SW4240401_Design Calculations_20240424

STORMWATER/DETENTION FACILITIES
(STORMTECH CHAMBER SYSTEM)
CALCULATION MANUAL
MARS HILL UNIVERSITY STUDENT
CENTER
(REVISED APRIL 23, 2024)
MARS HILL, NORTH CAROLINA
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Davis CivilSolutions,PA
April 2024
20166

NARRATIVE
STORM WATER/DETENTION
(STORMTECH CHAMBER SYSTEM)
MARS HILL UNIVERSITY STUDENT CENTER
Mars Hill,North Carolina
This project is located on the campus of Mars Hill University on the east side
of the existing Student Center on approximately 0.166 acres of land. The subject
project generally consists of the construction of a new paved loading dock, new
sidewalks, and new concrete additions to the existing quad area with grading,
installation of storm drainage utilities and paved or concrete surfaces. These
improvements are scattered throughout the student center area and are not
contiguous. As a result, a detention system has been designed in an existing grassed
area to accumulate the total additional change in surface areas added to the site in
the various locations, in an area that will allow the total changes from grassed
surfaces to impervious surfaces.
Storm water facilities include drop inlets, junction boxes, and connecting
piping. These facilities have been designed for the 25-year storm event. Storm
water detention is provided utilizing one (1) StormTech below-ground detention
facility for storage with outlet structures utilizing orifice and weirs capable of
controlling the post-construction runoff for the 1-year, 10-year, and 25-year storm
events by reducing the rate of runoff below pre-construction rates. Water quality is
provided utilizing the detention basin for storage to control the runoff from the 1-
inch storm event with a restricted orifice that will detain the runoff for an extended
period.
A summary of the pre-construction, post-construction, and detained flows
for the regulated design storms is attached.

DETENTION BASIN SUMMARY
STORMTECH CHAMBER SYSTEM
MARS HILL UNIVERSITY STUDENT CENTER
MARS HILL, NORTH CAROLINA
DETENTION SYSTEM
Area of Pre-Devel. Pre-Devel.Runoff to Post-Devel.Runoff Detention Release Size of Controlling Height Above Outlet
Rainfall Event Runoff to Detention Detention(cfs) to Detention(cfs) Rate(cfs) Orifice(in) Height of Weir(ft.) Inv.(ft.)
(Ac.)
(A) (B) (C) (D) (E) (F) (G)
v� 1 ti 0.166 0.00 0.24 Exfiltration,0.06 in/hr N/A 2.00 0.75
r t.:7Erly 0.166 0.00 0.57 0.00 8.00 3.00 1.73
' I:�ff 0.166 0.18 1.02 0.08 8.00 3.00 2.15
Y '' 0.166 0.30 1.22 0.36 8.00 3.00 2.34*
* DOES NOT OVERTOP SYSTEM
PROJECT#20166

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 1S: Runoff
Mars Hill University Student Center, 1-in Rainfall, (Post-Construction)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.238 cfs @ 11.90 hrs, Volume= 477 cf, Depth= 0.79"
Routed to Pond 1 P : StormTech Detention
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Type II 24-hr Rainfall=1.00"
Area (ac) CN Description
* 0.166 98 Pavements, Sidewalks, Roofs
0.166 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.3 75 0.0200 0.93 Lag/CN Method,
Subcatchment 1S: Runoff
Hydrograph
I I 1 1 I 1
; ; 1 7 T T r r '1 l T r r r -I' '1 I r r
0.26- ' T •Runoff
i 1 1 I I I I I I I
' , 10.23Bce I I I I I I I I 1 t
:::
-- I I I II
---------- ' ' ' RainfaII=1:00'1- -
I
0.2- I I II I I i I I 1 I III
L L J J i i L L Runoff-Area=0-.-1-66-ad--
0.18- I 1 I I I I I I I I I I I I I I I
016- ; ; Runo,ff;Vo,Iume;4;77 'Pt
wJ_ _1 L J J 1 1 L L J J 1 1 ..1.. II_ IJ1 1... -.L L. __ _
0.14_ - i ;Runoff IlDlepth=0.79"
° 0.12- LIL
:i:1I::z:I:Ii !Flow Length-77'5',
- - ; rI r I I I I I t I I
0.1- -r- ---- - r - - ------ Ir 'T Slo e=0.0001'/
I I I , , i I I I i c I
008-- ,-- ---7-- - -r-r-r----- -7- -r-r-r------- - trr-1r-r--Tr1 .3-min
- -
0.06- : : I I I I I I I I I I I I i I
- I , r r 'I 1 r T r r , / r r r r -1 1 4 CN=98
0.047 : : I I I I I I : I
II 1 � I I 1 � 1 � � I I
-----"I
- -r r r 1 1 Ti r r 1 1 T r r r 1 T I T r l
0 02 I I I I I I I I I I I I
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72
Time (hours)

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 2
Hydrograph for Subcatchment 1S: Runoff
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.000 52.00 1.00 0.79 0.000
1.00 0.01 0.00 0.000 53.00 1.00 0.79 0.000
2.00 0.02 0.00 0.000 54.00 1.00 0.79 0.000
3.00 0.03 0.00 0.000 55.00 1.00 0.79 0.000
4.00 0.05 0.00 0.000 56.00 1.00 0.79 0.000
5.00 0.06 0.00 0.000 57.00 1.00 0.79 0.000
6.00 0.08 0.01 0.001 58.00 1.00 0.79 0.000
7.00 0.10 0.01 0.001 59.00 1.00 0.79 0.000
8.00 0.12 0.02 0.002 60.00 1.00 0.79 0.000
9.00 0.15 0.04 0.003 61.00 1.00 0.79 0.000
10.00 0.18 0.06 0.004 62.00 1.00 0.79 0.000
11.00 0.24 0.09 0.009 63.00 1.00 0.79 0.000
12.00 0.66 0.47 0.081 64.00 1.00 0.79 0.000
13.00 0.77 0.57 0.010 65.00 1.00 0.79 0.000
14.00 0.82 0.62 0.006 66.00 1.00 0.79 0.000
15.00 0.85 0.65 0.005 67.00 1.00 0.79 0.000
16.00 0.88 0.68 0.004 68.00 1.00 0.79 0.000
17.00 0.90 0.70 0.003 69.00 1.00 0.79 0.000
18.00 0.92 0.71 0.003 70.00 1.00 0.79 0.000
19.00 0.94 0.73 0.003 71.00 1.00 0.79 0.000
20.00 0.95 0.74 0.002 72.00 1.00 0.79 0.000
21.00 0.96 0.76 0.002
22.00 0.98 0.77 0.002
23.00 0.99 0.78 0.002
24.00 1.00 0.79 0.002
25.00 1.00 0.79 0.000
26.00 1.00 0.79 0.000
27.00 1.00 0.79 0.000
28.00 1.00 0.79 0.000
29.00 1.00 0.79 0.000
30.00 1.00 0.79 0.000
31.00 1.00 0.79 0.000
32.00 1.00 0.79 0.000
33.00 1.00 0.79 0.000
34.00 1.00 0.79 0.000
35.00 1.00 0.79 0.000
36.00 1.00 0.79 0.000
37.00 1.00 0.79 0.000
38.00 1.00 0.79 0.000
39.00 1.00 0.79 0.000
40.00 1.00 0.79 0.000
41.00 1.00 0.79 0.000
42.00 1.00 0.79 0.000
43.00 1.00 0.79 0.000
44.00 1.00 0.79 0.000
45.00 1.00 0.79 0.000
46.00 1.00 0.79 0.000
47.00 1.00 0.79 0.000
48.00 1.00 0.79 0.000
49.00 1.00 0.79 0.000
50.00 1.00 0.79 0.000
51.00 1.00 0.79 0.000

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b sln 03655 ©2023 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: StormTech Detention
Detention Facility
Inflow Area = 7,231 sf,100.00% Impervious, Inflow Depth = 0.79"
Inflow = 0.238 cfs @ 11.90 hrs, Volume= 477 cf
Outflow = 0.004 cfs @ 11.55 hrs, Volume= 477 cf, Atten= 98%, Lag= 0.0 min
Discarded = 0.004 cfs @ 11.55 hrs, Volume= 477 cf
Primary = 0.000 cfs @ 0.00 hrs, Volume= 0 cf
Routed to nonexistent node 1 R
Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.05 hrs
Peak Elev= 0.31' @ 16.08 hrs Surf.Area= 2,650 sf Storage= 324 cf
Plug-Flow detention time= 899.2 min calculated for 477 cf(100% of inflow)
Center-of-Mass det. time= 899.1 min ( 1,679.4 - 780.2 )
Volume Invert Avail.Storage Storage Description
#1A 0.00' 5,079 cf 77.08'W x 34.38'L x 5.50'H Field A
14,576 cf Overall - 1,878 cf Embedded = 12,697 cf x 40.0% Voids
#2A 0.75' 1,878 cf ADS_StormTech MC-3500 d +Cap x 16 Inside#1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
16 Chambers in 4 Rows
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
6,957 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device Routing Invert Outlet Devices
#1 Primary 0.75' 18.00"Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#2 Device 1 2.00' 8.00" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#3 Device 1 3.00' 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
0.5' Crest Height
#4 Discarded 0.00' 0.060 in/hr Exfiltration over Surface area Phase-In= 0.01'
Discarded OutFlow Max=0.004 cfs @ 11.55 hrs HW=0.06' (Free Discharge)
t-4=Exfiltration (Exfiltration Controls 0.004 cfs)
Primary OutFlow Max=0.000 cfs @ 0.00 hrs HW=0.00' (Free Discharge)
t-1=Orifice/Grate ( Controls 0.000 cfs)
.E2=Orifice/Grate ( Controls 0.000 cfs)
3=Sharp-Crested Rectangular Weir ( Controls 0.000 cfs)

Mars Hill University Student Center, 1-in Rainfall Detention (P Type 1124-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 4
Pond 1 P: StormTech Detention - Chamber Wizard Field A
Chamber Model =ADS_StormTech MC-3500 d +Cap (ADS StormTech®MC-3500 d rev 03/14 with Cap
volume)
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
77.0" Wide + 9.0" Spacing = 86.0" C-C Row Spacing
4 Chambers/Row x 7.17' Long +1.85' Cap Length x 2 = 32.38' Row Length +12.0" End Stone x 2 = 34.38'
Base Length
4 Rows x 77.0" Wide + 9.0" Spacing x 3 + 295.0" Side Stone x 2 = 77.08' Base Width
9.0" Stone Base +45.0" Chamber Height + 12.0" Stone Cover = 5.50' Field Height
16 Chambers x 110.0 cf + 14.9 cf Cap Volume x 2 x 4 Rows = 1,878.4 cf Chamber Storage
14,575.7 cf Field - 1,878.4 cf Chambers = 12,697.3 cf Stone x 40.0%Voids = 5,078.9 cf Stone Storage
Chamber Storage + Stone Storage = 6,957.3 cf = 0.160 of
Overall Storage Efficiency = 47.7%
Overall System Size = 34.38' x 77.08' x 5.50'
16 Chambers
539.8 cy Field
470.3 cy Stone
ate.

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 5
Pond 1 P: StormTech Detention
Hydrograph
II I I I I I 1 1 I I I IIIIIIIIIIIIIIII
I 1 1 1 I II I I I I I I 1 1 I I 1 I I I I I I I I 1 I I
1 1 1 1 1 I 1 I 1 I 1 I I 1 I 1 I I I I I I I I I I 1 I I ■Inflow
--4
1-Iti•m -{1 -11---{I-II---{-II----1I-I1,---{I-I--II-4.1-I1--II-{I-IF'-I 4 I. i-I-
I -II-i- ❑Outflow
r T' -'r Ir T' 'r �_' - Inflow-Area=7I231,0,- Discarded
ry
0.26' 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
- ' 1 1 1 1 I 1 1 1 1 1 1 1 Peak IElev j 0.31'i
0.24' I 1 1 I I 1 I 1 1 1 1 1
---1-r-- --r-r--1-r--r-r--r-r--r-r--1-r-- ,-r-1-7-r -I-1-r-I- T
0.22 1 ' I ' ' ' 1 Storag.e=324'-cf--
1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0.2- I I I I I I I 1 I I I I I 1 I I I I I I I I
-t-r
0.18- I I I 1 1 1 I 1 I I I 1 1 1 I I 1 I I 1 I
I I I I I I I I I I I 1 1 11 11 I I
i I I I I I I I I 1 I I I I I 1 I 1 I I I 1
0.16- 1 I I 1 I t I I I I I I I I 1 1 I I 1 I 1
v1 I I I 11 1 I I I I I I I I I I I I I I
0.14 1 I 1 I I I I I I I I I I I I I 1 1 I I I
3 - 11 1 1 1 I I I 1 1 I I I I I I 11 11 I
O 0.12' I I I 1 1 I 1 I I I I I I I I I I I 1 I I
LT __1_L__
I I I I 1 I I I I I I I I I I I 1 I I I I
0.17 I I 1 I 1 I I I 1 1 1 I 1 1 I I 1 I 11 I
' r
0.08- 1 I I 1 1 I I I I I I I I 1 I I I I I I I
• ,'� '/. 1- I I
,', , I I I I I I I I I I I I I I I I I I 1
0.06- 1 1 I I I 1 1 1 1 1 I I I I I 1 1 1 1 1 1
0.04= . 0.004 cfs /
0.004 cfs 1
0 02-
1 0.000 cfs
0 2 4 6 8 10 12 1416 18 20 22 2426 28 30 32 3436 38 40 42 44 4648 50 52 54 56 58 60 62 64 6668 70 72
Time (hours)
Pond 1 P: StormTech Detention
Stage-Discharge
I 0 Total
-1 I- y1 i Discarded
®Primary
5:
d % //// Sharp Crested Rectangular Weirj
O
. H/ Orifice/Grate
w - `.
" -'
1- %/ i Orifice/Grate
j0/
/�/ Exfiltration /
0 2 4 6 8 10 12 14 16
Discharge (cfs)

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 6
Pond 1 P: StormTech Detention
Stage-Area-Storage
Surface/Horizontal/Wetted Area(scl-ft)
0 500 1,000 1,500 2,000 2,500 0 Surface`
O Storage I
/-- -, -i r 7 -r
5.
V,
4- �
9.
4 4 L -1 4 /% -1 I- 1 %/
m
0
w '
3- / : g c „ �(
O _J -IL 1 I i 7
W 2- /'
II
II
->/Y ---1- J JI
1- , ADS StormTech MC-3500 d+CBpj II
1 1 1 11
I I 1 I 11
Field A /
0 1,000 2,000 3,000 4,000 5,000 6,000
Storage(cubic-feet)

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 7
Hydrograph for Pond 1P: StormTech Detention
Time Inflow Storage Elevation Outflow Discarded Primary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.000 0 0.00 0.000 0.000 0.000
2.50 0.000 0 0.00 0.000 0.000 0.000
5.00 0.000 1 0.00 0.000 0.000 0.000
7.50 0.002 8 0.01 0.000 0.000 0.000
10.00 0.004 23 0.02 0.001 0.001 0.000
12.50 0.015 286 0.27 0.004 0.004 0.000
15.00 0.005 322 0.30 0.004 0.004 0.000
17.50 0.003 323 0.30 0.004 0.004 0.000
20.00 0.002 313 0.30 0.004 0.004 0.000
22.50 0.002 298 0.28 0.004 0.004 0.000
25.00 0.000 275 0.26 0.004 0.004 0.000
27.50 0.000 242 0.23 0.004 0.004 0.000
30.00 0.000 209 0.20 0.004 0.004 0.000
32.50 0.000 176 0.17 0.004 0.004 0.000
35.00 0.000 142 0.13 0.004 0.004 0.000
37.50 0.000 109 0.10 0.004 0.004 0.000
40.00 0.000 76 0.07 0.004 0.004 0.000
42.50 0.000 45 0.04 0.003 0.003 0.000
45.00 0.000 25 0.02 0.002 0.002 0.000
47.50 0.000 14 0.01 0.001 0.001 0.000
50.00 0.000 8 0.01 0.001 0.001 0.000
52.50 0.000 5 0.00 0.000 0.000 0.000
55.00 0.000 3 0.00 0.000 0.000 0.000
57.50 0.000 1 0.00 0.000 0.000 0.000
60.00 0.000 1 0.00 0.000 0.000 0.000
62.50 0.000 0 0.00 0.000 0.000 0.000
65.00 0.000 0 0.00 0.000 0.000 0.000
67.50 0.000 0 0.00 0.000 0.000 0.000
70.00 0.000 0 0.00 0.000 0.000 0.000

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 8
Stage-Discharge for Pond 1 P: StormTech Detention
Elevation Discharge Discarded Primary Elevation Discharge Discarded Primary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
0.00 0.000 0.000 0.000 5.20 16.371 0.004 16.367
0.10 0.004 0.004 0.000 5.30 16.590 0.004 16.587
0.20 0.004 0.004 0.000 5.40 16.807 0.004 16.803
0.30 0.004 0.004 0.000 5.50 17.021 0.004 17.018
0.40 0.004 0.004 0.000
0.50 0.004 0.004 0.000
0.60 0.004 0.004 0.000
0.70 0.004 0.004 0.000
0.80 0.004 0.004 0.000
0.90 0.004 0.004 0.000
1.00 0.004 0.004 0.000
1.10 0.004 0.004 0.000
1.20 0.004 0.004 0.000
1.30 0.004 0.004 0.000
1.40 0.004 0.004 0.000
1.50 0.004 0.004 0.000
1.60 0.004 0.004 0.000
1.70 0.004 0.004 0.000
1.80 0.004 0.004 0.000
1.90 0.004 0.004 0.000
2.00 0.004 0.004 0.000
2.10 0.039 0.004 0.035
2.20 0.138 0.004 0.134
2.30 0.288 0.004 0.284
2.40 0.475 0.004 0.471
2.50 0.680 0.004 0.676
2.60 0.876 0.004 0.873
2.70 1.021 0.004 1.018
2.80 1.152 0.004 1.148
2.90 1.269 0.004 1.265
3.00 1.376 0.004 1.372
3.10 1.897 0.004 1.893
3.20 2.783 0.004 2.780
3.30 3.929 0.004 3.925
3.40 5.300 0.004 5.296
3.50 6.880 0.004 6.876
3.60 8.658 0.004 8.654
3.70 10.627 0.004 10.623
3.80 12.783 0.004 12.779
3.90 13.185 0.004 13.182
4.00 13.457 0.004 13.454
4.10 13.724 0.004 13.720
4.20 13.985 0.004 13.981
4.30 14.242 0.004 14.238
4.40 14.494 0.004 14.490
4.50 14.741 0.004 14.738
4.60 14.985 0.004 14.981
4.70 15.225 0.004 15.221
4.80 15.461 0.004 15.457
4.90 15.693 0.004 15.689
5.00 15.922 0.004 15.918
5.10 16.148 0.004 16.144

Mars Hill University Student Center, 1-in Rainfall Detention (P Type II 24-hr Rainfall=1.00"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD®10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 9
Stage-Area-Storage for Pond I P: StormTech Detention
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
0.00 2,650 0 5.20 2,650 6,639
0.10 2,650 106 5.30 2,650 6,745
0.20 2,650 212 5.40 2,650 6,851
0.30 2,650 318 5.50 2,650 6,957
0.40 2,650 424
0.50 2,650 530
0.60 2,650 636
0.70 2,650 742
0.80 2,650 870
0.90 2,650 1,018
1.00 2,650 1,167
1.10 2,650 1,315
1.20 2,650 1,463
1.30 2,650 1,611
1.40 2,650 1,758
1.50 2,650 1,905
1.60 2,650 2,051
1.70 2,650 2,197
1.80 2,650 2,343
1.90 2,650 2,488
2.00 2,650 2,633
2.10 2,650 2,777
2.20 2,650 2,920
2.30 2,650 3,063
2.40 2,650 3,205
2.50 2,650 3,346
2.60 2,650 3,487
2.70 2,650 3,627
2.80 2,650 3,766
2.90 2,650 3,904
3.00 2,650 4,041
3.10 2,650 4,178
3.20 2,650 4,313
3.30 2,650 4,447
3.40 2,650 4,579
3.50 2,650 4,710
3.60 2,650 4,840
3.70 2,650 4,968
3.80 2,650 5,094
3.90 2,650 5,218
4.00 2,650 5,340
4.10 2,650 5,458
4.20 2,650 5,571
4.30 2,650 5,682
4.40 2,650 5,790
4.50 2,650 5,897
4.60 2,650 6,003
4.70 2,650 6,109
4.80 2,650 6,215
4.90 2,650 6,321
5.00 2,650 6,427
5.10 2,650 6,533

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type II 24-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 1 S: Runoff
Mars Hill University Student Center, 1-yr Storm Event (Post-Construction)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 0.57 cfs @ 11.90 hrs, Volume= 1,219 cf, Depth= 2.02"
Routed to Pond 1 P : StormTech Detention
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-50.00 hrs, dt= 0.05 hrs
Type II 24-hr Rainfall=2.25"
Area (ac) CN Description
* 0.166 98 Pavements, Sidewalks, Roofs
0.166 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.3 75 0.0200 0.93 Lag/CN Method,
Subcatchment 1S: Runoff
Hydrograph
1 I I I I I I I I 1 I I
! I I I I I I ! !
-
---J--L----J J. L 1 L _I L
I .1 1 I L J I 1 I L I a--IL • -
❑Runoff`
I 1 I 1 I
0.6 L0.57 cfs I 1 I 1 I I !
_____J__L____ -V __-L_J-_J__L____J__L-_L-J--1__L___- _-L__
Type 1124-h r
1 I I I I V
0.55- I I 1
0.5- : 1 ! Rainfall=,2.25"'
J L I _L L_..__.I.-_L__.I__ _I__1__L
0.45 Runoff Ar'eaI=0.166 ac
�----J--L----J. L 1 L J I I 1. . .. .I_.-1. .. l-- -l-- - --I-- -
0.4- " Runoff Volume=1 ,-219 df
• JLJ L 1 L J L
0.35- Runoff Depth=12.o2"
J
I r I I I I I
0.3 Flow Length=7 '- _
0.25- Slope;0.0200 '/'
0.2-
Tc=1 .3 -min
0.15-
-1 r CN198
0.1-
• I I
• I I
0.05- ' I I I
I I I
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
Time (hours)

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type II 24-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 2
Hydrograph for Subcatchment 1S: Runoff
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 26.00 2.25 2.02 0.00
0.50 0.01 0.00 0.00 26.50 2.25 2.02 0.00
1.00 0.02 0.00 0.00 27.00 2.25 2.02 0.00
1.50 0.04 0.00 0.00 27.50 2.25 2.02 0.00
2.00 0.05 0.00 0.00 28.00 2.25 2.02 0.00
2.50 0.06 0.00 0.00 28.50 2.25 2.02 0.00
3.00 0.08 0.01 0.00 29.00 2.25 2.02 0.00
3.50 0.09 0.01 0.00 29.50 2.25 2.02 0.00
4.00 0.11 0.02 0.00 30.00 2.25 2.02 0.00
4.50 0.12 0.02 0.00 30.50 2.25 2.02 0.00
5.00 0.14 0.03 0.00 31.00 2.25 2.02 0.00
5.50 0.16 0.04 0.00 31.50 2.25 2.02 0.00
6.00 0.18 0.06 0.00 32.00 2.25 2.02 0.00
6.50 0.20 0.07 0.00 32.50 2.25 2.02 0.00
7.00 0.22 0.09 0.01 33.00 2.25 2.02 0.00
7.50 0.25 0.10 0.01 33.50 2.25 2.02 0.00
8.00 0.27 0.12 0.01 34.00 2.25 2.02 0.00
8.50 0.30 0.14 0.01 34.50 2.25 2.02 0.00
9.00 0.33 0.17 0.01 35.00 2.25 2.02 0.00
9.50 0.37 0.20 0.01 35.50 2.25 2.02 0.00
10.00 0.41 0.24 0.01 36.00 2.25 2.02 0.00
10.50 0.46 0.28 0.02 36.50 2.25 2.02 0.00
11.00 0.53 0.34 0.02 37.00 2.25 2.02 0.00
11.50 0.64 0.44 0.04 37.50 2.25 2.02 0.00
12.00 1.49 1.27 0.19 38.00 2.25 2.02 0.00
12.50 1.65 1.43 0.03 38.50 2.25 2.02 0.00
13.00 1.74 1.51 0.02 39.00 2.25 2.02 0.00
13.50 1.80 1.57 0.02 39.50 2.25 2.02 0.00
14.00 1.84 1.62 0.01 40.00 2.25 2.02 0.00
14.50 1.88 1.66 0.01 40.50 2.25 2.02 0.00
15.00 1.92 1.70 0.01 41.00 2.25 2.02 0.00
15.50 1.95 1.73 0.01 41.50 2.25 2.02 0.00
16.00 1.98 1.75 0.01 42.00 2.25 2.02 0.00
16.50 2.01 1.78 0.01 42.50 2.25 2.02 0.00
17.00 2.03 1.80 0.01 43.00 2.25 2.02 0.00
17.50 2.05 1.83 0.01 43.50 2.25 2.02 0.00
18.00 2.07 1.85 0.01 44.00 2.25 2.02 0.00
18.50 2.09 1.87 0.01 44.50 2.25 2.02 0.00
19.00 2.11 1.88 0.01 45.00 2.25 2.02 0.00
19.50 2.13 1.90 0.01 45.50 2.25 2.02 0.00
20.00 2.14 1.92 0.00 46.00 2.25 2.02 0.00
20.50 2.16 1.93 0.00 46.50 2.25 2.02 0.00
21.00 2.17 1.94 0.00 47.00 2.25 2.02 0.00
21.50 2.18 1.96 0.00 47.50 2.25 2.02 0.00
22.00 2.20 1.97 0.00 48.00 2.25 2.02 0.00
22.50 2.21 1.98 0.00 48.50 2.25 2.02 0.00
23.00 2.22 2.00 0.00 49.00 2.25 2.02 0.00
23.50 2.24 2.01 0.00 49.50 2.25 2.02 0.00
24.00 2.25 2.02 0.00 50.00 2.25 2.02 0.00
24.50 2.25 2.02 0.00
25.00 2.25 2.02 0.00
25.50 2.25 2.02 0.00

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type II 24-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: StormTech Detention
Detention Facility
Inflow Area = 7,231 sf,100.00% Impervious, Inflow Depth = 2.02"
Inflow = 0.57 cfs @ 11.90 hrs, Volume= 1,219 cf
Outflow = 0.00 cfs @ 5.80 hrs, Volume= 235 cf, Atten= 100%, Lag= 0.0 min
Discarded = 0.00 cfs @ 5.80 hrs, Volume= 235 cf
Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routed to nonexistent node 1R
Routing by Stor-Ind method, Time Span= 0.00-50.00 hrs, dt= 0.05 hrs
Peak Elev= 1.73' @ 24.04 hrs Surf.Area= 1,029 sf Storage= 1,117 cf
Plug-Flow detention time= 1,102.9 min calculated for 235 cf (19% of inflow)
Center-of-Mass det. time= 872.7 min ( 1,629.0 - 756.4 )
Volume Invert Avail.Storage Storage Description
#1A 0.00' 1,511 cf 29.92'W x 34.38'L x 5.50'H Field A
5,657 cf Overall - 1,878 cf Embedded = 3,779 cf x 40.0% Voids
#2A 0.75' 1,878 cf ADS_StormTech MC-3500 d +Cap x 16 Inside#1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
16 Chambers in 4 Rows
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
3,390 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device Routing Invert Outlet Devices
#1 Primary 0.75' 18.00" Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#2 Device 1 2.00' 8.00" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#3 Device 1 3.00' 3.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
0.5' Crest Height
#4 Discarded 0.00' 0.060 in/hr Exfiltration over Surface area Phase-In= 0.01'
Discarded OutFlow Max=0.00 cfs @ 5.80 hrs HW=0.06' (Free Discharge)
t..4=Exfiltration (Exfiltration Controls 0.00 cfs)
Primary OutFlow Max=0.00 cfs © 0.00 hrs HW=0.00' (Free Discharge)
t-1=Orifice/Grate ( Controls 0.00 cfs)
- 2=Orifice/Grate ( Controls 0.00 cfs)
3=Sharp-Crestecl Rectangular Weir ( Controls 0.00 cfs)

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type 1124-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 4
Pond 1 P: StormTech Detention - Chamber Wizard Field A
Chamber Model =ADS_StormTech MC-3500 d +Cap (ADS StormTech®MC-3500 cl rev 03/14 with Cap
volume)
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
77.0" Wide + 9.0" Spacing = 86.0" C-C Row Spacing
4 Chambers/Row x 7.17' Long +1.85' Cap Length x 2 = 32.38' Row Length +12.0" End Stone x 2 = 34.38'
Base Length
4 Rows x 77.0" Wide + 9.0" Spacing x 3 + 12.0" Side Stone x 2 = 29.92' Base Width
9.0" Stone Base +45.0" Chamber Height + 12.0" Stone Cover = 5.50' Field Height
16 Chambers x 110.0 cf + 14.9 cf Cap Volume x 2 x 4 Rows = 1,878.4 cf Chamber Storage
5,656.9 cf Field - 1,878.4 cf Chambers = 3,778.5 cf Stone x 40.0% Voids = 1,511.4 cf Stone Storage
Chamber Storage + Stone Storage = 3,389.8 cf = 0.078 of
Overall Storage Efficiency = 59.9%
Overall System Size = 34.38' x 29.92' x 5.50'
16 Chambers
209.5 cy Field
139.9 cy Stone
E ,

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type II 24-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 5
Pond 1 P: StormTech Detention
Hydrograph
I I
1 I I I I I 1 I I I I I I I I 1
1
--YI--- r----Ir--I----tI ----Ir--t----t--I--r--t--I--t--I--Ir--I--I--It--II
--
I I 0.67C8
1 I I 1
I I
1 1 I I I I I 1 I I
I I I I I I
: Inflow Area=7,231 sf NInflow
❑Outflow w
Discard ed
❑Primary
,
•
" ' ' 'I
__1____L____L ____11 I I I 1 1 1 I
____L_J____1____L_ 1- 1- 1--L-_.--I--1-_,__
I 1 1
0.6= ,
, 1 1 1 1 1 1 1 Peak .Elea=1 .73'
0.55- , 1 1 1 iLiii.
_-__L. _ _, i
0.45- • • I I I I I I 1 I I I I I I
I I 1 I I 1 1 IIII
0.4-' I I I I I I I I 1 I I I I 1
W •
I I I I I I I I I I I I 1
I I I I I I 1 1 I 1 I I
V 0.357'' I I I I I 1 I I I I I I I I
„ '__1____L____ ____1_J__L_J____1_J__L_J____1_J__L_1____1
0.32' 1 I I 1 1 I I 1 I I I 1 1 1 I
o I I I I I I I I I I I I I 1
LT_ • '
0.257 I 1 I I 1 1 1 I I I 1 I I I
I I I I I I I I I I I I I I
1 I I I I I I I I I I I I I _
0.2- 1 1 I I I I I I I I I I I
, L_J____1_
0.15- I I I I I 1 I
I 1 1 ` I I i I I I I I 1 1
0.1- ��
• 0.00 cfs
0 05-L ' 0.00 crs I .:,,, f
I000cfs
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
Time (hours)
Pond 1 P: StormTech Detention
Stage-Discharge
I ❑Total
---,---- .. t i- - _- - _ - -- -1 ..--
_
■Discarded
• ®Primary
j ./
5
4. / �� �//- �'
I e -,Aglir' '/idillFrAirAIPP:"AdillY-41r- -4r
r -I:
Q .o,-'F - I
d A.. '"Sharp-Crested Rectangular Weir!
3
c 1 '
o
._ 'i 1
a
Orifice/Grate
w
1-,'";:A 4' /6.rptel I
.%,j Exfiltratfon
0 2 4 6 8 10 12 14 16
Discharge (cfs)

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type 1124-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 6
Pond 1 P: StormTech Detention
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 100 200 300 400 500 600 700 800 900 1,000 ❑Surface II
/ 1
/- 0 Storage
i I I I
1 1
y r r r -1r r T 1 j
/1 I
1
5- 1
I
I
4 10
I
L JL /__ J
O 1 L __�_///l _ _ JI I 1 J f/.fi
///// 1
1 //z/ !ADS StormTech MC-3500 d+Cap>) i P
i I I 1
----•--- 0 I I I
- ------lFi is — /
0 500 1,000 1,500 2,000 2,500 3,000
Storage(cubic-feet)

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type 11 24-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 7
Hydrograph for Pond 1 P: StormTech Detention
Time Inflow Storage Elevation Outflow Discarded Primary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 0.00 0.00 0.00 0.00
1.00 0.00 0 0.00 0.00 0.00 0.00
2.00 0.00 0 0.00 0.00 0.00 0.00
3.00 0.00 3 0.01 0.00 0.00 0.00
4.00 0.00 8 0.02 0.00 0.00 0.00
5.00 0.00 16 0.04 0.00 0.00 0.00
6.00 0.00 25 0.06 0.00 0.00 0.00
7.00 0.01 37 0.09 0.00 0.00 0.00
8.00 0.01 54 0.13 0.00 0.00 0.00
9.00 0.01 78 0.19 0.00 0.00 0.00
10.00 0.01 112 0.27 0.00 0.00 0.00
11.00 0.02 171 0.42 0.00 0.00 0.00
12.00 0.19 711 1.23 0.00 0.00 0.00
13.00 0.02 866 1.42 0.00 0.00 0.00
14.00 0.01 926 1.49 0.00 0.00 0.00
15.00 0.01 966 1.54 0.00 0.00 0.00
16.00 0.01 996 1.58 0.00 0.00 0.00
17.00 0.01 1,021 1.61 0.00 0.00 0.00
18.00 0.01 1,041 1.63 0.00 0.00 0.00
19.00 0.01 1,059 1.66 0.00 0.00 0.00
20.00 0.00 1,073 1.67 0.00 0.00 0.00
21.00 0.00 1,085 1.69 0.00 0.00 0.00
22.00 0.00 1,096 1.70 0.00 0.00 0.00
23.00 0.00 1,107 1.72 0.00 0.00 0.00
24.00 0.00 1,117 1.73 0.00 0.00 0.00
25.00 0.00 1,112 1.72 0.00 0.00 0.00
26.00 0.00 1,107 1.72 0.00 0.00 0.00
27.00 0.00 1,102 1.71 0.00 0.00 0.00
28.00 0.00 1,097 1.70 0.00 0.00 0.00
29.00 0.00 1,092 1.70 0.00 0.00 0.00
30.00 0.00 1,086 1.69 0.00 0.00 0.00
31.00 0.00 1,081 1.68 0.00 0.00 0.00
32.00 0.00 1,076 1.68 0.00 0.00 0.00
33.00 0.00 1,071 1.67 0.00 0.00 0.00
34.00 0.00 1,066 1.66 0.00 0.00 0.00
35.00 0.00 1,061 1.66 0.00 0.00 0.00
36.00 0.00 1,056 1.65 0.00 0.00 0.00
37.00 0.00 1,050 1.65 0.00 0.00 0.00
38.00 0.00 1,045 1.64 0.00 0.00 0.00
39.00 0.00 1,040 1.63 0.00 0.00 0.00
40.00 0.00 1,035 1.63 0.00 0.00 0.00
41.00 0.00 1,030 1.62 0.00 0.00 0.00
42.00 0.00 1,025 1.61 0.00 0.00 0.00
43.00 0.00 1,020 1.61 0.00 0.00 0.00
44.00 0.00 1,014 1.60 0.00 0.00 0.00
45.00 0.00 1,009 1.59 0.00 0.00 0.00
46.00 0.00 1,004 1.59 0.00 0.00 0.00
47.00 0.00 999 1.58 0.00 0.00 0.00
48.00 0.00 994 1.58 0.00 0.00 0.00
49.00 0.00 989 1.57 0.00 0.00 0.00
50.00 0.00 984 1.56 0.00 0.00 0.00

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type II 24-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 8
Stage-Discharge for Pond 1 P: StormTech Detention
Elevation Discharge Discarded Primary Elevation Discharge Discarded Primary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0.00 0.00 5.20 16.37 0.00 16.37
0.10 0.00 0.00 0.00 5.30 16.59 0.00 16.59
0.20 0.00 0.00 0.00 5.40 16.80 0.00 16.80
0.30 0.00 0.00 0.00 5.50 17.02 0.00 17.02
0.40 0.00 0.00 0.00
0.50 0.00 0.00 0.00
0.60 0.00 0.00 0.00
0.70 0.00 0.00 0.00
0.80 0.00 0.00 0.00
0.90 0.00 0.00 0.00
1.00 0.00 0.00 0.00
1.10 0.00 0.00 0.00
1.20 0.00 0.00 0.00
1.30 0.00 0.00 0.00
1.40 0.00 0.00 0.00
1.50 0.00 0.00 0.00
1.60 0.00 0.00 0.00
1.70 0.00 0.00 0.00
1.80 0.00 0.00 0.00
1.90 0.00 0.00 0.00
2.00 0.00 0.00 0.00
2.10 0.04 0.00 0.04
2.20 0.14 0.00 0.13
2.30 0.29 0.00 0.28
2.40 0.47 0.00 0.47
2.50 0.68 0.00 0.68
2.60 0.87 0.00 0.87
2.70 1.02 0.00 1.02
2.80 1.15 0.00 1.15
2.90 1.27 0.00 1.27
3.00 1.37 0.00 1.37
3.10 1.79 0.00 1.79
3.20 2.47 0.00 2.47
3.30 3.35 0.00 3.35
3.40 4.39 0.00 4.39
3.50 5.58 0.00 5.58
3.60 6.91 0.00 6.91
3.70 8.38 0.00 8.38
3.80 9.98 0.00 9.98
3.90 11.71 0.00 11.71
4.00 13.45 0.00 13.45
4.10 13.72 0.00 13.72
4.20 13.98 0.00 13.98
4.30 14.24 0.00 14.24
4.40 14.49 0.00 14.49
4.50 14.74 0.00 14.74
4.60 14.98 0.00 14.98
4.70 15.22 0.00 15.22
4.80 15.46 0.00 15.46
4.90 15.69 0.00 15.69
5.00 15.92 0.00 15.92
5.10 16.15 0.00 16.14

Mars Hill University Student Center, 1-yr Storm Detention (Pos Type II 24-hr Rainfall=2.25"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 9
Stage-Area-Storage for Pond 1 P: StormTech Detention
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
0.00 1,029 0 5.20 1,029 3,266
0.10 1,029 41 5.30 1,029 3,308
0.20 1,029 82 5.40 1,029 3,349
0.30 1,029 123 5.50 1,029 3,390
0.40 1,029 165
0.50 1,029 206
0.60 1,029 247
0.70 1,029 288
0.80 1,029 351
0.90 1,029 435
1.00 1,029 518
1.10 1,029 602
1.20 1,029 685
1.30 1,029 768
1.40 1,029 850
1.50 1,029 932
1.60 1,029 1,014
1.70 1,029 1,095
1.80 1,029 1,175
1.90 1,029 1,256
2.00 1,029 1,335
2.10 1,029 1,415
2.20 1,029 1,493
2.30 1,029 1,571
2.40 1,029 1,648
2.50 1,029 1,725
2.60 1,029 1,801
2.70 1,029 1,876
2.80 1,029 1,950
2.90 1,029 2,023
3.00 1,029 2,096
3.10 1,029 2,167
3.20 1,029 2,237
3.30 1,029 2,306
3.40 1,029 2,374
3.50 1,029 2,440
3.60 1,029 2,505
3.70 1,029 2,568
3.80 1,029 2,629
3.90 1,029 2,689
4.00 1,029 2,745
4.10 1,029 2,798
4.20 1,029 2,847
4.30 1,029 2,893
4.40 1,029 2,936
4.50 1,029 2,978
4.60 1,029 3,020
4.70 1,029 3,061
4.80 1,029 3,102
4.90 1,029 3,143
5.00 1,029 3,184
5.10 1,029 3,225

Mars Hill University Student Center, 10-yr Storm Detention (Po Type Il 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 1S: Runoff
Mars Hill University Student Center., 10-yr Storm Event (Post-Construction)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 1.020 cfs @ 11.90 hrs, Volume= 2,245 cf, Depth= 3.73"
Routed to Pond 1 P : StormTech Detention
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Type II 24-hr Rainfall=3.96"
Area (ac) CN Description
* 0.166 98 Pavements, Sidewalks, Roofs
0.166 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.3 75 0.0200 0.93 LagICN Method,
Subcatchment 1 S: Runoff
Hydrograph
❑Runoff II
I t.ozcock'L -...
1- Type II 24;hr-
Rainfall=3.96'1'
I I I I I
. Runoff
unoff I re a=0.1 6,6 'ac
Runoff;V;o1,ume=2,I1245 cf
Runoff DepthlF 3.73"
I I I I
LL
Flow Length)=75'
iI I I I I i I
Slope,0.0200, 'I'
Tc=111.3 min
CN=.98
III III
„ . I
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)

Mars Hill University Student Center, 10-yr Storm Detention (Po Type II 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 2
Hydrograph for Subcatchment 1S: Runoff
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.000 26.00 3.96 3.73 0.000
0.50 0.02 0.00 0.000 26.50 3.96 3.73 0.000
1.00 0.04 0.00 0.000 27.00 3.96 3.73 0.000
1.50 0.06 0.00 0.001 27.50 3.96 3.73 0.000
2.00 0.09 0.01 0.003 28.00 3.96 3.73 0.000
2.50 0.11 0.02 0.004 28.50 3.96 3.73 0.000
3.00 0.14 0.03 0.005 29.00 3.96 3.73 0.000
3.50 0.16 0.05 0.005 29.50 3.96 3.73 0.000
4.00 0.19 0.06 0.006 30.00 3.96 3.73 0.000
4.50 0.22 0.08 0.007
5.00 0.25 0.11 0.008
5.50 0.28 0.13 0.009
6.00 0.32 0.16 0.010
6.50 0.35 0.19 0.011
7.00 0.39 0.22 0.011
7.50 0.43 0.26 0.012
8.00 0.48 0.30 0.013
8.50 0.52 0.34 0.016
9.00 0.58 0.39 0.019
9.50 0.65 0.45 0.020
10.00 0.72 0.52 0.025
10.50 0.81 0.61 0.033
11.00 0.93 0.72 0.046
11.50 1.12 0.91 0.077
12.00 2.63 2.40 0.339
12.50 2.91 2.68 0.061
13.00 3.06 2.83 0.041
13.50 3.16 2.93 0.031
14.00 3.25 3.01 0.025
14.50 3.32 3.08 0.022
15.00 3.38 3.15 0.020
15.50 3.44 3.20 0.018
16.00 3.48 3.25 0.015
16.50 3.53 3.30 0.014
17.00 3.57 3.34 0.014
17.50 3.61 3.38 0.013
18.00 3.65 3.41 0.012
18.50 3.68 3.45 0.011
19.00 3.71 3.48 0.010
19.50 3.74 3.51 0.009
20.00 3.77 3.54 0.009
20.50 3.80 3.56 0.008
21.00 3.82 3.59 0.008
21.50 3.84 3.61 0.008
22.00 3.87 3.63 0.008
22.50 3.89 3.66 0.008
23.00 3.92 3.68 0.008
23.50 3.94 3.70 0.007
24.00 3.96 3.73 0.006
24.50 3.96 3.73 0.000
25.00 3.96 3.73 0.000
25.50 3.96 3.73 0.000

Mars Hill University Student Center, 10-yr Storm Detention (Po Type II 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: StormTech Detention
Detention Facility
Inflow Area = 7,231 sf,100.00% Impervious, Inflow Depth = 3.73"
Inflow = 1.020 cfs @ 11.90 hrs, Volume= 2,245 cf
Outflow = 0.078 cfs @ 12.38 hrs, Volume= 927 cf, Atten= 92%, Lag= 29.0 min
Discarded = 0.001 cfs @ 3.55 hrs, Volume= 141 cf
Primary = 0.077 cfs @ 12.38 hrs, Volume= 786 cf
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Peak Elev= 2.15' @ 12.38 hrs Surf.Area= 1,029 sf Storage= 1,453 cf
Plug-Flow detention time= 349.3 min calculated for 925 cf (41% of inflow)
Center-of-Mass det. time= 203.8 min ( 947.6 - 743.8 )
Volume Invert Avail.Storage Storage Description
#1A 0.00' 1,511 cf 29.92'W x 34.38'L x 5.50'H Field A
5,657 cf Overall - 1,878 cf Embedded = 3,779 cf x 40.0%Voids
#2A 0.75' 1,878 cf ADS_StormTech MC-3500 d +Cap x 16 Inside#1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
16 Chambers in 4 Rows
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
3,390 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device Routing Invert Outlet Devices
#1 Primary 0.75' 18.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#2 Device 1 2.00' 8.0"Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#3 Device 1 3.00' 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
0.5' Crest Height
#4 Discarded 0.00' 0.060 in/hr Exfiltration over Surface area Phase-In= 0.01'
Discarded OutFlow Max=0.001 cfs @ 3.55 hrs HW=0.06' (Free Discharge)
1--4=Exfiltration (Exfiltration Controls 0.001 cfs)
Primary OutFlow Max=0.077 cfs @ 12.38 hrs HW=2.15' (Free Discharge)
L1=Orifice/Grate (Passes 0.077 cfs of 6.910 cfs potential flow)
12=Orifice/Grate (Orifice Controls 0.077 cfs @ 1.31 fps)
3=Sharp-Crested Rectangular Weir ( Controls 0.000 cfs)

Mars Hill University Student Center, 10-yr Storm Detention (Po Type /I 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 4
Pond 1 P: StormTech Detention - Chamber Wizard Field A
Chamber Model =ADS_StormTech MC-3500 d +Cap (ADS StormTech®MC-3500 d rev 03/14 with Cap
volume)
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
77.0" Wide + 9.0" Spacing = 86.0" C-C Row Spacing
4 Chambers/Row x 7.17' Long +1.85' Cap Length x 2 = 32.38' Row Length +12.0" End Stone x 2 = 34.38'
Base Length
4 Rows x 77.0" Wide + 9.0" Spacing x 3 + 12.0" Side Stone x 2 = 29.92' Base Width
9.0" Stone Base +45.0" Chamber Height + 12.0" Stone Cover = 5.50' Field Height
16 Chambers x 110.0 cf+ 14.9 cf Cap Volume x 2 x 4 Rows = 1,878.4 cf Chamber Storage
5,656.9 cf Field - 1,878.4 cf Chambers = 3,778.5 cf Stone x 40.0% Voids = 1,511.4 cf Stone Storage
Chamber Storage + Stone Storage = 3,389.8 cf = 0.078 of
Overall Storage Efficiency = 59.9%
Overall System Size = 34.38' x 29.92' x 5.50'
16 Chambers
209.5 cy Field
139.9 cy Stone

Mars Hill University Student Center, 10-yr Storm Detention (Po Type II 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD®10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 5
Pond 1 P: StormTech Detention
Hydrograph
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 I I I I I I I I I I I I I I I ■inflow
I I I 1 I I I I I I I I I I
t.ozo as I ❑Outflow
IrifloW Area=7', 231 sf i1�Discarded
❑Primary
Peak Elev 2.1;5'
1- I I I I I
Storage=t,453 cf
3
0
L
0.078 cis
0.001 Us 0.077 cfs s01‘�i� i'
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
Pond 1 P: StormTech Detention
Stage-Discharge
I
I ❑Total
////: ■Discarded
NgPrimary
5- % I I
/O 7-- - /
--,--i
d '
% / J.f-
/.' ' Sharp-Crested Rectangular Weir
3-
c
o ,/
°' :- iOrifice/Grate i
w 2
I
I
I I
1-' rf+�t�fiseofftil
, , , , , , ,,z,,
j%'" Exriltration
Discharge (cfs)

Mars Hill University Student Center, 10-yr Storm Detention (Po Type II 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 6
Pond 1 P: StormTech Detention
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 100 200 300 400 500 600 700 800 900 1,000 0 Surface
❑Storage I
/ 1 , •
I
1 1 I
� r r r 7r r r �
1 1 1 1
5 d
1 H
I I 1
,- +------1- *
I I
4 I 1 1 1
I
__ 1 L L L -- -_J L-- 1 J
W I 1 / I /
w I I
3- I // / I f%
p i , ,,,/� I 1'
CO
I
_� 2 �� ����I / I
I
/// i L JL J
j/// 1 1 0
1 ADS StormTech MC-3500 d+Cap' I
, - 1
I 1
I i I I 1
- (field Ai -
0 500 1,000 1,500 2,000 2,500 3,000
Storage(cubic-feet)

Mars Hill University Student Center, 10-yr Storm Detention (Po Type II 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 7
Hydrograph for Pond 1 P: StormTech Detention
Time Inflow Storage Elevation Outflow Discarded Primary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.000 0 0.00 0.000 0.000 0.000
1.00 0.000 0 0.00 0.000 0.000 0.000
2.00 0.003 5 0.01 0.000 0.000 0.000
3.00 0.005 16 0.04 0.001 0.001 0.000
4.00 0.006 30 0.07 0.001 0.001 0.000
5.00 0.008 51 0.12 0.001 0.001 0.000
6.00 0.010 77 0.19 0.001 0.001 0.000
7.00 0.011 110 0.27 0.001 0.001 0.000
8.00 0.013 149 0.36 0.001 0.001 0.000
9.00 0.019 202 0.49 0.001 0.001 0.000
10.00 0.025 273 0.66 0.001 0.001 0.000
11.00 0.046 390 0.85 0.001 0.001 0.000
12.00 0.339 1,366 2.04 0.007 0.001 0.006
13.00 0.041 1,428 2.12 0.051 0.001 0.050
14.00 0.025 1,405 2.09 0.029 0.001 0.028
15.00 0.020 1,394 2.07 0.022 0.001 0.021
16.00 0.015 1,385 2.06 0.018 0.001 0.016
17.00 0.014 1,380 2.06 0.015 0.001 0.013
18.00 0.012 1,376 2.05 0.013 0.001 0.011
19.00 0.010 1,373 2.05 0.011 0.001 0.010
20.00 0.009 1,370 2.04 0.009 0.001 0.008
21.00 0.008 1,368 2.04 0.009 0.001 0.007
22.00 0.008 1,367 2.04 0.008 0.001 0.007
23.00 0.008 1,367 2.04 0.008 0.001 0.006
24.00 0.006 1,366 2.04 0.007 0.001 0.006
25.00 0.000 1,349 2.02 0.004 0.001 0.002
26.00 0.000 1,339 2.00 0.002 0.001 0.001
27.00 0.000 1,333 2.00 0.001 0.001 0.000
28.00 0.000 1,328 1.99 0.001 0.001 0.000
29.00 0.000 1,323 1.98 0.001 0.001 0.000
30.00 0.000 1,318 1.98 0.001 0.001 0.000

Mars Hill University Student Center, 10-yr Storm Detention (Po Type II 24-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 8
Stage-Discharge for Pond 1 P: StormTech Detention
Elevation Discharge Discarded Primary Elevation Discharge Discarded Primary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
0.00 0.000 0.000 0.000 5.20 16.368 0.001 16.367
0.10 0.001 0.001 0.000 5.30 16.588 0.001 16.587
0.20 0.001 0.001 0.000 5.40 16.805 0.001 16.803
0.30 0.001 0.001 0.000 5.50 17.019 0.001 17.018
0.40 0.001 0.001 0.000
0.50 0.001 0.001 0.000
0.60 0.001 0.001 0.000
0.70 0.001 0.001 0.000
0.80 0.001 0.001 0.000
0.90 0.001 0.001 0.000
1.00 0.001 0.001 0.000
1.10 0.001 0.001 0.000
1.20 0.001 0.001 0.000
1.30 0.001 0.001 0.000
1.40 0.001 0.001 0.000
1.50 0.001 0.001 0.000
1.60 0.001 0.001 0.000
1.70 0.001 0.001 0.000
1.80 0.001 0.001 0.000
1.90 0.001 0.001 0.000
2.00 0.001 0.001 0.000
2.10 0.037 0.001 0.035
2.20 0.136 0.001 0.134
2.30 0.286 0.001 0.284
2.40 0.472 0.001 0.471
2.50 0.678 0.001 0.676
2.60 0.874 0.001 0.873
2.70 1.019 0.001 1.018
2.80 1.150 0.001 1.148
2.90 1.267 0.001 1.265
3.00 1.374 0.001 1.372
3.10 1.895 0.001 1.893
3.20 2.781 0.001 2.780
3.30 3.926 0.001 3.925
3.40 5.297 0.001 5.296
3.50 6.877 0.001 6.876
3.60 8.655 0.001 8.654
3.70 10.625 0.001 10.623
3.80 12.780 0.001 12.779
3.90 13.183 0.001 13.182
4.00 13.455 0.001 13.454
4.10 13.721 0.001 13.720
4.20 13.983 0.001 13.981
4.30 14.239 0.001 14.238
4.40 14.491 0.001 14.490
4.50 14.739 0.001 14.738
4.60 14.983 0.001 14.981
4.70 15.222 0.001 15.221
4.80 15.458 0.001 15.457
4.90 15.691 0.001 15.689
5.00 15.920 0.001 15.918
5.10 16.146 0.001 16.144

Mars Hill University Student Center, 10-yr Storm Detention (Po Type 1124-hr Rainfall=3.96"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 9
Stage-Area-Storage for Pond 1 P: StormTech Detention
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
0.00 1,029 0 5.20 1,029 3,266
0.10 1,029 41 5.30 1,029 3,308
0.20 1,029 82 5.40 1,029 3,349
0.30 1,029 123 5.50 1,029 3,390
0.40 1,029 165
0.50 1,029 206
0.60 1,029 247
0.70 1,029 288
0.80 1,029 351
0.90 1,029 435
1.00 1,029 518
1.10 1,029 602
1.20 1,029 685
1.30 1,029 768
1.40 1,029 850
1.50 1,029 932
1.60 1,029 1,014
1.70 1,029 1,095
1.80 1,029 1,175
1.90 1,029 1,256
2.00 1,029 1,335
2.10 1,029 1,415
2.20 1,029 1,493
2.30 1,029 1,571
2.40 1,029 1,648
2.50 1,029 1,725
2.60 1,029 1,801
2.70 1,029 1,876
2.80 1,029 1,950
2.90 1,029 2,023
3.00 1,029 2,096
3.10 1,029 2,167
3.20 1,029 2,237
3.30 1,029 2,306
3.40 1,029 2,374
3.50 1,029 2,440
3.60 1,029 2,505
3.70 1,029 2,568
3.80 1,029 2,629
3.90 1,029 2,689
4.00 1,029 2,745
4.10 1,029 2,798
4.20 1,029 2,847
4.30 1,029 2,893
4.40 1,029 2,936
4.50 1,029 2,978
4.60 1,029 3,020
4.70 1,029 3,061
4.80 1,029 3,102
4.90 1,029 3,143
5.00 1,029 3,184
5.10 1,029 3,225

Mars Hill University Student Center, 25-yr Storm Detention (Po Type 1124-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 1
Summary for Subcatchment 1 S: Runoff
Mars Hill University Student Center, 25-yr. Storm Event (Post-Construction)
[49] Hint: Tc<2dt may require smaller dt
Runoff = 1.22 cfs @ 11.90 hrs, Volume= 2,702 cf, Depth= 4.48"
Routed to Pond 1 P : StormTech Detention
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span=0.00-30.00 hrs, dt= 0.05 hrs
Type II 24-hr Rainfall=4.72"
Area (ac) CN Description
* 0.166 98 Pavement, Sidewalks, Roofs
0.166 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
1.3 75 0.0200 0.93 Lag/CN Method,
Subcatchment 1 S: Runoff
Hydrograph
I I I
D Runoff
I I I
112�s I I
Type II 24-1hr
I I I I I
_1-J--L-4--1----L-L_.�____ L. J. 1 , Rainfall.=4.72"__
1_ , / I
Runoff AI I I Irea=0.166 ac
Runoff Volume 2,:702�, cf
• I I � I I
Runoff Depth=4.48''
I I I I I I I I
FIo iv'1 Length)I=75I'
LL I I I
Slope;0.0200,
Tc=1 .3imin
CN=p8
I I I
//.// �/fi/�/./0.3zz. ,
i/���i/��
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)

Mars Hill University Student Center, 25-yr Storm Detention (Po Type 11 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD®10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 2
Hydrograph for Subcatchment 1S: Runoff
Time Precip. Excess Runoff Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs) (hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00 26.00 4.72 4.48 0.00
0.50 0.02 0.00 0.00 26.50 4.72 4.48 0.00
1.00 0.05 0.00 0.00 27.00 4.72 4.48 0.00
1.50 0.08 0.01 0.00 27.50 4.72 4.48 0.00
2.00 0.10 0.01 0.00 28.00 4.72 4.48 0.00
2.50 0.13 0.03 0.01 28.50 4.72 4.48 0.00
3.00 0.16 0.05 0.01 29.00 4.72 4.48 0.00
3.50 0.19 0.07 0.01 29.50 4.72 4.48 0.00
4.00 0.23 0.09 0.01 30.00 4.72 4.48 0.00
4.50 0.26 0.11 0.01
5.00 0.30 0.14 0.01
5.50 0.34 0.17 0.01
6.00 0.38 0.21 0.01
6.50 0.42 0.25 0.01
7.00 0.47 0.29 0.01
7.50 0.52 0.33 0.02
8.00 0.57 0.38 0.02
8.50 0.62 0.43 0.02
9.00 0.69 0.50 0.02
9.50 0.77 0.57 0.02
10.00 0.85 0.65 0.03
10.50 0.96 0.75 0.04
11.00 1.11 0.90 0.05
11.50 1.34 1.12 0.09
12.00 3.13 2.90 0.40
12.50 3.47 3.24 0.07
13.00 3.64 3.41 0.05
13.50 3.77 3.54 0.04
14.00 3.87 3.64 0.03
14.50 3.95 3.72 0.03
15.00 4.03 3.79 0.02
15.50 4.10 3.86 0.02
16.00 4.15 3.92 0.02
16.50 4.21 3.97 0.02
17.00 4.26 4.02 0.02
17.50 4.30 4.07 0.02
18.00 4.35 4.11 0.01
18.50 4.39 4.15 0.01
19.00 4.43 4.19 0.01
19.50 4.46 4.23 0.01
20.00 4.49 4.26 0.01
20.50 4.52 4.29 0.01
21.00 4.55 4.32 0.01
21.50 4.58 4.35 0.01
22.00 4.61 4.38 0.01
22.50 4.64 4.40 0.01
23.00 4.67 4.43 0.01
23.50 4.69 4.46 0.01
24.00 4.72 4.48 0.01
24.50 4.72 4.48 0.00
25.00 4.72 4.48 0.00
25.50 4.72 4.48 0.00

Mars Hill University Student Center, 25-yr Storm Detention (Po Type II 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 3
Summary for Pond 1 P: StormTech Detention
Detention Pond
Inflow Area = 7,231 sf,100.00% Impervious, Inflow Depth = 4.48"
Inflow = 1.22 cfs @ 11.90 hrs, Volume= 2,702 cf
Outflow = 0.36 cfs @ 12.02 hrs, Volume= 1,384 cf, Atten= 71%, Lag= 7.1 min
Discarded = 0.00 cfs @ 3.00 hrs, Volume= 143 cf
Primary = 0.36 cfs @ 12.02 hrs, Volume= 1,240 cf
Routed to nonexistent node 1 R
Routing by Stor-Ind method, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs
Peak Elev= 2.34' @ 12.02 hrs Surf.Area= 1,029 sf Storage= 1,604 cf
Plug-Flow detention time= 285.2 min calculated for 1,384 cf (51% of inflow)
Center-of-Mass det. time= 159.0 min ( 899.6 - 740.6 )
Volume Invert Avail.Storage Storage Description
#1A 0.00' 1,511 cf 29.92'W x 34.38'L x 5.50'H Field A
5,657 cf Overall - 1,878 cf Embedded = 3,779 cf x 40.0%Voids
#2A 0.75' 1,878 cf ADS_StormTech MC-3500 d +Cap x 16 Inside#1
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap
16 Chambers in 4 Rows
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
3,390 cf Total Available Storage
Storage Group A created with Chamber Wizard
Device Routing Invert Outlet Devices
#1 Primary 0.75' 18.00"Vert. Orifice/Grate C= 0.600
Limited to weir flow at low heads
#2 Device 1 2.00' 8.00" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads
#3 Device 1 3.00' 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
0.5' Crest Height
#4 Discarded 0.00' 0.060 in/hr Exfiltration over Surface area Phase-In= 0.01'
Discarded OutFlow Max=0.00 cfs @ 3.00 hrs HW=0.06' (Free Discharge)
t-4=Exfiltration (Exfiltration Controls 0.00 cfs)
Primary OutFlow Max=0.34 cfs @ 12.02 hrs HW=2.33' (Free Discharge)
t1=Orifice/Grate (Passes 0.34 cfs of 7.75 cfs potential flow)
t 2=Orifice/Grate (Orifice Controls 0.34 cfs @ 1.95 fps)
3=Sharp-Crestecl Rectangular Weir ( Controls 0.00 cfs)

Mars Hill University Student Center, 25-yr Storm Detention (Po Type II 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 4
Pond 1 P: StormTech Detention - Chamber Wizard Field A
Chamber Model =ADS_StormTech MC-3500 d +Cap (ADS StormTech®MC-3500 d rev 03/14 with Cap
volume)
Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf
Overall Size= 77.0"W x 45.0'H x 7.50'L with 0.33' Overlap
Cap Storage= 14.9 cf x 2 x 4 rows = 119.2 cf
77.0" Wide + 9.0" Spacing = 86.0" C-C Row Spacing
4 Chambers/Row x 7.17' Long +1.85' Cap Length x 2 = 32.38' Row Length +12.0" End Stone x 2 = 34.38'
Base Length
4 Rows x 77.0" Wide + 9.0" Spacing x 3 + 12.0" Side Stone x 2 = 29.92' Base Width
9.0" Stone Base + 45.0" Chamber Height + 12.0" Stone Cover = 5.50' Field Height
16 Chambers x 110.0 cf+ 14.9 cf Cap Volume x 2 x 4 Rows = 1,878.4 cf Chamber Storage
5,656.9 cf Field - 1,878.4 cf Chambers = 3,778.5 cf Stone x 40.0% Voids = 1,511.4 cf Stone Storage
Chamber Storage + Stone Storage = 3,389.8 cf = 0.078 of
Overall Storage Efficiency = 59.9%
Overall System Size = 34.38' x 29.92' x 5.50'
16 Chambers
209.5 cy Field
139.9 cy Stone

Mars Hill University Student Center, 25-yr Storm Detention (Po Type II 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD®10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 5
Pond 1 P: StormTech Detention
Hydrograph
/ , , I I
I' I I
I I
I I 0 Inflow
Finds ; D Outflow
Inflow Area=7 231 sf L7Discarded
O Primary
I
-r-r- -r- - -r-1- -7- - -1--I--I--I- --Peak- Elev 2.34'
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Time (hours)
Pond 1 P: StormTech Detention
Stage-Discharge
I I I
❑Total
1 * I. ■Discarded
/ ®Primary
1 .1
• 7
";"//// - -I
• ,, '/ter` I - Y/ - :.. I
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0 2 4 6 8 10 12 14 16
Discharge (cfs)

Mars Hill University Student Center, 25-yr Storm Detention (Po Type II 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD®10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 6
Pond 1 P: StormTech Detention
Stage-Area-Storage
Surface/Horizontal/Wetted Area(sq-ft)
0 100 200 300 400 500 600 700 800 900 1,000 ❑Surface`
1 �� 0 Storage
i
I pr 1 t r nr
I 1
1 i
5 I 1
I 1 t
I
II ,---I- 1 r __ ____..__ ___i
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0 500 1,000 1,500 2,000 2,500 3,000
Storage(cubic-feet)

Mars Hill University Student Center, 25-yr Storm Detention (Po Type II 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 7
Hydrograph for Pond 1P: StormTech Detention
Time Inflow Storage Elevation Outflow Discarded Primary
(hours) (cfs) (cubic-feet) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0 0.00 0.00 0.00 0.00
1.00 0.00 0 0.00 0.00 0.00 0.00
2.00 0.00 8 0.02 0.00 0.00 0.00
3.00 0.01 23 0.06 0.00 0.00 0.00
4.00 0.01 43 0.11 0.00 0.00 0.00
5.00 0.01 71 0.17 0.00 0.00 0.00
6.00 0.01 106 0.26 0.00 0.00 0.00
7.00 0.01 148 0.36 0.00 0.00 0.00
8.00 0.02 197 0.48 0.00 0.00 0.00
9.00 0.02 263 0.64 0.00 0.00 0.00
10.00 0.03 350 0.80 0.00 0.00 0.00
11.00 0.05 491 0.97 0.00 0.00 0.00
12.00 0.40 1,597 2.33 0.35 0.00 0.34
13.00 0.05 1,439 2.13 0.06 0.00 0.06
14.00 0.03 1,411 2.10 0.03 0.00 0.03
15.00 0.02 1,401 2.08 0.03 0.00 0.02
16.00 0.02 1,392 2.07 0.02 0.00 0.02
17.00 0.02 1,385 2.06 0.02 0.00 0.02
18.00 0.01 1,381 2.06 0.02 0.00 0.01
19.00 0.01 1,377 2.05 0.01 0.00 0.01
20.00 0.01 1,373 2.05 0.01 0.00 0.01
21.00 0.01 1,371 2.05 0.01 0.00 0.01
22.00 0.01 1,370 2.04 0.01 0.00 0.01
23.00 0.01 1,370 2.04 0.01 0.00 0.01
24.00 0.01 1,369 2.04 0.01 0.00 0.01
25.00 0.00 1,350 2.02 0.00 0.00 0.00
26.00 0.00 1,340 2.01 0.00 0.00 0.00
27.00 0.00 1,334 2.00 0.00 0.00 0.00
28.00 0.00 1,329 1.99 0.00 0.00 0.00
29.00 0.00 1,323 1.99 0.00 0.00 0.00
30.00 0.00 1,318 1.98 0.00 0.00 0.00

Mars Hill University Student Center, 25-yr Storm Detention (Po Type 11 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 8
Stage-Discharge for Pond 1 P: StormTech Detention
Elevation Discharge Discarded Primary Elevation Discharge Discarded Primary
(feet) (cfs) (cfs) (cfs) (feet) (cfs) (cfs) (cfs)
0.00 0.00 0.00 0.00 5.20 16.37 0.00 16.37
0.10 0.00 0.00 0.00 5.30 16.59 0.00 16.59
0.20 0.00 0.00 0.00 5.40 16.80 0.00 16.80
0.30 0.00 0.00 0.00 5.50 17.02 0.00 17.02
0.40 0.00 0.00 0.00
0.50 0.00 0.00 0.00
0.60 0.00 0.00 0.00
0.70 0.00 0.00 0.00
0.80 0.00 0.00 0.00
0.90 0.00 0.00 0.00
1.00 0.00 0.00 0.00
1.10 0.00 0.00 0.00
1.20 0.00 0.00 0.00
1.30 0.00 0.00 0.00
1.40 0.00 0.00 0.00
1.50 0.00 0.00 0.00
1.60 0.00 0.00 0.00
1.70 0.00 0.00 0.00
1.80 0.00 0.00 0.00
1.90 0.00 0.00 0.00
2.00 0.00 0.00 0.00
2.10 0.04 0.00 0.04
2.20 0.14 0.00 0.13
2.30 0.29 0.00 0.28
2.40 0.47 0.00 0.47
2.50 0.68 0.00 0.68
2.60 0.87 0.00 0.87
2.70 1.02 0.00 1.02
2.80 1.15 0.00 1.15
2.90 1.27 0.00 1.27
3.00 1.37 0.00 1.37
3.10 1.89 0.00 1.89
3.20 2.78 0.00 2.78
3.30 3.93 0.00 3.92
3.40 5.30 0.00 5.30
3.50 6.88 0.00 6.88
3.60 8.66 0.00 8.65
3.70 10.62 0.00 10.62
3.80 12.78 0.00 12.78
3.90 13.18 0.00 13.18
4.00 13.45 0.00 13.45
4.10 13.72 0.00 13.72
4.20 13.98 0.00 13.98
4.30 14.24 0.00 14.24
4.40 14.49 0.00 14.49
4.50 14.74 0.00 14.74
4.60 14.98 0.00 14.98
4.70 15.22 0.00 15.22
4.80 15.46 0.00 15.46
4.90 15.69 0.00 15.69
5.00 15.92 0.00 15.92
5.10 16.15 0.00 16.14

Mars Hill University Student Center, 25-yr Storm Detention (Po Type II 24-hr Rainfall=4.72"
Prepared by Davis Civil Solutions P A Printed 4/23/2024
HydroCAD® 10.20-4b s/n 03655 ©2023 HydroCAD Software Solutions LLC Page 9
Stage-Area-Storage for Pond 1 P: StormTech Detention
Elevation Surface Storage Elevation Surface Storage
(feet) (sq-ft) (cubic-feet) (feet) (sq-ft) (cubic-feet)
0.00 1,029 0 5.20 1,029 3,266
0.10 1,029 41 5.30 1,029 3,308
0.20 1,029 82 5.40 1,029 3,349
0.30 1,029 123 5.50 1,029 3,390
0.40 1,029 165
0.50 1,029 206
0.60 1,029 247
0.70 1,029 288
0.80 1,029 351
0.90 1,029 435
1.00 1,029 518
1.10 1,029 602
1.20 1,029 685
1.30 1,029 768
1.40 1,029 850
1.50 1,029 932
1.60 1,029 1,014
1.70 1,029 1,095
1.80 1,029 1,175
1.90 1,029 1,256
2.00 1,029 1,335
2.10 1,029 1,415
2.20 1,029 1,493
2.30 1,029 1,571
2.40 1,029 1,648
2.50 1,029 1,725
2.60 1,029 1,801
2.70 1,029 1,876
2.80 1,029 1,950
2.90 1,029 2,023
3.00 1,029 2,096
3.10 1,029 2,167
3.20 1,029 2,237
3.30 1,029 2,306
3.40 1,029 2,374
3.50 1,029 2,440
3.60 1,029 2,505
3.70 1,029 2,568
3.80 1,029 2,629
3.90 1,029 2,689
4.00 1,029 2,745
4.10 1,029 2,798
4.20 1,029 2,847
4.30 1,029 2,893
4.40 1,029 2,936
4.50 1,029 2,978
4.60 1,029 3,020
4.70 1,029 3,061
4.80 1,029 3,102
4.90 1,029 3,143
5.00 1,029 3,184
5.10 1,029 3,225

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Soil Map—Madison County,North Carolina Mars Hill University Student Center
/lap Unit Legend
Map Unit Symbol Wlap Unit Name • Acres in AO1 Percent of AOI
CxC Clifton-Urban land complex,2 0.1 89.6%
to 15 percent slopes
UhE Udorthents-Urban land 0.0 10.4%0
•
complex,2 to 50 percent
slopes
Totals for Area of Interest 0.2 100.0%
USDA Natural Resources Web Soil Survey 9/12/2023
Conservation Service National Cooperative Soil Survey Page 3 of 3

Map Unit Description:Clifton-Urban land complex,2 to 15 percent slopes--Madison County, Mars Hill University Student Center
North Carolina
Madison County, North Carl ihiia
CxC--C ifton'Urban land complex, 2 to 15 percent slopes
Map Unit Setting
National map unit symbol: 1 t357
Elevation: 1,850 to 2,450 feet
Mean annual precipitation: 35 to 50 inches
Mean annual air temperature: 46 to 57 degrees F
Frost-free period: 130 to 180 days
Farmland classification: Not prime farmland
Map Unit Composition
Clifton and similar soils: 50 percent
Urban land:40 percent
Estimates are based on observations, descriptions, and transects of
the map unit.
Description of Clifton
Setting
Landform: Ridges
Down-slope shape:Convex
Across-slope shape: Linear
Parent material: Residuum weathered from amphibolite or
hornblende gneiss
Typical profile
Ap-0 to 8 inches: clay loam
Bt-8 to 55 inches: clay
C-55 to 80 inches: loam
Properties and qualities
Slope:8 to 15 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.57 to 1.98 inlhr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: High(about 10.5 inches)
Interpretive groups
Land capability classification(irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Ecological site: F130BY007WV- Low Mountain Mesic Residuum
Hydric soil rating: No
USDA Natural Resources Web Soil Survey 9/12/2023
Conservation Service National Cooperative Soil Survey Page 1 of 2

Map Unit Description:Clifton-Urban land complex,2 to 15 percent slopes--Madison County, Mars Hill University Student Center
North Carolina
Description of Urban Land
Setting
Parent material: Streets, parking lots, buildings,and other
structures
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8
Hydric soil rating: No
Data Source [Information
Soil Survey Area: Madison County, North Carolina
Survey Area Data: Version 20, Sep 12, 2022
USDA Natural Resources Web Soil Survey 9/12/2023
Conservation Service National Cooperative Soil Survey Page 2 of 2

Map Unit Description:Udorthents-Urban land complex,2 to 50 percent slopes---Madison Mars Hill University Student Center
County,North Carolina
Madison County, N.rth Carolina
UhE—Udorthents-Urban land CornpOex, 2 to 50 percent
slopes
Map Unit Setting
National map unit symbol: 1t3b1
Elevation: 1,090 to 3,830 feet
Mean annual precipitation: 50 to 64 inches
Mean annual air temperature: 46 to 57 degrees F
Frost-free period: 124 to 176 days
Farmland classification: Not prime farmland
Map Unit Composition
Udorthents and similar soils: 55 percent
Urban land:35 percent
Estimates are based on observations, descriptions, and transects of
the mapunit.
Description of Udorthents
Setting
Landform position (two-dimensional): Backslope, footslope,
toeslope
Down-slope shape: Convex, linear
Across-slope shape: Linear
Parent material: Loamy to skeletal cut and fill
Typical profile
C-0 to 80 inches: cobbly sandy loam
Properties and qualities
Slope:2 to 50 percent
Surface area covered with cobbles, stones or boulders:0.1 percent
Depth to restrictive feature:More than 80 inches
Drainage class: Somewhat excessively drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat):Very low
to very high (0.00 to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 8.4
inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Ecological site: F130BY012WV- Non-Hydric Floodplains
Hydric soil rating: No
USDA Natural Resources Web Soil Survey 9/12/2023
Conservation Service National Cooperative Soil Survey Page 1 of 2

Map Unit Description:Udorthents-Urban land complex,2 to 50 percent slopes---Madison Mars Hill University Student Center
County,North Carolina
Description of Urban Land
Setting
Parent material:Streets, parking lots, buildings,and other
structures
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8s
Hydric soil rating: No
Data Source !Information
Soil Survey Area: Madison County, North Carolina
Survey Area Data: Version 20, Sep 12, 2022
USDA Natural Resources Web Soil Survey 9/12/2023
a Conservation Service National Cooperative Soil Survey Page 2 of 2

www.nws.noaa.gov
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. :,? Home Site Map Organization Search
General Information NOAA ATLAS 14 POINT PRECIPITATION FREQUENCY ESTIMATES: NC
Homspage
Progress Rep oris Data description
FAQ .. .. _
Glossary
Data type: Precipitation depth v Units: English v• Time series type:i Partial duration v
Precipitation Select location
Frequency
Data Server 1)Manually:
GIS Grids a)By location(decimal degrees,use"-'for S and W): Latitude:I, I Longitude:( ) Submit
Maps
Time Series b)By station(list of NC stations):;Select station _ '.,i
Temporals
Documents c)By address( Mars Hill University Student Center,N X I Os
Probable Maximum
Precipitation 2)Use map:
Documents , / ,(y i
•
- /ram •\ 1,_ Jff I r j t .1 a)Select location
Miscellaneous Map v -'). , )I l ..
•"( Move crosshair or double click
Publications 0 Terrain ' /
Storm Analysis ./� �. . f'I 7t) t • lot- I.1 i ' b)Click on station icon
/, •�./ /,! � ir i 'K= Show stations on map
Record Precipitation i,i ,. / / (( 0•
' \Contact Us
inquiries - . ' ./ - Location information:
-_-I - I ),, -.i ,_ • Name:Mars Hill,North Carolina,
_* 1 USA'
� ygOV �Q��. 1 I• r -c.): Latitude:35.8269°
. , :t i • l (I ! Longitude:-82.6519*
-:.:/rrs H 3 I i' -' '/ Elevation:2277 ft"
r Cole. . i 0 _ gege {-------- Its_ �`i.
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POiNT PRECIPITATION FREQUENCY(PF) ESTIMATES
WITH 90%CONFIDENCE INTERVALS AND SUPPLEMENTARY INFORMATION
NOAA Atlas 14,Volume 2,Version 3
PF tabular PF graphical Supplementary information j Print page
PDS-based precipitation frequency estimates with 90%confidence intervals(in inches)'
Average recurrence interval(years)
Duration i 1 II 2 I 5 II 10 II 25 II 50 II 100 II 200 II 500 I 1000
5-min 0.329 0.389 0.467 0.528 0.606 0.665 0.724 0.781 0.856 0.914
(0.298-0.364) (0.353-0.431) (0.423.0.518) (0.477-0.584) (0.544-0.669) (0.593.0.735) (0.641-0.800) (0.688.0.867) (0.745.0.954) I (0.788-1.02)
10-min 0.526 0.622 0.749 0.844 0.966 1.06 1.15 1.24 1.35 7.44
(0.475-0.582) (0.565.0.689) (0.677-0.829) (0.762-0.934) (0.867-1.07) (0.944.1.17) (1.02-1.27) (1.09-1.37) (1.18-1.51) (1.24.1.61)
15-min 0.657 0.782 0.947 1.07 1.22 1.34 1.45 1.56 1.70 I 7.81
(0.594-0.727) (0.710.0.866) (0.856-1.05) (0.964-1.18) (1.104.35) (1.20.1.48) (1.29-1.61) (1.38-1.73) (1.48.1.90) (1.56-2.02)
I30-min 0.901 1.08 1.35 1.55 1.81 2.02 2.23 2.43 2.71 2.92
I (0.815-0.997) (0.981-1.20) (1.22-1.49) (1.40-1.71) (1.63-2.00) (1.80.2.23) (1.97-2.46) (2.14.2.70) (2.36-3.02) 1 (2.52-3.28)
60-min 1.12 1.36 1.72 2.01 2.42 2.74 3.07 3.41 3.89 4.27
(1.02-1.24) II (1.23-1.50) (1.56-1.91) (1.82-2.23) (2.17.2.67) (2.44-3.02) (2.72-3.39) (3.00-3.78) (3.39.4.34) (3.68.4.79)
2-hr 1.26 1.52 1.94 2.28 2.75 3.13 3.53 3.94 4.51 4.96
(1.15-1.40) II (1.38-1.69) (1.76-2.14) (2.06-2.51) (2.46.3.03) (2.79.3.45) (3.12-3.89) (3.46-4.36) (3.90-5.02) (4.25-5.55)
ii _-_ II II ,,,, II ,74 II AIa II A50 II 5.35

e-hr 1.61 1.90 2.36 2.75 3.31 3.79 4.29 4.83 5.59 6.20
(1.48-1.77) (1.74-2.08) (2.15-2.58) (2.50-3.00) (2.99-3.62) (3.404.13) (3.81-4.69) (4.25-5.29) (4.84-6.16) (5.29-6.84)
2.01 2.37 2.91 3.36 3.97 4.46 4.95 5.45 6.11 6,59
12-hr (1.85-2.19) (2.19-2.59) (2.68-3.18) (3.08.3.65) (3.63.4.31) (4.06-4.85) (4.49-5.39) (4.91-5.95) (5.46-6.71) (5.85-7.28)
24 hr 2.25 2.72 3.41 3.96 4.72 5.31 5.92 6.52 7.33 7.94
(2.09-2.43) (2.52-2.94) (3.16-3.69) (3.67-4.28) (4.35-5.08) (4.90-5.72) (5.44-6.37) (5.98.7.02) (6.70-7.88) (7.25-8.53)
2-day 2.68 3.22 4.01 4.62 5.45 6.09 6.74 7.38 8.23 8.85
(2.49-2.88) (3.00-3.47) (3.73-4.31) (4.29-4.97) (5.05-5.85) (5.64.6.54) (6.23-7.23) (6.81-7.92) (7.57.8.82) (8.14.9.47)
3-day 2.86 3.44 4.24 4.87 5.72 6.38 7.04 7.69 8.54 9.17
(2,67.3.07) (3.21-3.69) (3.96.4.55) (4.54-5.22) (5.32.6.12) (5.92.6.82) (6.51-7.52) (7.11-8.23) (7.88-9.13) (8.44.9.79)
4-day 3.04 3.65 4.48 5.12 5.99 6.66 7.34 8.00 8.86 9.49
(2.85-3.26) (3.42-3.90) (4.19-4.79) (4.79-5.47) (5.58-6.39) (6.20-7.11) (6.80-7.82) (7.41-8.53) (8.18-9.45) (8.76-10.1)
7-day 3.65 4.36 5.28 5.99 6.92 7.65 8.36 9.07 9.98 10.6
(3.44-3.89) (4.10-4.64) (4.96-5.62) (5.62-6.36) (6.49-7.35) (7.15.8.11) (7.80.8.87) (8.44.9.62) (9.26-10.6) (9.86-11.3)
10-day 4.21 5.01 5.99 6.74 7.72 8.47 9.21 9.93 10.9 11.5
(3.97-4.48) (4.72-5.33) (5.64-6.36) (6.34-7.15) (7.25-8.18) (7.94.8.98) (8.61.9.76) (9.2740.5) (10.1-11.5) (10.7-12.2)
20-day 5.82 6.87 8.07 9.00 10.2 11.2 12.1 13.0 14.1 15.0
(5.50-6.17) (6.50-728) (7.62-8.55) (8.49.9.54) (9.63-10.8) (10.5-11.8) (11.3-12.8) (12.1-13.8) (13.245.0) (13.9-15.9)
30-day 7.29 8.56 9.82 10.7 11.9 12.8 13.6 14.4 15.4 16.1
(6.94-7.67) (8.15-9.01) (9.34-10.3) (10.2.11.3) (11.3-12.5) (121-13.5) (12.9-14.3) (13.6-15.2) (14.5-16.2) (15.2-17.0)
45-day 9.27 10.8 12.2 13.2 14.4 15.4 16.2 17.0 17.9 18.6
(8.86-9.70) (10.4.11.3) (11.7-12.8) (12.6.13.8) (13.845.1) (14.746.1) (15.4.16.9) (16.2.17.8) (17.1-18.8) (17.7-19.5)
60-day 11.1 13.0 14.5 15.6 17.0 18.1 19.0 19.9 20.9 21.7
(10.7-11.6) (12.4-13.5) (13.9-15.1) (15.0.16.3) (16.3-17.8) (17.3-18.8) (18.2-19.8) (19.0-20.8) (20.0-21.9) (20.7-22.7)
1 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 NOAAAtlas 14 document for more Information.
Estimates from the table in CSV format: Precipitation frequency estimates v Submit
•
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Map Unit Description:Clifton-Urban land complex,2 to 15 percent slopes---Madison County, Mars Hill University Student Center
North Carolina
„ad s.n Cvunty, North Carolina
CxC®Clifton-Urban land complex, 2 to 15 percent slopes
Map Unit Setting
National map unit symbol: 1t357
Elevation: 1,850 to 2,450 feet
Mean annual precipitation: 35 to 50 inches
Mean annual air temperature: 46 to 57 degrees F
Frost-free period: 130 to 180 days
Farmland classification: Not prime farmland
Map Unit Composition
Clifton and similar soils:50 percent
Urban land:40 percent
Estimates are based on observations, descriptions, and transects of
the mapunit.
Description of Clifton
Setting
Landform: Ridges
Down-slope shape: Convex
Across-slope shape: Linear
Parent material: Residuum weathered from amphibolite or
hornblende gneiss
Typical profile
Ap-0 to 8 inches: clay loam
Bt- 8 to 55 inches: clay
C-55 to 80 inches: loam
Properties and qualities
Slope:8 to 15 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.57 to 1.98 inlhr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: High(about 10.5 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Ecological site: F130BY007WV-Low Mountain Mesic Residuum
Hydric soil rating: No
USDA Natural Resources Web Soil Survey 9/12/2023
Conservation Service National Cooperative Soil Survey Page 1 of 2

Map Unit Description:Clifton-Urban land complex,2 to 15 percent slopes---Madison County, Mars Hill University Student Center
North Carolina
Description of Urban Land
Setting
Parent material: Streets, parking lots, buildings,and other
structures
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8
Hydric soil rating: No
Data Source Onformataon
Soil Survey Area: Madison County, North Carolina
Survey Area Data: Version 20, Sep 12, 2022
USDA Natural Resources Web Soil Survey 9/12/2023
f' Conservation Service National Cooperative Soil Survey Page 2 of 2

Map Unit Description:Udorthents-Urban land complex,2 to 50 percent slopes---Madison Mars Hill University Student Center
County,North Carolina
i1adoson County, North Carolina
UhE—Udorthents Urban land complex, 2 to 50 percent
slopes
Map Unit Setting
National map unit symbol: 1t3b1
Elevation: 1,090 to 3,830 feet
Mean annual precipitation: 50 to 64 inches
Mean annual air temperature: 46 to 57 degrees F
Frost-free period: 124 to 176 days
Farmland classification: Not prime farmland
Map Unit Composition
Udorthents and similar soils:55 percent
Urban land:35 percent
Estimates are based on observations, descriptions, and transects of
the mapunit.
Description of Udorthents
Setting
Landform position (two-dimensional): Backslope, footslope,
toeslope
Down-slope shape:Convex, linear
Across-slope shape: Linear
Parent material: Loamy to skeletal cut and fill
Typical profile
C- 0 to 80 inches: cobbly sandy loam
Properties and qualities
Slope:2 to 50 percent
Surface area covered with cobbles, stones or boulders:0.1 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Somewhat excessively drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat):Very low
to very high (0.00 to 19.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding:None
Available water supply, 0 to 60 inches: Moderate (about 8.4
inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 7e
Hydrologic Soil Group: A
Ecological site: F130BY012WV- Non-Hydric Floodplains
Hydric soil rating: No
USDA Natural Resources Web Soil Survey 9/12/2023
Conservation Service National Cooperative Soil Survey Page 1 of 2

Map Unit Description:Udorthents-Urban land complex,2 to 50 percent slopes---Madison Mars Hill University Student Center
County,North Carolina
Description of Urban Land
Setting
Parent material: Streets, parking lots, buildings,and other
structures
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8s
Hydric soil rating: No
Data Source Onformation
Soil Survey Area: Madison County, North Carolina
Survey Area Data: Version 20, Sep 12, 2022
USDA Natural Resources Web Soil Survey 9/12/2023
Conservation Service National Cooperative Soil Survey Page 2 of 2

NOAA Atlas 14,Volume 2,Version 3
,,,.•. Location name:Township 3,Mars Hill,North .
Carolina,USA* OflR 1.
Latitude:35.8269°,Longitude:-82.5505° `
Elevation:2322 ft**
-�'�<„s•.'� 'source:ESRI Maps
"source:USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
GAL Bonnln,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 wfith.90%confidence intervals(in incheslhour)1
Average recurrence interval(years)
DurationI 1 I 2 5 10 25 50 100 200 500 1000
15-min 3.95 4.67 5.60 6.34 7.27 7.98 8.69 9.37 10.3 11.0
(3.58-4.37) (4.24-5.17) (5.08-6.22) , (5.72-7.01) (6.53-8.03) (7.12-8.82) (7.69-9.60) (8.26-10.4) (8.94-11.4) (9.46-12.3)
10-min 3.16 3.73 4.49 5.06 5.80 6.35 6.90 7.43 8.12 8.63
(2.85-3.49) (3.39-4.13) (4.06-4.97) (4.57-5.60) (5.20-6.40) (5:66-7.02) (6.11-7.63) (6.54-8.24),, (7.07-9.05) (7.45-9.68)
3.13 3.79 4.27 4.90 5.36 5.81 6.26 6.82 7.22
I. 15-min I 2.63(2.38-2.91) (2.84-3,46) (3.42-4.20) (3.86-4.72) (4.40-5.41) (4.78-5.92) (5.15-6.43) (5.50-6.94) (5.94-7.60) (6.23-8.10)
30-min 1.80 2.16 2.69 3.09 3.63 4.04 4.45 4.87 5.42 6.85
(1.63-1.99) (1.96-2.39) (2.43-2.98) (2.79-3.42) (3.25-4.01) (3.60-4.46) (3.95-4.92) (4.28-5.40) (4.72-6.05) (5.04-6.56)
60-min 1.12 1.36 1.72 2.01 2.42 2.74 3.07 3.41 3.89 4.27
(1.02-1.24) (1.23-1.50) (1.56-1.91) (1.82-2.23) (2.17-2.67) (2.44-3.02) (2.72-3.39) (3.00-3.78) (3.39-4.34) (3.68-4.79)
L 2-hr 0.632 0.762 IL 0.971 1.14 1.37 1.56 1.76 1.97 2.26 2.48
(0.573-0.699) (0.691-0.843)i .878-1.07) (1.03-1.26) (1.23-1.51) (1.39-1.72) (1.56-1.95) (1.73-2.18) (1.95-2.51) (2.12-2.77)
0.444 0.629 0.670 0.786 0.952 1.09 1.24 1.39 1.61 1.78
I 3-hr I(0.403-0.492) (0.481-0.587) (0,608-0.740) (0.710-0.886) (0.854-1.05) (0.971-1.20) (1.09-1.36) (1.22-1.54) (1.38-1.79) (1.52-1.99)
6-hr 0.269 0.317 0.393 0.458 I 0.653 0.632 0.716 I 0.806 0.934 1.03
I(0.246-0.295) (0.290-0.347) (0.359-0.431) (0.417-0.501)i(0.499-0.603) (0.567-0.690) (0.636-0.783),(0.709-0.883) (0.807-1.03) (0.883-1.14)
12-hr 0.166 0.196 0.241 0.278 0.329 0.369 0.410 0.462 0.507 0.547
(0.153-0.181) (0.181-0.214) (0.222-0.263) (0.255-0.303) (0.301-0.358) (0.337-0.402) (0.372-0.447) (0.407-0.493) (0.453-0.557) (0.485-0.603)
0.093 0.113 " 0.142 0.165 0.196 0.221 0.246 0.271 I 0.305 0.330
I 24-hr I(0.087-0.101) (0.105-0.122) (0.131-0.153) (0.152-0.178) (0.181-0.211) (0.203-9.238) (0.226-0.265) (0.249-0.292)i(0.279-0.328) (0.301-0.355)
2-day 0.055 0.067 0.083 0.096 0.113 0.126 0.140 0.153 0.171 0.184
(0.051-0.059),(0.062-0.072) (0.077-0.089) (0.089-0.103),(0.105-0.121) (0.117-0.136) (0.129-0.150) (0.141-0.164) (0.157-0.183),(0.169-0.197)
3-day ( 0.039 0.047 0.058 0.067 0.079 0.088 0.097 0.106 0.118 0.127
0 037-0.042) (0.044-0.051) (0.055-0.063) (0.063-0.072) (0.073-0.085) (0.082-0.094) (0.090-0.104) (0.098-0.114) (0.109-0.126) (0.117-0.135)
4-day0.031 0,037 I 0.046 0.053 0.062 0.069 0.076 0.083 0.092 I 0.098
I(0.029-0.033)�(0.035-0.040),(0.043-0.049) (0.049-0.057) (0.058-0.066) (0.064-0.074) (0.070.0.081) (0.077-0.088) (0.085-0.098),(0.091-0.105)
7-day 0.021 0.025 0.031 0.035 0.041 0.046 0.049 0.063 0.059 0.063
(0.020-0.023) (0.024-0.027) (0.029-0.033) (0.033-0.037) (0.038-0.043) (0.042-0.048) (0.046-0.052) (0.050-0.057) (0.055-0.083) (0.058-0.067)
10-day 0.017 0.020 0.024 0.028 I 0.032 0.035 0.038 0.041 0.045 0.048
(0.016-0.018) (0.019-0.022) (0.023-0.026) (0.026-0.029)1(0.030-0.034) (0.033-0.037) (0.035-0.040) (0.038-0.043) (0.042-0.048) (0.044-0.050)
20-day 0.012 0.014 0.016 0.018 I 0.021 0.023 0.025 0.027 0.029 0.031
(0.011-0.012) (0.013-0.015) (0.015-0.017) (0.017-0.019)1(0.020-0.022) (0.021-0.024) (0.023-0.026) (0.025-0.028) (0.027-0.031) (0.029-0.033)
30-day 0.010 0.011 0.013 I 0.014 I 0.016 0.017 0.018 0.019 0.021 0.022
(0.009-0.010),(0.011-0.012) (0.012-0.014)l(0.014-0.015),(0.015-0.017) (0.016-0.018) (0.017-0.019) (0.018-0.021) (0.020-0.022) (0.021-0.023)
45-day 0.008 0.010 I 0.011 0.012 I 0.013 0.014 0.014 0.015 0.016 I 0.017
(0.008-0.008) (0.009-0.010)1(0.010-0.011) (0.011-0.012)I(0.012-0.013) (0.013-0.014) (0.014-0.015) (0.014-0.016) (0.015-0.017)i(0.016-0.018)
160-day 0.007 0.009 0.010 I 0.010 0.011 0.012 0.013 0.013 0.014 0.015
(0.007-0.008)(0.008-0.009) (0.009-0.010)1(0.010-0.011) (0.011-0.012) (0.011-0.013) (0.012.0.013) (0.013-0.014) (0.013-0.015) (0.014-0.015)
1 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

•
BLACK ELL. HALL
RENOVATIONS AND AP DITiONS
-STORM DRAINAGE PIPE FLOW CHART , ARS HILL UNIVESITY
MADISON COUNTY,NORTH CAROLINA
•
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OCS Project#20168 Page 1
2/27/2024

Project: Ma I, -c,t r l•edk PIMA,
Project No.: 'MI In t
111141111
Description: IAIF-ItilakI O S1tO. R10E OW
Davis CivilSolutions, PA Calculated By:
z Site/Infrastructure• Engineering/Planning Checked By:
i } 135-AChar1otteHighwa}»Ash eville,NorthCaeo1ina28803 Date: kOl�+V r/� I/tiff3
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