SWA000214_Stormwater Report_20230705

NAPA Auto and MSUC
Stormwater Calculations
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Venture Engineering Inc. ¢ SEAL �_
lts 12047 •Q,
209 Highway 544 1 6-8z3 fay;
Conway, C 29526 ,ti0 m,ti �
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y' •hill ill\��
Phone: [phone] NC P#-1900
Fax: [phone]

Stormwater Narrative
The following results are for NAPA Auto and MSUC. The site is located off U.S. Hwy 74
Bypass (College Street). The total tract area is 1.64 acres and will consist of 2 commercial
buildings with 1.55 acres of disturbance. For stormwater management the site will use a series
of pipes and catch basins to control post development runoff.
It was determined that the majority of the pre-development runoff flows south towards the
NCDOT right-of-way of Hwy 74. In its existing condition the site has been reviewed and consists
mostly of open area in fair condition. The majority of soil on site consists of Pacolet sandy clay.
The attached soils map from the USDA website shows the different types of soils onsite.
Weighted curve numbers and times of concentration have been calculated for each individual
basin reflecting their characteristics in the pre-development stage and are shown in the report.
During the construction process, sediment and erosion control measures will be taken on-site.
Proposed catch basins will be equipped with silt sacks for inlet protection. Silt fence will be
placed in all applicable areas on the site. Rip-rap energy dissipaters will be installed at the
outlets of pipes to avoid scour. Construction entrances will be installed in the appropriate
location to prevent sediment tracking from construction vehicles.
Post development, weighted curve numbers and times of concentration have been calculated
for each individual basin. A curve number of 98 was used for all impervious areas including the
ponds, buildings, and pavement areas. Post-development runoff will be directed toward
proposed catch basins which are then routed to the proposed ponds.
Water quality for the site has been calculated using a 1.0" of rainfall over the entire built upon
area. A sand filter will be used as the primary SMC to treat the water quality volume. Details of
the proposed sand filter can be found in the plans provided. The weir in the drop structure will
be set at an elevation above the required water quality storage volume. The weir will only
discharge after the first 1.0" of water has been stored. Listed below is a summary of the results
of the stormwater calculations.

Design Summary Spreadsheet
Pre-Development Basin Data
Area(Ac.)
Basin Weighted CN Concentration(min.)
Pre-Basin I 1.47 61 11.8
Pre-Developed Flow Rates
SCS Method
1-Yr 10-Yr 100-Yr
Basin (cfs) (cfs) (cfs)
Pre-Basin I 0.61 3.19 6.97
Post-Developed Basin Data
Area(Ac.)
Basin Weighted CN Concentration(min.)
Post-Basin I (Detained) 1.47 83 5.00
Post-Developed Flow Rates
SCS Method
(Pre-Detention Flows) 1-Yr 10-Yr 100-Yr
Basin (cfs) (cfs) (cfs)
Post-Basin I (Detained 3.34 7.44 12.21
Detention Pond Design - Pond I
Storm Event Peak Pond EL Peak Inflow Peak Outflow
(ft) (cfs) (cfs)
1-year 983.25 3.34 0.48
10-year 984.41 7.44 3.00
100-year 984.82 12.21 13.23
Pre vs. Post Flows
1-Yr 10-Yr 100-Yr
Basin I (cfs) (cfs) (cfs)
Pre-Developed 0.61 3.19 6.97
Post-Developed 0.48 3.00 13.23
01.04.2023 Project:Shield Tract Mini-Storage

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4/4/23, 1:11 PM Precipitation Frequency Data Server
NOAA Atlas 14,Volume 2,Version 3
.V O C\ Location name: Forest City,North Carolina,USA* ''''0Latitude:35.3392°,Longitude: -81.8957° none
% Elevation:m/ft** 1 i
OV
'os *source:ESRI Maps "a„, �.p
ma`s **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)1
Average recurrence interval(years)
Duration 1 2 5 10 25 50 100 200 500 1000
5-min 0.393 0.467 0.554 0.621 0.707 0.771 0.836 0.901 0.985 1.05
(0.357-0.432) (0.425-0.513) (0.504-0.609) (0.563-0.681) (0.638-0.776) (0.692-0.846) (0.746-0.919) (0.798-0.992) (0.864-1.09) (0.915-1.17)
10-min 0.627 0.746 0.887 I 0.993 1.13 1.23 1.33 1.43 1.56 1.66
(0.570-0.690) (0.680-0.821) (0.806-0.975) (0.900-1.09) (1.02-1.24) (1.10-1.35) (1.19-1.46) (1.26-1.57) I (1.37-1.73) (1.44-1.85)
15-min 0.784 0.938 1.12 1.26 1.43 1.56 I 1.68 1.80 I 1.96 2.08
(0.713-0.862) (0.855-1.03) (1.02-1.23) (1.14-1.38) (1.29-1.57) 1 (1.40-1.71) (1.50-1.85) (1.60-1.99) (1.72-2.17) (1.81-2.32)
30-min 1.08 1.30 1.59 1.82 2.12 2.34 2.57 2.81 3.12 3.37
(0.978-1.18) (1.18-1.43) (1.45-1.75) ,_(1.65-2.00) (1.91-2.32) (2.10-2.57) (2.30-2.83) (2.49-3.09) (2.74-3.45) (2.93-3.75)
60-min 1.34 1.63 2.04 2.37 2.82 3.17 3.54 3.93 4.48 4.93
(1.22-1.47) (1.48-1.79) (1.86-2.25) (2.15-2.60) (2.54-3.09) (2.85-3.48) I (3.16-3.89) (3.49-4.33) (3.93-4.96) (4.27-5.48)
2-hr 1.56 1.90 2.40 2.79 3.35 3.82 I 4.31 4.84 5.61 6.25
(1.42-1.72) (1.73-2.09) (2.18-2.63) (2.53-3.07) (3.02-3.68) (3.42-4.19) (3.83-4.74) (4.27-5.34) (4.89-6.21) (5.39-6.95)
3-hr 1.68 2.03 2.56 2.99 3.62 4.15 4.73 5.37 6.31 7.11
(1.53-1.86)_ (1.85-2.25) (2.32-2.83) (2.70-3.30) (3.24-4.00) (3.70-4.59) (4.17-5.23) (4.69-5.96) (5.43-7.03) _(6.05-7.96)
6-hr 2.13 2.57 3.19 3.72 4.50 5.16 5.90 6.71 7.92 1 8.97
(1.96-2.34) (2.35-2.82) (2.91-3.50) (3.38-4.08) (4.06-4.93) I (4.63-5.66) I (5.23-6.47) (5.89-7.38) (6.83-8.75) (7.63-9.95)
12-hr 2.65 3.19 3.97 4.60 I 5.51 6.27 I 7.10 7.99 9.32 10.4
(2.43-2.91) (2.93-3.50) (3.63-4.35) (4.19-5.04) (4.99-6.04) (5.65-6.88) (6.34-7.79) (7.07-8.79) I 9.32 10.4
(9.01-11.6)
24-hr 3.20 3.86 4.83 5.60 6.65 7.49 8.37 9.27 10.5 1 11.5
(2.98-3.45) (3.59-4.17) (4.49-5.21) (5.19-6.03) (6.14-7.16) (6.90-8.06) (7.67-8.99) (8.47-9.97) (9.56-11.3) (10.4-12.4)
2-day 3.81 4.58 5.69 6.56 7.76 8.72 9.70 10.7 12.1 13.2
(3.55-4.10) (4.28-4.93) (5.31-6.12) (6.11-7.05) (7.20-8.33) (8.06-9.36) (8.94-10.4) (9.84-11.5) (11.1-13.0) (12.0-14.3)
3-day 4.05 4.86 6.00 6.89 8.12 9.09 10.1 11.1 12.5 13.6
(3.79-4.34) (4.55-5.21) (5.60-6.43) (6.43-7.38) (7.55-8.68) (8.43-9.72) (9.32-10.8) (10.2-11.9) (11.5-13.4)I (12.4-14.7)
4-day 4.29 5.14 6.30 7.22 8.47 9.46 10.5 11.5 12.9 14.0
(4.02-4.59) (4.82-5.49) (5.90-6.74) (6.74-7.71) 1 (7.89-9.04) (8.79-10.1) (9.70-11.2) (10.6-12.3) (11.9-13.8) (12.9-15.1)
7-day 5.00 5.96 7.23 8.24 9.62 10.7 11.8 13.0 14.5 15.7
(4.69-5.33) (5.60-6.36) (6.79-7.71) (7.73-8.78) (9.00-10.2) (9.99-11.4) (11.0-12.6) (12.0-13.8) (13.4-15.5) (14.5-16.8)
-
10-day 5.70 6.78 8.12 9.18 10.6 11.7 12.8 14.0 15.5 16.7
(5.38-6.07) (6.39-7.21) (7.65-8.63) (8.64-9.75) (9.94-11.2) (11.0-12.4) (12.0-13.6) (13.0-14.8) (14.4-16.5) (15.4-17.8)
20-day 7 7.63 I 9.01 10.6 11.8 13.5 14.8 16.1 17.4 I 19.1 20.5
(7.23-8.06) (8.52-9.51) (10.0-11.2) (11.2-12.5) (12.7-14.3) (13.9-15.6) I (15.1-17.0) (16.3-18.4) (17.8-20.3) (19.0-21.7)
30-day 9.33 11.0 12.7 14.0 15.8 17.1 18.4 19.6 21.3 22.6
(8.88-9.83) (10.4-11.5) (12.1-13.4) (13.3-14.8) (14.9-16.6) (16.2-18.0) (17.3-19.3) (18.5-20.7) (20.0-22.5) (21.1-23.9)
45-day 11.8 13.8 15.7 17.2 19.0 20.4 21.7 23.0 24.6 25.8
(11.3-12.4) (13.2-14.5) (15.0-16.5) (16.3-18.0) (18.1-19.9) (19.4-21.3) (20.6-22.7) (21.8-24.1) (23.3-25.9) (24.4-27.2)
60-day 14.1 16.4 18.5 20.1 22.1 23.5 24.9 26.3 28.0 1 29.3
(13.5-14.7) (15.7-17.2) (17.7-19.4) I (19.2-21.0) I (21.0-23.1) (22.4-24.6) I (23.7-26.1) (25.0-27.6) (26.6-29.4) (27.7-30.8)
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.
IPlease refer to NOAAAtlas 14 document for more information.
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PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.3392&Ion=-81.8957&data=depth&units=english&series=pds 1/4

4/4/23, 1:11 PM Precipitation Frequency Data Server
PDS-based depth-duration-frequency (DDF) curves
Latitude: 35.3392°, Longitude: -81.8957°
30 I 1 1 r
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25 interval
(years)
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c 15 - _ — 10-min — 3-day
15-rnin — 4-day
+� — 30-min — 7-day
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— 3fir — 30-day
— 6fir - 45-day
— 12fir — 60-day
i
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1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Tue Apr 4 17:10:47 2023
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Maps & aerials
Small scale terrain
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4/4/23, 1:11 PM Precipitation Frequency Data Server
Kingsport_•_gristol
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aF Hydrologic Soil Group—Rutherford County, North Carolina
a
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418290 418330 418370 418410 418450 418490 418530 418570
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418290 418330 418370 418410 418450 418490 418530
3 3
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Map Scale:1:1,840 if punted on A portrait(8.5"x 11")sheet. N
Meters
m N 0 25 50 100 150 w
Feet
0 50 100 200 300
Map projection:Web Mercator Corner coordinates:WGS84 Edge tics:UTM Zone 17N WGS84
USDA Natural Resources Web Soil Survey 4/4/2023
1111-1-111 Conservation Service National Cooperative Soil Survey Page 1 of 4

Hydrologic Soil Group—Rutherford County,North Carolina
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) p c The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) 1:24,000.
0 C/D
Soils • D Warning:Soil Map may not be valid at this scale.
Soil Rating Polygons
l A p Not rated or not available Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
n A/D Water Features line placement.The maps do not show the small areas of
Streams and Canals contrasting soils that could have been shown at a more detailed
n B scale.
Transportation
Q B/D
r4-1. Rails Please rely on the bar scale on each map sheet for map
n C measurements.
ti Interstate Highways
C/D US Routes Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
0 D Major Roads Coordinate System: Web Mercator(EPSG:3857)
n Not rated or not available Local Roads
Maps from the Web Soil Survey are based on the Web Mercator
Soil Rating Lines Background projection,which preserves direction and shape but distorts
• • A distance and area.A projection that preserves area,such as the
1111 Aerial Photography Albers equal-area conic projection,should be used if more
• • A/D accurate calculations of distance or area are required.
^r B This product is generated from the USDA-NRCS certified data as
, B/D of the version date(s)listed below.
• r C Soil Survey Area: Rutherford County,North Carolina
Survey Area Data: Version 24,Sep 12,2022
• • C/D
Soil map units are labeled(as space allows)for map scales
• • D 1:50,000 or larger.
• w Not rated or not available Date(s)aerial images were photographed: Apr 22,2022—May
Soil Rating Points 10,2022
p A The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
O A/D imagery displayed on these maps.As a result,some minor
• B shifting of map unit boundaries may be evident.
• B/D
USDA Natural Resources Web Soil Survey 4/4/2023
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group—Rutherford County,North Carolina
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
CaB2 Cecil sandy clay loam,2 B 3.6 24.6%
to 8 percent slopes,
moderately eroded
ChA Chewacla loam,0 to 2 B/D 2.2 14.9%
percent slopes,
frequently flooded
PaC2 Pacolet sandy clay B 8.3 56.9%
loam,8 to 15 percent
slopes,moderately
eroded
UdC Udorthents,loamy,0 to C 0.5 3.6%
15 percent slopes
Totals for Area of Interest 14.6 100.0%
USDA Natural Resources Web Soil Survey 4/4/2023
1111-1. Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Rutherford County, North Carolina
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential)when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential)when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff.None Specified
Tie-break Rule: Higher
USDA Natural Resources Web Soil Survey 4/4/2023
Conservation Service National Cooperative Soil Survey Page 4 of 4

National Flood Hazard Layer FIRMette - FEMA _Legend
81°54'3"W 35°20'36"N SEE EIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
al,
FEET N g73 FEET WithoutZoone , Base
Flood Elevation(BFE)972'7 With BFE or Depth Zone AE,AO,AH,VE,AR
Zone AE SPECIAL FLOOD
��� HAZARD AREAS Regulatory Floodway
1
•4111,1151\ • A
1 , Zone AE roli r 0.2%Annual Chance Flood Hazard,Areas
• 1 Q72.FEET
�1 ♦ of 1%annual chance flood with average
. ._1
• I - • depth less than one foot or with drainage
4411/ • ' areas of less than one square mile zonex
• Q 1972 3 Future Conditions 1%Annual
oRn re,-, FEET _ Chance Flood Hazard zonex
' 967 FEET Area with Reduced Flood Risk due to
• / / a -jr- OTHER AREAS OF �" Levee.See Notes.zone x
r (`
r - {1 FLOOD HAZARD ��� Area with Flood Risk due to Leveezone D
7` 966 FEE�51 FEET • • A
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116 ir \ .
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965 FEET III Effective LOMRs
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' OTHER AREAS Area of Undetermined Flood Hazard ZoneD
• , _ FEES GENERAL ---—- Channel,Culvert,or Storm Sewer
.� • )96A' \ STRUCTURES I I I I I I I Levee,Dike,or Floodwall
r
O 20.2 Cross Sections with 1%Annual Chance
AREA OF MINIMAL FLLOOD HAZARD 963FE�t. FEET t'S Water Surface Elevation
2 a— — — Coastal Transect
41Zone X 3 7 10 4 3900J M` -^^^^513^^^^" Base Flood Elevation Line(BFE)
•• . .fet TO eff..7/2/2008 CITY ' ' Limit of Study
• - • ' Jurisdiction Boundary
/ • lir
_ _ --- Coastal Transect Baseline
370218 . OTHER _ — Profile Baseline
AVri
962E FEET
..• 1. - • ♦ `9', FEATURES Hydrographic Feature
a a
`�• •• , 1le ( 12'FEE ` Digital Data Available N
l :I ~ ._ � No Digital Data Available:• FLOODWAY MAP PANELS Unmapped
I ' . ojo .n'.1A.
ZDe E ��
'� e(� The pin displayed on the map is an approximate
• \ .J3 , point selected by the user and does not represent
Zone`s���40.` an authoritative property location.
,t
" N
J'��~ \ This map complies with FEMA's standards for the use of
digital flood maps if it is not void as described below.
• Al. � � Zone AE The basemap shown complies with FEMA's basemap
•
a - ♦ • �� \ l accuracy standards
• • �� • Y t 961 t ' The flood hazard information is derived directly from the
�, ',�, \`�` . authoritative NFHL web services provided by FEMA.This map
�•- 1 •
111///961 FEET was exported on 4/17/2023 at 10:02 AM and does not
reflect changes or amendments subsequent to this date and
time.The NFHL and effective information may change or
.00' cf • �� become superseded by new data over time.
mar
' "16"11P:
` , a This map image is void if the one or more of the following map
3710153800J . elements do not appear:basemap imagery,flood zone labels,
legend,scale bar,map creation date,community identifiers,
• k 7/)Mnno \1 .‘k". FIRM panel number,and FIRM effective date.Map images for
Al Feet 1:6 81°53'26"W 35°20'6"N unmapped and unmodernized areas cannot be used for
0 250 500 1,000 1,500 2,000 '��� regulatory purposes.
Basemap:USGS National Map:Orthoimagery:Data refreshed October,2020

HYDRONET RESULTS
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HydroNet Report
Design Settings
Runoff Method: SCS TR-20
Pond Routing Method: Stor-Ind
Reach Routing Method: Stor-Ind
Start Time(hr): 0.00
End Time(hr): 24.00
Time Increment(hr): 0.10
Rainfall Event
Name Storm Type Storm Duration(hr) Rain Depth(in) AMC
1-YR TYPE II 24-HOUR 24 3.20 II
Outflow Result - 1 P
Peak Time 12.30 hrs
Peak Discharge(Qp) 0.48 cfs
Runoff Volume 0.06 acre-ft
Outflow Result - 1S
Peak Time 12.10 hrs
Peak Discharge(Qp) 0.60 cfs
Runoff Volume 0.05 acre-ft
Subcatchment - 1S
Name: PRE-BASIN
Area(sf) CN Soil Group Description
64033 61 B Open Space-Good (>75%grass)
Total Area: 64033
Weighted CN: 61
Tc Calculation Method:TR-55
Tc Length Slope Velocity Description
(min) (ft) (%) (fps)
9.39 100.00 4.50 Sheet Flow
2.36 175.00 3.15 1.24 Shallow Flow
Total Tc(min): 11.75
----Runoff Hydrograph----
Peak Time 12.10 hrs
Peak Discharge(Qp) 0.60 cfs
Runoff Volume 0.05 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
9.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
11.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03
12.00 cfs 0.25 0.60 0.51 0.29 0.21 0.16 0.14 0.13
12.80 cfs 0.12 0.12 0.10 0.10 0.09 0.09 0.08 0.08
13.60 cfs 0.08 0.07 0.07 0.06 0.06 0.06 0.06 0.06
14.40 cfs 0.05 0.05 0.05 0.05 0.04 0.04 0.04 0.04
15.20 cfs 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04
16.00 cfs 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04
16.80 cfs 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
17.60 cfs 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
18.40 cfs 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
19.20 cfs 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03
20.00 cfs 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02
20.80 cfs 0.02 0.01 0.01 0.01 0.03 0.04 0.04 0.03
21.60 cfs 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02
22.40 cfs 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02
23.20 cfs 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02
24.00 cfs 0.02
0.7
Runoff Hydrograph -
0.6
0.5
0.4_
0.3
0.2
0.1
0.0
0 5 10 15 20 25
Time(hour)
Runoff Hydrograph

Subcatchment -2S
Name: POST-BASIN
Outflow Connection: 1P
Area(sf) CN Soil Group Description
26136 61 B Open Space-Good (>75%grass)
37897 98 B Paved Lots Roofs&Driveways
Total Area: 64033
Weighted CN: 83
Tc Calculation Method: Direct Entry
Tc(min): 5.00
Total Tc(min): 5.00
----Runoff Hydrograph----
Peak Time 12.00 hrs
Peak Discharge(Qp) 3.34 cfs
Runoff Volume 0.19 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 cfs 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01
9.60 cfs 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03
10.40 cfs 0.04 0.04 0.05 0.06 0.06 0.08 0.09 0.10
11.20 cfs 0.11 0.12 0.15 0.16 0.54 0.81 1.06 2.78
12.00 cfs 3.34 1.60 0.64 0.58 0.40 0.39 0.34 0.32
12.80 cfs 0.32 0.26 0.26 0.23 0.22 0.21 0.19 0.19
13.60 cfs 0.17 0.16 0.16 0.15 0.15 0.14 0.13 0.13
14.40 cfs 0.12 0.12 0.11 0.10 0.10 0.10 0.10 0.10
15.20 cfs 0.10 0.10 0.09 0.09 0.09 0.09 0.09 0.09
16.00 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.08 0.08
16.80 cfs 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08
17.60 cfs 0.08 0.08 0.07 0.06 0.06 0.06 0.06 0.06
18.40 cfs 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06
19.20 cfs 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.05
20.00 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.03
20.80 cfs 0.03 0.02 0.02 0.07 0.09 0.09 0.05 0.05

21.60 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
22.40 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
23.20 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.03
24.00 cfs 0.03
4
Runoff Hydrograph -
3
U
O
u 2
1
0
0 5 10 15 20 25
Time(hour)
Runoff Hydrograph
Pond - 1 P
Pond- 1P
Inflow Connection: 2S
Inflow Area: 64033 sf
Stage-Storage Data
Elev(Ft) Storage(CF) Storage(Gallon) Storage(CY) Storage(Acre-Ft) Area(SF) Area(Acre)
981.000 0.000 0.000 0.000 0.000 832.270 0.019
982.000 1203.705 9004.338 44.582 0.028 1575.140 0.036
983.000 3184.760 23823.658 117.954 0.073 2386.970 0.055
984.000 6012.840 44979.165 222.698 0.138 3269.190 0.075
985.000 9754.195 72966.443 361.266 0.224 4213.520 0.097
Outlet(s)
Outlet#1:02,Orifice
Shape: Rectangular
Rise: 8.0 in
Width: 12.0 in
Invert Elevation: 983.200 ft
Coefficient: 0.60
Number of Openings: 1
Peak: Elev(ft) Discharge(cfs)
985.000 3.89
Outlet#2:03,Weir
Shape: Sharp-Crested Rectangular Weir w/o Contracted End
Crest Length: 16.000 ft
Invert Elevation: 984.500 ft
Coefficient: 3.33
Number of Openings: 1

Peak: Elev(ft) Discharge(cfs)
985.000 18.84
Outlet#3:01,Exfiltration
Area Type: Pond Bottom Area
Exfiltration Velocity: 2.00 in/hr
Invert Elevation: 981.000 ft
Exfiltration Discharge: 0.04 cfs
Peak: Elev(ft) Discharge(cfs)
985.000 0.04
----Inflow Hydrograph----
Peak Time 12.00 hrs
Peak Discharge(Qp) 3.34 cfs
Runoff Volume 0.19 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 cfs 0.00 0.00 0.01 0.01 0.01 0.01 0.01 0.01
9.60 cfs 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03
10.40 cfs 0.04 0.04 0.05 0.06 0.06 0.08 0.09 0.10
11.20 cfs 0.11 0.12 0.15 0.16 0.54 0.81 1.06 2.78
12.00 cfs 3.34 1.60 0.64 0.58 0.40 0.39 0.34 0.32
12.80 cfs 0.32 0.26 0.26 0.23 0.22 0.21 0.19 0.19
13.60 cfs 0.17 0.16 0.16 0.15 0.15 0.14 0.13 0.13
14.40 cfs 0.12 0.12 0.11 0.10 0.10 0.10 0.10 0.10
15.20 cfs 0.10 0.10 0.09 0.09 0.09 0.09 0.09 0.09
16.00 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.08 0.08
16.80 cfs 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08
17.60 cfs 0.08 0.08 0.07 0.06 0.06 0.06 0.06 0.06
18.40 cfs 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06
19.20 cfs 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.05
20.00 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.03
20.80 cfs 0.03 0.02 0.02 0.07 0.09 0.09 0.05 0.05
21.60 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
22.40 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
23.20 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.03

24.00 cfs 0.03
----Outflow Hydrograph----
Peak Time 12.30 hrs
Peak Discharge(Qp) 0.48 cfs
Peak Elevation 983.245 ft
Runoff Volume 0.06 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
8.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 elev 981.00 981.01 981.00 981.00 981.00 981.00 981.00 981.00
9.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
9.60 elev 981.00 981.00 981.00 981.00 981.00 981.00 981.00 981.00
10.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10.40 elev 981.00 981.00 981.00 981.01 981.01 981.02 981.04 981.05
11.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
11.20 elev 981.07 981.10 981.13 981.16 981.25 981.44 981.71 982.17
12.00 cfs 0.00 0.00 0.36 0.48 0.47 0.41 0.36 0.32
12.00 elev 982.72 983.11 983.23 983.25 983.24 983.23 983.23 983.22
12.80 cfs 0.29 0.26 0.23 0.20 0.18 0.17 0.16 0.15
12.80 elev 983.22 983.21 983.21 983.21 983.21 983.21 983.21 983.21
13.60 cfs 0.14 0.12 0.12 0.11 0.11 0.10 0.09 0.09
13.60 elev 983.21 983.21 983.21 983.20 983.20 983.20 983.20 983.20
14.40 cfs 0.08 0.08 0.07 0.07 0.06 0.06 0.06 0.06

14.40 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
15.20 cfs 0.06 0.06 0.06 0.05 0.05 0.05 0.05 0.05
15.20 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
16.00 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.04
16.00 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
16.80 cfs 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04
16.80 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
17.60 cfs 0.04 0.04 0.04 0.03 0.02 0.02 0.02 0.02
17.60 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
18.40 cfs 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02
18.40 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
19.20 cfs 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01
19.20 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
20.00 cfs 0.01 0.01 0.01 0.01 0.01 0.01 0.00
20.00 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20
985
98,
m
cn 98
98• /
Stage-Storage Curve -
981
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Storage(CF)
Stage-Storage Curve

985
98, /
in 98
98• /
/ Stage-Area Curve —
981
0 1000 2000 3000 4000 5000
Area(Sq.F)
Stage-Area Curve
985
98,
I98
98•
Stage-Discharge Curve —
981
0 5 10 15 20 25
Discharge(CFS)
Stage-Discharge Curve

984.0_
Water Elevation Curve —
983.5
983.0_
m
982.5_
982.0_
981.5_
981.0
0 5 10 15 20 25
Time(hour)
Water Elevation Curve
4
Inflow Hydrograph —
Outflow Hydrograph —
3
U
O
u_ 2
1
0
0 5 10 15 20 25
Time(hour)
Inflow vs. Outflow Hydrograph

HydroNet Report
Design Settings
Runoff Method: SCS TR-20
Pond Routing Method: Stor-Ind
Reach Routing Method: Stor-Ind
Start Time(hr): 0.00
End Time(hr): 24.00
Time Increment(hr): 0.10
Rainfall Event
Name Storm Type Storm Duration(hr) Rain Depth(in) AMC
10-YR TYPE II 24-HOUR 24 5.60 II
Outflow Result - 1 P
Peak Time 12.10 hrs
Peak Discharge(Qp) 3.00 cfs
Runoff Volume 0.31 acre-ft
Outflow Result - 1S
Peak Time 12.10 hrs
Peak Discharge(Qp) 3.16 cfs
Runoff Volume 0.21 acre-ft
Subcatchment - 1S
Name: PRE-BASIN
Area(sf) CN Soil Group Description
64033 61 B Open Space-Good (>75%grass)
Total Area: 64033
Weighted CN: 61
Tc Calculation Method:TR-55
Tc Length Slope Velocity Description
(min) (ft) (%) (fps)
9.39 100.00 4.50 Sheet Flow
2.36 175.00 3.15 1.24 Shallow Flow
Total Tc(min): 11.75
----Runoff Hydrograph----
Peak Time 12.10 hrs
Peak Discharge(Qp) 3.16 cfs
Runoff Volume 0.21 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
9.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
11.20 cfs 0.01 0.02 0.03 0.05 0.07 0.23 0.46 1.01
12.00 cfs 2.26 3.16 2.23 1.17 0.80 0.58 0.50 0.45
12.80 cfs 0.41 0.39 0.35 0.33 0.30 0.28 0.27 0.25
13.60 cfs 0.24 0.22 0.21 0.20 0.19 0.19 0.18 0.17
14.40 cfs 0.17 0.16 0.15 0.14 0.14 0.14 0.14 0.14
15.20 cfs 0.14 0.14 0.13 0.12 0.12 0.12 0.12 0.12
16.00 cfs 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.11
16.80 cfs 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10
17.60 cfs 0.10 0.10 0.10 0.10 0.09 0.08 0.08 0.08
18.40 cfs 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08
19.20 cfs 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08
20.00 cfs 0.07 0.06 0.06 0.06 0.06 0.06 0.06 0.05
20.80 cfs 0.04 0.04 0.03 0.03 0.07 0.11 0.11 0.08
21.60 cfs 0.07 0.06 0.06 0.06 0.06 0.06 0.06 0.06
22.40 cfs 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06
23.20 cfs 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06
24.00 cfs 0.05
4
Runoff Hydrograph -
3
u- 2
1
0
0 5 10 15 20 25
Time(hour)
Runoff Hydrograph

Subcatchment -2S
Name: POST-BASIN
Outflow Connection: 1P
Area(sf) CN Soil Group Description
26136 61 B Open Space-Good (>75%grass)
37897 98 B Paved Lots Roofs&Driveways
Total Area: 64033
Weighted CN: 83
Tc Calculation Method: Direct Entry
Tc(min): 5.00
Total Tc(min): 5.00
----Runoff Hydrograph----
Peak Time 12.00 hrs
Peak Discharge(Qp) 7.44 cfs
Runoff Volume 0.45 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.01
6.40 cfs 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.02
7.20 cfs 0.02 0.02 0.03 0.03 0.03 0.03 0.03 0.03
8.00 cfs 0.03 0.04 0.04 0.05 0.05 0.06 0.06 0.06
8.80 cfs 0.06 0.07 0.07 0.08 0.08 0.09 0.09 0.09
9.60 cfs 0.10 0.11 0.11 0.11 0.12 0.13 0.14 0.14
10.40 cfs 0.17 0.18 0.21 0.23 0.24 0.29 0.30 0.34
11.20 cfs 0.37 0.39 0.48 0.50 1.56 2.21 2.72 6.61
12.00 cfs 7.44 3.43 1.36 1.22 0.84 0.81 0.71 0.67
12.80 cfs 0.66 0.54 0.53 0.47 0.44 0.44 0.39 0.38
13.60 cfs 0.34 0.33 0.32 0.30 0.30 0.28 0.27 0.26
14.40 cfs 0.24 0.24 0.22 0.21 0.21 0.21 0.21 0.21
15.20 cfs 0.21 0.21 0.18 0.18 0.18 0.18 0.18 0.18
16.00 cfs 0.18 0.18 0.18 0.18 0.18 0.18 0.16 0.15
16.80 cfs 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15
17.60 cfs 0.15 0.15 0.15 0.12 0.12 0.12 0.12 0.12
18.40 cfs 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12
19.20 cfs 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.09
20.00 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.07 0.06
20.80 cfs 0.06 0.03 0.03 0.13 0.18 0.17 0.10 0.09

21.60 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09
22.40 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09
23.20 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.06
24.00 cfs 0.06
8
Runoff Hydrograph -
7
6
5_
U
O
L 4
3
2
1
0 5 10 15 20 25
Time(hour)
Runoff Hydrograph
Pond - 1 P
Pond- 1P
Inflow Connection: 2S
Inflow Area: 64033 sf
Stage-Storage Data
Elev(Ft) Storage(CF) Storage(Gallon) Storage(CY) Storage(Acre-Ft) Area(SF) Area(Acre)
981.000 0.000 0.000 0.000 0.000 832.270 0.019
982.000 1203.705 9004.338 44.582 0.028 1575.140 0.036
983.000 3184.760 23823.658 117.954 0.073 2386.970 0.055
984.000 6012.840 44979.165 222.698 0.138 3269.190 0.075
985.000 9754.195 72966.443 361.266 0.224 4213.520 0.097
Outlet(s)
Outlet#1:02,Orifice
Shape: Rectangular
Rise: 8.0 in
Width: 12.0 in
Invert Elevation: 983.200 ft
Coefficient: 0.60
Number of Openings: 1
Peak: Elev(ft) Discharge(cfs)
985.000 3.89
Outlet#2:03,Weir
Shape: Sharp-Crested Rectangular Weir w/o Contracted End
Crest Length: 16.000 ft
Invert Elevation: 984.500 ft
Coefficient: 3.33
Number of Openings: 1

Peak: Elev(ft) Discharge(cfs)
985.000 18.84
Outlet#3:01,Exfiltration
Area Type: Pond Bottom Area
Exfiltration Velocity: 2.00 in/hr
Invert Elevation: 981.000 ft
Exfiltration Discharge: 0.04 cfs
Peak: Elev(ft) Discharge(cfs)
985.000 0.04
----Inflow Hydrograph----
Peak Time 12.00 hrs
Peak Discharge(Qp) 7.44 cfs
Runoff Volume 0.45 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.01
6.40 cfs 0.01 0.01 0.01 0.02 0.02 0.02 0.02 0.02
7.20 cfs 0.02 0.02 0.03 0.03 0.03 0.03 0.03 0.03
8.00 cfs 0.03 0.04 0.04 0.05 0.05 0.06 0.06 0.06
8.80 cfs 0.06 0.07 0.07 0.08 0.08 0.09 0.09 0.09
9.60 cfs 0.10 0.11 0.11 0.11 0.12 0.13 0.14 0.14
10.40 cfs 0.17 0.18 0.21 0.23 0.24 0.29 0.30 0.34
11.20 cfs 0.37 0.39 0.48 0.50 1.56 2.21 2.72 6.61
12.00 cfs 7.44 3.43 1.36 1.22 0.84 0.81 0.71 0.67
12.80 cfs 0.66 0.54 0.53 0.47 0.44 0.44 0.39 0.38
13.60 cfs 0.34 0.33 0.32 0.30 0.30 0.28 0.27 0.26
14.40 cfs 0.24 0.24 0.22 0.21 0.21 0.21 0.21 0.21
15.20 cfs 0.21 0.21 0.18 0.18 0.18 0.18 0.18 0.18
16.00 cfs 0.18 0.18 0.18 0.18 0.18 0.18 0.16 0.15
16.80 cfs 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15
17.60 cfs 0.15 0.15 0.15 0.12 0.12 0.12 0.12 0.12
18.40 cfs 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.12
19.20 cfs 0.12 0.12 0.12 0.12 0.12 0.12 0.12 0.09
20.00 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.07 0.06
20.80 cfs 0.06 0.03 0.03 0.13 0.18 0.17 0.10 0.09
21.60 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09
22.40 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.09
23.20 cfs 0.09 0.09 0.09 0.09 0.09 0.09 0.09 0.06

24.00 cfs 0.06
----Outflow Hydrograph----
Peak Time 12.10 hrs
Peak Discharge(Qp) 3.00 cfs
Peak Elevation 984.408 ft
Runoff Volume 0.31 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.00
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 elev 981.00 981.00 981.00 981.00 981.00 981.00 981.00 981.00
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 elev 981.00 981.00 981.00 981.00 981.00 981.00 981.00 981.00
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 elev 981.00 981.00 981.00 981.00 981.00 981.01 981.02 981.02
8.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 elev 981.03 981.04 981.05 981.06 981.07 981.08 981.10 981.11
9.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
9.60 elev 981.13 981.15 981.17 981.19 981.22 981.24 981.27 981.30
10.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10.40 elev 981.34 981.38 981.42 981.48 981.54 981.60 981.68 981.77
11.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.37
11.20 elev 981.86 981.96 982.05 982.13 982.31 982.65 983.06 983.56
12.00 cfs 2.53 3.00 2.90 2.63 2.33 1.97 1.71 1.51
12.00 elev 984.16 984.41 984.35 984.21 984.06 983.91 983.77 983.65
12.80 cfs 1.33 1.15 0.97 0.81 0.67 0.56 0.47 0.40
12.80 elev 983.54 983.46 983.38 983.33 983.29 983.26 983.24 983.23
13.60 cfs 0.35 0.32 0.29 0.28 0.26 0.25 0.24 0.23
13.60 elev 983.22 983.22 983.22 983.22 983.21 983.21 983.21 983.21
14.40 cfs 0.21 0.20 0.19 0.17 0.17 0.17 0.17 0.17

14.40 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
15.20 cfs 0.17 0.17 0.15 0.14 0.14 0.14 0.14 0.14
15.20 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
16.00 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.13 0.11
16.00 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
16.80 cfs 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11
16.80 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
17.60 cfs 0.11 0.11 0.11 0.09 0.08 0.08 0.08 0.08
17.60 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
18.40 cfs 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.08
18.40 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
19.20 cfs 0.08 0.08 0.08 0.08 0.08 0.08 0.08 0.06
19.20 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
20.00 cfs 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.03
20.00 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
20.80 cfs 0.02 0.00
20.80 elev 983.20 983.20
985
98,
m
cn 98
98• /
Stage-Storage Curve -
981
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Storage(CF)
Stage-Storage Curve

985
98, /
in 98
98• /
/ Stage-Area Curve —
981
0 1000 2000 3000 4000 5000
Area(Sq.F)
Stage-Area Curve
985
98,
I98
98•
Stage-Discharge Curve —
981
0 5 10 15 20 25
Discharge(CFS)
Stage-Discharge Curve

985
Water Elevation Curve —
98A
98
98•
981
0 5 10 15 20 25
Time(hour)
Water Elevation Curve
8
Inflow Hydrograph —
7 Outflow Hydrograph —
6
5
U
O
U- 4
3
)1
1
0
0 5 10 15 20 25
Time(hour)
Inflow vs. Outflow Hydrograph

HydroNet Report
Design Settings
Runoff Method: SCS TR-20
Pond Routing Method: Stor-Ind
Reach Routing Method: Stor-Ind
Start Time(hr): 0.00
End Time(hr): 24.00
Time Increment(hr): 0.10
Rainfall Event
Name Storm Type Storm Duration(hr) Rain Depth(in) AMC
100-YR TYPE II 24-HOUR 24 8.37 II
Outflow Result - 1 P
Peak Time 12.00 hrs
Peak Discharge(Qp) 13.23 cfs
Runoff Volume 0.62 acre-ft
Outflow Result - 1S
Peak Time 12.10 hrs
Peak Discharge(Qp) 6.92 cfs
Runoff Volume 0.46 acre-ft
Subcatchment - 1S
Name: PRE-BASIN
Area(sf) CN Soil Group Description
64033 61 B Open Space-Good (>75%grass)
Total Area: 64033
Weighted CN: 61
Tc Calculation Method:TR-55
Tc Length Slope Velocity Description
(min) (ft) (%) (fps)
9.39 100.00 4.50 Sheet Flow
2.36 175.00 3.15 1.24 Shallow Flow
Total Tc(min): 11.75
----Runoff Hydrograph----
Peak Time 12.10 hrs
Peak Discharge(Qp) 6.92 cfs
Runoff Volume 0.46 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
9.60 cfs 0.01 0.02 0.02 0.02 0.02 0.03 0.03 0.04
10.40 cfs 0.05 0.06 0.06 0.08 0.09 0.11 0.13 0.15
11.20 cfs 0.18 0.20 0.24 0.28 0.36 0.93 1.54 2.76
12.00 cfs 5.42 6.92 4.70 2.40 1.60 1.15 0.98 0.87
12.80 cfs 0.80 0.75 0.67 0.63 0.57 0.54 0.51 0.47
13.60 cfs 0.46 0.42 0.40 0.38 0.36 0.36 0.34 0.33
14.40 cfs 0.32 0.30 0.29 0.27 0.26 0.25 0.25 0.25
15.20 cfs 0.25 0.25 0.25 0.23 0.22 0.22 0.22 0.22
16.00 cfs 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.20
16.80 cfs 0.19 0.19 0.18 0.18 0.18 0.19 0.19 0.19
17.60 cfs 0.19 0.19 0.19 0.18 0.16 0.15 0.15 0.15
18.40 cfs 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15
19.20 cfs 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.14
20.00 cfs 0.12 0.12 0.11 0.11 0.11 0.11 0.11 0.10
20.80 cfs 0.08 0.07 0.05 0.05 0.13 0.20 0.20 0.14
21.60 cfs 0.12 0.12 0.11 0.11 0.11 0.11 0.11 0.11
22.40 cfs 0.11 0.11 0.11 0.11 0.11 0.11 0.11 0.11
23.20 cfs 0.11 0.11 0.11 0.12 0.12 0.12 0.12 0.11
24.00 cfs 0.09
7
Runoff Hydrograph -
6
5
4_
u_
3
2
1
0 5 10 15 20 25
Time(hour)
Runoff Hydrograph

Subcatchment -2S
Name: POST-BASIN
Outflow Connection: 1P
Area(sf) CN Soil Group Description
26136 61 B Open Space-Good (>75%grass)
37897 98 B Paved Lots Roofs&Driveways
Total Area: 64033
Weighted CN: 83
Tc Calculation Method: Direct Entry
Tc(min): 5.00
Total Tc(min): 5.00
----Runoff Hydrograph----
Peak Time 12.00 hrs
Peak Discharge(Qp) 12.21 cfs
Runoff Volume 0.76 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.02 0.01 0.01
4.80 cfs 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03
5.60 cfs 0.03 0.03 0.04 0.04 0.04 0.05 0.05 0.06
6.40 cfs 0.06 0.06 0.07 0.07 0.07 0.07 0.08 0.08
7.20 cfs 0.08 0.08 0.08 0.09 0.09 0.09 0.09 0.09
8.00 cfs 0.10 0.11 0.12 0.13 0.15 0.15 0.15 0.16
8.80 cfs 0.16 0.16 0.17 0.19 0.20 0.20 0.20 0.21
9.60 cfs 0.23 0.24 0.25 0.25 0.25 0.28 0.29 0.30
10.40 cfs 0.35 0.36 0.43 0.47 0.49 0.58 0.59 0.67
11.20 cfs 0.72 0.74 0.91 0.94 2.87 3.97 4.75 11.16
12.00 cfs 12.21 5.55 2.19 1.96 1.34 1.29 1.14 1.07
12.80 cfs 1.05 0.85 0.84 0.74 0.70 0.69 0.61 0.61
13.60 cfs 0.54 0.51 0.51 0.47 0.47 0.44 0.42 0.42
14.40 cfs 0.38 0.37 0.34 0.33 0.33 0.33 0.33 0.33
15.20 cfs 0.33 0.32 0.29 0.28 0.28 0.28 0.28 0.28
16.00 cfs 0.28 0.28 0.28 0.28 0.28 0.28 0.25 0.24
16.80 cfs 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24
17.60 cfs 0.24 0.24 0.23 0.19 0.19 0.19 0.19 0.19
18.40 cfs 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19
19.20 cfs 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.15
20.00 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.11 0.10
20.80 cfs 0.09 0.05 0.05 0.20 0.28 0.27 0.15 0.14

21.60 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.14 0.14
22.40 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.14 0.14
23.20 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.14 0.10
24.00 cfs 0.10
15.0
Runoff Hydrograph -
12.5
10.0_
U
O
LI 7.5
5.0
2.5
0.0 _ i
0 5 10 15 20 25
Time(hour)
Runoff Hydrograph
Pond - 1 P
Pond- 1P
Inflow Connection: 2S
Inflow Area: 64033 sf
Stage-Storage Data
Elev(Ft) Storage(CF) Storage(Gallon) Storage(CY) Storage(Acre-Ft) Area(SF) Area(Acre)
981.000 0.000 0.000 0.000 0.000 832.270 0.019
982.000 1203.705 9004.338 44.582 0.028 1575.140 0.036
983.000 3184.760 23823.658 117.954 0.073 2386.970 0.055
984.000 6012.840 44979.165 222.698 0.138 3269.190 0.075
985.000 9754.195 72966.443 361.266 0.224 4213.520 0.097
Outlet(s)
Outlet#1:02,Orifice
Shape: Rectangular
Rise: 8.0 in
Width: 12.0 in
Invert Elevation: 983.200 ft
Coefficient: 0.60
Number of Openings: 1
Peak: Elev(ft) Discharge(cfs)
985.000 3.89
Outlet#2:03,Weir
Shape: Sharp-Crested Rectangular Weir w/o Contracted End
Crest Length: 16.000 ft
Invert Elevation: 984.500 ft
Coefficient: 3.33
Number of Openings: 1

Peak: Elev(ft) Discharge(cfs)
985.000 18.84
Outlet#3:01,Exfiltration
Area Type: Pond Bottom Area
Exfiltration Velocity: 2.00 in/hr
Invert Elevation: 981.000 ft
Exfiltration Discharge: 0.04 cfs
Peak: Elev(ft) Discharge(cfs)
985.000 0.04
----Inflow Hydrograph----
Peak Time 12.00 hrs
Peak Discharge(Qp) 12.21 cfs
Runoff Volume 0.76 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.02 0.01 0.01
4.80 cfs 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03
5.60 cfs 0.03 0.03 0.04 0.04 0.04 0.05 0.05 0.06
6.40 cfs 0.06 0.06 0.07 0.07 0.07 0.07 0.08 0.08
7.20 cfs 0.08 0.08 0.08 0.09 0.09 0.09 0.09 0.09
8.00 cfs 0.10 0.11 0.12 0.13 0.15 0.15 0.15 0.16
8.80 cfs 0.16 0.16 0.17 0.19 0.20 0.20 0.20 0.21
9.60 cfs 0.23 0.24 0.25 0.25 0.25 0.28 0.29 0.30
10.40 cfs 0.35 0.36 0.43 0.47 0.49 0.58 0.59 0.67
11.20 cfs 0.72 0.74 0.91 0.94 2.87 3.97 4.75 11.16
12.00 cfs 12.21 5.55 2.19 1.96 1.34 1.29 1.14 1.07
12.80 cfs 1.05 0.85 0.84 0.74 0.70 0.69 0.61 0.61
13.60 cfs 0.54 0.51 0.51 0.47 0.47 0.44 0.42 0.42
14.40 cfs 0.38 0.37 0.34 0.33 0.33 0.33 0.33 0.33
15.20 cfs 0.33 0.32 0.29 0.28 0.28 0.28 0.28 0.28
16.00 cfs 0.28 0.28 0.28 0.28 0.28 0.28 0.25 0.24
16.80 cfs 0.24 0.24 0.24 0.24 0.24 0.24 0.24 0.24
17.60 cfs 0.24 0.24 0.23 0.19 0.19 0.19 0.19 0.19
18.40 cfs 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.19
19.20 cfs 0.19 0.19 0.19 0.19 0.19 0.19 0.19 0.15
20.00 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.11 0.10
20.80 cfs 0.09 0.05 0.05 0.20 0.28 0.27 0.15 0.14
21.60 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.14 0.14
22.40 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.14 0.14
23.20 cfs 0.14 0.14 0.14 0.14 0.14 0.14 0.14 0.10

24.00 cfs 0.10
----Outflow Hydrograph----
Peak Time 12.00 hrs
Peak Discharge(Qp) 13.23 cfs
Peak Elevation 984.819 ft
Runoff Volume 0.62 acre-ft
hrs Main Time Increment=0.10 hr
0.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
0.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.80 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
1.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.60 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
2.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
2.40 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
3.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
3.20 elev 981.00 981.01 981.00 981.01 981.00 981.01 981.00 981.01
4.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 elev 981.00 981.01 981.00 981.01 981.00 981.00 981.00 981.00
4.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.80 elev 981.00 981.00 981.00 981.00 981.00 981.00 981.00 981.00
5.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
5.60 elev 981.00 981.00 981.00 981.00 981.00 981.00 981.00 981.01
6.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
6.40 elev 981.02 981.02 981.03 981.04 981.05 981.06 981.07 981.08
7.20 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
7.20 elev 981.09 981.11 981.12 981.13 981.15 981.16 981.18 981.19
8.00 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.00 elev 981.21 981.23 981.25 981.28 981.31 981.34 981.38 981.41
8.80 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
8.80 elev 981.45 981.48 981.52 981.56 981.61 981.66 981.70 981.75
9.60 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
9.60 elev 981.81 981.87 981.93 981.99 982.03 982.07 982.12 982.17
10.40 cfs 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10.40 elev 982.22 982.28 982.34 982.42 982.50 982.59 982.68 982.79
11.20 cfs 0.00 0.00 0.00 0.31 0.95 1.52 2.11 3.13
11.20 elev 982.91 983.03 983.13 983.22 983.38 983.65 983.97 984.49
12.00 cfs 13.23 7.40 3.41 3.01 2.79 2.53 2.28 1.98
12.00 elev 984.82 984.68 984.53 984.41 984.29 984.16 984.04 983.91
12.80 cfs 1.77 1.61 1.46 1.31 1.16 1.03 0.91 0.80
12.80 elev 983.81 983.71 983.61 983.53 983.46 983.41 983.36 983.32
13.60 cfs 0.71 0.62 0.56 0.51 0.47 0.44 0.41 0.39
13.60 elev 983.30 983.27 983.26 983.25 983.24 983.24 983.23 983.23
14.40 cfs 0.37 0.35 0.33 0.31 0.29 0.29 0.29 0.29

14.40 elev 983.23 983.22 983.22 983.22 983.22 983.22 983.22 983.22
15.20 cfs 0.29 0.29 0.27 0.25 0.25 0.24 0.24 0.24
15.20 elev 983.22 983.22 983.21 983.21 983.21 983.21 983.21 983.21
16.00 cfs 0.24 0.24 0.24 0.24 0.24 0.24 0.23 0.20
16.00 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
16.80 cfs 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20
16.80 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
17.60 cfs 0.20 0.20 0.20 0.17 0.15 0.15 0.15 0.15
17.60 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
18.40 cfs 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.15
18.40 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
19.20 cfs 0.15 0.15 0.15 0.15 0.15 0.15 0.15 0.12
19.20 elev 983.21 983.21 983.21 983.21 983.21 983.21 983.21 983.21
20.00 cfs 0.10 0.10 0.10 0.10 0.10 0.10 0.09 0.06
20.00 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
20.80 cfs 0.05 0.03 0.01 0.10 0.22 0.24 0.17 0.10
20.80 elev 983.20 983.20 983.20 983.20 983.21 983.21 983.21 983.20
21.60 cfs 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10
21.60 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
22.40 cfs 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10
22.40 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
23.20 cfs 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.08
23.20 elev 983.20 983.20 983.20 983.20 983.20 983.20 983.20 983.20
24.00 cfs 0.06
24.00 elev 983.20
985
98,
m
cn 98
98• /
Stage-Storage Curve -
981
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
Storage(CF)
Stage-Storage Curve

985
98, /
in 98
98• /
/ Stage-Area Curve —
981
0 1000 2000 3000 4000 5000
Area(Sq.F)
Stage-Area Curve
985
98,
I98
98•
Stage-Discharge Curve —
981
0 5 10 15 20 25
Discharge(CFS)
Stage-Discharge Curve

985
Water Elevation Curve —
98A
m
w 98
98•
981
0 5 10 15 20 25
Time(hour)
Water Elevation Curve
15.0
Inflow Hydrograph —
Outflow Hydrograph —
12.5
10.0_
U
O
U- 7.5
5.0
2.5
0.0 _
0 5 10 15 20 25
Time(hour)
Inflow vs. Outflow Hydrograph

WiEtIFOOff
EN6INEERIN6
NAPA & MSUC - Pond I
Sand Filter Sizing Calculations 17-Apr-23
Sand Filter Media
Storage Required
Developed Area: 0.83 acres (or) 36,155 sf
Developed Area w/75%Reduction: 0.6225 (or) 27,116 sf
Volume Conversion: 27,116 sf x 0.083 ft (1.0"of depth)
= 2,251 cf required
Storage Provided
Ponds 1
Stage(ft) Surface Area(SF)
982.00 1,574
983.00 2,387
983.20 2,520
Total Average Surface Area: 2,160 sf
Total Average Depth: 1.20 ft
Provided Water Quality Volume: 2,592 cf
2,592 > 2,251 Therefore,storage is sufficient.
Engineering and Land Planning
209 Highway 544 Conway,SC 29526 Phone[phone]

Drainage Culvert Calculations
•
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Sewer Network Report - Pipe Mon Apr 17 10:56:51 2023
Sewer Network File: G:\Project\P\2022 Civil\MSUC - Forest City\6.
Design\Files\Storm\FC-Storm.sew
Ground Surface File: G:\Project\P\2022 Civil\MSUC - Forest City\6. Design\Files\Tins\FC-PROP.tin
Design Method: Peak Discharge Calculation
Hydro Method: SCS Method
Storm Type: TYPE II 24-HOUR
Rainfall Event: 25 Year 24-Hour
AMC Type: 2
Rain Depth: 6.65 in
Sewer Line From Upstream to Downstream
Pipe from A3 to A2, system A
Material: Concrete
Number of Barrels: 1
Section Type: Circular
Section Area: 1.23 sq.ft
Diameter: 15.00 in
Pipe Thickness: 0.00 in
Manning' s n: 0.013
Length: 69.44 ft
Actual Length: 65.44 ft
Slope Length: 69.44 ft
Slope Actual Length: 65.44 ft
Slope: 1.08
Full Flow: 6.71 cfs
Maximum Flow: 7.22 cfs
Total Flow: 0.65 cfs
Peak Time: 5.47 min
Travel Time: 0.47 min
Initial Travel Time: 0.33 min
Initial Flow Velocity: 3.46 fps
Full Flow Velocity: 5.47 fps
Invert Rim Elev Cover HGL EGL Flow Velocity
Elev(ft) (ft) (ft) (ft) (ft) Depth(in) (ft/s)
Downstream 985.25 988.25 1.75 985.57 985.68 3.79 2.66
Upstream 986.00 988.25 1.00 986.31 986.43 3.77 2.68
Pipe from A2 to Al, system A
Material: Concrete
Number of Barrels: 1
Section Type: Circular
Section Area: 1.77 sq.ft
Diameter: 18.00 in
Pipe Thickness: 0.00 in
Manning's n: 0.013
Length: 94.88 ft
Actual Length: 90.88 ft
Slope Length: 94.88 ft
Slope Actual Length: 90.88 ft
Slope: 1.05
Full Flow: 10.78 cfs
Maximum Flow: 11.60 cfs
Total Flow: 1.50 cfs
Peak Time: 6.21 min
Travel Time: 0.73 min
Initial Travel Time: 0.37 min
Initial Flow Velocity: 4.29 fps
Full Flow Velocity: 6.10 fps
Invert Rim Elev Cover HGL EGL Flow Velocity
Elev(ft) (ft) (ft) (ft) (ft) Depth(in) (ft/s)
Downstream 984.00 987.00 1.50 985.01 985.03 12.14 1.18
Upstream 985.00 988.25 1.75 985.46 985.62 5.51 3.27
Pipe from Al to AO, system A
Material: Concrete
Number of Barrels: 1
Section Type: Circular
Section Area: 1.77 sq.ft
Diameter: 18.00 in
Pipe Thickness: 0.00 in
Manning's n: 0.013
Length: 52.75 ft
Actual Length: 50.75 ft
Slope Length: 52.75 ft
Slope Actual Length: 50.75 ft
Slope: 0.95

Full Flow: 10.23 cfs
Maximum Flow: 11.00 cfs
Total Flow: 5.15 cfs
Peak Time: 6.40 min
Travel Time: 0.20 min
Initial Travel Time: 0.15 min
Initial Flow Velocity: 5.81 fps
Full Flow Velocity: 5.79 fps
Invert Rim Elev Cover HGL EGL Flow Velocity
Elev(ft) (ft) (ft) (ft) (ft) Depth(in) (ft/s)
Downstream 983.50 983.50 -1.50 984.50 984.76 12.00 4.12
Upstream 984.00 987.00 1.50 984.87 985.24 10.49 4.82
Pipe from B3 to B2, system B
Material: HDPE
Number of Barrels: 1
Section Type: Circular
Section Area: 0.79 sq.ft
Diameter: 12.00 in
Pipe Thickness: 0.00 in
Manning's n: 0.012
Length: 50.10 ft
Actual Length: 46.10 ft
Slope Length: 50.10 ft
Slope Actual Length: 46.11 ft
Slope: 1.00
Full Flow: 3.86 cfs
Maximum Flow: 4.15 cfs
Total Flow: 0.48 cfs
Peak Time: 5.44 min
Travel Time: 0.44 min
Initial Travel Time: 0.25 min
Initial Flow Velocity: 3.34 fps
Full Flow Velocity: 4.91 fps
Invert Rim Elev Cover HGL EGL Flow Velocity
Elev(ft) (ft) (ft) (ft) (ft) Depth(in) (ft/s)
Downstream 986.00 988.50 1.50 986.43 986.47 5.18 1.47
Upstream 986.50 988.50 1.00 986.79 986.89 3.43 2.57
Pipe from B2 to B1, system B
Material: HDPE
Number of Barrels: 1
Section Type: Circular
Section Area: 0.79 sq.ft
Diameter: 12.00 in
Pipe Thickness: 0.00 in
Manning's n: 0.012
Length: 77.00 ft
Actual Length: 73.00 ft
Slope Length: 77.00 ft
Slope Actual Length: 73.00 ft
Slope: 0.97
Full Flow: 3.81 cfs
Maximum Flow: 4.10 cfs
Total Flow: 0.88 cfs
Peak Time: 5.94 min
Travel Time: 0.50 min
Initial Travel Time: 0.33 min
Initial Flow Velocity: 3.94 fps
Full Flow Velocity: 4.85 fps
Invert Rim Elev Cover HGL EGL Flow Velocity
Elev(ft) (ft) (ft) (ft) (ft) Depth(in) (ft/s)
Downstream 985.25 987.50 1.25 985.72 985.81 5.67 2.41
Upstream 986.00 988.50 1.50 986.39 986.54 4.71 3.07
Pipe from B1 to Be, system B
Material: HDPE
Number of Barrels: 1
Section Type: Circular
Section Area: 0.79 sq.ft
Diameter: 12.00 in
Pipe Thickness: 0.00 in
Manning's n: 0.012
Length: 10.51 ft
Actual Length: 8.51 ft
Slope Length: 10.51 ft
Slope Actual Length: 8.52 ft
Slope: 2.38

Full Flow: 5.95 cfs
Maximum Flow: 6.40 cfs
Total Flow: 0.88 cfs
Peak Time: 5.98 min
Travel Time: 0.03 min
Initial Travel Time: 0.03 min
Initial Flow Velocity: 5.42 fps
Full Flow Velocity: 7.58 fps
Invert Rim Elev Cover HGL EGL Flow Velocity
Elev(ft) (ft) (ft) (ft) (ft) Depth(in) (ft/s)
Downstream 985.00 985.00 -1.00 985.26 985.72 3.11 5.42
Upstream 985.25 987.50 1.25 985.51 985.97 3.11 5.42