SW6191005_SW Narrative_20191218

CIVIL CALCULATIONS
SOTF D FAC
P N 89057
The civil calculations attached are for the storm water management and erosion
and sediment control analysis.
DEQ SWM PERMIT#SW6191005
REVISION 01 PERMIT SUBMITTAL: 18 DECEMBER 2019
ORIGINAL SUBMITTAL: 07 NOVEMBER 2019
Prepared by:
(, Stantec
Stantec Consulting Services
N CARO<i
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SE
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FN NE
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Inc. '�/1III I 1 W \0\7\2/96/2099
801 Jones Franklin Road, Suite 300
Raleigh, North Carolina, 27606
[phone] //Fax [phone]

TABLE OF CONTENTS
Stormwater Management Project Narrative.......................................................p.1
Mapof Drainage Area............................................................................................p.3
Soils & Hydrologic Soils Map.................................................................................p.4
Infiltration Basin #1- #3 1.0-Inch Water Quality Volume (DA to Device) ....... p.11
Project Area 1.0-Inch Volume & Summary Calculations.....................................p.12
Infiltration Basin #1- #3 Stage/storage & Surface Area......................................p.13
Infiltration Basin #1- #3 Draw Down Calculations...............................................p.14
Infiltration Basin #1- #3 Anti -Floatation Calculation...........................................p.15
TR-55 Curve Number Calculations.....................................................................p.16
Storm Drain Pipe Calculations & C Coefficients Calculations.............................p.19
Permanent Ditch, Liner, Riprap, and Riprap Outlet Calculations .......................p.22
Infiltration Basin #1 Routing Report......................................................................p.40
Infiltration Basin #2-3 Routing Report...................................................................p.66

Ft. Bragg, SOTF DFAC Project
Stormwater Management Narrative
The proposed project known as Fort Bragg SOTF DFAC project consists of a new
dining facility building addition, asphalt parking lot, concrete pavement, and stormwater
management infiltration basin #1 - #3 devices. This report presents the stormwater
management calculations for the project.
The property is located on Fort Bragg in Cumberland County, North Carolina with
access to the site from McKellars Road and Lamont Road. The SOTF DFAC project is
located in the Southwest section of the Security Operations Training Facility (SOTF)
compound. The existing partially developed site is situated north of the existing access
drive off of McKellars Road security checkpoint. The scope of work for the DFAC
project includes civil site work and site utilities design along with demolition of the
existing site to support the construction of the new SOTF DFAC project.
The project is located on a partially developed site primarily consisting of grass areas
with existing sidewalks at the dining facility addition site and a helicopter pad in the
area of the proposed parking lot. Existing asphalt parking lots border the proposed
parking lot site and existing asphalt roads and the existing dining facility border the
dining facility addition project site. The proposed site will disturb greater than 1.0 acre
and the built upon area will be greater than 24% of the site area, and is therefore
considered a high density project. The state of North Carolina's Stormwater
Management Phase II Post Construction ordinance requires new high density
development projects to provide stormwater management water quality treatment for
the first inch of runoff for the newly created impervious areas. This project is also
required to meet EISA Section 438 requirements which requires the post development
conditions to meet the pre development conditions for the 24-hour 95t" percentile
rainfall (approximately 1.8 inches at Ft. Bragg).
The site has been broken down into three drainage areas (one for each infiltration
basin) for the purposes of determining the required stormwater management volume
requirements for each infiltration basin with all bypass stormwater being accounted for
in the calculations. Infiltration basins #1 —#3 have been sized based upon the actual
drainage area it receives. The proposed dining facility building addition, sidewalks, and
existing asphalt roads impervious areas are treated in infiltration basin #1. The
proposed parking lot impervious areas are treated in infiltration basins #2 - #3.
Stormwater pretreatment measures consist of grass channels and vegetated filter
strips for infiltration basins #1 - #3. Water quality stormwater management is provided
in infiltration basins #1 - #3. Water quality control is provided for the 1.8-inch of runoff
and infiltration basins #1 - #3 provides 85% total suspended solids removal.
The analysis followed the Simple method and other generally accepted engineering
practices. The Simple method was used to calculate the required stormwater
management volume. The developed site will add nearly 35,000 sf of impervious area
and infiltration basins #1 - #3 will receive and treat approximately 48,417 sf of
Page 1

impervious areas, thus the volume associated with the newly created impervious areas
is being treated and accounted for. The required 1.0" required water quality
management volume, which does not reduce the required volume by taking into
account the pre -development existing site impervious area, is 3,513 cf and infiltration
basins #1 - #3 provides 9,243 cf of ponding and infiltration storage. The drainage
areas were delineated from field prepared topographic survey and supplemented by
GIS. Existing impervious area calculations were based on existing field surveys. Post
development impervious areas were based on the proposed site plan. A geotechnical
engineer performed four infiltration tests and seasonal high water table reading of the
existing soils within the limits of infiltration basins #1 - #3 and the infiltration rates were
found to be approximately 2.93 to 4.12 inches per hour with the seasonal high water
table to be at least 10-feet below existing ground elevations. To be more conservative,
the infiltration basins were designed using a slightly lower infiltration rate of either 2.5
or 3.0 inches/hour than the measured infiltration rates. The infiltration rates were
tested at the approximate bottom of infiltration basin #1 elevation of 295.75 and
elevation 297.25 for infiltration basins #2 - #3. Infiltration basins #1 — #3 have a
proposed ponding depth of 1.50-feet with an inlet structure to serve as the overflow to
bypass the larger storm events. The overflow inlet structure's grate is set at the
ponding depth elevation with adequate freeboard provided above the ponding depth
elevation. Infiltration basins #1 - #3 will be planted with sod. The water quality volume
requirements will be provided in the surface ponding volume and the infiltration through
the bottom of infiltration basins #1 - #3 that occurs during the infiltration basin initial
filling up with stormwater. The bottom of infiltration basins #1 - #3 is greater than 2.0'
feet above the seasonal high water elevation with the draw down within a maximum of
72 hours (see attached calculations). The design storm events were based on the
rainfall data from NRCS for Ft. Bragg, NC.
Page 2

FOR OFFICIAL USE ONLY Ri / � �� � � � r � 6 7
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/ 3 PROPOSED STORMWATER MANAGEMENT,/
/ SWM101 C-505 INFILTRATION BASIN #3
BOTTOM STORMWATER = 297.29'
/ PONDING = 298.75'
SD A
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181, CMP
3 PROPOSED STORMWATER MANAGEMENT
o- UTILITY DEMO LOD o a SY
SWWl0 C.505 INFILTRATION BASIN #2 0
BOTTOM STORMWATER = 297.25' EX. BUA TO REMAIN = 251 SF \ �oLCIO
PONDING = 298.75' r _ OFF -SITE TREATED = 108 SF \ /
0 \/
\ �✓ 05000 /
DGE OF SIDEWALK
300
rPONDING = 297.25
299
.?'7
298
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297
296
BASIN ELEV.=295.75
295
NOTE: REFER TO DETAIL 3 SHT C-505 AND
SHT CG103 FOR MORE INFORMATION
INFILTRATION BASIN #1 CROSS SECTION A -A
SCALE: 1"=10' (H)
1-5' (V)
DGE OF PARKING LOT TIE TO EXISTING PER PLAN
299.5
PARKING
-PONDING = 298.75 Q
� 300
299
298
BASIN ELEV.=297.25 297
2' PEA GRAVEL PER DETAIL NOTE: REFER TO DETAIL 3 SHT C-505 AND
\ SHT CG104 FOR MORE INFORMATION
INFILTRATION BASIN #2 CROSS SECTION B-B
SCALE: 1"=10' (H)
1"=5'(V)
N
ASPH aQ
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DI 400
TOP=300.2'
INV=297.7' 18" CMP
EX. PERMITTED OFFSITE BUA
TREATED=4,200 SF
BLDG 0190M
FFE=304.80
NrVv UUILUINO = aoss ar
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INV 294.2'
3
PROPOSED STORMWATER MANAGEMENT
/ SWM101 C-505
INFILTRATION BASIN #1
�� sy
BOTTOM STORMWATER = 295,75'
PONDING = 297.25'
LPL STORMWATER MANAGEMENT DRAINAGE AREA MAP
SWM101 SCALE: 1"=40'
SHEET NOTES: LEGEND
AREA STABALIZED WITH
VEGETATION = 49,223 SF
(1.13 ACRES)
PROJECT AREA FOR
BUA = 2.25 ACRES
PROJECT TOTAL DISTURBED
AREA = 2.25 ACRES
1. ERICH L HOFFMAN OF FORT BRAGG DPW -ENVIRONMENTAL MANAGEMENT LOD Lao LIMITS OF DISTURBANCE/LIMITS OF
CONSTRUCTION
BRANCH VISITED THE SITE AND DETERMINED THAT THERE ARE NO WETLANDS
WITHIN THE LIMITS OF DISTURBANCE OR WITHIN THE VICINITY OF THE vv w EXISTING WATER LINE
PROJECT AS SHOWN ON THIS PLAN.
EXISTING TREE LINE
EDGE OF PARKING LOT NEW TREE LINE
299.5 1 1 1 1 1 1 1 1 1 TIME OF CONCENTRATION FLOW PATH
LPONDING = 298.75 300
�e 299 EX. TIME OF CONCENTRATION
298
BASIN ELEV.=297.25 297 I— —I STORMWATER MANAGEMENT
2' PEA GRAVEL PER DETAIL INFILTRATION BASIN
NOTE: REFER TO DETAIL 3 SHT C-505 AND
SHT CG104 FOR MORE INFORMATION 1 SWM DRAINAGE AREA AND EZ-SCM#
DI SUB -DRAINAGE AREA
INFILTRATION BASIN #3 CROSS SECTION C-C 6
SCALE: 1"=10' (H) N NEW IMPERVIOUS AREA
1"=5' (V)
40' 0 40' 120'
1"=40'
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Soil Map —Cumberland County, North Carolina
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
BaD
Blaney loamy sand, 8 to 15
percent slopes
0.0
0.0%
CaB
Candor sand, 1 to 8 percent
slopes
11.4
100.0%
Totals for Area of Interest
11.4
100.0%
USDA Natural Resources Web Soil Survey 11/8/2018
Conservation Service National Cooperative Soil Survey Page 3 of 3
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Page 8

Hydrologic Soil Group —Cumberland County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
BaD
Blaney loamy sand, 8 to
15 percent slopes
C
0.0
0.0%
CaB
Candor sand, 1 to 8
percent slopes
A
11.4
100.0%
Totals for Area of Interest
11.4
100.0%
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
USDA Natural Resources Web Soil Survey 11/8/2018
Conservation Service National Cooperative Soil Survey Page 3 of 4
Page 9

Hydrologic Soil Group —Cumberland County, North Carolina
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
USDA Natural Resources Web Soil Survey 11/8/2018
Conservation Service National Cooperative Soil Survey Page 4 of 4
Page 10

12/13/2019
NCDEQ BMP Manual
INFILTRATION BASIN #1 - #3
1.0" Water Quality Volume (WQv)
(ACTUAL DRAINAGE AREA TO SWM DEVICE)
Rv = runoff coefficient (Runoff/Rainfall)
Rv = 0.05 + 0.009( 1 ) Where "I" = % Impervious
("Simple Method" - Schueler, 1987)
WQv = 1.0"RvA
12
Infiltration Basin #1
Fill in Values:
M103347
DA Impervious Area (Ex. & Prop.)
"1" = Percent Impervious of DA
"A" = DA (Acres)
Answer:
WQv = 0.050 Ac. Ft.
2,172 Cubic Feet Required
Infiltration Basin #2
Fill in Values:
0.266 DA Impervious Area (Ex. & Prop.)
"1" = 32.0791 Percent Impervious of DA
"A" = 0.82978 DA (Acres)
Answer:
WQv = 0.023 Ac. Ft.
1,020 Cubic Feet Required
Infiltration Basin #3
Fill in Values:
0.257 DA Impervious Area (Ex. & Prop.)
"1" = 62.7527 Percent Impervious of DA
"A" = 0.40999 DA (Acres)
Answer:
WQv = 0.021 Ac. Ft.
915 Cubic Feet Required
= 26 455 SF impervious area
A = Actual Drainage Area to SWM Device
Rv= 0.578888
WQv= 0.58 inches
CN(WQv)= 95.2 Use to comp. Q,--
= 11 595 SF impervious area
A = Actual Drainage Area to SWM Device
Rv= 0.338712
WQv= 0.34 inches
CN(WQv)= 90.5 Use to comp. Q,--
= 11 207 SF impervious area
A = Actual Drainage Area to SWM Device
Rv= 0.614774
WQv= 0.61 inches
CN(WQv)= 95.8 Use to comp. Q,--
Page 11

DRAINAGE AREA & IMPERVIOUS AREA
Pre -Development Impervious Area (Within Drainage Areas)
Infi lt #1
10,284 SF
I nfi It#2
2,586 SF
I nfi It #3
1,634 SF
Post Development Impervious Area (Prop. & Ex.) (Within Drainage Area)
Infi lt #1
26,455 SF
I nfi It #2
11,595 SF
I nfi It #3
11,207 SF
Project Limit of Disturbance (Using as Project Area)
LOD
98, 010 SF
Pre -Development Impervious Area (Within LOD)
LOD
11,677 SF
Post Development Impervious Area (Prop. & Ex.) (Within LOD)
LOD
35,838 SF
1.0" Volume For Project Area (LOD) Using Simple Method
Per Runoff Volume Simple Method NCDEQ Stormwater BMP Manual
PRE -DEVELOPMENT
RvPRF = 0.05 + 0.9 * IA
IA _ Existing Site Impervious Area
Total Area (Project Area)
A= 11,677
98,010
IA= 0.12
RvPRF = 0.16
POST DEVELOPMENT
RvPosT = 0.05 + 0.9 * IA
Developed Site Impervious Area (Prop. & Ex.)
IA_ Total Area (Project Area)
35,838
A=
98,010
IA= 0.37
RvPosT = 0.38
�rvious area for the Project =
24,161 SFjmd
1.0" VOLUME REQUIRED For Project Area (LOD) Using Simple Method
Simple Method
V = 3630 * P * (RvPOST - RvPRF) * DA
P (1.0") = 1 IN
DA= 98,010 SF
DA = 2.25 AC
V = 1,812 CF = VOLUME REQUIRED FOR PROJECT AREA USING SIMPLE METHOD (FACTORS IN PRE -CONDITIONS IMPERVIOUS AREA)
V = 3,096 CF = VOLUME REQUIRED FOR PROJECT AREA USING SIMPLE METHOD (DOES NOT FACTOR IN PRE -CONDITIONS IMP. AREA, REMOVES Rvpre FROM EQUATION)
STORMWATER VOLUME SUMMARY CALCULATIONS
SURFACE
VOLUME @ PONDING
**INFILTRATION
*VOLUME
**APPROX.
TOP OF
TOP OF
IMPERVIOUS
INFILTRATION
AREA @
DEPTH OF
(TOP OF OVERFLOW
PROVIDED BY
TOTAL
SHWT
BOTTOM
OVERFLOW
EMBANKMENT
AREA
BASIN #
BOTTOM
PONDING
INLET)
RATE
INFILTRATION
VOLUME
ELEVATION
OF BASIN
INLET
PONDING
TREATING
(SF)
(FT)
CF
(IN/HR)
CF
CF
FT
FT
FT
FT
SF
1
1,535
1.50
3,519
3.00
768
4,287
287.00
295.75
297.25
298.35
26,455
2
1,165
1.50
2,381
2.50
485
2,867
290.50
297.25
298.75
299.50
11,595
3
785
1.50
1,697
3.00
393
2,089
288.00
297.25
298.75
299.50
11,207
*Adjustment to the total volume provided to account for the volume of water which exfiltrates out
the bottom of the infiltration basin during the period of time required to fill the infiltration basin is as follows:
Volume = Infiltration Rate (ft/hr) * Filling Time (hrs.) * Surface Area of infiltration basin
Use Filling Time = 2 hours
** Based on observation from the geotechnical engineer
SHWT = Seasonal High Water Table
Impervious Area Treating
49,257 sf
Newly created Impervious Area
24,161 sf
1.0" Water Quality Volume Required, Prolect Area (LOD) (Simple Method, Pre -Development Conditions Considered)
1,812 cf
1.0" Water Quality Volume Required, Prolect Area (LOD) (Simple Method, Pre -Development Conditions NOT Considered)
3,096 cf
1.0" Water Quality Volume Required, Drainage Areas Only (Simple Method, Pre -Development Conditions NOT Considered)
4,107 cf
1.0" Water Quality Volume Provided
9,243 cf
Page 12

Infiltration Basin #1
ELEVATION AREA
AREA
STORAGE
CUMULATIVE
(FT) (SF)
(Acres)
(CU FT)
(CU FT)
295.75 1k35.00
0.035
0.00
0.00
296.0 1,790.00
0.041
415.63
415.63
297.0 2,900.00
0.067
2,345.00
2,760.63
297.25 3,170.00
0.073
758.7566.,
3,519.38
298.0 4,000.00
0.092
2,688.75
6,208.13
298.35 4,400.00
0.101
1,470.00
7,678.13
DV
SA =
(K/12/FS*T)
DV=
2,171.70 cu ft
K=
3.00 in/hr
FS=
2
T=
72 hrs
Min. Surface Area (SA) =
241
(per design
Surface Area Provided =
1,535
Infiltration Basin #2
ELEVATION AREA
AREA
STORAGE
CUMULATIVE
(FT) (SF)
(Acres)
(CU FT)
(CU FT)
297.25 1,165.00
0.027
0.00
0.00
298.0 1,590.00
0.037
1,033.13
1,033.13
298.75 2,005.00
0.046
1,348.13_,381.25
299.00 2,284.00
0.052
536.13
2,917.38
299.5 2,620.00
0.060
1,226.00
4,143.38
DV
SA =
(K/12/FS*T)
DV=
1,020.23 cu ft
K=
2.50 in/hr
FS=
2
T=
72 hrs
Min. Surface Area (SA) =
136
(per design
Surface Area Provided =
1,165
Infiltration Basin #3
ELEVATION AREA
AREA
STORAGE
CUMULATIVE
(FT) (SF)
(Acres)
(CU FT)
(CU FT)
297.25 785.00
0.018
0.00 0.00
298.0 1,100.00
0.025
706.88 706.88
298.75 1,540.00
0.035
990.00
299.00 1,715.00
0.039
406.88 2,103.75
299.5 2,080.00
0.048
948.75 3,052.50
SA = DV
(K/12/FS*T)
DV= 914.94 cu ft
K= 3.00 in/hr
FS= 2
T= 72 hrs
Min. Surface Area (SA)
I 102 (per design
Surface Area Provided
785
Page 13

Draw Down Time:
Infiltration Basin #1
Design Volume
2,172 cu.ft.
Infiltration Bottom Area:
1,535 sq ft.
Maximum Release Time:
72 hrs
Overflow Inlet Grate Elev:
297.25
Bottom of Basin:
1 295.75
Infiltration Rate:
3.00 in/hr
Factor of Safety (FS):
1 2.00
Bottom of Infiltration Basin Elev:
295.75
Draw Down Time for only Infiltration with FS: F 11 hrs
Infiltration Basin #2
Design Volume
1,020 cu.ft.
Infiltration Bottom Area:
1,165 sq ft.
Maximum Release Time:
72 hrs
Overflow Inlet Grate Elev:
298.75
Bottom of Basin:
1 297.25
Infiltration Rate:
2.50 in/hr
Factor of Safety (FS):
1 2.00
Bottom of Infiltration Basin Elev:
297.25
Draw Down Time for only Infiltration with FS: ®hrs
Infiltration Basin #3
Design Volume
915 cu.ft.
Infiltration Bottom Area:
785 sq ft.
Maximum Release Time:
72 hrs
Overflow Inlet Grate Elev:
298.75
Bottom of Basin:
1 297.25
Infiltration Rate:
3.00 in/hr
Factor of Safety (FS):
1 2.00
Bottom of Infiltration Basin Elev:
297.25
Draw Down Time for only Infiltration with FS: 0hrs
M
OK
Page 14

ANTI -FLOTATION DEVICE CALCULATIONS
Infilt Basin 91
Infilt Basin 92
Infilt Basin 93
LENGTH OF RISER (LR)
FT
4.00
4.00
4.00
WIDTH OF RISER (WR)
FT
3.00
3.00
3.00
HEIGHT OF WATER (Hw)
FT
1.50
1.50
1.50
HEIGHT OF RISER (HR)
FT
2.85
2.25
3.15
AREA OR RISER (AR)
SF
12.00
12.00
12.00
WEIGHT OF WATER (Ww)
LB/CF
62.4
62.4
62.4
RISER UPLIFT (Wu) = Ar*Hw*Ww
LB
1123.20
1123.20
1123.20
FACTOR OF SAFETY(Fs)
1.10
1.10
1.10
UNIT WEIGHT OF CONCRETE (Uc)
LB/CF
150.00
150.00
150.00
VOLUME NEEDED (VN) = (WU+Fg�UC
CF
8.24
8.24
8.24
VOLUME OF 15" or 18" DIA OUTFALL PIPES
CF
0.88
0.61
1.23
WALL THICKNESS (TW)
FT
0.50
0.50
0.50
VOLUME OF WALLS (VW)
CF
16.22
12.89
17.67
LENGTH OF PAD (L)
FT
4.00
�.uu
�.uu
WIDTH OF PAD (W)
FT
3.00
3.00
3.00
HEIGHT OF PAD (H)
FT
0.50
0.50
0.50
VOLUME OF PAD (VP)
CF
6.00
6.00
6.00
PAD=BOTTOM OF STD INLET
VW+VP
CF
22.22
18.89
23.67
VW+VP>VN
YES
YES
YES
Page 15

J Sesler SOTF DFAC
Infiltration Basin #1
Cumberland NOAA County, North Carolina
Storm Data
Rainfall Depth by Rainfall Return Period
2-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr
(in) (in) (in) (in) (in) (in)
---------------------------------------------------------------------
3.7 4.7 5.4 6.5 7.3 8.2
Storm Data Source:
Rainfall Distribution Type:
Dimensionless Unit Hydrograph
WinTR-55, Version 1.00.10
User -provided custom storm data
Type III
<standard>
Page 1
5/6/2019 2:44:05 PM
Page 16

J Sesler
SOTF DFAC
Infiltration Basin #1
Cumberland NOAA County, North Carolina
Sub -Area Summary
Table
Sub -Area
Drainage Time of Curve
Receiving
Identifier
Area Concentration Number
Reach
(ac) (hr)
----------------------------------------------------------
Basin #1
.94 0.100 70
Outlet
Basin #2
.83 0.100 58
Outlet
Basin #3
.41 0.100 76
Outlet
Total Area:
2.18 (ac)
Sub -Area
Description
WinTR-55, Version 1.00.10 Page 1 5/6/2019 2:45:27 PM
Page 17

J Sesler SOTF DFAC
Infiltration Basin #1
Cumberland NOAA County, North Carolina
Sub -Area Land Use and Curve Number Details
Sub -Area
Hydrologic
Sub -Area
Curve
Identifier
Land Use
Soil
Area
Number
--------------------------------------------------------------------------------
Group
(ac)
Basin #1
Open
space; grass cover > 750
(good)
A
.45
39
Paved
parking lots, roofs, driveways
A
.49
98
Total
Area / Weighted Curve Number
.94
70
Basin #2
Open
space; grass cover > 750
(good)
A
.56
39
Paved
parking lots, roofs, driveways
A
.27
98
Total
Area / Weighted Curve Number
.83
58
Basin #3
Open
space; grass cover > 750
(good)
A
.15
39
Paved
parking lots, roofs, driveways
A
.26
98
Total
Area / Weighted Curve Number
.41
76
WinTR-55, Version 1.00.10 Page 1
5/6/2019 2:46:17 PM
Page 18

STORM DRAINAGE SCHEDULE
SOF DFAC
12/13/2019 4:49 PM
Designed By:JS
JSS
Project #:
SOF DFAC
Checked By:JSS
JSS
Date:
13-Dec-19
Tc
T,
lino
110
C,
Q10
Q10
Q10
Actual
Upstream
Downstream
Upstream Structure
From
To
Inlet
Total
Inlet
Pipe
Pipe
Pipe
Inlet
omposit
Side-
Cumulative
Total
Slope
alculatec
Pipe
Actual
Velocity
Length
Segment
Invert
Invert
Pipe
Rim
Minimum
Minimum
(upstream)
downstreaml
Area
Area
-ime of Con
Travel TiMETime
of Con
Intensity
Intensity
Runoff
Stream
E;ide-StrearrDischarge
Diameter
Diameter
Velocity
Full
I Time
(From)
(To)
Material
Elevation
Depth
Cover
(Acres)
(Acres)
(Min)
(Min)
(Min)
(In/Hr)
(In/Hr)
oefficien
(cfs)
(cfs)
(cfs)
(Ft/Ft)
(In)
(In)
(fps)
(fps)
(Ft)
(Min)
(Ft)
(Ft)
(Ft)
(Ft)
(FT)
ES-15
ES-14
0.04
0.04
5.00
0.00
5.00
7.91
7.91
0.63
0.00
0.20
0.0100
3.69
4
2.71
2.4
15.00
0.09
299.25
299.10
PVC
300.25
1.00
0.58
**DI-13
DI-12
0.83
0.83
5.00
0.00
5.00
7.91
7.91
0.51
0.00
0.00
0.0050
0.62
15
0.01
4.0
161.00
206.34
296.50
295.70
CLASS IV RCP
298.75
2.25
0.81
***DI-12
FES-11
0.37
1.24
5.00
206.34
211.34
7.91
0.00
0.72
0.20
0.37
0.0050
5.67
15
2.37
4.0
29.00
0.20
295.60
295.45
CLASS IV RCP
298.75
3.06
1.72
RCO-7
DI-6
0.13
0.13
5.00
0.00
5.00
7.91
7.91
0.95
0.00
0.98
0.0310
5.41
6
6.23
5.4
27.00
0.07
299.00
298.16
PVC
302.50
3.60
2.92
DI-6
ES-5
0.05
0.18
5.00
0.07
5.07
7.91
7.91
0.46
0.00
1.16
0.0310
5.77
8
6.53
6.6
44.00
0.11
298.16
296.80
PVC
300.00
1.84
1.09
RCO-4
ES-3
0.09
0.09
5.00
0.00
5.00
7.91
7.91
0.95
0.00
0.68
0.0410
4.47
6
6.34
6.3
11.00
0.03
297.25
296.80
PVC
300.00
2.75
2.17
ES-9
ES-8
0.22
0.22
5.00
0.00
5.00
7.91
7.91
0.45
0.00
0.78
0.0650
4.33
8
7.86
9.5
27.00
0.06
297.50
295.75
PVC
299.25
1.75
1.00
*DI-2
EX HW-1
0.44
0.93
5.00
0.00
5.00
7.91
7.91
0.61
2.62
1.09
0.0039
11.57
18
2.99
4.0
52.00
0.29
294.40
294.20
EX. CMP
297.25
2.85
1.14
Notes:
Design for the 10-year storm assumes the Time of
CB
- Catch Basin
Concentration to an individual Culvert/Inlet = 5 minutes.
Cl
- Curb Inlet
DCI
- Double Curb Inlet
Actual Velocity is calculated based upon percentage
DDI
- Double Drop Inlet
of Full -Flowing pipe and actual depth of flow from
DI
- Drop Inlet
Hydraulic elements.
DIS
- Drop Inlet, Slab top
RCP
CMID
PVC
HDPE
EX DI
- Existing Drop Inlet
Manning's "n" Factor=
0.012
0.024
0.01
0.012
JB
-Junction Box
Runoff Coefficients
MH
- Manhole
for Rational Method: C = 0.30 (grass), C = 0.95 (pavt.), C=0.50 (single farr
S
- Detention Structure
EW
- End Wall
FES
- Flared End Section
IDS
- Downspout
ES
- End Section
Notes:
* Pond Pack 10-Year Discharge from Infiltration
Basin #1 = 1.09 cfs
** Pond Pack 10-Year Discharge from Infiltration Basin #2 = 0.00 cfs
Worksheet in C-601.dwg
Page 19

C Coefficient and Discharge Calculations - Permanent Ditches and Storm Drainage
System III
DA = 0.44
0.21 Impervious (Ac)
0.23
Grass (Ac) 0.30
0.610
6.16 Q(2)= 1.65
7.91 Q(10)= 2.12
DI-6
0.05 (Ac)
C Coef.
DA =
0.01 Impervious (Ac)
0.04
DA =
0.01 Impervious (Ac)
0.04
0.95
Grass (Ac)
0.30
DA =
0.05 Impervious (Ac) 0.95
0.17
C=
1 2year=
110vear=
Grass (Ac)
Grass (Ac)
0.30
DA =
0.27 Impervious (Ac) 0.95
0.56 Grass (Ac) 0.30
C= 0.511
1 2year= 6.16 Q(2)= 2.61
1 10year= 7.91 Q(10)= 3.36
Grass Ditch (D#1/TD#1)
DA = 0.13 (Ac)
C Coef.
0.08 Impervious (Ac) 0.95
0.05 Grass (Ac) 0.30
C= 0.700
1 2year= 6.16 Q(2)= 0.56
1 10year= 7.91 Q(10)= 0.72
Grass Ditch (D#3/TD#3)
DA = 0.06 (Ac)
C Coef.
0.04 Impervious (Ac) 0.95
0.02 Grass (Ac) 0.30
C= 0.733
1 2year= 6.16 Q(2)= 0.27
1 10year= 7.91 Q(10)= 0.35
)A = 0.09
0.09 Impervious (Ac)
0.00 Grass (Ac)
RCO-7
DA = 0.13 (Ac)
C Coef.
0.13 Impervious (Ac) 0.95
0.00 Grass (Ac) 0.30
C= 0.950
12year= 6.16 Q(2)= 0.76
110vear= 7.91 Q(10)= 0.98
DI-12
DA = 0.37 (Ac)
C Coef.
0.24 Impervious (Ac) 0.95
0.13 Grass (Ac) 0.30
C= 0.722
1 2year= 6.16 Q(2)= 1.64
110vear= 7.91 Q(10)= 2.11
ES-15
DA = 0.04 (Ac)
C Coef.
0.02 Impervious (Ac) 0.95
0.02 Grass (Ac) 0.30
C= 0.625
1 2year= 6.16 Q(2)= 0.15
1 10year= 7.91 Q(10)= 0.20
Grass Ditch (D#2/TD#2)
DA = 0.16 (Ac)
C Coef.
0.12 Impervious (Ac) 0.95
0.04 Grass (Ac) 0.30
C= 0.788
1 2year= 6.16 Q(2)= 0.78
1 10year= 7.91 Q(10)= 1.06
Grass Ditch (D#4/TD#4)
DA = 0.52 (Ac)
C Coef.
0.13 Impervious (Ac) 0.95
0.39 Grass (Ac) 0.30
C= 0.463
1 2year= 6.16 Q(2)= 1.48
1 10year= 7.91 Q(10)= 1.96
Page 20
)A = 0.09
0.09 Impervious (Ac)
0.00 Grass (Ac)
RCO-7
DA = 0.13 (Ac)
C Coef.
0.13 Impervious (Ac) 0.95
0.00 Grass (Ac) 0.30
C= 0.950
12year= 6.16 Q(2)= 0.76
110vear= 7.91 Q(10)= 0.98
DI-12
DA = 0.37 (Ac)
C Coef.
0.24 Impervious (Ac) 0.95
0.13 Grass (Ac) 0.30
C= 0.722
1 2year= 6.16 Q(2)= 1.64
110vear= 7.91 Q(10)= 2.11
ES-15
DA = 0.04 (Ac)
C Coef.
0.02 Impervious (Ac) 0.95
0.02 Grass (Ac) 0.30
C= 0.625
1 2year= 6.16 Q(2)= 0.15
1 10year= 7.91 Q(10)= 0.20
Grass Ditch (D#2/TD#2)
DA = 0.16 (Ac)
C Coef.
0.12 Impervious (Ac) 0.95
0.04 Grass (Ac) 0.30
C= 0.788
1 2year= 6.16 Q(2)= 0.78
1 10year= 7.91 Q(10)= 1.06
Grass Ditch (D#4/TD#4)
DA = 0.52 (Ac)
C Coef.
0.13 Impervious (Ac) 0.95
0.39 Grass (Ac) 0.30
C= 0.463
1 2year= 6.16 Q(2)= 1.48
1 10year= 7.91 Q(10)= 1.96
Page 20
DI-12
DA = 0.37 (Ac)
C Coef.
0.24 Impervious (Ac) 0.95
0.13 Grass (Ac) 0.30
C= 0.722
1 2year= 6.16 Q(2)= 1.64
110vear= 7.91 Q(10)= 2.11
ES-15
DA = 0.04 (Ac)
C Coef.
0.02 Impervious (Ac) 0.95
0.02 Grass (Ac) 0.30
C= 0.625
1 2year= 6.16 Q(2)= 0.15
1 10year= 7.91 Q(10)= 0.20
Grass Ditch (D#2/TD#2)
DA = 0.16 (Ac)
C Coef.
0.12 Impervious (Ac) 0.95
0.04 Grass (Ac) 0.30
C= 0.788
1 2year= 6.16 Q(2)= 0.78
1 10year= 7.91 Q(10)= 1.06
Grass Ditch (D#4/TD#4)
DA = 0.52 (Ac)
C Coef.
0.13 Impervious (Ac) 0.95
0.39 Grass (Ac) 0.30
C= 0.463
1 2year= 6.16 Q(2)= 1.48
1 10year= 7.91 Q(10)= 1.96
Page 20
ES-15
DA = 0.04 (Ac)
C Coef.
0.02 Impervious (Ac) 0.95
0.02 Grass (Ac) 0.30
C= 0.625
1 2year= 6.16 Q(2)= 0.15
1 10year= 7.91 Q(10)= 0.20
Grass Ditch (D#2/TD#2)
DA = 0.16 (Ac)
C Coef.
0.12 Impervious (Ac) 0.95
0.04 Grass (Ac) 0.30
C= 0.788
1 2year= 6.16 Q(2)= 0.78
1 10year= 7.91 Q(10)= 1.06
Grass Ditch (D#4/TD#4)
DA = 0.52 (Ac)
C Coef.
0.13 Impervious (Ac) 0.95
0.39 Grass (Ac) 0.30
C= 0.463
1 2year= 6.16 Q(2)= 1.48
1 10year= 7.91 Q(10)= 1.96
Page 20
Page 20

DA to Infiltration Basin #1
DA = 0.94 (Ac)
C Coef.
0.49 Impervious (Ac) 0.95
0.45 Grass (Ac) 0.30
DA to Infiltration Basin #2
DA = 0.83 (Ac)
C Coef.
0.27 Impervious (Ac) 0.95
0.56[Grass (Ac) 0.30
C=
0.639
C=
0.511
1 2year=
6.16
Q(2)=
3.70
1 2year=
6.16
Q(2)=
2.61
1 10year=
7.91
Q(10)=
4.75
1 10year=
7.91
Q(10)=
3.36
DA to Infiltration Basin #3
DA = 0.41 (Ac)
C Coef.
0.26 Impervious (Ac)
0.95
0.15
Grass (Ac)
0.30
C=
0.712
1 2year=
6.16
Q(2)=
1.80
1 10year=
7.91
Q(10)=
2.31
Page 21

Worksheet for D#1
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type Subcritical
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Grass; Manning's N from
0.120
figure 8.05c Erosion and
0.06250 ft/ft
Sediment Control Manual
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
10-year Q (See Discharge
0.72 ft3/S
Calcs for Ditches)
0.46
ft
0.64
ft2
2.92
ft
0.22
ft
2.77
ft
0.32
ft
0.41286
ft/ft
Ok, Velocity < 4.5 fps
1.13
ft/s
(max allowed for grass
0.02
ft
channels with
0.48
ft
Bermudagrass at 5-10%
0.41
slopes per Table 8.05a)
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.46 ft
0.32 ft
0.06250 ft/ft
0.41286 ft/ft
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:47:28 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 22

Worksheet for D#1 Bare Soil
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type Supercritical
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Bare Soil Conditions
0.023
Manning's N from figure
0.06250
ft/ft
8.05f Erosion and
3.00
ft/ft (H:V)
Sediment Control Manual
3.00
ft/ft (H:V)
0.56
ft3/s
2-year Q
0.23
ft
0.15
ft2
1.43
ft
0.11
ft
1.36
ft
0.29
ft
0.01568
ft/ft
3.65
ft/s
Velocity > 2.0 fps (max
0.21
ft
allowed for bare soil).
0.43
ft
1.91
Liner required.
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.23 ft
0.29 ft
0.06250 ft/ft
0.01568 ft/ft
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:48:16 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 23

Project Description
Friction Method
Solve For
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Worksheet for D#1 Liner
Manning Formula
Normal Depth
Subcritical
0.065
0.06250 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
0.56 ft3/s
0.33 ft
0.33 ft2
2.11 ft
0.16 ft
2.00 ft
0.29 ft
0.12526 ft/ft
1.67 ft/s
0.04 ft
0.38 ft
0.72
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.33 ft
0.29 ft
0.06250 ft/ft
0.12526 ft/ft
Manning's N Straw with
Net from table 8.05e
Erosion and Sediment
Control Manual
2-year Q
Calculated Shear Stress
1.29 = 62.4*0.33*0.0625
Ok, Allowed Shear Stress
from table 8.05g (Straw
with Net) = 1.45
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:48:44 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 24

Project Description
Friction Method
Solve For
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Bottom Width
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
5/7/2019 11:49:08 AM
D#1/TD#1
Worksheet for TD#1 Ri
Manning Formula
Normal Depth
Subcritical
into Basin
0.104
0.30000 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
2.00 ft
0.72 ft3/s
0.15 ft
0.37 ft2
2.95 ft
0.12 ft
2.90 ft
0.15 ft
0.32252 ft/ft
1.95 ft/s
0.06 ft
0.21 ft
0.97
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.15 ft
0.15 ft
0.30000 ft/ft
0.32252 ft/ft
Riprap Class B
Manning's N from figure
8.05f Erosion and
Sediment Control Manual
10-year Q
From figure 8.05j Riprap
d50 required = approx.
5-inches
Ok, providing Class B
Riprap d50 = 8-inches
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 25

Worksheet for D#2
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type Subcritical
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Grass; Manning's N from
0.120
figure 8.05c Erosion and
0.0330o ft/ft
Sediment Control Manual
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
10-year Q (See Discharge
1.00 ft3/s
Calcs for Ditches)
0.59
ft
1.04
ft2
3.72
ft
0.28
ft
3.53
ft
0.37
ft
0.39514
ft/ft
Ok, Velocity < 5.0 fps
0.96
ft/s
(max allowed for grass
0.01
ft
channels with
0.60
ft
Bermudagrass at 0-5%
0.31
slopes per Table 8.05a)
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.59 ft
0.37 ft
0.03300 ft/ft
0.39514 ft/ft
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:50:01 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 26

Worksheet for D#2 Liner
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type Subcritical
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
0.065
0.03300 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
0.78 ft3/s
0.43 ft
0.55 ft2
2.70 ft
0.20 ft
2.56 ft
0.33 ft
0.11985 ft/ft
1.43 ft/s
0.03 ft
0.46 ft
0.55
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.43 ft
0.33 ft
0.03300 ft/ft
0.11985 ft/ft
Manning's N Straw with
Net from table 8.05e
Erosion and Sediment
Control Manual
2-year Q
Calculated Shear Stress
0.89 = 62.4*0.43*0.033
Ok, Allowed Shear Stress
from table 8.05g (Straw
with Net) = 1.45
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:50:23 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 27

Project Description
Friction Method
Solve For
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Bottom Width
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
D#2/TD#2
Worksheet for TD#2 RiaraD into Basin
Manning Formula Slope is worst case scenario
Normal Depth for possible changing site
conditions
Subcritical
0.104
0.20000 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
2.00 ft
1.00 ft3/s
0.20 ft
0.53 ft2
3.28 ft
0.16 ft
3.22 ft
0.18 ft
0.30507 ft/ft
1.89 ft/s
0.06 ft
0.26 ft
0.82
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.20 ft
0.18 ft
0.20000 ft/ft
0.30507 ft/ft
Riprap Class B
Manning's N from figure
8.05f Erosion and
Sediment Control Manual
10-year Q
From figure 8.05j Riprap
d50 required = approx.
3-inches
Ok, providing Class B
Riprap d50 = 8-inches
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 1:22:46 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 28

Worksheet for D#3
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type Subcritical
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Grass; Manning's N from
0.160
figure 8.05c Erosion and
0.03500 ft/ft
Sediment Control Manual
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
10-year Q (See Discharge
0.35 ft3/s
Calcs for Ditches)
0.44
ft
0.57
ft2
2.77
ft
0.21
ft
2.63
ft
0.24
ft
0.80808
ft/ft
Ok, Velocity < 5.0 fps
0.61
ft/s
(max allowed for grass
0.01
ft
channels with
0.44
ft
Bermudagrass at 0-5%
0.23
slopes per Table 8.05a)
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.44 ft
0.24 ft
0.03500 ft/ft
0.80808 ft/ft
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:51:02 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 29

Worksheet for D#3 Bare Soil
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type Supercritical
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Bare Soil Conditions
0.023
Manning's N from figure
0.03500
ft/ft
8.05f Erosion and
3.00
ft/ft (H:V)
Sediment Control Manual
3.00
ft/ft (H:V)
0.27
ft3/s
2-year Q
0.19
ft
0.11
ft2
1.21
ft
0.09
ft
1.15
ft
0.22
ft
0.01729
ft/ft
2.45
ft/s
Velocity > 2.0 fps (max
0.09
ft
allowed for bare soil).
0.28
ft
1.39
Liner required.
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.19 ft
0.22 ft
0.03500 ft/ft
0.01729 ft/ft
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:51:39 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 30

Project Description
Friction Method
Solve For
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Worksheet for D#3 Liner
Manning Formula
Normal Depth
Subcritical
0.065
0.03500 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
0.27 ft3/s
0.28 ft
0.24 ft2
1.79 ft
0.13 ft
1.70 ft
0.22 ft
0.13805 ft/ft
1.12 ft/s
0.02 ft
0.30 ft
0.53
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.28 ft
0.22 ft
0.03500 ft/ft
0.13805 ft/ft
Manning's N Straw with
Net from table 8.05e
Erosion and Sediment
Control Manual
2-year Q
Calculated Shear Stress
0.61 = 62.4*0.28*0.035
Ok, Allowed Shear Stress
from table 8.05g (Straw
with Net) = 1.45
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:52:00 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 31

Project Description
Friction Method
Solve For
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Bottom Width
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
5/7/2019 11:52:22 AM
D#3/TD#3
Worksheet for TD#3 Ri
Manning Formula
Normal Depth
Subcritical
into Basin
0.104
0.25000 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
2.00 ft
0.35 ft3/s
0.10 ft
0.24 ft2
2.66 ft
0.09 ft
2.63 ft
0.09 ft
0.36638 ft/ft
1.45 ft/s
0.03 ft
0.14 ft
0.84
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.10 ft
0.09 ft
0.25000 ft/ft
0.36638 ft/ft
Riprap Class B
Manning's N from figure
8.05f Erosion and
Sediment Control Manual
10-year Q
From figure 8.05j Riprap
d50 required = approx.
2-inches
Ok, providing Class B
Riprap d50 = 8-inches
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 32

Worksheet for D#4
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type Subcritical
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Grass; Manning's N from
0.085
figure 8.05c Erosion and
0.0320o ft/ft
Sediment Control Manual
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
10-year Q (See Discharge
1.90 ft3/s
Calcs for Ditches)
0.66
ft
1.32
ft2
4.19
ft
0.31
ft
3.97
ft
0.48
ft
0.18200
ft/ft
Ok, Velocity < 5.0 fps
1.44
ft/s
(max allowed for grass
0.03
ft
channels with
0.69
ft
Bermudagrass at 0-5%
0.44
slopes per Table 8.05a)
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.66 ft
0.48 ft
0.03200 ft/ft
0.18200 ft/ft
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:52:44 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 33

Project Description
Friction Method
Solve For
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Worksheet for D#4 Liner
Manning Formula
Normal Depth
Subcritical
0.065
0.03200 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
1.48 ft3/s
0.55 ft
0.89 ft2
3.45 ft
0.26 ft
3.27 ft
0.43 ft
0.11004 ft/ft
1.66 ft/s
0.04 ft
0.59 ft
0.56
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.55 ft
0.43 ft
0.03200 ft/ft
0.11004 ft/ft
Manning's N Straw with
Net from table 8.05e
Erosion and Sediment
Control Manual
2-year Q
Calculated Shear Stress
1.10 = 62.4*0.55*0.032
Ok, Allowed Shear Stress
from table 8.05g (Straw
with Net) = 1.45
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:53:09 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 34

D#4/TD#4
Worksheet for TD#4 RiaraD into Basin
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
Channel Slope
Left Side Slope
Right Side Slope
Bottom Width
Discharge
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Downstream Depth
Length
Number Of Steps
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
Subcritical
0.104
0.10000 ft/ft
3.00 ft/ft (H:V)
3.00 ft/ft (H:V)
2.00 ft
1.90 ft3/s
0.35 ft
1.05 ft2
4.19 ft
0.25 ft
4.08 ft
0.26 ft
0.27544 ft/ft
1.80 ft/s
0.05 ft
0.40 ft
0.62
0.00 ft
0.00 ft
0
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.35 ft
0.26 ft
0.10000 ft/ft
0.27544 ft/ft
Riprap Class B
Manning's N from figure
8.05f Erosion and
Sediment Control Manual
10-year Q
Calculated Shear Stress
2.18 = 62.4*0.35*0.10
Ok, Allowed Shear Stress
from table 8.05g (Class B
Riprap d50 = 8" = 2.67)
(interpolated)
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/7/2019 11:53:29 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1
Page 35

Outlet: ES-3/5 6" OUTLET
DuIIE1 W - 00 + La
pipe I
diameter (Do)
w r 0.5Do
Project No.: DFAC
Designed by: JSS
Checked by:
Date: 14-Jun-19
13
Ile
_.
v
..
i
I �
:.:
P 4�
V S '
1 5 10 20 ib 100 M 50D ll.".
Discharge Msfsecj
d (chart) = depth in pipe
Q =
1.83 cfs
dmax = 1.5*(d5o)
V =
6.34 fps
Do = Pipe Diameter
Do =
0.50 ft
6 in
W = Do + La
La =
10 ft
H = minimum height of rip rap channel
W =
10.50 ft
Using 12.5'
d50 (chart)=
0.20 ft
2.4 in
Use Class B RipRap d50= 8 in
dmax =
1.00 ft
12 in
H =
1.00 ft
12.00 in
Riprap_Protection.xls
Page 36

Outlet: ES-8 8" OUTLET
DuIIE1 W - 00 + La
pipe I
diameter (Do)
w r 0.5Do
Project No.: DFAC
Designed by: JSS
Checked by:
Date: 14-Jun-19
13
Ile
_.
v
..
i
I �
:.:
P 4�
V S '
1 5 10 20 ib 100 M 50D ll.".
Discharge Msfsecj
d (chart) = depth in pipe
Q =
0.78 cfs
dmax = 1.5*(d5o)
V =
7.86 fps
Do = Pipe Diameter
Do =
0.67 ft
8 in
W = Do + La
La =
6 ft
H = minimum height of rip rap channel
W =
6.67 ft
Using 7'
d50 (chart)=
0.20 ft
2.4 in
Use Class B RipRap d50= 8 in
dmax =
1.00 ft
12 in
H =
1.00 ft
12.00 in
Riprap_Protection.xls
Page 37

Outlet: FES-11 15" OUTLET Project No.:
Designed by:
Checked by:
Date:
DuIIE1 W - 00 + La
pipe I
diameter (Do)
13
wr r 0.5Do
A
p1 fib ::--: -----------------------
Ile
V $ DYryM1,
*1 4E.
v
i
I �
.............. ............:-...........�:::___I
:.:
P 4�
V S '
1 5 10 20 ib 100 M 50D ll.".
Discharge Msfsecj
DFAC
JSS
14-Jun-19
d (chart) = depth in pipe
Q =
0.37 cfs
dmax = 1.5*(d5o)
V =
2.37 fps
Do = Pipe Diameter
Do =
1.25 ft
15 in
W = Do + La
La =
10 ft
Using 10'
H = minimum height of rip rap channel
W=
11.25 ft
d50 (chart)=
0.20 ft
2.4 in
Use Class B RipRap d50= 8 in
dmax =
1.00 ft
12 in
H =
1.00 ft
12.00 in
Riprap_Protection.xls
Page 38

Outlet: ES-14 4" OUTLET
DuIIE1 W - 00 + La
pipe I
diameter (Do)
w r 0.5Do
Project No.: DFAC
Designed by: JSS
Checked by:
Date: 14-Jun-19
13
Ile
_.
v
..
i
I �
:.:
P 4�
V S '
1 5 10 20 ib 100 M 50D ll.".
Discharge Msfsecj
d (chart) = depth in pipe
Q =
0.20 cfs
dmax = 1.5*(d5o)
V =
2.71 fps
Do = Pipe Diameter
Do =
0.33 ft
4 in
W = Do + La
La =
6 ft
H = minimum height of rip rap channel
W =
6.33 ft
Using 7'
d50 (chart)=
0.20 ft
2.4 in
Use Class B RipRap d50= 8 in
dmax =
1.00 ft
12 in
H =
1.00 ft
12.00 in
Riprap_Protection.xls
Page 39

SOTF-DFAC
Project Summary
SOTF DFAC -
Title Infiltration Basin
#1
Engineer Dan Saltsman
Company
Date 12/13/2019
Notes
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 1 of 25
Page 40

Table of Contents
User Notifications 2
Master Network Summary 3
Ft. Bragg, NC
Time -Depth Curve, 10 years 4
Prop Da #1
Unit Hydrograph Summary, 10 years 6
Infiltration Basin 1 (IN)
Time vs. Elevation, 10 years 8
Infiltration Basin 1
Time vs. Volume, 10 years 12
Riser Barrel Outlet
Outlet Input Data, 10 years 16
Infiltration Basin 1
Elevation -Volume -Flow Table (Pond), 10 years 20
Infiltration Basin 1 (IN)
Pond Infiltration Calculations, 10 years 21
Detention Time, 10 years 22
Level Pool Pond Routing Summary, 10 years 23
Pond Inflow Summary, 10 years 24
Page 41

SOTF-DFAC
Subsection: User Notifications
User Notifications
Message Id 19
Scenario Ft. Bragg, NC - , 10 yrs
Element Type Composite Outlet Structure
Element Id 97
Label Riser Barrel Outlet
Time (N/A)
Message Charged riser flow adjusted to weir flow rate to maintain convergence. If adjustments are
desired, substitute a user defined outlet rating table for level pool routing. Or, store rating
curve(s) in E-Q-TW table, edit, then route with ICPM option.
Source Warning
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 2 of 25
Page 42

SOTF-DFAC
Subsection: Master Network Summary
Catchments Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
Prop Da #1 yrs Bragg, NC - , 10 10 0.233 12.100 2.86
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
Out 1 Ft. Bragg, NC - , 10 10 0.036 12.350 1.09
yrs
Pond Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
Maximum
Maximum
Water
Pond Storage
Surface
(ac-ft)
Elevation
(ft)
Infiltration
Ft. Bragg, NC
10
0.233
12.100
2.86
(N/A)
(N/A)
Basin 1 (IN)
- , 10 yrs
Infiltration
Ft. Bragg, NC
Basin 1
10 yrs
10
0.036
12.350
1.09
297.31
0.085
(OUT)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
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Page 3 of 25
Page 43

SOTF-DFAC
Subsection: Time -Depth Curve
Label: Ft. Bragg, NC
Time -Depth Curve: TypeIII 24hr (10 yr)
Label TypeIII 24hr (10
yr)
Start Time 0.000 hours
Increment 0.100 hours
End Time 24.000 hours
Return Event 10 years
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
CUMULATIVE RAINFALL (in)
Output Time Increment = 0.100 hours
Time on left represents time for first value in each row.
Time Depth Depth Depth Depth Depth
(hours) (in) (in) (in) (in) (in)
0.000
0.0
0.0
0.0
0.0
0.0
0.500
0.0
0.0
0.0
0.0
0.0
1.000
0.1
0.1
0.1
0.1
0.1
1.500
0.1
0.1
0.1
0.1
0.1
2.000
0.1
0.1
0.1
0.1
0.1
2.500
0.1
0.1
0.1
0.2
0.2
3.000
0.2
0.2
0.2
0.2
0.2
3.500
0.2
0.2
0.2
0.2
0.2
4.000
0.2
0.2
0.2
0.3
0.3
4.500
0.3
0.3
0.3
0.3
0.3
5.000
0.3
0.3
0.3
0.3
0.3
5.500
0.3
0.4
0.4
0.4
0.4
6.000
0.4
0.4
0.4
0.4
0.4
6.500
0.4
0.4
0.5
0.5
0.5
7.000
0.5
0.5
0.5
0.5
0.5
7.500
0.6
0.6
0.6
0.6
0.6
8.000
0.6
0.6
0.6
0.7
0.7
8.500
0.7
0.7
0.7
0.8
0.8
9.000
0.8
0.8
0.8
0.9
0.9
9.500
0.9
0.9
1.0
1.0
1.0
10.000
1.0
1.1
1.1
1.1
1.1
10.500
1.2
1.2
1.2
1.3
1.3
11.000
1.4
1.4
1.4
1.5
1.6
11.500
1.6
1.7
1.8
2.0
2.3
12.000
2.7
3.2
3.4
3.6
3.7
12.500
3.8
3.9
3.9
4.0
4.0
13.000
4.1
4.1
4.2
4.2
4.2
13.500
4.3
4.3
4.3
4.4
4.4
14.000
4.4
4.4
4.5
4.5
4.5
14.500
4.5
4.6
4.6
4.6
4.6
15.000
4.6
4.7
4.7
4.7
4.7
15.500
4.7
4.8
4.8
4.8
4.8
16.000
4.8
4.8
4.8
4.9
4.9
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 4 of 25
Page 44

SOTF-DFAC
Subsection: Time -Depth Curve
Label: Ft. Bragg, NC
CUMULATIVE RAINFALL (in)
Output Time Increment = 0.100 hours
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Time
on left represents time for first value
in each row.
Time
Depth
Depth
Depth
Depth
Depth
(hours)
(in)
(in)
(in)
(in)
(in)
16.500
4.9
4.9
4.9
4.9
4.9
17.000
4.9
5.0
5.0
5.0
5.0
17.500
5.0
5.0
5.0
5.0
5.0
18.000
5.0
5.1
5.1
5.1
5.1
18.500
5.1
5.1
5.1
5.1
5.1
19.000
5.1
5.1
5.1
5.2
5.2
19.500
5.2
5.2
5.2
5.2
5.2
20.000
5.2
5.2
5.2
5.2
5.2
20.500
5.2
5.2
5.3
5.3
5.3
21.000
5.3
5.3
5.3
5.3
5.3
21.500
5.3
5.3
5.3
5.3
5.3
22.000
5.3
5.3
5.3
5.4
5.4
22.500
5.4
5.4
5.4
5.4
5.4
23.000
5.4
5.4
5.4
5.4
5.4
23.500
5.4
5.4
5.4
5.4
5.4
24.000
5.4
(N/A)
(N/A)
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 5 of 25
Page 45

SOTF-DFAC
Subsection: Unit Hydrograph Summary
Label: Prop Da #1
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Storm Event TypeIII 24hr (10
yr)
Return Event
10 years
Duration
35.000 hours
Depth
5.4 in
Time of Concentration
0.100 hours
(Composite)
Area (User Defined)
1.030 acres
Computational Time
0.013 hours
Increment
Time to Peak (Computed)
12.107 hours
Flow (Peak, Computed)
2.88 ft3/s
Output Increment
0.050 hours
Time to Flow (Peak
12.100 hours
Interpolated Output)
Flow (Peak Interpolated
2.86 ft3/s
Output)
Drainage Area
SCS CN (Composite)
74.000
Area (User Defined)
1.030 acres
Maximum Retention
3.5 in
(Pervious)
Maximum Retention
0.7in
(Pervious, 20 percent)
Cumulative Runoff
Cumulative Runoff Depth
2.7 in
(Pervious)
Runoff Volume (Pervious)
0.233 ac-ft
Hydrograph Volume (Area under Hydrograph curve)
Volume
0.233 ac-ft
SCS Unit Hydrograph Parameters
Time of Concentration
0.100 hours
(Composite)
Computational Time
0.013 hours
Increment
Unit Hydrograph Shape
483.432
Factor
K Factor
0.749
Receding/Rising, Tr/Tp
1.670
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive
Suite 200 W
Watertown, CT 06795 USA
+ 1 -203-755-1666
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[08.11.01.56]
Page 6 of 25
Page 46

SOTF-DFAC
Subsection: Unit Hydrograph Summary
Label: Prop Da #1
SCS Unit Hydrograph Parameters
Unit peak, qp 11.67 ft3/s
Unit peak time, Tp 0.067 hours
Unit receding limb, Tr 0.267 hours
Total unit time, Tb 0.333 hours
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 7 of 25
Page 47

SOTF-DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 1 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time Elevation Elevation Elevation Elevation Elevation
(hours) (ft) (ft) (ft) (ft) (ft)
0.000
295.75
295.75
295.75
295.75
295.75
0.250
295.75
295.75
295.75
295.75
295.75
0.500
295.75
295.75
295.75
295.75
295.75
0.750
295.75
295.75
295.75
295.75
295.75
1.000
295.75
295.75
295.75
295.75
295.75
1.250
295.75
295.75
295.75
295.75
295.75
1.500
295.75
295.75
295.75
295.75
295.75
1.750
295.75
295.75
295.75
295.75
295.75
2.000
295.75
295.75
295.75
295.75
295.75
2.250
295.75
295.75
295.75
295.75
295.75
2.500
295.75
295.75
295.75
295.75
295.75
2.750
295.75
295.75
295.75
295.75
295.75
3.000
295.75
295.75
295.75
295.75
295.75
3.250
295.75
295.75
295.75
295.75
295.75
3.500
295.75
295.75
295.75
295.75
295.75
3.750
295.75
295.75
295.75
295.75
295.75
4.000
295.75
295.75
295.75
295.75
295.75
4.250
295.75
295.75
295.75
295.75
295.75
4.500
295.75
295.75
295.75
295.75
295.75
4.750
295.75
295.75
295.75
295.75
295.75
5.000
295.75
295.75
295.75
295.75
295.75
5.250
295.75
295.75
295.75
295.75
295.75
5.500
295.75
295.75
295.75
295.75
295.75
5.750
295.75
295.75
295.75
295.75
295.75
6.000
295.75
295.75
295.75
295.75
295.75
6.250
295.75
295.75
295.75
295.75
295.75
6.500
295.75
295.75
295.75
295.75
295.75
6.750
295.75
295.75
295.75
295.75
295.75
7.000
295.75
295.75
295.75
295.75
295.75
7.250
295.75
295.75
295.75
295.75
295.75
7.500
295.75
295.75
295.75
295.75
295.75
7.750
295.75
295.75
295.75
295.75
295.75
8.000
295.75
295.75
295.75
295.75
295.75
8.250
295.75
295.75
295.75
295.75
295.75
8.500
295.75
295.75
295.75
295.75
295.75
8.750
295.75
295.75
295.75
295.75
295.75
9.000
295.75
295.75
295.75
295.76
295.76
9.250
295.76
295.76
295.76
295.76
295.76
9.500
295.77
295.77
295.77
295.77
295.77
9.750
295.78
295.78
295.78
295.78
295.79
10.000
295.79
295.79
295.80
295.80
295.80
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
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[08.11.01.56]
Page 8 of 25
Page 48

SOTF-DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 1 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
10.250
295.81
295.81
295.82
295.82
295.82
10.500
295.83
295.83
295.84
295.85
295.85
10.750
295.86
295.86
295.87
295.88
295.88
11.000
295.89
295.90
295.91
295.91
295.92
11.250
295.93
295.95
295.96
295.97
295.98
11.500
296.00
296.02
296.04
296.07
296.10
11.750
296.15
296.21
296.28
296.34
296.44
12.000
296.57
296.75
296.91
297.06
297.19
12.250
297.27
297.30
297.31
297.30
297.29
12.500
297.29
297.28
297.27
297.27
297.26
12.750
297.26
297.26
297.26
297.26
297.26
13.000
297.26
297.26
297.26
297.25
297.25
13.250
297.25
297.25
297.25
297.25
297.25
13.500
297.25
297.25
297.25
297.25
297.25
13.750
297.25
297.25
297.25
297.25
297.25
14.000
297.25
297.25
297.25
297.25
297.25
14.250
297.25
297.25
297.24
297.24
297.24
14.500
297.24
297.24
297.24
297.23
297.23
14.750
297.23
297.23
297.22
297.22
297.22
15.000
297.22
297.21
297.21
297.21
297.20
15.250
297.20
297.20
297.19
297.19
297.18
15.500
297.18
297.17
297.17
297.16
297.16
15.750
297.16
297.15
297.14
297.14
297.13
16.000
297.13
297.12
297.12
297.11
297.11
16.250
297.10
297.09
297.09
297.08
297.07
16.500
297.07
297.06
297.06
297.05
297.04
16.750
297.04
297.03
297.02
297.02
297.01
17.000
297.01
297.00
296.99
296.99
296.98
17.250
296.97
296.97
296.96
296.95
296.94
17.500
296.94
296.93
296.92
296.92
296.91
17.750
296.90
296.90
296.89
296.88
296.87
18.000
296.87
296.86
296.85
296.85
296.84
18.250
296.83
296.82
296.82
296.81
296.80
18.500
296.80
296.79
296.78
296.77
296.77
18.750
296.76
296.75
296.75
296.74
296.73
19.000
296.72
296.71
296.70
296.69
296.68
19.250
296.68
296.67
296.66
296.65
296.64
19.500
296.63
296.62
296.62
296.61
296.60
19.750
296.59
296.58
296.57
296.57
296.56
20.000
296.55
296.54
296.53
296.53
296.52
20.250
296.51
296.50
296.49
296.49
296.48
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #1.ppc Center [08.11.01.56]
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Watertown, CT 06795 USA + 1 -203-755-1666
Page 49

SOTF-DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 1 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
20.500
296.47
296.46
296.45
296.45
296.44
20.750
296.43
296.42
296.41
296.41
296.40
21.000
296.39
296.38
296.38
296.37
296.36
21.250
296.35
296.35
296.34
296.33
296.32
21.500
296.32
296.31
296.30
296.29
296.29
21.750
296.28
296.27
296.27
296.26
296.25
22.000
296.24
296.23
296.23
296.22
296.21
22.250
296.20
296.19
296.18
296.18
296.17
22.500
296.16
296.16
296.15
296.14
296.14
22.750
296.13
296.12
296.12
296.11
296.11
23.000
296.10
296.09
296.09
296.08
296.08
23.250
296.07
296.07
296.06
296.06
296.06
23.500
296.05
296.05
296.04
296.04
296.03
23.750
296.03
296.03
296.02
296.02
296.02
24.000
296.01
296.01
296.00
296.00
295.99
24.250
295.98
295.98
295.97
295.96
295.96
24.500
295.95
295.95
295.94
295.94
295.93
24.750
295.92
295.92
295.92
295.91
295.91
25.000
295.90
295.90
295.89
295.89
295.89
25.250
295.88
295.88
295.87
295.87
295.87
25.500
295.86
295.86
295.86
295.85
295.85
25.750
295.85
295.85
295.84
295.84
295.84
26.000
295.84
295.83
295.83
295.83
295.83
26.250
295.82
295.82
295.82
295.82
295.82
26.500
295.81
295.81
295.81
295.81
295.81
26.750
295.81
295.80
295.80
295.80
295.80
27.000
295.80
295.80
295.80
295.79
295.79
27.250
295.79
295.79
295.79
295.79
295.79
27.500
295.79
295.79
295.78
295.78
295.78
27.750
295.78
295.78
295.78
295.78
295.78
28.000
295.78
295.78
295.78
295.77
295.77
28.250
295.77
295.77
295.77
295.77
295.77
28.500
295.77
295.77
295.77
295.77
295.77
28.750
295.77
295.77
295.77
295.77
295.77
29.000
295.77
295.76
295.76
295.76
295.76
29.250
295.76
295.76
295.76
295.76
295.76
29.500
295.76
295.76
295.76
295.76
295.76
29.750
295.76
295.76
295.76
295.76
295.76
30.000
295.76
295.76
295.76
295.76
295.76
30.250
295.76
295.76
295.76
295.76
295.76
30.500
295.76
295.76
295.76
295.76
295.76
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #1.ppc Center [08.11.01.56]
12/13/2019 27 Siemon Company Drive Suite 200 W Page 10 of 25
Watertown, CT 06795 USA + 1 -203-755-1666
Page 50

SOTF-DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 1 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
30.750
295.76
295.76
295.76
295.76
295.76
31.000
295.75
295.75
295.75
295.75
295.75
31.250
295.75
295.75
295.75
295.75
295.75
31.500
295.75
295.75
295.75
295.75
295.75
31.750
295.75
295.75
295.75
295.75
295.75
32.000
295.75
295.75
295.75
295.75
295.75
32.250
295.75
295.75
295.75
295.75
295.75
32.500
295.75
295.75
295.75
295.75
295.75
32.750
295.75
295.75
295.75
295.75
295.75
33.000
295.75
295.75
295.75
295.75
295.75
33.250
295.75
295.75
295.75
295.75
295.75
33.500
295.75
295.75
295.75
295.75
295.75
33.750
295.75
295.75
295.75
295.75
295.75
34.000
295.75
295.75
295.75
295.75
295.75
34.250
295.75
295.75
295.75
295.75
295.75
34.500
295.75
295.75
295.75
295.75
295.75
34.750
295.75
295.75
295.75
295.75
295.75
35.000
295.75
(N/A)
(N/A)
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley Pond Pack V8i
[08.11.01.56]
Page 11 of 25
Page 51

SOTF-DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 1 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time Volume Volume Volume Volume Volume
(hours) (ac-ft) (ac-ft) (ac-ft) (ac-ft) (ac-ft)
0.000
0.000
0.000
0.000
0.000
0.000
0.250
0.000
0.000
0.000
0.000
0.000
0.500
0.000
0.000
0.000
0.000
0.000
0.750
0.000
0.000
0.000
0.000
0.000
1.000
0.000
0.000
0.000
0.000
0.000
1.250
0.000
0.000
0.000
0.000
0.000
1.500
0.000
0.000
0.000
0.000
0.000
1.750
0.000
0.000
0.000
0.000
0.000
2.000
0.000
0.000
0.000
0.000
0.000
2.250
0.000
0.000
0.000
0.000
0.000
2.500
0.000
0.000
0.000
0.000
0.000
2.750
0.000
0.000
0.000
0.000
0.000
3.000
0.000
0.000
0.000
0.000
0.000
3.250
0.000
0.000
0.000
0.000
0.000
3.500
0.000
0.000
0.000
0.000
0.000
3.750
0.000
0.000
0.000
0.000
0.000
4.000
0.000
0.000
0.000
0.000
0.000
4.250
0.000
0.000
0.000
0.000
0.000
4.500
0.000
0.000
0.000
0.000
0.000
4.750
0.000
0.000
0.000
0.000
0.000
5.000
0.000
0.000
0.000
0.000
0.000
5.250
0.000
0.000
0.000
0.000
0.000
5.500
0.000
0.000
0.000
0.000
0.000
5.750
0.000
0.000
0.000
0.000
0.000
6.000
0.000
0.000
0.000
0.000
0.000
6.250
0.000
0.000
0.000
0.000
0.000
6.500
0.000
0.000
0.000
0.000
0.000
6.750
0.000
0.000
0.000
0.000
0.000
7.000
0.000
0.000
0.000
0.000
0.000
7.250
0.000
0.000
0.000
0.000
0.000
7.500
0.000
0.000
0.000
0.000
0.000
7.750
0.000
0.000
0.000
0.000
0.000
8.000
0.000
0.000
0.000
0.000
0.000
8.250
0.000
0.000
0.000
0.000
0.000
8.500
0.000
0.000
0.000
0.000
0.000
8.750
0.000
0.000
0.000
0.000
0.000
9.000
0.000
0.000
0.000
0.000
0.000
9.250
0.000
0.000
0.000
0.000
0.001
9.500
0.001
0.001
0.001
0.001
0.001
9.750
0.001
0.001
0.001
0.001
0.001
10.000
0.001
0.002
0.002
0.002
0.002
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 12 of 25
Page 52

SOTF-DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 1 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
10.250
0.002
0.002
0.002
0.003
0.003
10.500
0.003
0.003
0.003
0.003
0.004
10.750
0.004
0.004
0.004
0.005
0.005
11.000
0.005
0.005
0.006
0.006
0.006
11.250
0.007
0.007
0.008
0.008
0.009
11.500
0.009
0.010
0.011
0.012
0.014
11.750
0.016
0.019
0.022
0.025
0.030
12.000
0.037
0.047
0.057
0.067
0.076
12.250
0.082
0.084
0.085
0.084
0.084
12.500
0.083
0.083
0.082
0.082
0.081
12.750
0.081
0.081
0.081
0.081
0.081
13.000
0.081
0.081
0.081
0.081
0.081
13.250
0.081
0.081
0.081
0.081
0.081
13.500
0.081
0.081
0.081
0.081
0.081
13.750
0.081
0.081
0.081
0.081
0.080
14.000
0.080
0.080
0.080
0.080
0.080
14.250
0.080
0.080
0.080
0.080
0.080
14.500
0.080
0.080
0.079
0.079
0.079
14.750
0.079
0.079
0.079
0.078
0.078
15.000
0.078
0.078
0.078
0.077
0.077
15.250
0.077
0.076
0.076
0.076
0.076
15.500
0.075
0.075
0.075
0.074
0.074
15.750
0.074
0.073
0.073
0.073
0.072
16.000
0.072
0.071
0.071
0.071
0.070
16.250
0.070
0.069
0.069
0.068
0.068
16.500
0.068
0.067
0.067
0.066
0.066
16.750
0.065
0.065
0.065
0.064
0.064
17.000
0.063
0.063
0.062
0.062
0.062
17.250
0.061
0.061
0.060
0.060
0.059
17.500
0.059
0.058
0.058
0.058
0.057
17.750
0.057
0.056
0.056
0.055
0.055
18.000
0.054
0.054
0.053
0.053
0.053
18.250
0.052
0.052
0.051
0.051
0.050
18.500
0.050
0.049
0.049
0.049
0.048
18.750
0.048
0.047
0.047
0.046
0.046
19.000
0.045
0.045
0.044
0.044
0.043
19.250
0.043
0.042
0.042
0.041
0.041
19.500
0.040
0.040
0.039
0.039
0.038
19.750
0.038
0.037
0.037
0.037
0.036
20.000
0.036
0.035
0.035
0.034
0.034
20.250
0.033
0.033
0.033
0.032
0.032
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #1.ppc Center [08.11.01.56]
12/13/2019 27 Siemon Company Drive Suite 200 W Page 13 of 25
Watertown, CT 06795 USA + 1 -203-755-1666
Page 53

SOTF-DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 1 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
20.500
0.031
0.031
0.031
0.030
0.030
20.750
0.029
0.029
0.029
0.028
0.028
21.000
0.027
0.027
0.027
0.026
0.026
21.250
0.025
0.025
0.025
0.024
0.024
21.500
0.024
0.023
0.023
0.023
0.022
21.750
0.022
0.022
0.021
0.021
0.021
22.000
0.020
0.020
0.019
0.019
0.019
22.250
0.018
0.018
0.017
0.017
0.017
22.500
0.016
0.016
0.016
0.016
0.015
22.750
0.015
0.015
0.014
0.014
0.014
23.000
0.014
0.013
0.013
0.013
0.013
23.250
0.013
0.012
0.012
0.012
0.012
23.500
0.012
0.011
0.011
0.011
0.011
23.750
0.011
0.011
0.010
0.010
0.010
24.000
0.010
0.010
0.010
0.009
0.009
24.250
0.009
0.009
0.008
0.008
0.008
24.500
0.008
0.007
0.007
0.007
0.007
24.750
0.006
0.006
0.006
0.006
0.006
25.000
0.006
0.005
0.005
0.005
0.005
25.250
0.005
0.005
0.005
0.004
0.004
25.500
0.004
0.004
0.004
0.004
0.004
25.750
0.004
0.003
0.003
0.003
0.003
26.000
0.003
0.003
0.003
0.003
0.003
26.250
0.003
0.003
0.003
0.002
0.002
26.500
0.002
0.002
0.002
0.002
0.002
26.750
0.002
0.002
0.002
0.002
0.002
27.000
0.002
0.002
0.002
0.002
0.002
27.250
0.001
0.001
0.001
0.001
0.001
27.500
0.001
0.001
0.001
0.001
0.001
27.750
0.001
0.001
0.001
0.001
0.001
28.000
0.001
0.001
0.001
0.001
0.001
28.250
0.001
0.001
0.001
0.001
0.001
28.500
0.001
0.001
0.001
0.001
0.001
28.750
0.001
0.001
0.001
0.001
0.001
29.000
0.001
0.001
0.001
0.001
0.000
29.250
0.000
0.000
0.000
0.000
0.000
29.500
0.000
0.000
0.000
0.000
0.000
29.750
0.000
0.000
0.000
0.000
0.000
30.000
0.000
0.000
0.000
0.000
0.000
30.250
0.000
0.000
0.000
0.000
0.000
30.500
0.000
0.000
0.000
0.000
0.000
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #1.ppc Center [08.11.01.56]
12/13/2019 27 Siemon Company Drive Suite 200 W Page 14 of 25
Watertown, CT 06795 USA + 1 -203-755-1666
Page 54

SOTF-DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 1 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
30.750
0.000
0.000
0.000
0.000
0.000
31.000
0.000
0.000
0.000
0.000
0.000
31.250
0.000
0.000
0.000
0.000
0.000
31.500
0.000
0.000
0.000
0.000
0.000
31.750
0.000
0.000
0.000
0.000
0.000
32.000
0.000
0.000
0.000
0.000
0.000
32.250
0.000
0.000
0.000
0.000
0.000
32.500
0.000
0.000
0.000
0.000
0.000
32.750
0.000
0.000
0.000
0.000
0.000
33.000
0.000
0.000
0.000
0.000
0.000
33.250
0.000
0.000
0.000
0.000
0.000
33.500
0.000
0.000
0.000
0.000
0.000
33.750
0.000
0.000
0.000
0.000
0.000
34.000
0.000
0.000
0.000
0.000
0.000
34.250
0.000
0.000
0.000
0.000
0.000
34.500
0.000
0.000
0.000
0.000
0.000
34.750
0.000
0.000
0.000
0.000
0.000
35.000
0.000
(N/A)
(N/A)
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 15 of 25
Page 55

SOTF-DFAC
Subsection: Outlet Input Data
Label: Riser Barrel Outlet
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Requested Pond Water Surface Elevations
Minimum (Headwater) 295.75 ft
Increment (Headwater) 0.50 ft
Maximum (Headwater) 298.35 ft
Outlet Connectivity
Structure Type Outlet ID Direction Outfall E1 E2
(ft) (ft)
Barrel
Inlet Box
Riser
Forward
(Outlet
297.25
298.35
Pipe)
Barrel
Culvert -Circular
(Outlet
Forward
TW
294.40
298.35
Pipe)
Tailwater Settings
Tailwater
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #1.ppc Center
12/13/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 16 of 25
Page 56

Subsection: Outlet Input Data
Label: Riser Barrel Outlet
SOTF DFAC-Infiltration #1.ppc
12/13/2019
SOTF-DFAC
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Structure ID: Riser
Structure Type: Inlet Box
Number of Openings
1
Elevation
297.25 ft
Orifice Area
6.0 ftz
Orifice Coefficient
0.600
Weir Length
10.00 ft
Weir Coefficient
3.00 (ft^0.5)/s
K Reverse
1.000
Manning's n
0.000
Kev, Charged Riser
0.000
Weir Submergence
False
Orifice H to crest
False
Structure ID: Barrel (Outlet Pipe)
Structure Type: Culvert -Circular
Number of Barrels
1
Diameter
18.0 in
Length
52.00 ft
Length (Computed Barrel)
52.00 ft
Slope (Computed)
0.004 ft/ft
Outlet Control Data
Manning's n
0.024
Ke
0.500
Kb
0.062
Kr
0.500
Convergence Tolerance
0.00 ft
Inlet Control Data
Equation Form
Form 1
K
0.0078
M
2.0000
C
0.0379
Y
0.6900
T1 ratio (HW/D)
1.134
T2 ratio (HW/D)
1.294
Slope Correction Factor
-0.500
Bentley Systems, Inc. Haestad Methods Solution
Center
27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 17 of 25
Page 57

SOTF-DFAC
Subsection: Outlet Input Data
Label: Riser Barrel Outlet
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Use unsubmerged inlet control 0 equation below T1
elevation.
Use submerged inlet control 0 equation above T2
elevation
In transition zone between unsubmerged and submerged
inlet control,
interpolate between flows at T1 & T2...
T1 Elevation 296.10 ft T1 Flow 7.58 ft3/s
T2 Elevation 296.34 ft T2 Flow 8.66 ft3/s
Bentley Systems, Inc. Haestad Methods Solution
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Page 18 of 25
Page 58

Subsection: Outlet Input Data
Label: Riser Barrel Outlet
SOTF DFAC-Infiltration #1.ppc
12/13/2019
SOTF-DFAC
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Structure ID: TW
Structure Type: TW Setup, DS
Channel
Tailwater Type
Free Outfall
Convergence Tolerances
Maximum Iterations
40
Tailwater Tolerance
0.01 ft
(Minimum)
Tailwater Tolerance
0.50 ft
(Maximum)
Headwater Tolerance
0.01 ft
(Minimum)
Headwater Tolerance
0.50 ft
(Maximum)
Flow Tolerance (Minimum)
0.001 ft3/s
Flow Tolerance (Maximum)
10.000 ft3/s
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Page 59

SOTF-DFAC
Subsection: Elevation -Volume -Flow Table (Pond)
Label: Infiltration Basin 1
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
3.0000 in/h
Initial Conditions
Elevation (Water Surface,
295.75 ft
Initial)
Volume (Initial)
0.000 ac-ft
Flow (Initial Outlet)
0.00 ft3/S
Flow (Initial Infiltration)
0.00 ft3/S
Flow (Initial, Total)
0.00 ft3/S
Time Increment
0.050 hours
Elevation Outflow Storage Area
(ft) (ft3/S) (ac-ft) (acres)
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Infiltration Flow (Total) 2S/t + 0
(ft3/S) (ft3/S) (ft3/S)
295.75
0.00
0.000
0.035
0.00
0.00
0.00
296.25
0.00
0.020
0.047
0.14
0.14
10.05
296.75
0.00
0.047
0.060
0.18
0.18
22.98
297.25
0.00
0.080
0.073
0.22
0.22
39.16
297.75
9.67
0.120
0.085
0.26
9.93
68.02
298.25
10.64
0.166
0.098
0.30
10.94
91.27
298.35
10.83
0.176
0.101
0.31
11.13
96.30
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Page 20 of 25
Page 60

SOTF-DFAC
Subsection: Pond Infiltration Calculations
Label: Infiltration Basin 1 (IN)
Average Infiltration Rating Table
Elevation (Water Area (Total) Flow (Infiltration)
Surface) (ftz) (ft3/s)
(ft)
295.75
1,524.6
0.00
296.25
2,043.2
0.14
296.75
2,609.4
0.18
297.25
3,179.9
0.22
297.75
3,721.0
0.26
298.25
4,285.7
0.30
298.35
4,399.6
0.31
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Page 21 of 25
Page 61

SOTF-DFAC
Subsection: Detention Time
Label: Infiltration Basin 1 (IN)
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
3.0000 in/h
Approximate Detention Times
Time to Peak (Outflow +
Infiltration, Peak to Peak
12.350 hours
Detention Time)
Time to Peak (Inflow, Peak
12.100 hours
to Peak Detention Time)
Detention Time (Peak to
0.250 hours
Peak)
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Page 22 of 25
Page 62

SOTF-DFAC
Subsection: Level Pool Pond Routing Summary
Label: Infiltration Basin 1 (IN)
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
3.0000 in/h
Initial Conditions
Elevation (Water Surface,
295.75 ft
Initial)
Volume (Initial)
0.000 ac-ft
Flow (Initial Outlet)
0.00 ft3/s
Flow (Initial Infiltration)
0.00 ft3/s
Flow (Initial, Total)
0.00 ft3/s
Time Increment
0.050 hours
Inflow/Outflow Hydrograph Summary
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Flow (Peak In)
2.86 ft3/s
Time to Peak (Flow, In) 12.100 hours
Infiltration (Peak)
0.23 ft3/s
Time to Peak (Infiltration) 12.350 hours
Flow (Peak Outlet)
1.09 ft3/s
Time to Peak (Flow, Outlet) 12.350 hours
Elevation (Water Surface,
297.31 ft
Peak)
Volume (Peak)
0.085 ac-ft
Mass Balance (ac-ft)
Volume (Initial)
0.000 ac-ft
Volume (Total Inflow)
0.233 ac-ft
Volume (Total Infiltration)
0.197 ac-ft
Volume (Total Outlet
0.036 ac-ft
Outflow)
Volume (Retained)
0.000 ac-ft
Volume (Unrouted)
0.000 ac-ft
Error (Mass Balance)
0.0 %
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Page 23 of 25
Page 63

SOTF-DFAC
Subsection: Pond Inflow Summary
Label: Infiltration Basin 1 (IN)
Summary for Hydrograph Addition at'Infiltration Basin 1'
Upstream Link
Upstream Node
<Catchment to Outflow Node>
Prop Da #1
Node Inflows
Inflow Type Element
Volume Time to Peak Flow (Peak)
(ac-ft) (hours) (ft3/s)
Flow (From) Prop Da #1
0.233 12.100 2.86
Flow (In) Infiltration
0.233 12.100 2.86
Basin 1
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Page 24 of 25
Page 64

SOTF-DFAC
Index
F
Ft. Bragg, NC (Time -Depth Curve, 10 years) ... 4, 5
I
Infiltration Basin 1 (Elevation -Volume -Flow Table (Pond), 10 years) ... 20
Infiltration Basin 1 (IN) (Detention Time, 10 years) ... 22
Infiltration Basin 1 (IN) (Level Pool Pond Routing Summary, 10 years) ... 23
Infiltration Basin 1 (IN) (Pond Infiltration Calculations, 10 years) ... 21
Infiltration Basin 1 (IN) (Pond Inflow Summary, 10 years) ... 24
Infiltration Basin 1 (IN) (Time vs. Elevation, 10 years) ... 8, 9, 10, 11
Infiltration Basin 1 (Time vs. Volume, 10 years) ... 12, 13, 14, 15
M
Master Network Summary ... 3
P
Prop Da #1 (Unit Hydrograph Summary, 10 years) ... 6, 7
R
Riser Barrel Outlet (Outlet Input Data, 10 years)...16, 17, 18, 19
U
User Notifications ... 2
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Page 25 of 25
Page 65

SOTF DFAC
Project Summary
SOTF DFAC -
Title Infiltration Basin
#2
Engineer jsesler
Company
Date 11/15/2018
Notes
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Page 1 of 42
Page 66

Table of Contents
User Notifications 2
Master Network Summary 4
Ft. Bragg, NC Time -Depth Curve, 10 years 6
Prop DA #2
Unit Hydrograph Summary, 10 years 8
Prop DA #3
Unit Hydrograph Summary, 10 years 10
Infiltration Basin #3 (IN)
Time vs. Elevation, 10 years 12
Infiltration Basin 2 (IN)
Time vs. Elevation, 10 years 16
Infiltration Basin #3
Time vs. Volume, 10 years 20
Infiltration Basin 2
Time vs. Volume, 10 years 24
Riser Barrel Outlet
Outlet Input Data, 10 years 28
Infiltration Basin #3
Elevation -Volume -Flow Table (Pond), 10 years 32
Infiltration Basin #3 (IN)
Pond Infiltration Calculations, 10 years 33
Detention Time, 10 years 34
Level Pool Pond Routing Summary, 10 years 35
Pond Inflow Summary, 10 years 36
Infiltration Basin 2
Elevation -Volume -Flow Table (Pond), 10 years 37
Infiltration Basin 2 (IN)
Pond Infiltration Calculations, 10 years 38
Detention Time, 10 years 39
Level Pool Pond Routing Summary, 10 years 40
Pond Inflow Summary, 10 years 41
Page 67

SOTF DFAC
Subsection: User Notifications
User Notifications
Message Id 7
Scenario Ft. Bragg, NC - , 10 yrs
Element Type Catchment
Element Id 98
Label Prop DA #2
Time (N/A)
Message The difference between calculated peak flow and interpolated peak flow 3.2 % is greater than
1.5 %. Computed peak flow= 1.14 ft3/s Interp. peak flow= 1.10 ft3/s. Output increment for
this catchment may be too large.
Source Warning
Message Id
19
Scenario
Ft. Bragg, NC - , 10 yrs
Element Type
Composite Outlet Structure
Element Id
97
Label
Riser Barrel Outlet
Time
(N/A)
Message
Charged riser flow adjusted to weir flow rate to maintain convergence. If adjustments are
desired, substitute a user defined outlet rating table for level pool routing. Or, store rating
curve(s) in E-Q-TW table, edit, then route with ICPM option.
Source
Warning
Message Id
7
Scenario
Ft. Bragg, NC - , 25 yrs
Element Type
Catchment
Element Id
98
Label
Prop DA #2
Time
(N/A)
Message
The difference between calculated peak flow and interpolated peak flow 2.2 % is greater than
1.5 %. Computed peak flow= 1.72 ft3/s Interp. peak flow= 1.68 ft3/s. Output increment for
this catchment may be too large.
Source
Warning
Message Id 19
Scenario Ft. Bragg, NC - , 25 yrs
Element Type Composite Outlet Structure
Element Id 97
Label Riser Barrel Outlet
Time (N/A)
Message Charged riser flow adjusted to weir flow rate to maintain convergence. If adjustments are
desired, substitute a user defined outlet rating table for level pool routing. Or, store rating
curve(s) in E-Q-TW table, edit, then route with ICPM option.
Source Warning
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Page 2 of 42
Page 68

SOTF DFAC
Subsection: User Notifications
User Notifications
Message Id 19
Scenario Ft. Bragg, NC - , 100 yrs
Element Type Composite Outlet Structure
Element Id 97
Label Riser Barrel Outlet
Time (N/A)
Message Charged riser flow adjusted to weir flow rate to maintain convergence. If adjustments are
desired, substitute a user defined outlet rating table for level pool routing. Or, store rating
curve(s) in E-Q-TW table, edit, then route with ICPM option.
Source Warning
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Page 3 of 42
Page 69

Subsection: Master Network Summary
Catchments Summary
Label Scenario
SOTF DFAC
Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
Prop DA #2
yrs Bragg, NC - , 10
10
0.098
12.100
1.10
Prop DA #2
yrs Bragg, NC - , 25
25
0.143
12.100
1.68
Prop DA #2
yrs Bragg, NC - , 100
100
0.225
12.100
2.73
Prop DA #3
yrs Bragg, NC - , 10
10
0.099
12.100
1.21
Prop DA #3
yrs Bragg, NC - , 25
25
0.130
12.100
1.58
Prop DA #3
yrs Bragg, NC - , 100
100
0.182
12.100
2.20
Node Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
@ Riser 3
yrs Bragg, NC - , 10
10
0.010
12.400
0.37
@ Riser 3
yrs Bragg, NC - , 25
25
0.045
12.200
1.00
@ Riser 3
yrs Bragg, NC - , 100
100
0.146
12.200
3.29
Pond Summary
Label Scenario Return Hydrograph Time to Peak Peak Flow
Event Volume (hours) (ft3/s)
(years) (ac-ft)
Maximum
Maximum
Water
Pond Storage
Surface
(ac-ft)
Elevation
(ft)
Infiltration
Ft. Bragg, NC
10
0.098
12.100
1.10
(N/A)
(N/A)
Basin 2 (IN)
- , 10 yrs
Infiltration
Ft. Bragg, NC
Basin 2
10 yrs
10
0.000
0.000
0.00
298.43
0.041
(OUT)
Infiltration
Ft. Bragg, NC
25
0.143
12.100
1.68
(N/A)
(N/A)
Basin 2 (IN)
- , 25 yrs
Infiltration
Ft. Bragg, NC
Basin 2
25 yrs
25
0.015
12.600
0.25
298.77
0.057
(OUT)
Infiltration
Ft. Bragg, NC
100
0.225
12.100
2.73
(N/A)
(N/A)
Basin 2 (IN)
- , 100 yrs
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Page 70

SOTF DFAC
Subsection:
Master Network Summary
Pond Summary
Label
Scenario
Return
Hydrograph
Time to Peak
Peak Flow
Maximum
Maximum
Event
Volume
(hours)
(ft3/s)
Water
Pond Storage
(years)
(ac-ft)
Surface
(ac-ft)
Elevation
(ft)
Infiltration
Ft. Bragg, NC
Basin 2
100 yrs
100
0.079
12.250
1.64
298.88
0.062
(OUT)
Infiltration
Ft. Bragg, NC
Basin #3
10 yrs
10
0.099
12.100
1.21
(N/A)
(N/A)
(IN)
Infiltration
Ft. Bragg, NC
Basin #3
10 yrs
10
0.010
12.400
0.37
298.78
0.040
(OUT)
Infiltration
Ft. Bragg, NC
Basin #3
25 yrs
25
0.130
12.100
1.58
(N/A)
(N/A)
(IN)
Infiltration
Ft. Bragg, NC
Basin #3
25 yrs
25
0.030
12.200
1.00
298.83
0.041
(OUT)
Infiltration
Ft. Bragg, NC
Basin #3
100 yrs
100
0.182
12.100
2.20
(N/A)
(N/A)
(IN)
Infiltration
Ft. Bragg, NC
Basin #3
,n, ,T%
, 100 yrs
100
0.068
12.150
1.95
298.91
0.044
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Page 5 of 42
Page 71

SOTF DFAC
Subsection: Time -Depth Curve
Label: Ft. Bragg, NC
Time -Depth Curve: TypeIII 24hr (10 yr)
Label TypeIII 24hr (10
yr)
Start Time 0.000 hours
Increment 0.100 hours
End Time 24.000 hours
Return Event 10 years
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
CUMULATIVE RAINFALL (in)
Output Time Increment = 0.100 hours
Time on left represents time for first value in each row.
Time Depth Depth Depth Depth Depth
(hours) (in) (in) (in) (in) (in)
0.000
0.0
0.0
0.0
0.0
0.0
0.500
0.0
0.0
0.0
0.0
0.0
1.000
0.1
0.1
0.1
0.1
0.1
1.500
0.1
0.1
0.1
0.1
0.1
2.000
0.1
0.1
0.1
0.1
0.1
2.500
0.1
0.1
0.1
0.2
0.2
3.000
0.2
0.2
0.2
0.2
0.2
3.500
0.2
0.2
0.2
0.2
0.2
4.000
0.2
0.2
0.2
0.3
0.3
4.500
0.3
0.3
0.3
0.3
0.3
5.000
0.3
0.3
0.3
0.3
0.3
5.500
0.3
0.4
0.4
0.4
0.4
6.000
0.4
0.4
0.4
0.4
0.4
6.500
0.4
0.4
0.5
0.5
0.5
7.000
0.5
0.5
0.5
0.5
0.5
7.500
0.6
0.6
0.6
0.6
0.6
8.000
0.6
0.6
0.6
0.7
0.7
8.500
0.7
0.7
0.7
0.8
0.8
9.000
0.8
0.8
0.8
0.9
0.9
9.500
0.9
0.9
1.0
1.0
1.0
10.000
1.0
1.1
1.1
1.1
1.1
10.500
1.2
1.2
1.2
1.3
1.3
11.000
1.4
1.4
1.4
1.5
1.6
11.500
1.6
1.7
1.8
2.0
2.3
12.000
2.7
3.2
3.4
3.6
3.7
12.500
3.8
3.9
3.9
4.0
4.0
13.000
4.1
4.1
4.2
4.2
4.2
13.500
4.3
4.3
4.3
4.4
4.4
14.000
4.4
4.4
4.5
4.5
4.5
14.500
4.5
4.6
4.6
4.6
4.6
15.000
4.6
4.7
4.7
4.7
4.7
15.500
4.7
4.8
4.8
4.8
4.8
16.000
4.8
4.8
4.8
4.9
4.9
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Page 72

SOTF DFAC
Subsection: Time -Depth Curve
Label: Ft. Bragg, NC
CUMULATIVE RAINFALL (in)
Output Time Increment = 0.100 hours
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Time
on left represents time for first value
in each row.
Time
Depth
Depth
Depth
Depth
Depth
(hours)
(in)
(in)
(in)
(in)
(in)
16.500
4.9
4.9
4.9
4.9
4.9
17.000
4.9
5.0
5.0
5.0
5.0
17.500
5.0
5.0
5.0
5.0
5.0
18.000
5.0
5.1
5.1
5.1
5.1
18.500
5.1
5.1
5.1
5.1
5.1
19.000
5.1
5.1
5.1
5.2
5.2
19.500
5.2
5.2
5.2
5.2
5.2
20.000
5.2
5.2
5.2
5.2
5.2
20.500
5.2
5.2
5.3
5.3
5.3
21.000
5.3
5.3
5.3
5.3
5.3
21.500
5.3
5.3
5.3
5.3
5.3
22.000
5.3
5.3
5.3
5.4
5.4
22.500
5.4
5.4
5.4
5.4
5.4
23.000
5.4
5.4
5.4
5.4
5.4
23.500
5.4
5.4
5.4
5.4
5.4
24.000
5.4
(N/A)
(N/A)
(N/A)
(N/A)
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Page 73

SOTF DFAC
Subsection: Unit Hydrograph Summary
Label: Prop DA #2
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Storm Event TypeIII 24hr (10
yr)
Return Event
10 years
Duration
35.000 hours
Depth
5.4 in
Time of Concentration
0.100 hours
(Composite)
Area (User Defined)
0.830 acres
Computational Time
0.013 hours
Increment
Time to Peak (Computed)
12.120 hours
Flow (Peak, Computed)
1.14 ft3/s
Output Increment
0.050 hours
Time to Flow (Peak
12.100 hours
Interpolated Output)
Flow (Peak Interpolated
1.10 ft3/s
Output)
Drainage Area
SCS CN (Composite)
58.000
Area (User Defined)
0.830 acres
Maximum Retention
7.2 in
(Pervious)
Maximum Retention
1.4 in
(Pervious, 20 percent)
Cumulative Runoff
Cumulative Runoff Depth
1.4 in
(Pervious)
Runoff Volume (Pervious)
0.098 ac-ft
Hydrograph Volume (Area under Hydrograph curve)
Volume
0.098 ac-ft
SCS Unit Hydrograph Parameters
Time of Concentration
0.100 hours
(Composite)
Computational Time
0.013 hours
Increment
Unit Hydrograph Shape
483.432
Factor
K Factor
0.749
Receding/Rising, Tr/Tp
1.670
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Page 8 of 42
Page 74

SOTF DFAC
Subsection: Unit Hydrograph Summary
Label: Prop DA #2
SCS Unit Hydrograph Parameters
Unit peak, qp 9.40 ft3/s
Unit peak time, Tp 0.067 hours
Unit receding limb, Tr 0.267 hours
Total unit time, Tb 0.333 hours
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 9 of 42
Page 75

SOTF DFAC
Subsection: Unit Hydrograph Summary
Label: Prop DA #3
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Storm Event TypeIII 24hr (10
yr)
Return Event
10 years
Duration
35.000 hours
Depth
5.4 in
Time of Concentration
0.100 hours
(Composite)
Area (User Defined)
0.410 acres
Computational Time
0.013 hours
Increment
Time to Peak (Computed)
12.107 hours
Flow (Peak, Computed)
1.22 ft3/s
Output Increment
0.050 hours
Time to Flow (Peak
12.100 hours
Interpolated Output)
Flow (Peak Interpolated
1.21 ft3/s
Output)
Drainage Area
SCS CN (Composite)
76.000
Area (User Defined)
0.410 acres
Maximum Retention
3.2 in
(Pervious)
Maximum Retention
0.6 in
(Pervious, 20 percent)
Cumulative Runoff
Cumulative Runoff Depth
2.9 in
(Pervious)
Runoff Volume (Pervious)
0.099 ac-ft
Hydrograph Volume (Area under Hydrograph curve)
Volume
0.099 ac-ft
SCS Unit Hydrograph Parameters
Time of Concentration
0.100 hours
(Composite)
Computational Time
0.013 hours
Increment
Unit Hydrograph Shape
483.432
Factor
K Factor
0.749
Receding/Rising, Tr/Tp
1.670
Bentley Systems, Inc.
Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc
Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 10 of 42
Page 76

SOTF DFAC
Subsection: Unit Hydrograph Summary
Label: Prop DA #3
SCS Unit Hydrograph Parameters
Unit peak, qp 4.65 ft3/s
Unit peak time, Tp 0.067 hours
Unit receding limb, Tr 0.267 hours
Total unit time, Tb 0.333 hours
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 11 of 42
Page 77

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin #3 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time Elevation Elevation Elevation Elevation Elevation
(hours) (ft) (ft) (ft) (ft) (ft)
0.000
297.25
297.25
297.25
297.25
297.25
0.250
297.25
297.25
297.25
297.25
297.25
0.500
297.25
297.25
297.25
297.25
297.25
0.750
297.25
297.25
297.25
297.25
297.25
1.000
297.25
297.25
297.25
297.25
297.25
1.250
297.25
297.25
297.25
297.25
297.25
1.500
297.25
297.25
297.25
297.25
297.25
1.750
297.25
297.25
297.25
297.25
297.25
2.000
297.25
297.25
297.25
297.25
297.25
2.250
297.25
297.25
297.25
297.25
297.25
2.500
297.25
297.25
297.25
297.25
297.25
2.750
297.25
297.25
297.25
297.25
297.25
3.000
297.25
297.25
297.25
297.25
297.25
3.250
297.25
297.25
297.25
297.25
297.25
3.500
297.25
297.25
297.25
297.25
297.25
3.750
297.25
297.25
297.25
297.25
297.25
4.000
297.25
297.25
297.25
297.25
297.25
4.250
297.25
297.25
297.25
297.25
297.25
4.500
297.25
297.25
297.25
297.25
297.25
4.750
297.25
297.25
297.25
297.25
297.25
5.000
297.25
297.25
297.25
297.25
297.25
5.250
297.25
297.25
297.25
297.25
297.25
5.500
297.25
297.25
297.25
297.25
297.25
5.750
297.25
297.25
297.25
297.25
297.25
6.000
297.25
297.25
297.25
297.25
297.25
6.250
297.25
297.25
297.25
297.25
297.25
6.500
297.25
297.25
297.25
297.25
297.25
6.750
297.25
297.25
297.25
297.25
297.25
7.000
297.25
297.25
297.25
297.25
297.25
7.250
297.25
297.25
297.25
297.25
297.25
7.500
297.25
297.25
297.25
297.25
297.25
7.750
297.25
297.25
297.25
297.25
297.25
8.000
297.25
297.25
297.25
297.25
297.25
8.250
297.25
297.25
297.25
297.25
297.25
8.500
297.25
297.25
297.25
297.25
297.25
8.750
297.25
297.26
297.26
297.26
297.26
9.000
297.26
297.26
297.26
297.26
297.26
9.250
297.27
297.27
297.27
297.27
297.27
9.500
297.28
297.28
297.28
297.28
297.28
9.750
297.29
297.29
297.29
297.30
297.30
10.000
297.30
297.30
297.31
297.31
297.31
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 12 of 42
Page 78

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin #3 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
10.250
297.32
297.32
297.33
297.33
297.33
10.500
297.34
297.34
297.35
297.35
297.36
10.750
297.36
297.37
297.38
297.38
297.39
11.000
297.40
297.40
297.41
297.42
297.43
11.250
297.44
297.45
297.46
297.47
297.48
11.500
297.49
297.51
297.53
297.55
297.59
11.750
297.63
297.68
297.75
297.81
297.89
12.000
298.02
298.17
298.33
298.47
298.58
12.250
298.67
298.74
298.77
298.78
298.78
12.500
298.77
298.77
298.76
298.76
298.76
12.750
298.76
298.76
298.75
298.75
298.75
13.000
298.75
298.75
298.75
298.75
298.75
13.250
298.75
298.75
298.75
298.75
298.75
13.500
298.75
298.75
298.75
298.75
298.75
13.750
298.75
298.75
298.75
298.75
298.74
14.000
298.74
298.74
298.74
298.74
298.73
14.250
298.73
298.73
298.72
298.72
298.72
14.500
298.71
298.71
298.71
298.70
298.70
14.750
298.70
298.69
298.69
298.68
298.68
15.000
298.68
298.67
298.67
298.66
298.66
15.250
298.65
298.65
298.64
298.64
298.63
15.500
298.63
298.62
298.61
298.61
298.60
15.750
298.60
298.59
298.59
298.58
298.57
16.000
298.57
298.56
298.55
298.55
298.54
16.250
298.53
298.53
298.52
298.51
298.51
16.500
298.50
298.49
298.49
298.48
298.47
16.750
298.47
298.46
298.45
298.44
298.44
17.000
298.43
298.42
298.42
298.41
298.40
17.250
298.40
298.39
298.38
298.37
298.37
17.500
298.36
298.35
298.35
298.34
298.33
17.750
298.32
298.32
298.31
298.30
298.29
18.000
298.29
298.28
298.27
298.27
298.26
18.250
298.25
298.24
298.23
298.22
298.21
18.500
298.21
298.20
298.19
298.18
298.17
18.750
298.16
298.15
298.14
298.13
298.12
19.000
298.12
298.11
298.10
298.09
298.08
19.250
298.07
298.06
298.06
298.05
298.04
19.500
298.03
298.02
298.01
298.00
298.00
19.750
297.99
297.98
297.97
297.96
297.95
20.000
297.95
297.94
297.93
297.92
297.91
20.250
297.90
297.90
297.89
297.88
297.87
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #2&3.ppc Center [08.11.01.56]
5/6/2019 27 Siemon Company Drive Suite 200 W Page 13 of 42
Watertown, CT 06795 USA + 1 -203-755-1666
Page 79

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin #3 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
20.500
297.86
297.86
297.85
297.84
297.83
20.750
297.82
297.82
297.81
297.80
297.79
21.000
297.79
297.78
297.77
297.76
297.76
21.250
297.75
297.74
297.73
297.72
297.71
21.500
297.70
297.70
297.69
297.68
297.67
21.750
297.66
297.66
297.65
297.64
297.64
22.000
297.63
297.62
297.62
297.61
297.61
22.250
297.60
297.59
297.59
297.58
297.58
22.500
297.57
297.57
297.56
297.56
297.55
22.750
297.55
297.55
297.54
297.54
297.53
23.000
297.53
297.52
297.52
297.52
297.51
23.250
297.51
297.51
297.50
297.50
297.50
23.500
297.49
297.49
297.49
297.48
297.48
23.750
297.48
297.47
297.47
297.47
297.47
24.000
297.46
297.46
297.46
297.45
297.45
24.250
297.44
297.44
297.43
297.43
297.42
24.500
297.42
297.41
297.41
297.40
297.40
24.750
297.39
297.39
297.39
297.38
297.38
25.000
297.38
297.37
297.37
297.37
297.36
25.250
297.36
297.36
297.35
297.35
297.35
25.500
297.34
297.34
297.34
297.34
297.33
25.750
297.33
297.33
297.33
297.33
297.32
26.000
297.32
297.32
297.32
297.32
297.31
26.250
297.31
297.31
297.31
297.31
297.31
26.500
297.30
297.30
297.30
297.30
297.30
26.750
297.30
297.30
297.29
297.29
297.29
27.000
297.29
297.29
297.29
297.29
297.29
27.250
297.29
297.28
297.28
297.28
297.28
27.500
297.28
297.28
297.28
297.28
297.28
27.750
297.28
297.28
297.28
297.27
297.27
28.000
297.27
297.27
297.27
297.27
297.27
28.250
297.27
297.27
297.27
297.27
297.27
28.500
297.27
297.27
297.27
297.27
297.27
28.750
297.27
297.27
297.26
297.26
297.26
29.000
297.26
297.26
297.26
297.26
297.26
29.250
297.26
297.26
297.26
297.26
297.26
29.500
297.26
297.26
297.26
297.26
297.26
29.750
297.26
297.26
297.26
297.26
297.26
30.000
297.26
297.26
297.26
297.26
297.26
30.250
297.26
297.26
297.26
297.26
297.26
30.500
297.26
297.26
297.26
297.26
297.26
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #2&3.ppc Center [08.11.01.56]
5/6/2019 27 Siemon Company Drive Suite 200 W Page 14 of 42
Watertown, CT 06795 USA + 1 -203-755-1666
Page 80

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin #3 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
30.750
297.26
297.25
297.25
297.25
297.25
31.000
297.25
297.25
297.25
297.25
297.25
31.250
297.25
297.25
297.25
297.25
297.25
31.500
297.25
297.25
297.25
297.25
297.25
31.750
297.25
297.25
297.25
297.25
297.25
32.000
297.25
297.25
297.25
297.25
297.25
32.250
297.25
297.25
297.25
297.25
297.25
32.500
297.25
297.25
297.25
297.25
297.25
32.750
297.25
297.25
297.25
297.25
297.25
33.000
297.25
297.25
297.25
297.25
297.25
33.250
297.25
297.25
297.25
297.25
297.25
33.500
297.25
297.25
297.25
297.25
297.25
33.750
297.25
297.25
297.25
297.25
297.25
34.000
297.25
297.25
297.25
297.25
297.25
34.250
297.25
297.25
297.25
297.25
297.25
34.500
297.25
297.25
297.25
297.25
297.25
34.750
297.25
297.25
297.25
297.25
297.25
35.000
297.25
(N/A)
(N/A)
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 15 of 42
Page 81

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 2 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time Elevation Elevation Elevation Elevation Elevation
(hours) (ft) (ft) (ft) (ft) (ft)
0.000
297.25
297.25
297.25
297.25
297.25
0.250
297.25
297.25
297.25
297.25
297.25
0.500
297.25
297.25
297.25
297.25
297.25
0.750
297.25
297.25
297.25
297.25
297.25
1.000
297.25
297.25
297.25
297.25
297.25
1.250
297.25
297.25
297.25
297.25
297.25
1.500
297.25
297.25
297.25
297.25
297.25
1.750
297.25
297.25
297.25
297.25
297.25
2.000
297.25
297.25
297.25
297.25
297.25
2.250
297.25
297.25
297.25
297.25
297.25
2.500
297.25
297.25
297.25
297.25
297.25
2.750
297.25
297.25
297.25
297.25
297.25
3.000
297.25
297.25
297.25
297.25
297.25
3.250
297.25
297.25
297.25
297.25
297.25
3.500
297.25
297.25
297.25
297.25
297.25
3.750
297.25
297.25
297.25
297.25
297.25
4.000
297.25
297.25
297.25
297.25
297.25
4.250
297.25
297.25
297.25
297.25
297.25
4.500
297.25
297.25
297.25
297.25
297.25
4.750
297.25
297.25
297.25
297.25
297.25
5.000
297.25
297.25
297.25
297.25
297.25
5.250
297.25
297.25
297.25
297.25
297.25
5.500
297.25
297.25
297.25
297.25
297.25
5.750
297.25
297.25
297.25
297.25
297.25
6.000
297.25
297.25
297.25
297.25
297.25
6.250
297.25
297.25
297.25
297.25
297.25
6.500
297.25
297.25
297.25
297.25
297.25
6.750
297.25
297.25
297.25
297.25
297.25
7.000
297.25
297.25
297.25
297.25
297.25
7.250
297.25
297.25
297.25
297.25
297.25
7.500
297.25
297.25
297.25
297.25
297.25
7.750
297.25
297.25
297.25
297.25
297.25
8.000
297.25
297.25
297.25
297.25
297.25
8.250
297.25
297.25
297.25
297.25
297.25
8.500
297.25
297.25
297.25
297.25
297.25
8.750
297.25
297.25
297.25
297.25
297.25
9.000
297.25
297.25
297.25
297.25
297.25
9.250
297.25
297.25
297.25
297.25
297.25
9.500
297.25
297.25
297.25
297.25
297.25
9.750
297.25
297.25
297.25
297.25
297.25
10.000
297.25
297.25
297.25
297.25
297.25
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 16 of 42
Page 82

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 2 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
10.250
297.25
297.25
297.25
297.25
297.25
10.500
297.25
297.25
297.25
297.25
297.25
10.750
297.25
297.25
297.25
297.25
297.25
11.000
297.25
297.25
297.25
297.25
297.25
11.250
297.25
297.25
297.25
297.25
297.25
11.500
297.25
297.26
297.26
297.27
297.28
11.750
297.29
297.31
297.33
297.36
297.41
12.000
297.49
297.60
297.73
297.84
297.94
12.250
298.02
298.08
298.14
298.19
298.23
12.500
298.26
298.28
298.30
298.31
298.32
12.750
298.33
298.34
298.35
298.36
298.37
13.000
298.37
298.38
298.38
298.39
298.39
13.250
298.39
298.40
298.40
298.40
298.41
13.500
298.41
298.41
298.42
298.42
298.42
13.750
298.42
298.42
298.42
298.43
298.43
14.000
298.43
298.43
298.43
298.43
298.43
14.250
298.43
298.43
298.43
298.43
298.43
14.500
298.43
298.43
298.42
298.42
298.42
14.750
298.42
298.42
298.42
298.42
298.42
15.000
298.41
298.41
298.41
298.41
298.41
15.250
298.40
298.40
298.40
298.40
298.39
15.500
298.39
298.39
298.39
298.38
298.38
15.750
298.38
298.37
298.37
298.37
298.36
16.000
298.36
298.36
298.35
298.35
298.34
16.250
298.34
298.34
298.33
298.33
298.32
16.500
298.32
298.31
298.31
298.31
298.30
16.750
298.30
298.29
298.29
298.28
298.28
17.000
298.27
298.27
298.26
298.26
298.25
17.250
298.25
298.24
298.24
298.23
298.23
17.500
298.22
298.21
298.21
298.20
298.20
17.750
298.19
298.18
298.18
298.17
298.16
18.000
298.16
298.15
298.15
298.14
298.13
18.250
298.13
298.12
298.11
298.11
298.10
18.500
298.09
298.09
298.08
298.07
298.07
18.750
298.06
298.05
298.05
298.04
298.04
19.000
298.03
298.02
298.02
298.01
298.00
19.250
298.00
297.99
297.98
297.98
297.97
19.500
297.97
297.96
297.95
297.95
297.94
19.750
297.93
297.93
297.92
297.92
297.91
20.000
297.90
297.90
297.89
297.88
297.88
20.250
297.87
297.87
297.86
297.85
297.85
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #2&3.ppc Center [08.11.01.56]
5/6/2019 27 Siemon Company Drive Suite 200 W Page 17 of 42
Watertown, CT 06795 USA + 1 -203-755-1666
Page 83

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 2 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
20.500
297.84
297.83
297.83
297.82
297.82
20.750
297.81
297.80
297.80
297.79
297.79
21.000
297.78
297.77
297.77
297.76
297.76
21.250
297.75
297.74
297.73
297.73
297.72
21.500
297.71
297.71
297.70
297.69
297.69
21.750
297.68
297.68
297.67
297.67
297.66
22.000
297.65
297.65
297.64
297.64
297.63
22.250
297.63
297.62
297.62
297.61
297.61
22.500
297.60
297.60
297.60
297.59
297.59
22.750
297.58
297.58
297.58
297.57
297.57
23.000
297.56
297.56
297.56
297.55
297.55
23.250
297.55
297.54
297.54
297.54
297.53
23.500
297.53
297.53
297.52
297.52
297.52
23.750
297.51
297.51
297.51
297.51
297.50
24.000
297.50
297.50
297.49
297.49
297.48
24.250
297.48
297.47
297.47
297.46
297.46
24.500
297.45
297.45
297.44
297.44
297.43
24.750
297.43
297.43
297.42
297.42
297.41
25.000
297.41
297.41
297.40
297.40
297.40
25.250
297.39
297.39
297.39
297.38
297.38
25.500
297.38
297.37
297.37
297.37
297.37
25.750
297.36
297.36
297.36
297.36
297.35
26.000
297.35
297.35
297.35
297.34
297.34
26.250
297.34
297.34
297.34
297.33
297.33
26.500
297.33
297.33
297.33
297.33
297.32
26.750
297.32
297.32
297.32
297.32
297.32
27.000
297.31
297.31
297.31
297.31
297.31
27.250
297.31
297.31
297.30
297.30
297.30
27.500
297.30
297.30
297.30
297.30
297.30
27.750
297.30
297.29
297.29
297.29
297.29
28.000
297.29
297.29
297.29
297.29
297.29
28.250
297.29
297.29
297.28
297.28
297.28
28.500
297.28
297.28
297.28
297.28
297.28
28.750
297.28
297.28
297.28
297.28
297.28
29.000
297.28
297.27
297.27
297.27
297.27
29.250
297.27
297.27
297.27
297.27
297.27
29.500
297.27
297.27
297.27
297.27
297.27
29.750
297.27
297.27
297.27
297.27
297.27
30.000
297.27
297.27
297.27
297.26
297.26
30.250
297.26
297.26
297.26
297.26
297.26
30.500
297.26
297.26
297.26
297.26
297.26
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #2&3.ppc Center [08.11.01.56]
5/6/2019 27 Siemon Company Drive Suite 200 W Page 18 of 42
Watertown, CT 06795 USA + 1 -203-755-1666
Page 84

SOTF DFAC
Subsection: Time vs. Elevation Return Event: 10 years
Label: Infiltration Basin 2 (IN) Storm Event: TypeIII 24hr (10 yr)
Time vs. Elevation (ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Elevation
Elevation
Elevation
Elevation
Elevation
(hours)
(ft)
(ft)
(ft)
(ft)
(ft)
30.750
297.26
297.26
297.26
297.26
297.26
31.000
297.26
297.26
297.26
297.26
297.26
31.250
297.26
297.26
297.26
297.26
297.26
31.500
297.26
297.26
297.26
297.26
297.26
31.750
297.26
297.26
297.26
297.26
297.26
32.000
297.26
297.26
297.26
297.26
297.26
32.250
297.26
297.26
297.26
297.26
297.26
32.500
297.26
297.25
297.25
297.25
297.25
32.750
297.25
297.25
297.25
297.25
297.25
33.000
297.25
297.25
297.25
297.25
297.25
33.250
297.25
297.25
297.25
297.25
297.25
33.500
297.25
297.25
297.25
297.25
297.25
33.750
297.25
297.25
297.25
297.25
297.25
34.000
297.25
297.25
297.25
297.25
297.25
34.250
297.25
297.25
297.25
297.25
297.25
34.500
297.25
297.25
297.25
297.25
297.25
34.750
297.25
297.25
297.25
297.25
297.25
35.000
297.25
(N/A)
(N/A)
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 19 of 42
Page 85

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin #3 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time Volume Volume Volume Volume Volume
(hours) (ac-ft) (ac-ft) (ac-ft) (ac-ft) (ac-ft)
0.000
0.000
0.000
0.000
0.000
0.000
0.250
0.000
0.000
0.000
0.000
0.000
0.500
0.000
0.000
0.000
0.000
0.000
0.750
0.000
0.000
0.000
0.000
0.000
1.000
0.000
0.000
0.000
0.000
0.000
1.250
0.000
0.000
0.000
0.000
0.000
1.500
0.000
0.000
0.000
0.000
0.000
1.750
0.000
0.000
0.000
0.000
0.000
2.000
0.000
0.000
0.000
0.000
0.000
2.250
0.000
0.000
0.000
0.000
0.000
2.500
0.000
0.000
0.000
0.000
0.000
2.750
0.000
0.000
0.000
0.000
0.000
3.000
0.000
0.000
0.000
0.000
0.000
3.250
0.000
0.000
0.000
0.000
0.000
3.500
0.000
0.000
0.000
0.000
0.000
3.750
0.000
0.000
0.000
0.000
0.000
4.000
0.000
0.000
0.000
0.000
0.000
4.250
0.000
0.000
0.000
0.000
0.000
4.500
0.000
0.000
0.000
0.000
0.000
4.750
0.000
0.000
0.000
0.000
0.000
5.000
0.000
0.000
0.000
0.000
0.000
5.250
0.000
0.000
0.000
0.000
0.000
5.500
0.000
0.000
0.000
0.000
0.000
5.750
0.000
0.000
0.000
0.000
0.000
6.000
0.000
0.000
0.000
0.000
0.000
6.250
0.000
0.000
0.000
0.000
0.000
6.500
0.000
0.000
0.000
0.000
0.000
6.750
0.000
0.000
0.000
0.000
0.000
7.000
0.000
0.000
0.000
0.000
0.000
7.250
0.000
0.000
0.000
0.000
0.000
7.500
0.000
0.000
0.000
0.000
0.000
7.750
0.000
0.000
0.000
0.000
0.000
8.000
0.000
0.000
0.000
0.000
0.000
8.250
0.000
0.000
0.000
0.000
0.000
8.500
0.000
0.000
0.000
0.000
0.000
8.750
0.000
0.000
0.000
0.000
0.000
9.000
0.000
0.000
0.000
0.000
0.000
9.250
0.000
0.000
0.000
0.000
0.000
9.500
0.000
0.001
0.001
0.001
0.001
9.750
0.001
0.001
0.001
0.001
0.001
10.000
0.001
0.001
0.001
0.001
0.001
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 20 of 42
Page 86

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin #3 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
10.250
0.001
0.001
0.001
0.001
0.002
10.500
0.002
0.002
0.002
0.002
0.002
10.750
0.002
0.002
0.002
0.002
0.003
11.000
0.003
0.003
0.003
0.003
0.003
11.250
0.003
0.004
0.004
0.004
0.004
11.500
0.005
0.005
0.005
0.006
0.007
11.750
0.007
0.009
0.010
0.012
0.013
12.000
0.016
0.021
0.025
0.029
0.033
12.250
0.036
0.038
0.039
0.040
0.039
12.500
0.039
0.039
0.039
0.039
0.039
12.750
0.039
0.039
0.039
0.039
0.039
13.000
0.039
0.039
0.039
0.039
0.039
13.250
0.039
0.039
0.039
0.039
0.039
13.500
0.039
0.039
0.039
0.039
0.038
13.750
0.038
0.038
0.038
0.038
0.038
14.000
0.038
0.038
0.038
0.038
0.038
14.250
0.038
0.038
0.038
0.037
0.037
14.500
0.037
0.037
0.037
0.037
0.037
14.750
0.037
0.037
0.036
0.036
0.036
15.000
0.036
0.036
0.036
0.035
0.035
15.250
0.035
0.035
0.035
0.035
0.034
15.500
0.034
0.034
0.034
0.034
0.034
15.750
0.033
0.033
0.033
0.033
0.033
16.000
0.032
0.032
0.032
0.032
0.031
16.250
0.031
0.031
0.031
0.031
0.030
16.500
0.030
0.030
0.030
0.030
0.029
16.750
0.029
0.029
0.029
0.028
0.028
17.000
0.028
0.028
0.028
0.027
0.027
17.250
0.027
0.027
0.027
0.026
0.026
17.500
0.026
0.026
0.025
0.025
0.025
17.750
0.025
0.025
0.024
0.024
0.024
18.000
0.024
0.024
0.023
0.023
0.023
18.250
0.023
0.022
0.022
0.022
0.022
18.500
0.021
0.021
0.021
0.021
0.020
18.750
0.020
0.020
0.020
0.020
0.019
19.000
0.019
0.019
0.019
0.018
0.018
19.250
0.018
0.018
0.017
0.017
0.017
19.500
0.017
0.017
0.016
0.016
0.016
19.750
0.016
0.016
0.015
0.015
0.015
20.000
0.015
0.015
0.014
0.014
0.014
20.250
0.014
0.014
0.013
0.013
0.013
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #2&3.ppc Center [08.11.01.56]
5/6/2019 27 Siemon Company Drive Suite 200 W Page 21 of 42
Watertown, CT 06795 USA + 1 -203-755-1666
Page 87

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin #3 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
20.500
0.013
0.013
0.012
0.012
0.012
20.750
0.012
0.012
0.011
0.011
0.011
21.000
0.011
0.011
0.011
0.010
0.010
21.250
0.010
0.010
0.010
0.009
0.009
21.500
0.009
0.009
0.009
0.009
0.008
21.750
0.008
0.008
0.008
0.008
0.008
22.000
0.007
0.007
0.007
0.007
0.007
22.250
0.007
0.007
0.007
0.006
0.006
22.500
0.006
0.006
0.006
0.006
0.006
22.750
0.006
0.006
0.006
0.006
0.005
23.000
0.005
0.005
0.005
0.005
0.005
23.250
0.005
0.005
0.005
0.005
0.005
23.500
0.005
0.005
0.004
0.004
0.004
23.750
0.004
0.004
0.004
0.004
0.004
24.000
0.004
0.004
0.004
0.004
0.004
24.250
0.004
0.003
0.003
0.003
0.003
24.500
0.003
0.003
0.003
0.003
0.003
24.750
0.003
0.003
0.003
0.002
0.002
25.000
0.002
0.002
0.002
0.002
0.002
25.250
0.002
0.002
0.002
0.002
0.002
25.500
0.002
0.002
0.002
0.002
0.002
25.750
0.002
0.001
0.001
0.001
0.001
26.000
0.001
0.001
0.001
0.001
0.001
26.250
0.001
0.001
0.001
0.001
0.001
26.500
0.001
0.001
0.001
0.001
0.001
26.750
0.001
0.001
0.001
0.001
0.001
27.000
0.001
0.001
0.001
0.001
0.001
27.250
0.001
0.001
0.001
0.001
0.001
27.500
0.001
0.001
0.001
0.001
0.001
27.750
0.000
0.000
0.000
0.000
0.000
28.000
0.000
0.000
0.000
0.000
0.000
28.250
0.000
0.000
0.000
0.000
0.000
28.500
0.000
0.000
0.000
0.000
0.000
28.750
0.000
0.000
0.000
0.000
0.000
29.000
0.000
0.000
0.000
0.000
0.000
29.250
0.000
0.000
0.000
0.000
0.000
29.500
0.000
0.000
0.000
0.000
0.000
29.750
0.000
0.000
0.000
0.000
0.000
30.000
0.000
0.000
0.000
0.000
0.000
30.250
0.000
0.000
0.000
0.000
0.000
30.500
0.000
0.000
0.000
0.000
0.000
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #2&3.ppc Center [08.11.01.56]
5/6/2019 27 Siemon Company Drive Suite 200 W Page 22 of 42
Watertown, CT 06795 USA + 1 -203-755-1666
Page 88

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin #3 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
30.750
0.000
0.000
0.000
0.000
0.000
31.000
0.000
0.000
0.000
0.000
0.000
31.250
0.000
0.000
0.000
0.000
0.000
31.500
0.000
0.000
0.000
0.000
0.000
31.750
0.000
0.000
0.000
0.000
0.000
32.000
0.000
0.000
0.000
0.000
0.000
32.250
0.000
0.000
0.000
0.000
0.000
32.500
0.000
0.000
0.000
0.000
0.000
32.750
0.000
0.000
0.000
0.000
0.000
33.000
0.000
0.000
0.000
0.000
0.000
33.250
0.000
0.000
0.000
0.000
0.000
33.500
0.000
0.000
0.000
0.000
0.000
33.750
0.000
0.000
0.000
0.000
0.000
34.000
0.000
0.000
0.000
0.000
0.000
34.250
0.000
0.000
0.000
0.000
0.000
34.500
0.000
0.000
0.000
0.000
0.000
34.750
0.000
0.000
0.000
0.000
0.000
35.000
0.000
(N/A)
(N/A)
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 23 of 42
Page 89

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 2 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time Volume Volume Volume Volume Volume
(hours) (ac-ft) (ac-ft) (ac-ft) (ac-ft) (ac-ft)
0.000
0.000
0.000
0.000
0.000
0.000
0.250
0.000
0.000
0.000
0.000
0.000
0.500
0.000
0.000
0.000
0.000
0.000
0.750
0.000
0.000
0.000
0.000
0.000
1.000
0.000
0.000
0.000
0.000
0.000
1.250
0.000
0.000
0.000
0.000
0.000
1.500
0.000
0.000
0.000
0.000
0.000
1.750
0.000
0.000
0.000
0.000
0.000
2.000
0.000
0.000
0.000
0.000
0.000
2.250
0.000
0.000
0.000
0.000
0.000
2.500
0.000
0.000
0.000
0.000
0.000
2.750
0.000
0.000
0.000
0.000
0.000
3.000
0.000
0.000
0.000
0.000
0.000
3.250
0.000
0.000
0.000
0.000
0.000
3.500
0.000
0.000
0.000
0.000
0.000
3.750
0.000
0.000
0.000
0.000
0.000
4.000
0.000
0.000
0.000
0.000
0.000
4.250
0.000
0.000
0.000
0.000
0.000
4.500
0.000
0.000
0.000
0.000
0.000
4.750
0.000
0.000
0.000
0.000
0.000
5.000
0.000
0.000
0.000
0.000
0.000
5.250
0.000
0.000
0.000
0.000
0.000
5.500
0.000
0.000
0.000
0.000
0.000
5.750
0.000
0.000
0.000
0.000
0.000
6.000
0.000
0.000
0.000
0.000
0.000
6.250
0.000
0.000
0.000
0.000
0.000
6.500
0.000
0.000
0.000
0.000
0.000
6.750
0.000
0.000
0.000
0.000
0.000
7.000
0.000
0.000
0.000
0.000
0.000
7.250
0.000
0.000
0.000
0.000
0.000
7.500
0.000
0.000
0.000
0.000
0.000
7.750
0.000
0.000
0.000
0.000
0.000
8.000
0.000
0.000
0.000
0.000
0.000
8.250
0.000
0.000
0.000
0.000
0.000
8.500
0.000
0.000
0.000
0.000
0.000
8.750
0.000
0.000
0.000
0.000
0.000
9.000
0.000
0.000
0.000
0.000
0.000
9.250
0.000
0.000
0.000
0.000
0.000
9.500
0.000
0.000
0.000
0.000
0.000
9.750
0.000
0.000
0.000
0.000
0.000
10.000
0.000
0.000
0.000
0.000
0.000
Bentley Systems, Inc. Haestad Methods Solution
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[08.11.01.56]
Page 24 of 42
Page 90

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 2 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
10.250
0.000
0.000
0.000
0.000
0.000
10.500
0.000
0.000
0.000
0.000
0.000
10.750
0.000
0.000
0.000
0.000
0.000
11.000
0.000
0.000
0.000
0.000
0.000
11.250
0.000
0.000
0.000
0.000
0.000
11.500
0.000
0.000
0.000
0.000
0.001
11.750
0.001
0.002
0.002
0.003
0.004
12.000
0.007
0.010
0.014
0.018
0.022
12.250
0.024
0.027
0.029
0.031
0.033
12.500
0.034
0.035
0.036
0.036
0.037
12.750
0.037
0.037
0.038
0.038
0.038
13.000
0.039
0.039
0.039
0.039
0.039
13.250
0.040
0.040
0.040
0.040
0.040
13.500
0.040
0.040
0.040
0.041
0.041
13.750
0.041
0.041
0.041
0.041
0.041
14.000
0.041
0.041
0.041
0.041
0.041
14.250
0.041
0.041
0.041
0.041
0.041
14.500
0.041
0.041
0.041
0.041
0.041
14.750
0.041
0.041
0.041
0.041
0.040
15.000
0.040
0.040
0.040
0.040
0.040
15.250
0.040
0.040
0.040
0.040
0.040
15.500
0.039
0.039
0.039
0.039
0.039
15.750
0.039
0.039
0.039
0.038
0.038
16.000
0.038
0.038
0.038
0.038
0.037
16.250
0.037
0.037
0.037
0.037
0.037
16.500
0.036
0.036
0.036
0.036
0.036
16.750
0.035
0.035
0.035
0.035
0.035
17.000
0.035
0.034
0.034
0.034
0.034
17.250
0.034
0.033
0.033
0.033
0.033
17.500
0.032
0.032
0.032
0.032
0.031
17.750
0.031
0.031
0.031
0.030
0.030
18.000
0.030
0.030
0.029
0.029
0.029
18.250
0.029
0.028
0.028
0.028
0.028
18.500
0.027
0.027
0.027
0.027
0.026
18.750
0.026
0.026
0.026
0.025
0.025
19.000
0.025
0.025
0.025
0.024
0.024
19.250
0.024
0.024
0.023
0.023
0.023
19.500
0.023
0.022
0.022
0.022
0.022
19.750
0.022
0.021
0.021
0.021
0.021
20.000
0.020
0.020
0.020
0.020
0.019
20.250
0.019
0.019
0.019
0.019
0.018
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
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Page 91

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 2 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
20.500
0.018
0.018
0.018
0.018
0.017
20.750
0.017
0.017
0.017
0.017
0.016
21.000
0.016
0.016
0.016
0.015
0.015
21.250
0.015
0.015
0.015
0.014
0.014
21.500
0.014
0.014
0.013
0.013
0.013
21.750
0.013
0.013
0.012
0.012
0.012
22.000
0.012
0.012
0.012
0.011
0.011
22.250
0.011
0.011
0.011
0.011
0.011
22.500
0.010
0.010
0.010
0.010
0.010
22.750
0.010
0.010
0.009
0.009
0.009
23.000
0.009
0.009
0.009
0.009
0.009
23.250
0.009
0.008
0.008
0.008
0.008
23.500
0.008
0.008
0.008
0.008
0.008
23.750
0.008
0.007
0.007
0.007
0.007
24.000
0.007
0.007
0.007
0.007
0.007
24.250
0.006
0.006
0.006
0.006
0.006
24.500
0.006
0.006
0.005
0.005
0.005
24.750
0.005
0.005
0.005
0.005
0.005
25.000
0.004
0.004
0.004
0.004
0.004
25.250
0.004
0.004
0.004
0.004
0.004
25.500
0.004
0.003
0.003
0.003
0.003
25.750
0.003
0.003
0.003
0.003
0.003
26.000
0.003
0.003
0.003
0.003
0.003
26.250
0.002
0.002
0.002
0.002
0.002
26.500
0.002
0.002
0.002
0.002
0.002
26.750
0.002
0.002
0.002
0.002
0.002
27.000
0.002
0.002
0.002
0.002
0.002
27.250
0.002
0.002
0.001
0.001
0.001
27.500
0.001
0.001
0.001
0.001
0.001
27.750
0.001
0.001
0.001
0.001
0.001
28.000
0.001
0.001
0.001
0.001
0.001
28.250
0.001
0.001
0.001
0.001
0.001
28.500
0.001
0.001
0.001
0.001
0.001
28.750
0.001
0.001
0.001
0.001
0.001
29.000
0.001
0.001
0.001
0.001
0.001
29.250
0.001
0.001
0.001
0.001
0.001
29.500
0.001
0.001
0.001
0.001
0.001
29.750
0.000
0.000
0.000
0.000
0.000
30.000
0.000
0.000
0.000
0.000
0.000
30.250
0.000
0.000
0.000
0.000
0.000
30.500
0.000
0.000
0.000
0.000
0.000
Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i
SOTF DFAC-Infiltration #2&3.ppc Center [08.11.01.56]
5/6/2019 27 Siemon Company Drive Suite 200 W Page 26 of 42
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Page 92

SOTF DFAC
Subsection: Time vs. Volume Return Event: 10 years
Label: Infiltration Basin 2 Storm Event: TypeIII 24hr (10 yr)
Time vs. Volume (ac-ft)
Output Time increment = 0.050 hours
Time on left represents time for first value in each row.
Time
Volume
Volume
Volume
Volume
Volume
(hours)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
(ac-ft)
30.750
0.000
0.000
0.000
0.000
0.000
31.000
0.000
0.000
0.000
0.000
0.000
31.250
0.000
0.000
0.000
0.000
0.000
31.500
0.000
0.000
0.000
0.000
0.000
31.750
0.000
0.000
0.000
0.000
0.000
32.000
0.000
0.000
0.000
0.000
0.000
32.250
0.000
0.000
0.000
0.000
0.000
32.500
0.000
0.000
0.000
0.000
0.000
32.750
0.000
0.000
0.000
0.000
0.000
33.000
0.000
0.000
0.000
0.000
0.000
33.250
0.000
0.000
0.000
0.000
0.000
33.500
0.000
0.000
0.000
0.000
0.000
33.750
0.000
0.000
0.000
0.000
0.000
34.000
0.000
0.000
0.000
0.000
0.000
34.250
0.000
0.000
0.000
0.000
0.000
34.500
0.000
0.000
0.000
0.000
0.000
34.750
0.000
0.000
0.000
0.000
0.000
35.000
0.000
(N/A)
(N/A)
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
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Bentley PondPack V8i
[08.11.01.56]
Page 27 of 42
Page 93

SOTF DFAC
Subsection: Outlet Input Data
Label: Riser Barrel Outlet
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Requested Pond Water Surface Elevations
Minimum (Headwater) 297.25 ft
Increment (Headwater) 0.50 ft
Maximum (Headwater) 299.50 ft
Outlet Connectivity
Structure Type Outlet ID Direction Outfall E1 E2
(ft) (ft)
Barrel
Inlet Box
Riser
Forward
(Outlet
298.75
299.50
Pipe)
Barrel
Culvert -Circular
(Outlet
Forward
TW
297.00
299.50
Pipe)
Tailwater Settings
Tailwater
(N/A)
(N/A)
Bentley Systems, Inc. Haestad Methods Solution
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Page 28 of 42
Page 94

Subsection: Outlet Input Data
Label: Riser Barrel Outlet
SOTF DFAC-Infiltration #2&3.ppc
5/6/2019
SOTF DFAC
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Structure ID: Riser
Structure Type: Inlet Box
Number of Openings
1
Elevation
298.75 ft
Orifice Area
6.0 ftz
Orifice Coefficient
0.600
Weir Length
10.00 ft
Weir Coefficient
3.00 (ft^0.5)/s
K Reverse
1.000
Manning's n
0.000
Kev, Charged Riser
0.000
Weir Submergence
False
Orifice H to crest
False
Structure ID: Barrel (Outlet Pipe)
Structure Type: Culvert -Circular
Number of Barrels
1
Diameter
15.0 in
Length
155.00 ft
Length (Computed Barrel)
155.00 ft
Slope (Computed)
0.006 ft/ft
Outlet Control Data
Manning's n
0.013
Ke
0.500
Kb
0.023
Kr
0.500
Convergence Tolerance
0.00 ft
Inlet Control Data
Equation Form
Form 1
K
0.0098
M
2.0000
C
0.0398
Y
0.6700
T1 ratio (HW/D)
1.157
T2 ratio (HW/D)
1.304
Slope Correction Factor
-0.500
Bentley Systems, Inc. Haestad Methods Solution
Center
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Bentley PondPack V8i
[08.11.01.56]
Page 29 of 42
Page 95

SOTF DFAC
Subsection: Outlet Input Data
Label: Riser Barrel Outlet
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Use unsubmerged inlet control 0 equation below T1
elevation.
Use submerged inlet control 0 equation above T2
elevation
In transition zone between unsubmerged and submerged
inlet control,
interpolate between flows at T1 & T2...
T1 Elevation 298.45 ft T1 Flow 4.80 ft3/s
T2 Elevation 298.63 ft T2 Flow 5.49 ft3/s
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
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[08.11.01.56]
Page 30 of 42
Page 96

Subsection: Outlet Input Data
Label: Riser Barrel Outlet
SOTF DFAC-Infiltration #2&3.ppc
5/6/2019
SOTF DFAC
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Structure ID: TW
Structure Type: TW Setup, DS
Channel
Tailwater Type
Free Outfall
Convergence Tolerances
Maximum Iterations
40
Tailwater Tolerance
0.01 ft
(Minimum)
Tailwater Tolerance
0.50 ft
(Maximum)
Headwater Tolerance
0.01 ft
(Minimum)
Headwater Tolerance
0.50 ft
(Maximum)
Flow Tolerance (Minimum)
0.001 ft3/s
Flow Tolerance (Maximum)
10.000 ft3/s
Bentley Systems, Inc. Haestad Methods Solution
Center
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Bentley PondPack V8i
[08.11.01.56]
Page 31 of 42
Page 97

SOTF DFAC
Subsection: Elevation -Volume -Flow Table (Pond)
Label: Infiltration Basin #3
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
3.0000 in/h
Initial Conditions
Elevation (Water Surface,
297.25 ft
Initial)
Volume (Initial)
0.000 ac-ft
Flow (Initial Outlet)
0.00 ft3/S
Flow (Initial Infiltration)
0.00 ft3/S
Flow (Initial, Total)
0.00 ft3/S
Time Increment
0.050 hours
Elevation Outflow Storage Area
(ft) (ft3/S) (ac-ft) (acres)
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Infiltration Flow (Total) 2S/t + 0
(ft3/S) (ft3/S) (ft3/S)
297.25
0.00
0.000
0.018
0.00
0.00
0.00
297.75
0.00
0.010
0.023
0.07
0.07
4.96
298.25
0.00
0.023
0.028
0.09
0.09
11.07
298.75
0.00
0.039
0.035
0.11
0.11
18.75
299.25
6.19
0.058
0.043
0.13
6.32
34.43
299.50
6.52
0.070
0.048
0.15
6.67
40.31
Bentley Systems, Inc. Haestad Methods Solution
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[08.11.01.56]
Page 32 of 42
Page 98

SOTF DFAC
Subsection: Pond Infiltration Calculations
Label: Infiltration Basin #3 (IN)
Average Infiltration Rating Table
Elevation (Water Area (Total) Flow (Infiltration)
Surface) (ftz) (ft3/s)
(ft)
297.25
784.1
0.00
297.75
981.8
0.07
298.25
1,228.8
0.09
298.75
1,533.7
0.11
299.25
1,889.8
0.13
299.50
2,090.9
0.15
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
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Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 33 of 42
Page 99

SOTF DFAC
Subsection: Detention Time
Label: Infiltration Basin #3 (IN)
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
3.0000 in/h
Approximate Detention Times
Time to Peak (Outflow +
Infiltration, Peak to Peak
12.400 hours
Detention Time)
Time to Peak (Inflow, Peak
12.100 hours
to Peak Detention Time)
Detention Time (Peak to
0.300 hours
Peak)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
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Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 34 of 42
Page 100

SOTF DFAC
Subsection: Level Pool Pond Routing Summary
Label: Infiltration Basin #3 (IN)
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
3.0000 in/h
Initial Conditions
Elevation (Water Surface,
297.25 ft
Initial)
Volume (Initial)
0.000 ac-ft
Flow (Initial Outlet)
0.00 ft3/s
Flow (Initial Infiltration)
0.00 ft3/s
Flow (Initial, Total)
0.00 ft3/s
Time Increment
0.050 hours
Inflow/Outflow Hydrograph Summary
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Flow (Peak In)
1.21 ft3/s
Time to Peak (Flow, In) 12.100 hours
Infiltration (Peak)
0.11 ft3/s
Time to Peak (Infiltration) 12.400 hours
Flow (Peak Outlet)
0.37 ft3/s
Time to Peak (Flow, Outlet) 12.400 hours
Elevation (Water Surface,
298.78 ft
Peak)
Volume (Peak)
0.040 ac-ft
Mass Balance (ac-ft)
Volume (Initial)
0.000 ac-ft
Volume (Total Inflow)
0.099 ac-ft
Volume (Total Infiltration)
0.090 ac-ft
Volume (Total Outlet
0.010 ac-ft
Outflow)
Volume (Retained)
0.000 ac-ft
Volume (Unrouted)
0.000 ac-ft
Error (Mass Balance)
0.0 %
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
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Bentley PondPack V8i
[08.11.01.56]
Page 35 of 42
Page 101

SOTF DFAC
Subsection: Pond Inflow Summary
Label: Infiltration Basin #3 (IN)
Summary for Hydrograph Addition at'Infiltration Basin #3'
Upstream Link Upstream Node
<Catchment to Outflow Node> Prop DA #3
Node Inflows
Inflow Type Element Volume Time to Peak Flow (Peak)
(ac-ft) (hours) (ft3/s)
Flow (From) Prop DA #3 0.099 12.100 1.21
Flow (In) Infiltration 0.099 12.100 1.21
Basin #3
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
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Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 36 of 42
Page 102

SOTF DFAC
Subsection: Elevation -Volume -Flow Table (Pond)
Label: Infiltration Basin 2
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
2.5000 in/h
Initial Conditions
Elevation (Water Surface,
297.25 ft
Initial)
Volume (Initial)
0.000 ac-ft
Flow (Initial Outlet)
0.00 ft3/S
Flow (Initial Infiltration)
0.00 ft3/S
Flow (Initial, Total)
0.00 ft3/S
Time Increment
0.050 hours
Elevation Outflow Storage Area
(ft) (ft3/S) (ac-ft) (acres)
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Infiltration Flow (Total) 2S/t + 0
(ft3/S) (ft3/S) (ft3/S)
297.25
0.00
0.000
0.027
0.00
0.00
0.00
297.75
0.00
0.015
0.033
0.08
0.08
7.39
298.25
0.00
0.034
0.041
0.10
0.10
16.36
298.75
0.00
0.056
0.048
0.12
0.12
27.08
299.25
6.19
0.082
0.056
0.14
6.33
45.86
299.50
6.52
0.096
0.060
0.15
6.67
53.22
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
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Bentley PondPack V8i
[08.11.01.56]
Page 37 of 42
Page 103

SOTF DFAC
Subsection: Pond Infiltration Calculations
Label: Infiltration Basin 2 (IN)
Average Infiltration Rating Table
Elevation (Water Area (Total) Flow (Infiltration)
Surface) (ftz) (ft3/s)
(ft)
297.25
1,176.1
0.00
297.75
1,458.9
0.08
298.25
1,764.7
0.10
298.75
2,091.4
0.12
299.25
2,436.2
0.14
299.50
2,613.6
0.15
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 38 of 42
Page 104

SOTF DFAC
Subsection: Detention Time
Label: Infiltration Basin 2 (IN)
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
2.5000 in/h
Approximate Detention Times
Time to Peak (Outflow +
Infiltration, Peak to Peak
14.200 hours
Detention Time)
Time to Peak (Inflow, Peak
12.100 hours
to Peak Detention Time)
Detention Time (Peak to
2.100 hours
Peak)
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
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Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 39 of 42
Page 105

SOTF DFAC
Subsection: Level Pool Pond Routing Summary
Label: Infiltration Basin 2 (IN)
Infiltration
Infiltration Method
Average
(Computed)
Infiltration Rate
Infiltration Rate (Average)
2.5000 in/h
Initial Conditions
Elevation (Water Surface,
297.25 ft
Initial)
Volume (Initial)
0.000 ac-ft
Flow (Initial Outlet)
0.00 ft3/s
Flow (Initial Infiltration)
0.00 ft3/s
Flow (Initial, Total)
0.00 ft3/s
Time Increment
0.050 hours
Inflow/Outflow Hydrograph Summary
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Flow (Peak In)
1.10 ft3/s
Time to Peak (Flow, In) 12.100 hours
Infiltration (Peak)
0.11 ft3/s
Time to Peak (Infiltration) 14.200 hours
Flow (Peak Outlet)
0.00 ft3/s
Time to Peak (Flow, Outlet) 0.000 hours
Elevation (Water Surface,
298.43 ft
Peak)
Volume (Peak)
0.041 ac-ft
Mass Balance (ac-ft)
Volume (Initial)
0.000 ac-ft
Volume (Total Inflow)
0.098 ac-ft
Volume (Total Infiltration)
0.098 ac-ft
Volume (Total Outlet
0.000 ac-ft
Outflow)
Volume (Retained)
0.000 ac-ft
Volume (Unrouted)
0.000 ac-ft
Error (Mass Balance)
0.0 %
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
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Bentley PondPack V8i
[08.11.01.56]
Page 40 of 42
Page 106

SOTF DFAC
Subsection: Pond Inflow Summary
Label: Infiltration Basin 2 (IN)
Summary for Hydrograph Addition at'Infiltration Basin 2'
Upstream Link
Upstream Node
<Catchment to Outflow Node>
Prop DA #2
Node Inflows
Inflow Type Element
Volume Time to Peak Flow (Peak)
(ac-ft) (hours) (ft3/s)
Flow (From) Prop DA #2
0.098 12.100 1.10
Flow (In) Infiltration
0.098 12.100 1.10
Basin 2
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Return Event: 10 years
Storm Event: TypeIII 24hr (10 yr)
Bentley PondPack V8i
[08.11.01.56]
Page 41 of 42
Page 107

SOTF DFAC
Index
F
Ft. Bragg, NC (Time -Depth Curve, 10 years) ... 6, 7
I
Infiltration Basin #3 (Elevation -Volume -Flow Table (Pond), 10 years) ... 32
Infiltration Basin #3 (IN) (Detention Time, 10 years) ... 34
Infiltration Basin #3 (IN) (Level Pool Pond Routing Summary, 10 years) ... 35
Infiltration Basin #3 (IN) (Pond Infiltration Calculations, 10 years) ... 33
Infiltration Basin #3 (IN) (Pond Inflow Summary, 10 years) ... 36
Infiltration Basin #3 (IN) (Time vs. Elevation, 10 years)...12, 13, 14, 15
Infiltration Basin #3 (Time vs. Volume, 10 years) ... 20, 21, 22, 23
Infiltration Basin 2 (Elevation -Volume -Flow Table (Pond), 10 years) ... 37
Infiltration Basin 2 (IN) (Detention Time, 10 years) ... 39
Infiltration Basin 2 (IN) (Level Pool Pond Routing Summary, 10 years) ... 40
Infiltration Basin 2 (IN) (Pond Infiltration Calculations, 10 years) ... 38
Infiltration Basin 2 (IN) (Pond Inflow Summary, 10 years) ... 41
Infiltration Basin 2 (IN) (Time vs. Elevation, 10 years)...16, 17, 18, 19
Infiltration Basin 2 (Time vs. Volume, 10 years) ... 24, 25, 26, 27
M
Master Network Summary ... 4, 5
P
Prop DA #2 (Unit Hydrograph Summary, 10 years) ... 8, 9
Prop DA #3 (Unit Hydrograph Summary, 10 years) ... 10, 11
R
Riser Barrel Outlet (Outlet Input Data, 10 years) ... 28, 29, 30, 31
U
User Notifications ... 2, 3
Bentley Systems, Inc. Haestad Methods Solution
SOTF DFAC-Infiltration #2&3.ppc Center
5/6/2019 27 Siemon Company Drive Suite 200 W
Watertown, CT 06795 USA + 1 -203-755-1666
Bentley PondPack V8i
[08.11.01.56]
Page 42 of 42
Page 108