
3,214
6,723
814.50
3,246
6,885
814.55
3,278
7,048
814.60
3,309
7,213
814.65
3,341
7,379
814.70
3,373
7,547
814.75
3,405
7,716
814.80
3,436
7,887
814.85
3,468
8,060
814.90
3,500
8,234
814.95
3,531
8,410
815.00
3,563
8,587
815.05
3,595
8,766
815.10
3,626
8,947
815.15
3,658
9,129
815.20
3,690
9,313
815.25
3,722
9,498
815.30
3,753
9,685
815.35
3,785
9,873
815.40
3,817
10,063
815.45
3,848
10,255
815.50
3,880
10,448

MAPS
(see construction plans)
Bluestone Land Management, PLLC