Conservation Commission Regular Meeting Materials (linked)

Indigo Land Design, LLC          
860.388.9343 Phone 
40 Elm Street, 2nd Floor           
860.391.8854 Fax 
Old Saybrook, CT 06475           
jwren@Indigo-Land.com E-mail 
 
www.Indigo-Land.com 
 
 
 
July 12, 2022 
Re: 
Ivy Hill Village 
(48 Great Neck Road – Map 145 Lot 2871) 
Waterford, CT 06385 
 
DRAINAGE REPORT 
 
This project involves the construction of 40 detached condominium units (one family & two-family 
buildings) with paved driveways, a two-lane roadway, sidewalks, community amenities, and the 
installation of low impact development (LID) measures, etc. as shown on the site plan, and other 
associated improvements. The subject property currently has a house and barn at the southwest corner. 
There is an existing gravel driveway that provides access to the existing dwelling and an old farm road 
the provides access to the eastern portion of the property. The majority of the site is wooded. 
 
The majority of the proposed buildings will be located east of the wetlands area that bisects the property 
and five proposed buildings will be located west of the wetlands in the vicinity of the existing house, which 
is to be removed. The proposed topography on the eastern portion of the property slopes from the 
highpoint near the eastern (rear) property line to the west toward proposed stormwater management 
basins “C” and “D” while the topography near the western portion of the property slopes to the east toward 
proposed stormwater management basin “E” and “F”. 
 
The underlying upland soils on the property consist mainly of Canton & Charlton fine sandy loam and 
Canton-Chatfield Complex (all of which are NRCS hydrologic soil group 'B'). The wetlands area on the 
property was assumed to be hydrologic soil group ‘D’ for design purposes due to its saturated condition. 
 
The proposed project includes several BMP and LID techniques and measures to mitigate impacts of 
stormwater runoff and reduce the pollutant content of stormwater discharge. The proposed methods 
include, but are not limited to: breaking up areas of impervious surfaces and avoiding concentrated point 
discharges, encouraging overland flow by using open swales and a partial-curbless roadway and parking 
areas, inhibiting erosion by using pre-formed scour holes and bioretention areas at pipe outfalls, deep 
catch basins sumps and outlet hoods, minimizing the removal of existing trees, introducing dense new 
landscaping and wetlands buffer plantings, and maintaining existing drainage patterns. Also refer to the 
project wetland report by Cowen Ecodesign for additional information. 
 
The NRCS TR-55 methodology was utilized to evaluate existing and proposed stormwater runoff 
conditions with the AutoCAD embedded HydraFlow Hydrographs computer program. All times of 
concentration were computed using the TR-55 methodology as recommended by the ConnDOT Drainage 
Manual. The Town of Waterford recommends using the 24-hour NRCS Type III rainfall distribution for all 
storms. All rainfall amounts used in this analysis were taken from the Hydrometeorological Design 
Studies Center of the National Oceanic and Atmospheric Administration (NOAA) National Weather 
Service and published in NOAA Atlas 14 Volume 10: Precipitation-Frequency Atlas of the United States, 
Northeastern States, last revised on September 30, 2015. Refer to the plan entitled “Drainage Area Map” 
enclosed within this report for all watershed information. 
 
 
 
 
 

 
Drainage Report 
Ivy Hill Village 
Page 2 of 2 
 
Included with this report are HydraFlow supporting computations and hydrographs for the existing 
conditions and proposed conditions. Two design points were analyized and include Design Point #1 near 
the northwestern corner of the property and Design Point #2 near the southeastern corner of the property 
– see enclosed Drainage Area Maps for further information. Detailed summaries of the computational 
results for the 10, 25, 50 and 100-year storms are also included. The results indicate that the proposed 
peak rate of runoff and volume of runoff will decrease to both design points for the 10-year through 100-
year storms. See attached summary tables. 
 
The stormwater management basins are proposed to capture, attenuate and enhance the runoff 
generated from the proposed site improvements. The outlet control structures will meter the volume and 
rate of runoff to less than the existing conditions. The stormwater basins provide a minimum of 1-foot of 
freeboard to the top of the berm for the 100-year storms. A permeability range was estimated from NRCS 
published data and reduced per the DEEP Stormwater Quality Manual. Refer to the attached summary 
tables for tabulated results for peak rates of runoff, volume of runoff and water surface elevations for the 
pre- and post-development conditions. 
 
 
 
 
 

DRAINAGE SUMMARY
DATE:
MAR. 30, 2022
SHEET NO.:
1
DS-1
of
2
SCALE:
N/A
DRAWN BY:
JG
CHKD BY:
JW
DWG. NO.:
PLAN PREPARED BY:
INDIGO LAND DESIGN, LLC
JOSEPH WREN, P.E.
CT REG. NO. 21090
40 ELM STREET, 2ND FLOOR
OLD SAYBROOK, CT 06475
PHONE: (860) 388-9343
FAX: (860) 391-8854
WATERFORD, CONNECTICUT
48 GREAT NECK ROAD -- MAP 145 LOT 2871
PREPARED FOR SKIP ADAMS

PROPOSED BASIN SUMMARY
DATE:
SHEET NO.:
2
PBS-1
of
2
SCALE:
N/A
DRAWN BY:
CHKD BY:
JW
DWG. NO.:
PLAN PREPARED BY:
INDIGO LAND DESIGN, LLC
JOSEPH WREN, P.E.
CT REG. NO. 21090
40 ELM STREET, 2ND FLOOR
OLD SAYBROOK, CT 06475
PHONE: (860) 388-9343
FAX: (860) 391-8854
MAR. 30, 2022
JG
WATERFORD, CONNECTICUT
48 GREAT NECK ROAD -- MAP 145 LOT 2871
PREPARED FOR SKIP ADAMS

WATER QUALITY VOLUME CALCULATIONS
DATE:
JULY 12, 2022
SHEET NO.:
3
WQV-1
of
3
SCALE:
N/A
DRAWN BY:
RG
CHKD BY:
JW
DWG. NO.:
PLAN PREPARED BY:
INDIGO LAND DESIGN, LLC
JOSEPH WREN, P.E.
CT REG. NO. 21090
40 ELM STREET, 2ND FLOOR
OLD SAYBROOK, CT 06475
PHONE: (860) 388-9343
FAX: (860) 391-8854
WATERFORD, CONNECTICUT
114 CROSS ROAD -- MAP 97 LOT 1712
PREPARED FOR MEMLE PROPERTIES, LLC

EXISTING DRAINAGE
COMPUTATIONS
3-30-2022
WATERFORD, CONNECTICUT
MAP 145 LOT 2871
PREPARED FOR SKIP ADAMS
48 GREAT NECK ROAD

1 - Western Basin
2 - Eastern Basin
3 - Combined
1
Watershed Model Schematic
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Project: Existing Conditions (3-30-22).gpw
Thursday, 04 / 7 / 2022
Hyd. Origin
Description
Legend
1
SCS Runoff
Western Basin
2
SCS Runoff
Eastern Basin
3
Combine
Combined

Hydrograph Return Period Recap
2
Hyd.
Hydrograph
Inflow
Peak Outflow (cfs)
Hydrograph
No.
type
hyd(s)
Description
(origin)
1-yr
2-yr
3-yr
5-yr
10-yr
25-yr
50-yr
100-yr
1
SCS Runoff
------
-------
-------
-------
-------
76.51
90.96
106.46
124.82
Western Basin
2
SCS Runoff
------
-------
-------
-------
-------
6.558
8.104
9.807
11.86
Eastern Basin
3
Combine
1, 2
-------
-------
-------
-------
82.92
98.85
115.96
136.26
Combined
Proj. file: Existing Conditions (3-30-22).gpw
Thursday, 04 / 7 / 2022
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022

Hydrograph Summary Report
3
Hyd.
Hydrograph
Peak
Time
Time to
Hyd.
Inflow
Maximum
Total
Hydrograph
No.
type
flow
interval
Peak
volume
hyd(s)
elevation
strge used
Description
(origin)
(cfs)
(min)
(min)
(cuft)
(ft)
(cuft)
1
SCS Runoff
76.51
3
768
663,449
------
------
------
Western Basin
2
SCS Runoff
6.558
3
762
50,290
------
------
------
Eastern Basin
3
Combine
82.92
3
768
713,738
1, 2
------
------
Combined
Existing Conditions (3-30-22).gpw
Return Period: 10 Year
Thursday, 04 / 7 / 2022
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 1
Western Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  76.51 cfs
Storm frequency
=  10 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  663,449 cuft
Drainage area
=  48.890 ac
Curve number
=  78
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  72.90 min
Total precip.
=  6.18 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
4
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
10.00
10.00
20.00
20.00
30.00
30.00
40.00
40.00
50.00
50.00
60.00
60.00
70.00
70.00
80.00
80.00
Q (cfs)
Time (min)
Western Basin
Hyd. No. 1 -- 10 Year
Hyd No. 1

TR55 Tc Worksheet
5
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Hyd. No. 1
Western Basin
Description
A
B
C
Totals
Sheet Flow
Manning's n-value
=  0.600
0.400
0.011
Flow length (ft)
=  200.0
0.0
0.0
Two-year 24-hr precip. (in)
=  3.43
3.43
0.00
Land slope (%)
=  1.80
1.40
0.00
Travel Time (min)
= 52.10
+
0.00
+
0.00
=
52.10
Shallow Concentrated Flow
Flow length (ft)
=  1850.00
960.00
65.00
Watercourse slope (%)
=  1.70
1.80
3.07
Surface description
=  Unpaved
Paved
Paved
Average velocity (ft/s)
=2.10
2.73
3.56
Travel Time (min)
= 14.66
+
5.87
+
0.30
=
20.83
Channel Flow
X sectional flow area (sqft)
=  0.00
0.00
0.00
Wetted perimeter (ft)
=  0.00
0.00
0.00
Channel slope (%)
=  0.00
0.00
0.00
Manning's n-value
=  0.015
0.015
0.015
Velocity (ft/s)
=0.00
0.00
0.00
Flow length (ft)
({0})0.0
0.0
0.0
Travel Time (min)
= 0.00
+
0.00
+
0.00
=
0.00
Total Travel Time, Tc ..............................................................................
72.90 min

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 2
Eastern Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  6.558 cfs
Storm frequency
=  10 yrs
Time to peak
=  762 min
Time interval
=  3 min
Hyd. volume
=  50,290 cuft
Drainage area
=  5.020 ac
Curve number
=  68
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  59.30 min
Total precip.
=  6.18 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
6
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
1.00
1.00
2.00
2.00
3.00
3.00
4.00
4.00
5.00
5.00
6.00
6.00
7.00
7.00
Q (cfs)
Time (min)
Eastern Basin
Hyd. No. 2 -- 10 Year
Hyd No. 2

TR55 Tc Worksheet
7
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Hyd. No. 2
Eastern Basin
Description
A
B
C
Totals
Sheet Flow
Manning's n-value
=  0.800
0.011
0.011
Flow length (ft)
=  200.0
0.0
0.0
Two-year 24-hr precip. (in)
=  3.43
0.00
0.00
Land slope (%)
=  2.70
0.00
0.00
Travel Time (min)
= 55.76
+
0.00
+
0.00
=
55.76
Shallow Concentrated Flow
Flow length (ft)
=  557.00
0.00
0.00
Watercourse slope (%)
=  2.70
0.00
0.00
Surface description
=  Unpaved
Paved
Paved
Average velocity (ft/s)
=2.65
0.00
0.00
Travel Time (min)
= 3.50
+
0.00
+
0.00
=
3.50
Channel Flow
X sectional flow area (sqft)
=  0.00
0.00
0.00
Wetted perimeter (ft)
=  0.00
0.00
0.00
Channel slope (%)
=  0.00
0.00
0.00
Manning's n-value
=  0.015
0.015
0.015
Velocity (ft/s)
=0.00
0.00
0.00
Flow length (ft)
({0})0.0
0.0
0.0
Travel Time (min)
= 0.00
+
0.00
+
0.00
=
0.00
Total Travel Time, Tc ..............................................................................
59.30 min

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 3
Combined
Hydrograph type
=  Combine
Peak discharge
=  82.92 cfs
Storm frequency
=  10 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  713,738 cuft
Inflow hyds.
=  1, 2
Contrib. drain. area
=  53.910 ac
8
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
10.00
10.00
20.00
20.00
30.00
30.00
40.00
40.00
50.00
50.00
60.00
60.00
70.00
70.00
80.00
80.00
90.00
90.00
Q (cfs)
Time (min)
Combined
Hyd. No. 3 -- 10 Year
Hyd No. 3
Hyd No. 1
Hyd No. 2

Hydrograph Summary Report
9
Hyd.
Hydrograph
Peak
Time
Time to
Hyd.
Inflow
Maximum
Total
Hydrograph
No.
type
flow
interval
Peak
volume
hyd(s)
elevation
strge used
Description
(origin)
(cfs)
(min)
(min)
(cuft)
(ft)
(cuft)
1
SCS Runoff
90.96
3
768
789,321
------
------
------
Western Basin
2
SCS Runoff
8.104
3
759
61,700
------
------
------
Eastern Basin
3
Combine
98.85
3
768
851,021
1, 2
------
------
Combined
Existing Conditions (3-30-22).gpw
Return Period: 25 Year
Thursday, 04 / 7 / 2022
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 1
Western Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  90.96 cfs
Storm frequency
=  25 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  789,321 cuft
Drainage area
=  48.890 ac
Curve number
=  78
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  72.90 min
Total precip.
=  6.97 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
10
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
10.00
10.00
20.00
20.00
30.00
30.00
40.00
40.00
50.00
50.00
60.00
60.00
70.00
70.00
80.00
80.00
90.00
90.00
100.00
100.00
Q (cfs)
Time (min)
Western Basin
Hyd. No. 1 -- 25 Year
Hyd No. 1

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 2
Eastern Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  8.104 cfs
Storm frequency
=  25 yrs
Time to peak
=  759 min
Time interval
=  3 min
Hyd. volume
=  61,700 cuft
Drainage area
=  5.020 ac
Curve number
=  68
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  59.30 min
Total precip.
=  6.97 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
11
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
2.00
2.00
4.00
4.00
6.00
6.00
8.00
8.00
10.00
10.00
Q (cfs)
Time (min)
Eastern Basin
Hyd. No. 2 -- 25 Year
Hyd No. 2

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 3
Combined
Hydrograph type
=  Combine
Peak discharge
=  98.85 cfs
Storm frequency
=  25 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  851,021 cuft
Inflow hyds.
=  1, 2
Contrib. drain. area
=  53.910 ac
12
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
20.00
20.00
40.00
40.00
60.00
60.00
80.00
80.00
100.00
100.00
Q (cfs)
Time (min)
Combined
Hyd. No. 3 -- 25 Year
Hyd No. 3
Hyd No. 1
Hyd No. 2

Hydrograph Summary Report
13
Hyd.
Hydrograph
Peak
Time
Time to
Hyd.
Inflow
Maximum
Total
Hydrograph
No.
type
flow
interval
Peak
volume
hyd(s)
elevation
strge used
Description
(origin)
(cfs)
(min)
(min)
(cuft)
(ft)
(cuft)
1
SCS Runoff
106.46
3
768
925,628
------
------
------
Western Basin
2
SCS Runoff
9.807
3
759
74,279
------
------
------
Eastern Basin
3
Combine
115.96
3
768
999,907
1, 2
------
------
Combined
Existing Conditions (3-30-22).gpw
Return Period: 50 Year
Thursday, 04 / 7 / 2022
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 1
Western Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  106.46 cfs
Storm frequency
=  50 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  925,628 cuft
Drainage area
=  48.890 ac
Curve number
=  78
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  72.90 min
Total precip.
=  7.81 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
14
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
20.00
20.00
40.00
40.00
60.00
60.00
80.00
80.00
100.00
100.00
120.00
120.00
Q (cfs)
Time (min)
Western Basin
Hyd. No. 1 -- 50 Year
Hyd No. 1

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 2
Eastern Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  9.807 cfs
Storm frequency
=  50 yrs
Time to peak
=  759 min
Time interval
=  3 min
Hyd. volume
=  74,279 cuft
Drainage area
=  5.020 ac
Curve number
=  68
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  59.30 min
Total precip.
=  7.81 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
15
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
2.00
2.00
4.00
4.00
6.00
6.00
8.00
8.00
10.00
10.00
Q (cfs)
Time (min)
Eastern Basin
Hyd. No. 2 -- 50 Year
Hyd No. 2

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 3
Combined
Hydrograph type
=  Combine
Peak discharge
=  115.96 cfs
Storm frequency
=  50 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  999,907 cuft
Inflow hyds.
=  1, 2
Contrib. drain. area
=  53.910 ac
16
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
20.00
20.00
40.00
40.00
60.00
60.00
80.00
80.00
100.00
100.00
120.00
120.00
Q (cfs)
Time (min)
Combined
Hyd. No. 3 -- 50 Year
Hyd No. 3
Hyd No. 1
Hyd No. 2

Hydrograph Summary Report
17
Hyd.
Hydrograph
Peak
Time
Time to
Hyd.
Inflow
Maximum
Total
Hydrograph
No.
type
flow
interval
Peak
volume
hyd(s)
elevation
strge used
Description
(origin)
(cfs)
(min)
(min)
(cuft)
(ft)
(cuft)
1
SCS Runoff
124.82
3
768
1,088,766
------
------
------
Western Basin
2
SCS Runoff
11.86
3
759
89,572
------
------
------
Eastern Basin
3
Combine
136.26
3
768
1,178,338
1, 2
------
------
Combined
Existing Conditions (3-30-22).gpw
Return Period: 100 Year
Thursday, 04 / 7 / 2022
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 1
Western Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  124.82 cfs
Storm frequency
=  100 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  1,088,766 cuft
Drainage area
=  48.890 ac
Curve number
=  78
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  72.90 min
Total precip.
=  8.80 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
18
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
20.00
20.00
40.00
40.00
60.00
60.00
80.00
80.00
100.00
100.00
120.00
120.00
140.00
140.00
Q (cfs)
Time (min)
Western Basin
Hyd. No. 1 -- 100 Year
Hyd No. 1

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 2
Eastern Basin
Hydrograph type
=  SCS Runoff
Peak discharge
=  11.86 cfs
Storm frequency
=  100 yrs
Time to peak
=  759 min
Time interval
=  3 min
Hyd. volume
=  89,572 cuft
Drainage area
=  5.020 ac
Curve number
=  68
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  59.30 min
Total precip.
=  8.80 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
19
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
2.00
2.00
4.00
4.00
6.00
6.00
8.00
8.00
10.00
10.00
12.00
12.00
Q (cfs)
Time (min)
Eastern Basin
Hyd. No. 2 -- 100 Year
Hyd No. 2

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 3
Combined
Hydrograph type
=  Combine
Peak discharge
=  136.26 cfs
Storm frequency
=  100 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  1,178,338 cuft
Inflow hyds.
=  1, 2
Contrib. drain. area
=  53.910 ac
20
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
20.00
20.00
40.00
40.00
60.00
60.00
80.00
80.00
100.00
100.00
120.00
120.00
140.00
140.00
Q (cfs)
Time (min)
Combined
Hyd. No. 3 -- 100 Year
Hyd No. 3
Hyd No. 1
Hyd No. 2

Hydraflow Rainfall Report
21
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Return
Intensity-Duration-Frequency Equation Coefficients (FHA)
Period
(Yrs)
B
D
E
(N/A)
1
0.0000
0.0000
0.0000
--------
2
69.8703
13.1000
0.8658
--------
3
0.0000
0.0000
0.0000
--------
5
79.2597
14.6000
0.8369
--------
10
88.2351
15.5000
0.8279
--------
25
102.6072
16.5000
0.8217
--------
50
114.8193
17.2000
0.8199
--------
100
127.1596
17.8000
0.8186
--------
File name: SampleFHA.idf
Intensity = B / (Tc + D)^E
Return
Intensity Values (in/hr)
Period
(Yrs)
5 min
10
15
20
25
30
35
40
45
50
55
60
1
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2
5.69
4.61
3.89
3.38
2.99
2.69
2.44
2.24
2.07
1.93
1.81
1.70
3
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
5
6.57
5.43
4.65
4.08
3.65
3.30
3.02
2.79
2.59
2.42
2.27
2.15
10
7.24
6.04
5.21
4.59
4.12
3.74
3.43
3.17
2.95
2.77
2.60
2.46
25
8.25
6.95
6.03
5.34
4.80
4.38
4.02
3.73
3.48
3.26
3.07
2.91
50
9.04
7.65
6.66
5.92
5.34
4.87
4.49
4.16
3.88
3.65
3.44
3.25
100
9.83
8.36
7.30
6.50
5.87
5.36
4.94
4.59
4.29
4.03
3.80
3.60
Tc = time in minutes. Values may exceed 60.
Rainfall Precipitation Table (in)
Precip. file name: Sample.pcp
Storm
Distribution
1-yr
2-yr
3-yr
5-yr
10-yr
25-yr
50-yr
100-yr
SCS 24-hour
2.86
3.43
4.36
5.12
6.18
6.97
7.81
8.80
SCS 6-Hr
0.00
1.80
0.00
0.00
2.60
0.00
0.00
4.00
Huff-1st
0.00
1.55
0.00
2.75
4.00
5.38
6.50
8.00
Huff-2nd
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Huff-3rd
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Huff-4th
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Huff-Indy
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Custom
0.00
1.75
0.00
2.80
3.90
5.25
6.00
7.10

Hydraflow Table of Contents
Existing Conditions (3-30-22).gpw
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Watershed Model Schematic...................................................................................... 1
Hydrograph Return Period Recap............................................................................. 2
10 - Year
Summary Report......................................................................................................................... 3
Hydrograph Reports................................................................................................................... 4
Hydrograph No. 1, SCS Runoff, Western Basin....................................................................... 4
TR-55 Tc Worksheet............................................................................................................ 5
Hydrograph No. 2, SCS Runoff, Eastern Basin........................................................................ 6
TR-55 Tc Worksheet............................................................................................................ 7
Hydrograph No. 3, Combine, Combined.................................................................................. 8
25 - Year
Summary Report......................................................................................................................... 9
Hydrograph Reports................................................................................................................. 10
Hydrograph No. 1, SCS Runoff, Western Basin..................................................................... 10
Hydrograph No. 2, SCS Runoff, Eastern Basin...................................................................... 11
Hydrograph No. 3, Combine, Combined................................................................................ 12
50 - Year
Summary Report....................................................................................................................... 13
Hydrograph Reports................................................................................................................. 14
Hydrograph No. 1, SCS Runoff, Western Basin..................................................................... 14
Hydrograph No. 2, SCS Runoff, Eastern Basin...................................................................... 15
Hydrograph No. 3, Combine, Combined................................................................................ 16
100 - Year
Summary Report....................................................................................................................... 17
Hydrograph Reports................................................................................................................. 18
Hydrograph No. 1, SCS Runoff, Western Basin..................................................................... 18
Hydrograph No. 2, SCS Runoff, Eastern Basin...................................................................... 19
Hydrograph No. 3, Combine, Combined................................................................................ 20
IDF Report.................................................................................................................. 21

PROPOSED DRAINAGE
COMPUTATIONS
3-30-2022
WATERFORD, CONNECTICUT
MAP 145 LOT 2871
PREPARED FOR SKIP ADAMS
48 GREAT NECK ROAD

1 - Western Subwatershed
2 - Eastern Subwatershed
3 - Subwatershed C
4 - Subwatershed D
5 - Basin D
6 - Basin C
7 - Subwatershed E
8 - Basin E
9 - Subwatershed F
10 - Basin F
11 - Combined
1
Watershed Model Schematic
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Project: Proposed Conditions (Split Watershed 3-30-22).gpw
Thursday, 04 / 7 / 2022
Hyd. Origin
Description
Legend
1
SCS Runoff
Western Subwatershed
2
SCS Runoff
Eastern Subwatershed
3
SCS Runoff
Subwatershed C
4
SCS Runoff
Subwatershed D
5
Reservoir
Basin D
6
Reservoir
Basin C
7
SCS Runoff
Subwatershed E
8
Reservoir
Basin E
9
SCS Runoff
Subwatershed F
10
Reservoir
Basin F
11
Combine
Combined

Hydrograph Return Period Recap
2
Hyd.
Hydrograph
Inflow
Peak Outflow (cfs)
Hydrograph
No.
type
hyd(s)
Description
(origin)
1-yr
2-yr
3-yr
5-yr
10-yr
25-yr
50-yr
100-yr
1
SCS Runoff
------
-------
-------
-------
-------
79.44
93.49
108.48
126.17
Western Subwatershed
2
SCS Runoff
------
-------
-------
-------
-------
2.259
2.768
3.324
3.994
Eastern Subwatershed
3
SCS Runoff
------
-------
-------
-------
-------
4.152
4.898
5.695
6.635
Subwatershed C
4
SCS Runoff
------
-------
-------
-------
-------
3.754
4.419
5.129
5.967
Subwatershed D
5
Reservoir
4
-------
-------
-------
-------
0.032
0.034
0.036
0.039
Basin D
6
Reservoir
3
-------
-------
-------
-------
0.032
0.037
0.209
1.508
Basin C
7
SCS Runoff
------
-------
-------
-------
-------
1.708
2.006
2.324
2.698
Subwatershed E
8
Reservoir
7
-------
-------
-------
-------
0.757
0.782
0.790
0.822
Basin E
9
SCS Runoff
------
-------
-------
-------
-------
0.839
0.999
1.170
1.373
Subwatershed F
10
Reservoir
9
-------
-------
-------
-------
0.728
0.795
0.832
0.841
Basin F
11
Combine
1, 2, 5,
6, 8, 10
-------
-------
-------
-------
81.98
97.10
112.42
130.95
Combined
Proj. file: Proposed Conditions (Split Watershed 3-30-22).gpw
Thursday, 04 / 7 / 2022
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022

Hydrograph Summary Report
3
Hyd.
Hydrograph
Peak
Time
Time to
Hyd.
Inflow
Maximum
Total
Hydrograph
No.
type
flow
interval
Peak
volume
hyd(s)
elevation
strge used
Description
(origin)
(cfs)
(min)
(min)
(cuft)
(ft)
(cuft)
1
SCS Runoff
79.44
3
768
690,064
------
------
------
Western Subwatershed
2
SCS Runoff
2.259
3
771
19,802
------
------
------
Eastern Subwatershed
3
SCS Runoff
4.152
3
753
28,412
------
------
------
Subwatershed C
4
SCS Runoff
3.754
3
774
35,154
------
------
------
Subwatershed D
5
Reservoir
0.032
3
837
596
4
66.05
13,282
Basin D
6
Reservoir
0.032
3
825
584
3
66.02
13,297
Basin C
7
SCS Runoff
1.708
3
729
6,760
------
------
------
Subwatershed E
8
Reservoir
0.757
3
750
1,775
7
63.05
2,006
Basin E
9
SCS Runoff
0.839
3
729
3,300
------
------
------
Subwatershed F
10
Reservoir
0.728
3
732
858
9
62.59
713
Basin F
11
Combine
81.98
3
768
713,679
1, 2, 5,
6, 8, 10
------
------
Combined
Proposed Conditions (Split Watershed 3-30-22).gpw
Return Period: 10 Year
Thursday, 04 / 7 / 2022
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 1
Western Subwatershed
Hydrograph type
=  SCS Runoff
Peak discharge
=  79.44 cfs
Storm frequency
=  10 yrs
Time to peak
=  768 min
Time interval
=  3 min
Hyd. volume
=  690,064 cuft
Drainage area
=  46.960 ac
Curve number
=  81
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  72.90 min
Total precip.
=  6.18 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
4
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
10.00
10.00
20.00
20.00
30.00
30.00
40.00
40.00
50.00
50.00
60.00
60.00
70.00
70.00
80.00
80.00
Q (cfs)
Time (min)
Western Subwatershed
Hyd. No. 1 -- 10 Year
Hyd No. 1

TR55 Tc Worksheet
5
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Hyd. No. 1
Western Subwatershed
Description
A
B
C
Totals
Sheet Flow
Manning's n-value
=  0.600
0.400
0.011
Flow length (ft)
=  200.0
0.0
0.0
Two-year 24-hr precip. (in)
=  3.43
3.43
0.00
Land slope (%)
=  1.80
1.40
0.00
Travel Time (min)
= 52.10
+
0.00
+
0.00
=
52.10
Shallow Concentrated Flow
Flow length (ft)
=  1850.00
960.00
65.00
Watercourse slope (%)
=  1.70
1.80
3.07
Surface description
=  Unpaved
Paved
Paved
Average velocity (ft/s)
=2.10
2.73
3.56
Travel Time (min)
= 14.66
+
5.87
+
0.30
=
20.83
Channel Flow
X sectional flow area (sqft)
=  0.00
0.00
0.00
Wetted perimeter (ft)
=  0.00
0.00
0.00
Channel slope (%)
=  0.00
0.00
0.00
Manning's n-value
=  0.015
0.015
0.015
Velocity (ft/s)
=0.00
0.00
0.00
Flow length (ft)
({0})0.0
0.0
0.0
Travel Time (min)
= 0.00
+
0.00
+
0.00
=
0.00
Total Travel Time, Tc ..............................................................................
72.90 min

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 2
Eastern Subwatershed
Hydrograph type
=  SCS Runoff
Peak discharge
=  2.259 cfs
Storm frequency
=  10 yrs
Time to peak
=  771 min
Time interval
=  3 min
Hyd. volume
=  19,802 cuft
Drainage area
=  1.850 ac
Curve number
=  70
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  73.00 min
Total precip.
=  6.18 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
6
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
1.00
1.00
2.00
2.00
3.00
3.00
Q (cfs)
Time (min)
Eastern Subwatershed
Hyd. No. 2 -- 10 Year
Hyd No. 2

TR55 Tc Worksheet
7
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Hyd. No. 2
Eastern Subwatershed
Description
A
B
C
Totals
Sheet Flow
Manning's n-value
=  0.800
0.011
0.011
Flow length (ft)
=  300.0
0.0
0.0
Two-year 24-hr precip. (in)
=  3.43
0.00
0.00
Land slope (%)
=  3.10
0.00
0.00
Travel Time (min)
= 72.98
+
0.00
+
0.00
=
72.98
Shallow Concentrated Flow
Flow length (ft)
=  9.00
0.00
0.00
Watercourse slope (%)
=  3.10
0.00
0.00
Surface description
=  Unpaved
Paved
Paved
Average velocity (ft/s)
=2.84
0.00
0.00
Travel Time (min)
= 0.05
+
0.00
+
0.00
=
0.05
Channel Flow
X sectional flow area (sqft)
=  0.00
0.00
0.00
Wetted perimeter (ft)
=  0.00
0.00
0.00
Channel slope (%)
=  0.00
0.00
0.00
Manning's n-value
=  0.015
0.015
0.015
Velocity (ft/s)
=0.00
0.00
0.00
Flow length (ft)
({0})0.0
0.0
0.0
Travel Time (min)
= 0.00
+
0.00
+
0.00
=
0.00
Total Travel Time, Tc ..............................................................................
73.00 min

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 3
Subwatershed C
Hydrograph type
=  SCS Runoff
Peak discharge
=  4.152 cfs
Storm frequency
=  10 yrs
Time to peak
=  753 min
Time interval
=  3 min
Hyd. volume
=  28,412 cuft
Drainage area
=  1.960 ac
Curve number
=  80
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  48.80 min
Total precip.
=  6.18 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
8
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
1.00
1.00
2.00
2.00
3.00
3.00
4.00
4.00
5.00
5.00
Q (cfs)
Time (min)
Subwatershed C
Hyd. No. 3 -- 10 Year
Hyd No. 3

TR55 Tc Worksheet
9
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Hyd. No. 3
Subwatershed C
Description
A
B
C
Totals
Sheet Flow
Manning's n-value
=  0.800
0.240
0.011
Flow length (ft)
=  201.0
99.0
0.0
Two-year 24-hr precip. (in)
=  3.43
3.43
0.00
Land slope (%)
=  7.50
3.70
0.00
Travel Time (min)
= 37.21
+
10.69
+
0.00
=
47.90
Shallow Concentrated Flow
Flow length (ft)
=  169.74
0.00
0.00
Watercourse slope (%)
=  3.70
0.00
0.00
Surface description
=  Unpaved
Paved
Paved
Average velocity (ft/s)
=3.10
0.00
0.00
Travel Time (min)
= 0.91
+
0.00
+
0.00
=
0.91
Channel Flow
X sectional flow area (sqft)
=  0.00
0.00
0.00
Wetted perimeter (ft)
=  0.00
0.00
0.00
Channel slope (%)
=  0.00
0.00
0.00
Manning's n-value
=  0.015
0.015
0.015
Velocity (ft/s)
=0.00
0.00
0.00
Flow length (ft)
({0})0.0
0.0
0.0
Travel Time (min)
= 0.00
+
0.00
+
0.00
=
0.00
Total Travel Time, Tc ..............................................................................
48.80 min

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 4
Subwatershed D
Hydrograph type
=  SCS Runoff
Peak discharge
=  3.754 cfs
Storm frequency
=  10 yrs
Time to peak
=  774 min
Time interval
=  3 min
Hyd. volume
=  35,154 cuft
Drainage area
=  2.410 ac
Curve number
=  81
Basin Slope
=  0.0 %
Hydraulic length
=  0 ft
Tc method
=  TR55
Time of conc. (Tc)
=  81.20 min
Total precip.
=  6.18 in
Distribution
=  Type III
Storm duration
=  24 hrs
Shape factor
=  484
10
0
180
360
540
720
900
1080
1260
1440
1620
Q (cfs)
0.00
0.00
1.00
1.00
2.00
2.00
3.00
3.00
4.00
4.00
Q (cfs)
Time (min)
Subwatershed D
Hyd. No. 4 -- 10 Year
Hyd No. 4

TR55 Tc Worksheet
11
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Hyd. No. 4
Subwatershed D
Description
A
B
C
Totals
Sheet Flow
Manning's n-value
=  0.240
0.011
0.011
Flow length (ft)
=  300.0
0.0
0.0
Two-year 24-hr precip. (in)
=  3.43
3.43
0.00
Land slope (%)
=  0.22
0.00
0.00
Travel Time (min)
= 80.26
+
0.00
+
0.00
=
80.26
Shallow Concentrated Flow
Flow length (ft)
=  180.64
0.00
0.00
Watercourse slope (%)
=  2.60
0.00
0.00
Surface description
=  Paved
Paved
Paved
Average velocity (ft/s)
=3.28
0.00
0.00
Travel Time (min)
= 0.92
+
0.00
+
0.00
=
0.92
Channel Flow
X sectional flow area (sqft)
=  0.00
0.00
0.00
Wetted perimeter (ft)
=  0.00
0.00
0.00
Channel slope (%)
=  0.00
0.00
0.00
Manning's n-value
=  0.015
0.015
0.015
Velocity (ft/s)
=0.00
0.00
0.00
Flow length (ft)
({0})0.0
0.0
0.0
Travel Time (min)
= 0.00
+
0.00
+
0.00
=
0.00
Total Travel Time, Tc ..............................................................................
81.20 min

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 5
Basin D
Hydrograph type
=  Reservoir
Peak discharge
=  0.032 cfs
Storm frequency
=  10 yrs
Time to peak
=  837 min
Time interval
=  3 min
Hyd. volume
=  596 cuft
Inflow hyd. No.
=  4 - Subwatershed D
Max. Elevation
=  66.05 ft
Reservoir name
=  Basin D Pond
Max. Storage
=  13,282 cuft
Storage Indication method used.  Exfiltration extracted from Outflow.
12
0
180
360
540
720
900
1080
1260
Q (cfs)
0.00
0.00
1.00
1.00
2.00
2.00
3.00
3.00
4.00
4.00
Q (cfs)
Time (min)
Basin D
Hyd. No. 5 -- 10 Year
Hyd No. 5
Hyd No. 4
Total storage used = 13,282 cuft

Pond Report
13
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Pond No. 2 -  Basin D Pond
Pond Data
Contours -User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 63.00 ft
Stage / Storage Table
Stage (ft)
Elevation (ft)
Contour area (sqft)
Incr. Storage (cuft)
Total storage (cuft)
0.00
63.00
496
0
0
1.00
64.00
2,237
1,367
1,367
2.00
65.00
4,405
3,321
4,688
3.00
66.00
11,175
7,790
12,478
4.00
67.00
18,515
14,845
27,323
5.00
68.00
20,565
19,540
46,863
5.50
68.50
23,404
10,992
57,855
Culvert / Orifice Structures
Weir Structures
[A]
[B]
[C]
[PrfRsr]
[A]
[B]
[C]
[D]
Rise (in)
=  6.00
1.00
Inactive
Inactive
Span (in)
=  6.00
1.00
3.00
0.00
No. Barrels
=  1
1
1
0
Invert El. (ft)
=  63.50
64.50
64.00
0.00
Length (ft)
=  50.00
1.00
1.00
0.00
Slope (%)
=  1.50
1.00
1.00
n/a
N-Value
=  .013
.013
.013
n/a
Orifice Coeff.
=  0.60
0.60
0.60
0.60
Multi-Stage
=  n/a
Yes
Yes
No
Crest Len (ft)
=  15.00
10.00
Inactive
Inactive
Crest El. (ft)
=  67.00
67.50
0.00
0.00
Weir Coeff.
=  2.60
2.60
3.33
3.33
Weir Type
=  Broad
Broad
---
---
Multi-Stage
=  Yes
No
No
No
Exfil.(in/hr)
=  6.000 (by Contour)
TW Elev. (ft)
=  0.00
Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control.  Weir risers checked for orifice conditions (ic) and submergence (s).
Stage / Storage / Discharge Table
Stage
Storage
Elevation
Clv A
Clv B
Clv C
PrfRsr
Wr A
Wr B
Wr C
Wr D
Exfil
User
Total
ft
cuft
ft
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
0.00
0
63.00
0.00
0.00
0.00
---
0.00
0.00
---
---
0.000
---
0.000
0.10
137
63.10
0.00
0.00
0.00
---
0.00
0.00
---
---
0.031
---
0.031
0.20
273
63.20
0.00
0.00
0.00
---
0.00
0.00
---
---
0.062
---
0.062
0.30
410
63.30
0.00
0.00
0.00
---
0.00
0.00
---
---
0.093
---
0.093
0.40
547
63.40
0.00
0.00
0.00
---
0.00
0.00
---
---
0.124
---
0.124
0.50
683
63.50
0.00
0.00
0.00
---
0.00
0.00
---
---
0.155
---
0.155
0.60
820
63.60
0.00
0.00
0.00
---
0.00
0.00
---
---
0.186
---
0.186
0.70
957
63.70
0.00
0.00
0.00
---
0.00
0.00
---
---
0.217
---
0.217
0.80
1,093
63.80
0.00
0.00
0.00
---
0.00
0.00
---
---
0.249
---
0.249
0.90
1,230
63.90
0.00
0.00
0.00
---
0.00
0.00
---
---
0.280
---
0.280
1.00
1,367
64.00
0.00
0.00
0.00
---
0.00
0.00
---
---
0.311
---
0.311
1.10
1,699
64.10
0.00
0.00
0.00
---
0.00
0.00
---
---
0.341
---
0.341
1.20
2,031
64.20
0.00
0.00
0.00
---
0.00
0.00
---
---
0.371
---
0.371
1.30
2,363
64.30
0.00
0.00
0.00
---
0.00
0.00
---
---
0.401
---
0.401
1.40
2,695
64.40
0.00
0.00
0.00
---
0.00
0.00
---
---
0.431
---
0.431
1.50
3,027
64.50
0.00
0.00
0.00
---
0.00
0.00
---
---
0.461
---
0.461
1.60
3,359
64.60
0.01 ic
0.01 ic
0.00
---
0.00
0.00
---
---
0.491
---
0.498
1.70
3,691
64.70
0.01 ic
0.01 ic
0.00
---
0.00
0.00
---
---
0.521
---
0.532
1.80
4,023
64.80
0.01 ic
0.01 ic
0.00
---
0.00
0.00
---
---
0.552
---
0.565
1.90
4,355
64.90
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.582
---
0.597
2.00
4,688
65.00
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.612
---
0.630
2.10
5,467
65.10
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.706
---
0.725
2.20
6,246
65.20
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.800
---
0.821
2.30
7,025
65.30
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.894
---
0.917
2.40
7,804
65.40
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.988
---
1.012
2.50
8,583
65.50
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.082
---
1.108
2.60
9,362
65.60
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.176
---
1.203
2.70
10,141
65.70
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.270
---
1.298
2.80
10,920
65.80
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.364
---
1.393
2.90
11,699
65.90
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.458
---
1.489
3.00
12,478
66.00
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.552
---
1.584
3.10
13,962
66.10
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.654
---
1.687
3.20
15,447
66.20
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.756
---
1.790
3.30
16,931
66.30
0.04 ic
0.03 ic
0.00
---
0.00
0.00
---
---
1.858
---
1.893
3.40
18,416
66.40
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
1.960
---
1.996
3.50
19,900
66.50
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
2.062
---
2.099
Continues on next page...

14
Basin D Pond
Stage / Storage / Discharge Table
Stage
Storage
Elevation
Clv A
Clv B
Clv C
PrfRsr
Wr A
Wr B
Wr C
Wr D
Exfil
User
Total
ft
cuft
ft
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
3.60
21,385
66.60
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
2.164
---
2.201
3.70
22,869
66.70
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
2.266
---
2.304
3.80
24,354
66.80
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
2.368
---
2.407
3.90
25,838
66.90
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
2.470
---
2.510
4.00
27,323
67.00
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
2.572
---
2.613
4.10
29,277
67.10
1.25 oc
0.02 ic
0.00
---
1.23
0.00
---
---
2.600
---
3.851
4.20
31,231
67.20
1.35 oc
0.00 ic
0.00
---
1.34 s
0.00
---
---
2.628
---
3.973
4.30
33,185
67.30
1.36 oc
0.00 ic
0.00
---
1.35 s
0.00
---
---
2.657
---
4.010
4.40
35,139
67.40
1.38 oc
0.00 ic
0.00
---
1.38 s
0.00
---
---
2.685
---
4.064
4.50
37,093
67.50
1.40 oc
0.00 ic
0.00
---
1.36 s
0.00
---
---
2.714
---
4.076
4.60
39,047
67.60
1.41 oc
0.00 ic
0.00
---
1.40 s
0.82
---
---
2.742
---
4.963
4.70
41,001
67.70
1.43 oc
0.00 ic
0.00
---
1.37 s
2.33
---
---
2.771
---
6.470
4.80
42,955
67.80
1.45 oc
0.00 ic
0.00
---
1.38 s
4.27
---
---
2.799
---
8.447
4.90
44,909
67.90
1.46 oc
0.00 ic
0.00
---
1.23 s
6.58
---
---
2.828
---
10.64
5.00
46,863
68.00
1.48 oc
0.00 ic
0.00
---
1.45 s
9.19
---
---
2.856
---
13.50
5.05
47,962
68.05
1.49 oc
0.00 ic
0.00
---
0.87 s
10.61
---
---
2.896
---
14.37
5.10
49,061
68.10
1.49 oc
0.00 ic
0.00
---
1.00 s
12.08
---
---
2.935
---
16.02
5.15
50,160
68.15
1.50 oc
0.00 ic
0.00
---
0.97 s
13.63
---
---
2.975
---
17.57
5.20
51,259
68.20
1.51 oc
0.00 ic
0.00
---
1.01 s
15.23
---
---
3.014
---
19.25
5.25
52,359
68.25
1.52 oc
0.00 ic
0.00
---
1.16 s
16.89
---
---
3.053
---
21.10
5.30
53,458
68.30
1.52 oc
0.00 ic
0.00
---
1.11 s
18.60
---
---
3.093
---
22.80
5.35
54,557
68.35
1.53 oc
0.00 ic
0.00
---
1.15 s
20.38
---
---
3.132
---
24.66
5.40
55,656
68.40
1.54 oc
0.00 ic
0.00
---
1.07 s
22.20
---
---
3.172
---
26.44
5.45
56,756
68.45
1.55 oc
0.00 ic
0.00
---
1.25 s
24.08
---
---
3.211
---
28.54
5.50
57,855
68.50
1.55 oc
0.00 ic
0.00
---
0.00 s
26.00
---
---
3.251
---
30.80
...End

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 6
Basin C
Hydrograph type
=  Reservoir
Peak discharge
=  0.032 cfs
Storm frequency
=  10 yrs
Time to peak
=  825 min
Time interval
=  3 min
Hyd. volume
=  584 cuft
Inflow hyd. No.
=  3 - Subwatershed C
Max. Elevation
=  66.02 ft
Reservoir name
=  Basin C Pond
Max. Storage
=  13,297 cuft
Storage Indication method used.  Exfiltration extracted from Outflow.
15
0
180
360
540
720
900
1080
1260
Q (cfs)
0.00
0.00
1.00
1.00
2.00
2.00
3.00
3.00
4.00
4.00
5.00
5.00
Q (cfs)
Time (min)
Basin C
Hyd. No. 6 -- 10 Year
Hyd No. 6
Hyd No. 3
Total storage used = 13,297 cuft

Pond Report
16
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Pond No. 1 -  Basin C Pond
Pond Data
Contours -User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 62.00 ft
Stage / Storage Table
Stage (ft)
Elevation (ft)
Contour area (sqft)
Incr. Storage (cuft)
Total storage (cuft)
0.00
62.00
552
0
0
1.00
63.00
2,187
1,370
1,370
2.00
64.00
3,569
2,878
4,248
3.00
65.00
4,461
4,015
8,263
4.00
66.00
5,411
4,936
13,199
5.00
67.00
6,421
5,916
19,115
6.00
68.00
7,923
7,172
26,287
6.50
68.50
9,350
4,318
30,605
Culvert / Orifice Structures
Weir Structures
[A]
[B]
[C]
[PrfRsr]
[A]
[B]
[C]
[D]
Rise (in)
=  6.00
1.00
Inactive
Inactive
Span (in)
=  6.00
1.00
6.00
0.00
No. Barrels
=  1
1
1
0
Invert El. (ft)
=  62.50
64.50
65.00
0.00
Length (ft)
=  50.00
1.00
1.00
0.00
Slope (%)
=  1.50
1.00
1.00
n/a
N-Value
=  .013
.013
.013
n/a
Orifice Coeff.
=  0.60
0.60
0.60
0.60
Multi-Stage
=  n/a
Yes
Yes
No
Crest Len (ft)
=  12.00
10.00
Inactive
Inactive
Crest El. (ft)
=  67.00
67.50
0.00
0.00
Weir Coeff.
=  2.60
2.60
3.33
3.33
Weir Type
=  Broad
Broad
---
---
Multi-Stage
=  Yes
No
No
No
Exfil.(in/hr)
=  6.000 (by Contour)
TW Elev. (ft)
=  0.00
Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control.  Weir risers checked for orifice conditions (ic) and submergence (s).
Stage / Storage / Discharge Table
Stage
Storage
Elevation
Clv A
Clv B
Clv C
PrfRsr
Wr A
Wr B
Wr C
Wr D
Exfil
User
Total
ft
cuft
ft
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
0.00
0
62.00
0.00
0.00
0.00
---
0.00
0.00
---
---
0.000
---
0.000
0.10
137
62.10
0.00
0.00
0.00
---
0.00
0.00
---
---
0.030
---
0.030
0.20
274
62.20
0.00
0.00
0.00
---
0.00
0.00
---
---
0.061
---
0.061
0.30
411
62.30
0.00
0.00
0.00
---
0.00
0.00
---
---
0.091
---
0.091
0.40
548
62.40
0.00
0.00
0.00
---
0.00
0.00
---
---
0.121
---
0.121
0.50
685
62.50
0.00
0.00
0.00
---
0.00
0.00
---
---
0.152
---
0.152
0.60
822
62.60
0.00
0.00
0.00
---
0.00
0.00
---
---
0.182
---
0.182
0.70
959
62.70
0.00
0.00
0.00
---
0.00
0.00
---
---
0.213
---
0.213
0.80
1,096
62.80
0.00
0.00
0.00
---
0.00
0.00
---
---
0.243
---
0.243
0.90
1,233
62.90
0.00
0.00
0.00
---
0.00
0.00
---
---
0.273
---
0.273
1.00
1,370
63.00
0.00
0.00
0.00
---
0.00
0.00
---
---
0.304
---
0.304
1.10
1,657
63.10
0.00
0.00
0.00
---
0.00
0.00
---
---
0.323
---
0.323
1.20
1,945
63.20
0.00
0.00
0.00
---
0.00
0.00
---
---
0.342
---
0.342
1.30
2,233
63.30
0.00
0.00
0.00
---
0.00
0.00
---
---
0.361
---
0.361
1.40
2,521
63.40
0.00
0.00
0.00
---
0.00
0.00
---
---
0.381
---
0.381
1.50
2,809
63.50
0.00
0.00
0.00
---
0.00
0.00
---
---
0.400
---
0.400
1.60
3,096
63.60
0.00
0.00
0.00
---
0.00
0.00
---
---
0.419
---
0.419
1.70
3,384
63.70
0.00
0.00
0.00
---
0.00
0.00
---
---
0.438
---
0.438
1.80
3,672
63.80
0.00
0.00
0.00
---
0.00
0.00
---
---
0.457
---
0.457
1.90
3,960
63.90
0.00
0.00
0.00
---
0.00
0.00
---
---
0.476
---
0.476
2.00
4,248
64.00
0.00
0.00
0.00
---
0.00
0.00
---
---
0.496
---
0.496
2.10
4,649
64.10
0.00
0.00
0.00
---
0.00
0.00
---
---
0.508
---
0.508
2.20
5,051
64.20
0.00
0.00
0.00
---
0.00
0.00
---
---
0.520
---
0.520
2.30
5,452
64.30
0.00
0.00
0.00
---
0.00
0.00
---
---
0.533
---
0.533
2.40
5,854
64.40
0.00
0.00
0.00
---
0.00
0.00
---
---
0.545
---
0.545
2.50
6,255
64.50
0.00
0.00
0.00
---
0.00
0.00
---
---
0.558
---
0.558
2.60
6,657
64.60
0.01 ic
0.01 ic
0.00
---
0.00
0.00
---
---
0.570
---
0.576
2.70
7,058
64.70
0.01 ic
0.01 ic
0.00
---
0.00
0.00
---
---
0.582
---
0.593
2.80
7,460
64.80
0.01 ic
0.01 ic
0.00
---
0.00
0.00
---
---
0.595
---
0.608
2.90
7,861
64.90
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.607
---
0.623
3.00
8,263
65.00
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.620
---
0.637
3.10
8,756
65.10
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.633
---
0.652
3.20
9,250
65.20
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.646
---
0.667
3.30
9,743
65.30
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.659
---
0.682
3.40
10,237
65.40
0.02 ic
0.02 ic
0.00
---
0.00
0.00
---
---
0.672
---
0.697
Continues on next page...

17
Basin C Pond
Stage / Storage / Discharge Table
Stage
Storage
Elevation
Clv A
Clv B
Clv C
PrfRsr
Wr A
Wr B
Wr C
Wr D
Exfil
User
Total
ft
cuft
ft
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
3.50
10,731
65.50
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.686
---
0.711
3.60
11,224
65.60
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.699
---
0.726
3.70
11,718
65.70
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.712
---
0.740
3.80
12,211
65.80
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.725
---
0.755
3.90
12,705
65.90
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.738
---
0.769
4.00
13,199
66.00
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.752
---
0.783
4.10
13,790
66.10
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.766
---
0.798
4.20
14,382
66.20
0.03 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.780
---
0.813
4.30
14,973
66.30
0.04 ic
0.03 ic
0.00
---
0.00
0.00
---
---
0.794
---
0.828
4.40
15,565
66.40
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
0.808
---
0.843
4.50
16,157
66.50
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
0.822
---
0.858
4.60
16,748
66.60
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
0.836
---
0.873
4.70
17,340
66.70
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
0.850
---
0.888
4.80
17,931
66.80
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
0.864
---
0.903
4.90
18,523
66.90
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
0.878
---
0.918
5.00
19,115
67.00
0.04 ic
0.04 ic
0.00
---
0.00
0.00
---
---
0.892
---
0.933
5.10
19,832
67.10
1.03 oc
0.04 ic
0.00
---
0.99
0.00
---
---
0.913
---
1.941
5.20
20,549
67.20
1.51 oc
0.00 ic
0.00
---
1.50 s
0.00
---
---
0.934
---
2.437
5.30
21,266
67.30
1.52 oc
0.00 ic
0.00
---
1.52 s
0.00
---
---
0.954
---
2.474
5.40
21,983
67.40
1.54 oc
0.00 ic
0.00
---
1.54 s
0.00
---
---
0.975
---
2.512
5.50
22,701
67.50
1.55 oc
0.00 ic
0.00
---
1.54 s
0.00
---
---
0.996
---
2.540
5.60
23,418
67.60
1.57 oc
0.00 ic
0.00
---
1.56 s
0.82
---
---
1.017
---
3.396
5.70
24,135
67.70
1.58 oc
0.00 ic
0.00
---
1.51 s
2.33
---
---
1.038
---
4.871
5.80
24,852
67.80
1.60 oc
0.00 ic
0.00
---
1.54 s
4.27
---
---
1.059
---
6.872
5.90
25,569
67.90
1.61 oc
0.00 ic
0.00
---
1.45 s
6.58
---
---
1.080
---
9.111
6.00
26,287
68.00
1.63 oc
0.00 ic
0.00
---
1.45 s
9.19
---
---
1.100
---
11.74
6.05
26,718
68.05
1.63 oc
0.00 ic
0.00
---
1.53 s
10.61
---
---
1.120
---
13.26
6.10
27,150
68.10
1.64 oc
0.00 ic
0.00
---
1.63 s
12.08
---
---
1.140
---
14.86
6.15
27,582
68.15
1.65 oc
0.00 ic
0.00
---
1.36 s
13.63
---
---
1.160
---
16.15
6.20
28,014
68.20
1.65 oc
0.00 ic
0.00
---
1.43 s
15.23
---
---
1.180
---
17.83
6.25
28,446
68.25
1.66 oc
0.00 ic
0.00
---
1.53 s
16.89
---
---
1.200
---
19.61
6.30
28,877
68.30
1.67 oc
0.00 ic
0.00
---
1.56 s
18.60
---
---
1.219
---
21.38
6.35
29,309
68.35
1.68 oc
0.00 ic
0.00
---
1.63 s
20.38
---
---
1.239
---
23.24
6.40
29,741
68.40
1.68 oc
0.00 ic
0.00
---
1.65 s
22.20
---
---
1.259
---
25.11
6.45
30,173
68.45
1.69 oc
0.00 ic
0.00
---
1.00 s
24.08
---
---
1.279
---
26.35
6.50
30,605
68.50
1.70 oc
0.00 ic
0.00
---
1.65 s
26.00
---
---
1.299
---
28.95
...End

Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk® Civil 3D® by Autodesk, Inc. v2022
Thursday, 04 / 7 / 2022
Hyd. No. 7
Subwatershed E
Hydrograph type
=  SCS Runoff
Peak discharge
=  1.708 cfs
Storm frequency
=  10 yrs
Time to peak
=  729 min
Time interval
=  3 min
Hyd. volume
=  6,760 cuft
Drainage area
=  0.460 ac
Curve number
=  81
Basin Slope
=  0.