Conservation Commission - 128 (11/18/2021)

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Board/CommissionConservation Commission
Meeting DateNovember 18, 2021
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STORMWATER MANAGEMENT REPORT 
WATERFORD WOODS APARTMENTS 
384 & 394 WILLETTS AVE. EXT. 
WATERFORD, CT 
PREPARED FOR 
WATERFORD WOODS, LLC 
606 POST ROAD EAST #320 
WESTPORT, CT 06880 
DATE: 
NOVEMBER 18, 2020 
REVISED: 
SEPTEMBER 21, 2021 


 
 
 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
 
 
 
 
 
 
TOC 
TABLE OF CONTENTS 
 
PROJECT DESCRIPTION ........................................................................................................................ 1 
EXISTING SITE DESCRIPTION ............................................................................................................. 1 
PEAK FLOW CONTROL & FLOOD PROTECTION ............................................................................. 2 
 
PRE-DEVELOPED CONDITIONS ................................................................................................. 2 
 
POST-DEVELOPED CONDITIONS .............................................................................................. 3 
 
COMPARISON ................................................................................................................................ 3 
 
INFILTRATION & DETENTION ................................................................................................... 4 
STORMWATER QUALITY AND TREATMENT ................................................................................... 5 
 
WATER QUALITY VOLUME & FLOW ....................................................................................... 6 
 
GROUNDWATER RECHARGE VOLUME ................................................................................... 6 
CONCLUSION .......................................................................................................................................... 6 
PIPE FLOW ................................................................................................................................................ 6 
APPENDICES 
A. DRAINAGE MAPS 
B. HYDROLOGIC COMPUTATIONS (Hydrograph Summary Report) 
C. STORMWATER TREATMENT COMPUTATIONS 
D. SUPPLEMENTAL DATA 
TABLES 
1. PEAK FLOW COMPARISON – EXISTING VS. PROPOSED (NO DETENTION) ................. 3 
2. PEAK FLOW COMPARISON – EXISTING VS. PROPOSED (WITH DETENTION) ............. 5 
3. PROPOSED TREATMENT SUMMARY .................................................................................... 6 


 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
1 
PROJECT DESCRIPTION 
 
Waterford Woods, LLC is proposing to construct a residential multi-family development on two 
undeveloped parcels of land on the south side of Willetts Avenue Extension totaling 26.64 acres. 
• 0.48-acre parcel located at 384 Willetts Avenue Extension identified as Map 140, Lot 9190 
on the Town of Waterford Tax Assessor Mapping 
• 26.16-acre parcel located at 394 Willetts Avenue Extension identified as Map 140, Lot 9192 
on the Town of Waterford Tax Assessor Mapping 
The combined parcels are hereinafter referred to as the Site. 
The Site is in the Commercial Multi-Family District (C-MF).  The multi-family development received 
site plan approval PL-21-1 on March 9, 2021, per Section 16 & 18 of the Zoning Regulations. An 
application has been submitted to the Town for a site plan modification related to a new Clubhouse 
and associated amenities.  
The multi-family development will consist of the construction of three (3) apartment buildings with a 
total of 98 units with a mix of 58 one-bedroom and 40 two-bedroom dwelling units.  Main access to 
the development will be provided from the north via Willetts Avenue Extension. Additional site work 
will include: 
• Clearing and grubbing. 
• Demolition and removal of the existing outbuilding on 384 Willetts Avenue Extension. 
• Excavation and disposal of construction and demolition debris stockpiled throughout the Site. 
• Construction of three (3) multi-family apartment buildings. 
• Construction of Clubhouse building with exterior pool and patio. 
• Construction of a new curb cut to the north on Willetts Avenue Extension. 
• 28’ main access drive with 24’ wide internal access drives including a looped connection to 
improve vehicular circulation and emergency access throughout the development. 
• Paved parking situated near the apartment buildings and site amenities with a total of 167 
spaces including 6 handicapped accessible. 
• Concrete pedestrian sidewalks connecting the apartment buildings with interior amenities and 
the existing public sidewalk along the south shoulder of Willetts Avenue Extension. 
• Outdoor recreation areas including a mix of active recreation, passive recreation, and 
community spaces. 
• Drainage improvements including a stormwater collection network, grass-lined treatment 
swales, subsurface infiltration systems, and detention ponds. 
• Connection to water, sewer, electric, gas and telecom services in Willetts Avenue Extension. 
• Landscaping including a mixture of street trees, shrubs, foundation plantings and planting beds. 
• Building and street lighting. 
• Erosion and sedimentation control measures. 
EXISTING SITE DESCRIPTION  
Construction related to Site Plan Application PL-21-1 has commenced. Prior to commencement, the 
subject Site was undeveloped except for a small outbuilding along Willetts Avenue Extension.  The 

 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
2 
Site was generally wooded with an internal network of gravel roads leading to stockpiles of 
construction and demolition debris, such as brick, concrete, timber, etc. There are also signs of 
historical rock quarrying at the southwest corner of the site where the current Clubhouse is proposed. 
TOPOGRAPHY – The existing topography generally consists of gentle to moderately sloping terrain 
from the northeast along Willetts Avenue to the southwest towards two (2) wetland areas on Site and 
Fenger Brook.  Existing slopes in the upland areas of the Site range from 4% to 7% with steeper slopes 
around the perimeter of the delineated inland wetland areas. 
SOILS – The USDA NRCS Web Soil Survey indicates that the upland area of the Site contain 
Charlton-Chatfield complex, 0 to 15 percent slopes, very rocky (73C) soils, which have a hydrologic 
soil group classification (HSG) of B.  Inland wetland areas are designed as Ridgebury, Leicester, and 
Whitman soils, 0 to 8 percent slopes, very rocky, which have an HSG of D.  Deep observation test 
holes were performed at the site, which generally confirmed the NRCS soil types within upland areas. 
DRAINAGE – The Site drains from the northeast along Willetts Avenue towards wetland systems to 
the southwest and south.  Three (3) existing drainage areas were delineated based upon topography 
and field observation. 
• SITE-EX-01 is 8.182 acres and consists of the northern portion of the site, which drains to a 
wetland area along the westerly property line. 
• SITE-EX-02 is 2.495 acres and consists of the southeastern corner of the site draining to a 
wetland area along the east and southern property line. 
• SITE-EX-03 is 6.764 acres and consists of a peninsula of upland at the southeast corner of the 
site, which drains from a high point at the center to the perimeter wetlands. 
Based upon CT DEEP mapping, the entire Site lies within the Southeast Shoreline subregional 
drainage basin 2000, which is part of the Southeast Coast major basin 2.  However, based upon the 
“Jordan Brook Watershed Management Plan Final Report, Town of Waterford, Connecticut”, dated 
February 2000, prepared by Fuss & O’Neill, Inc., the Site is included within the Jordan Brook 
subregional basin 2201 (hereinafter JBWMP).  A detailed review of the hydrologic conditions of the 
subregional watershed was not performed as part of this review, however the recommendations of the 
JBWMP were followed as a conservative measure. 
PEAK FLOW CONTROL & FLOOD PROTECTION 
 
Stormwater runoff from the proposed multi-family development will be collected through a series of 
rain gardens, swales, yard drains, catch basins, and drainage piping and discharged to a series of 
treatment, infiltration, and detention areas on the Site.   
Peak flow rates for pre-development and post-development conditions were calculated using SCS TR-
55 methodology.  Hydrology Studio 2020 v.3.0.0.20 was used to generate peak flows from the 
watershed with the following parameters: 
PRE-DEVELOPED CONDITIONS (Drainage Area Map DA-01A) 
• DRAINAGE AREAS:  As described above, the Site has three (3) existing drainage areas. 
o SITE-EX-01 is 8.182 acres and consists of the northern portion of the site, which drains to a 
wetland area along the westerly property line. 

 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
3 
o SITE-EX-02 is 2.495 acres and consists of the southeastern corner of the site draining to a 
wetland area along the east and southern property line. 
o SITE-EX-03 is 6.764 acres and consists of a peninsula of upland at the southeast corner of the 
site, which drains from a high point at the center to the perimeter wetlands. 
• RAINFALL: Precipitation frequency and depth estimates (rainfall data) were obtained from 
NOAA Atlas 14, Volume 10, Version 2 at Lat. 41.3376 Long. -72.1197, which corresponds with 
the geographic location of the Site. 
• RUNOFF COEFFICIENT: Composite Curve Numbers (CN) were calculated based on the land 
cover types for the site for HSG B.  Land cover types consist of impervious buildings and 
pavement, meadow/brush, open space vegetated areas, woods, and wetlands.  Wetland areas were 
excluded from the drainage areas and calculations.   
• TIME OF CONCENTRATION:   Time of concentration (Tc) was estimated for the basin based 
on the SCS method, with sheet and shallow concentrated flow from the hydraulically most distant 
point of the watershed to the discharge point.   
POST-DEVELOPED CONDITIONS (Drainage Area Map DA-02A) 
• DRAINAGE AREA:  For direct comparison with existing conditions, the same three design points 
were evaluated. 
o SITE-PR-01 is 6.648 acres and consists of the north/northwest portion of the developed site. 
o SITE-PR-02 is 3.955 acres and consists of the eastern portion of the developed site. 
o SITE-PR-03 is 6.838 acres consists of a southwestern portion of the developed site. 
• RAINFALL: Same as Pre-Developed Conditions. 
• CURVE NUMBER: Same methodology as Pre-Developed Conditions. Composite Curve 
Numbers (CN) were calculated based on the land cover types for the proposed multi-family 
residential development for HSG B. 
• TIME OF CONCENTRATION:   Same methodology as Pre-Developed Conditions. 
COMPARISON 
A summary of flows for existing and proposed conditions, without consideration of infiltration or 
detention is provided below with a complete output provided in the enclosed Hydrology Studio Report. 
STORM 
EVENT 
AREA 01 
AREA 02 
AREA 03 
TOTAL SITE 
SITE-
EX-01 
SITE-
PR-01 
EX 
SITE-
EX-02 
SITE-
PR-02 
EX 
SITE-
EX-03 
SITE-
PR-03 
EX 
SITE-
EX 
SITE-
PR 
EX 
vs. 
vs. 
vs. 
vs. 
PR 
PR 
PR 
PR 
2-yr 
1.15 
3.84 
2.69 
0.30 
3.20 
2.90 
0.81 
2.75 
1.94 
2.26 
9.61 
7.35 
5-yr 
3.09 
6.66 
3.57 
0.86 
5.20 
4.34 
2.34 
5.67 
3.34 
6.29 
17.08 
10.79 
10-yr 
5.20 
9.24 
4.04 
1.49 
6.99 
5.50 
4.03 
8.48 
4.45 
10.71 
23.98 
13.27 
25-yr 
8.63 
13.08 
4.45 
2.52 
9.60 
7.08 
6.83 
12.83 
6.00 
17.98 
34.35 
16.37 
50-yr 
11.45 
16.05 
4.60 
3.37 
11.59 
8.22 
9.14 
16.25 
7.11 
23.95 
42.39 
18.44 
100-yr 
14.69 
19.32 
4.63 
4.36 
13.77 
9.41 
11.82 
20.09 
8.27 
30.85 
51.31 
20.46 
TABLE 1: PEAK FLOW COMPARISON - EXISTING VS. PROPOSED (NO DETENTION) 

 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
4 
As shown in the table above, the proposed multi-family development (SITE-PR) results in an increase 
in peak flow rates as compared to existing conditions (SITE-EX) without consideration of infiltration 
or detention.  To attenuate peak flow rates, subsurface infiltration and detention ponds are proposed, 
which will collect runoff from the collection network and attenuate peak flow rates and volumes.  
Further discussion is provided below. 
INFILTRATION & DETENTION (Drainage Area Map DA-03A) 
The proposed stormwater network consists of a series of infiltration and detention methods to attenuate 
peak flow rates. 
PROPOSED AREA 01A (SITE-PR-01A) 
Stormwater runoff within PR-01A will discharge to the following structures: 
• INF-01B – Stormtech SC-740 subsurface infiltration systems consisting of 40 units to promote 
treatment and infiltration. 
• POND-01A – Wet extended detention pond used for peak runoff attenuation with a shallow 8” 
deep wet pool and filter bed to promote treatment and infiltration. 
o POND-01A will discharge through outlet control structure 01A (OCS 01A) with staged 
outlets to regulate outflow, emergency overflow weir, and riprap plunge pool to 
dissipate energy and velocity before flowing towards the downstream wetlands. 
PROPOSED AREA 02A (SITE-PR-02A) 
Stormwater runoff within PR-02A will discharge to the following structures: 
• POND-02A – Wet extended detention pond used for peak runoff attenuation with a shallow 
12” deep wet pool and filter bed to promote treatment and infiltration from contributing area. 
o POND-02A will discharge through outlet control structure 02A (OCS 02A) with staged 
outlets to regulate outflow, emergency overflow weir, and riprap plunge pool to 
dissipate energy and velocity before flowing towards the downstream wetlands. 
PROPOSED AREA 03A (SITE-PR-03A) 
Stormwater runoff within PR-03A will discharge to the following structures: 
• POND-03A – Wet extended detention pond used for peak runoff attenuation with a shallow 9” 
deep wet pool and filter bed to promote treatment and infiltration from contributing area. 
o POND-03A will discharge through outlet control structure 03A (OCS 03A) with staged 
outlets to regulate outflow, emergency overflow weir, and riprap plunge pool to 
dissipate energy and velocity before flowing towards the downstream wetlands. 
• POND-03B – Wet extended detention pond used for peak runoff attenuation with a shallow 9” 
deep wet pool and filter bed to promote treatment and infiltration from contributing area. 
o POND-03B will discharge through outlet control structure 03B (OCS 03B) with staged 
outlets to regulate outflow, emergency overflow weir, and riprap plunge pool to 
dissipate energy and velocity before flowing towards the downstream wetlands. 
The combination of subsurface infiltration systems and wet extended detention ponds have been sized 
to attenuate peak flow rates and volumes as compared to pre-development conditions for the 2-, 5-, 
10-, 25-, 50-, and 100-year storm events. 

 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
5 
STORM 
EVENT 
AREA 01 
AREA 02 
AREA 03 
TOTAL SITE 
SITE-
EX-01 
SITE-
PR-
01A 
EX 
SITE-
EX-02 
SITE-
PR-
02A 
EX 
SITE-
EX-03 
SITE-
PR-
03A 
EX 
SITE-
EX 
SITE-
PR-
DET-
A 
EX 
vs. 
vs. 
vs. 
vs. 
PR 
PR 
PR 
PR 
2-yr 
1.15 
1.00 
-0.15 
0.30 
0.37 
0.07 
0.81 
0.28 
-0.53 
2.26 
1.32 
-0.94 
5-yr 
3.09 
2.33 
-0.76 
0.86 
0.73 
-0.13 
2.34 
0.83 
-1.51 
6.29 
3.28 
-3.01 
10-yr 
5.20 
3.69 
-1.51 
1.49 
1.73 
0.24 
4.03 
2.73 
-1.30 
10.71 
6.74 
-3.97 
25-yr 
8.63 
5.38 
-3.25 
2.52 
3.42 
0.90 
6.83 
5.39 
-1.44 
17.98 
13.56 
-4.42 
50-yr 
11.45 
6.88 
-4.57 
3.37 
4.40 
1.03 
9.14 
7.81 
-1.33 
23.95 
18.56 
-5.39 
100-yr 
14.69 
8.78 
-5.91 
4.36 
5.35 
0.99 
11.82 
10.59 
-1.23 
30.85 
24.28 
-6.57 
TABLE 2: PEAK FLOW COMPARISON - EXISTING VS. PROPOSED (WITH DETENTION) 
As shown in Table 2 above, incorporation of the infiltration and detention systems into the proposed 
development results in a decrease in peak flow rates as compared to existing conditions for the entire 
Site.  Although the results show minor increases within with the individual subareas, these increases 
are eliminated for entire Site due to offsetting times to peak flow. The plan provides for zero net 
increase in peak flow rates and volumes for all storms up to the 100-year event. 
STORMWATER QUALITY & TREATMENT  
 
The proposed development has been designed to reduce stormwater runoff and pollutant loads to the 
maximum extent possible and to treat the required water quality volume and flow per the CT DEEP 
2004 Stormwater Quality Manual (2004 DEEP Manual).  The proposed measures incorporated into 
the plan include: 
• Maximize conservation and preservation of natural features. Impervious surfaces and buildings 
generally fall within historic limits of site disturbance activities.  Stone walls, rock outcrops, 
and specimen trees have been preserved. 
• Minimize clearing and grubbing maintain native vegetation on site.  Where clearing of the 
mature tree vegetation is proposed within 50’ of the delineated inland wetlands, native shrubs 
and/or conservation seed mixes are proposed to provide a minimum 50’ upland protection zone 
as recommended in the JBWMP. 
• Minimize building footprint.  Buildings have been designed to accommodate site grades and 
unit areas were condensed to maximizing the number of units in a limit footprint area. 
• Minimize impervious surfaces for roadways and parking.  Curb cuts and access drives are the 
minimum required for adequate site access and the proposed parking quantity is the minimum 
allowed per zoning requirements.  Impervious area totals 15% of the total site, which is lower 
than the 18% to 30% impervious cover referenced in Section 3.1.2.3 of the JBWMP for 
“intermediate” level uses such as multi-family. 
• Disconnect impervious areas where possible, such as sidewalks. Disconnected impervious 
areas were not subtracted from the treatment calculations as a conservative measure. 
• Collect, treat, and infiltrate to encourage groundwater recharge including the incorporation of 
base level and secondary controls to improve water quality as recommended by the JBWMP. 

 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
6 
WATER QUALITY VOLUME & FLOW (Drainage Area Map DA-03A) 
Water quality volumes and flows were calculated for all proposed impervious surfaces for the 
driveway, parking and building areas in accordance with the 2004 DEEP Manual. 
AREA 
DA 
IA 
WQV 
WQF 
WQF 
PROPOSED TREATMENT 
Label 
acre 
acre 
acre-ft 
cfs 
sf 
Method 
Vol 
Flow 
Area 
Note 
01A 
4.285 
1.138 
0.103 
0.735 
N/A 
Sediment Forebay 
0.16 
N/A 
N/A 
158% WQV 
01A 
4.285 
1.138 
0.103 
0.735 
769 
Filter Bed 
N/A 
N/A 
1500 
195% WQF 
01B 
0.917 
0.572 
0.047 
0.526 
N/A 
SC-740 Isolator Row 
N/A 
1.2 
N/A 
228% WQV 
02A 
2.930 
1.486 
0.124 
0.974 
N/A 
Sediment Forebay 
0.055 
N/A 
N/A 
45% WQV 
02A 
2.930 
1.486 
0.124 
0.974 
770 
Filter Bed 
N/A 
N/A 
2100 
272% WQF 
03A 
2.715 
0.287 
0.033 
0.209 
N/A 
Sediment Forebay 
0.041 
N/A 
N/A 
124% WQV 
03A 
2.715 
0.287 
0.033 
0.209 
234 
Filter Bed 
N/A 
N/A 
1000 
427% WQF 
03B 
4.123 
0.467 
0.052 
0.343 
N/A 
Sediment Forebay 
0.01 
N/A 
N/A 
20% WQV [1] 
03B 
4.123 
0.467 
0.052 
0.343 
371 
Filter Bed 
N/A 
N/A 
1400 
377% WQF 
TABLE 3: PROPOSED TREATMENT SUMMARY 
1. No Sediment Load from Clubhouse Roof or Patio. Runoff flows through vegetated filter swale. 
As shown in Table 3 above, the proposed treatment measures will adequately retain the calculated 
water quality volume and/or treat the calculated water quality flow, removing 80% or more of total 
suspended solids and floatable debris for the first inch of rainfall before discharging to the Site 
wetlands 
GROUNDWATER RECHARGE VOLUME  
Existing non-wetland soils are classified as Charlton-Chatfield complex (HSG B) and the wetland 
soils as Ridgebury, Leicester, and Whitman (HSG D).  Required Groundwater Recharge Volumes 
(GRV) were calculated in accordance with 2004 DEEP Manual based upon the area of each 
Hydrologic Soil Group. 
GRV (required) 
= 0.053 acre-feet 
GRV (provided) = 0.232 acre-feet 
The combination of sediment and filtration basins, subsurface infiltration systems, and shallow 
depressions within each wet extended detention pond provide adequate capacity to fully retain over 4 
times the recommended groundwater recharge volume, thereby exceeding the GRV requirement. 
CONCLUSION 
There will be no increase in peak flow rates or volumes discharging to the downgradient wetlands or 
adjacent properties. The stormwater network will maintain approved drainage patterns and utilize a 
combination of subsurface infiltration and detention ponds to regulate any increase in run-off on site.  
No adverse impacts to the site, adjacent wetlands, or municipal system are anticipated. 
PIPE FLOW 
 
Pipe flow was calculated using the Rational Method based on local drainage areas, runoff coefficients 
(C), time of concentration (Tc) and rainfall intensity (I). Stormwater Studio version 3.0.0.24 was used 
to perform proposed pipe flow calculations for the 10 and 25-year design storms based on the 
following parameters.  

 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVE. EXT. 
 
WATERFORD, CONNECTICUT 
7 
• RUNOFF COEFFICIENT: Composite runoff coefficient (C) values were calculated for local 
drainage areas based on existing and proposed surface materials. 
• RAINFALL INTENSITY: Precipitation frequency and depth estimates (rainfall data) were 
obtained from Northeast Regional Climate Center (NRCC) at Lat. 41.713 Long. -72.726, which 
corresponds with the geographic location of the Site.  
• TIME OF CONCENTRATION:  Time of concentration (Tc) was estimated for each collection 
structure based on the SCS method.  For smaller areas with short flow paths over impervious 
surfaces a minimum time of concentration (Tc) of 5 minutes was used. 
PROPOSED NETWORK 
The proposed development will include a network of overland flow, roof leaders, yard drains, catch 
basins, sediment forebays, filter beds, subsurface infiltration, and detention systems designed to 
accommodate a 25-year storm event with pipes flowing below full capacity.   
No adverse impacts on the downstream drainage patterns are anticipated. 
 


 
 
 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVENUE EXT. 
 
WATERFORD, CONNECTICUT 
 
 
 
 
 
 
APPENDIX A 
DRAINAGE AREA MAPS 
Existing Conditions DA-01A 
Proposed Conditions DA-02A 
Proposed Detention DA 03A 
Proposed Pipe DA-04A (Not Included) 
 


FENGER
BROOK
#12
WF
#11
WF
#10
WF
#9
WF
#8
WF
#7
WF
#6
WF
#5
WF
#4
WF
#1
WF
#26
WF
#25
WF
#24
WF
#23
WF
#22
WF
#21
WF
#3
WF
#19
WF
WF#18
#16
WF
#13,14
WFs
#15
WF
#20
WF
 CENTERLINE STRIPE
DOUBLE YELLOW
 STRIPE
 SHOULDER
SOLID WHITE
 STRIPE
 SHOULDER
SOLID WHITE
24 in. WATER MAIN
12 in. WATER MAIN
12 in. METAL
#4269
EVERSOURCE 
POLE & NEW 
OLD HELTCO 
 IN/OUT=57.47(SE/NW, BOTH 18 in. RCP)
CATCH BASIN, TF=60.87, INV
#4275 w/TRANS.
HELTCO POLE  
#1732 w/LIGHT
HELTCO POLE  
 OUT=60.40 (SE/NW, BOTH 18 in. RCP)
CATCH BASIN, TF=64.25, INV IN=61.95, INV
6 in. GAS MAIN
SMH90
SMH91
SMH92
INV IN=69.76, INV OUT=68.66
CATCH BASIN, TF=72.26
8 in. SANITARY MAIN
 OAK
42 in.
 OAK
42 in.
#17
WF
 15 in. RCP PER REFERENCE MAP #2I)
(NO OTHER VISIBLE PIPES, OUTLET IS
CATCH BASIN, TF=61.27, INV=59.17(NE)
#48
WF
#49
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#50
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#52
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#54
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#64
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#69
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#71
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#72
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#73
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#74
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#75
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WF#76
#77
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#78
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#79-81
WFs
#84
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#85
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#86
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#88
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#87
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#89
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#90
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#91
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#92
WF
#93B
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#93
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#94
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#35
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#28
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#29
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#30
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#31
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#27
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#82
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WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
AREA
WOODED
AREA
WOODED
AREA
WOODED
AREA
WOODED
AREA
WOODED
ROAD
WOODS 
ROAD
WOODS 
ROAD
WOODS 
ROAD
WOODS 
#390
HOUSE 
DECK
YARD
GRASS 
DRIVEWAY
ASPHALT 
SIDEWALK
ASPHALT 
#384
HOUSE 
#396A
BUILDING 
PORCH
BOULDERS
LARGE 
ROCKS AND 
PILE OF 
PILE
DEBRIS 
PILE
BRICK 
PILE
TIRE
MOUND
ROCKY 
NOT SURVEYED
* BUILDING DIGITIZED 
 #396
BUILDING
 #398
BUILDING
OAK
42 in. 
OAK
36 in. 
OAK
48 in. 
S
G
S
S
WG
16
22
22
28
22
22
16
18
22
24
26
28
32
34
36
38
42
44
44
46
48
52
54
56
58
62
64
66
68
72
74
76
74
72
68
66
64
62
58
58
56
54
52
48
46
44
42
38
38
38
36
34
32
28
26
22
18
18
22
24
26
26
24
22
18
16
28
72
48
34
32
28
26
24
28
26
28
28
30
40
50
60
70
70
50
40
30
20
20
20
30
20
30
40
50
20
30
20
 SURVEYED
 DIGITIZED NOT
* BUILDINGS PARTIALLY
20
20
44
60
                           WATERFORD, CT
CONTACT INFORMATION
LEBANON, CONN 06249
191 NORWICH AVENUE
YANTIC RIVER CONSULTANTS, LLC
www.yanticriverconsultants.com
Web:
yanticriver@gmail.com
Email:
(860) 367-7264
Phone:
384 & 394 WILLETTS AVE. EXT.        
SCALE:   1" =   160'
00096 - 001  
 160
0
 160
PROJECT NO:
DATE:
SHEET NO:
11/18/20
DA-01A
                       WATERFORD WOODS                      
                   PREPARED FOR SIG CON ASSOCIATES, LLC                   
        DRAINAGE MAP - EXISTING CONDITIONS SITE ONLY        
73C
73C
3
17
17
3
306
73C
W ILLETTS AVENUE EXTENSION
LEGEND
77(D)
WETLANDS (WOODS)
55
WOODS (GOOD)
58
MEADOW/BRUSH
61
OPEN SPACE (GOOD)
98
IMPERVIOUS
NRCS SOIL
TC PATH - CHANNEL
TC PATH - SHALLOW
TC PATH - SHEET
D.A. LIMIT
CN B
ITEM
WOODS (GOOD) = 6.872
MEADOW/BRUSH (GOOD) = 0.434
OPEN SPACE (GOOD) = 0.818
IMPERVIOUS = 0.058
TOTAL AREA = 8.182 AC
DRAINAGE AREA 'SITE-EX-01'
AREA = 3.609 AC
WETLANDS
AREA = 5.585 AC
WETLANDS
WOODS (GOOD) = 6.764
TOTAL AREA = 6.764 AC
DRAINAGE AREA 'SITE-EX-03'
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
DOWNSTREAM LIMIT OF DRAINAGE
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
DOWNSTREAM LIMIT OF DRAINAGE
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
UPSTREAM LIMIT OF DRAINAGE
WOODS (GOOD) = 2.495
TOTAL AREA = 2.495 AC
DRAINAGE AREA 'SITE-EX-02'
ELEV.= 71±
ELEV.= 60±
MEADOW/WOODS @ 5.5%
SHEET FLOW - 200'
WOODS @ 4.8%
SHALLOW CONC.- 650'
ELEV.= 44±
ELEV.= 34±
ELEV. = 29±
INLAND WETLANDS
DISCHARGE POINT AT
ELEV. = 22±
INLAND WETLANDS
DISCHARGE POINT AT
MEADOW/WOODS @ 5.0%
SHEET FLOW - 200'
WOODS @ 5.7%
SHALLOW CONC.- 210'
BOUNDARY
NRCS SOIL


FENGER
BROOK
#12
WF
#11
WF
#10
WF
#9
WF
#8
WF
#7
WF
#6
WF
#5
WF
#4
WF
#1
WF
#26
WF
#25
WF
#24
WF
#23
WF
#22
WF
#21
WF
#3
WF
#19
WF
WF#18
#16
WF
#13,14
WFs
#15
WF
#20
WF
 CENTERLINE STRIPE
DOUBLE YELLOW
 STRIPE
 SHOULDER
SOLID WHITE
 STRIPE
 SHOULDER
SOLID WHITE
 OAK
42 in.
 OAK
42 in.
#17
WF
#48
WF
#49
WF
#50
WF
#52
WF
#53
WF
#54
WF
#55
WF
#56
WF
#57
WF
#58
WF
#59
WF
#60
WF
#61
WF
#62
WF
#63
WF
#64
WF
#65
WF
#66
WF
#67
WF
#68
WF
#69
WF
#70
WF
#71
WF
#72
WF
#73
WF
#74
WF
#75
WF
WF#76
#77
WF
#78
WF
#79-81
WFs
#84
WF
#85
WF
#86
WF
#88
WF
#87
WF
#89
WF
#90
WF
#91
WF
#92
WF
#93B
WF
#93
WF
#94
WF
#35
WF
#28
WF
#29
WF
#30
WF
#31
WF
#32
WF
#33
WF
#27
WF
#34
WF
#36
WF
#37
WF
#38
WF
#39
WF
#40
WF
#41
WF
#42
WF
#43
WF
#44
WF
#45
WF
#46
WF
#47
WF
#82
WF
#83
WF
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
AREA
WOODED
AREA
WOODED
AREA
WOODED
AREA
WOODED
AREA
WOODED
ROAD
WOODS 
ROAD
WOODS 
ROAD
WOODS 
ROAD
WOODS 
#390
HOUSE 
DECK
YARD
GRASS 
DRIVEWAY
ASPHALT 
SIDEWALK
ASPHALT 
#384
HOUSE 
#396A
BUILDING 
PORCH
BOULDERS
LARGE 
ROCKS AND 
PILE OF 
PILE
DEBRIS 
PILE
BRICK 
PILE
TIRE
MOUND
ROCKY 
NOT SURVEYED
* BUILDING DIGITIZED 
 #396
BUILDING
 #398
BUILDING
OAK
42 in. 
OAK
36 in. 
OAK
48 in. 
S
G
S
S
WG
16
22
22
28
22
22
16
18
22
24
26
28
32
34
36
38
42
44
44
46
48
52
54
56
58
62
64
66
68
72
74
76
74
72
68
66
64
62
58
58
56
54
52
48
46
44
42
38
38
38
36
34
32
28
26
22
18
18
22
24
26
26
24
22
18
16
28
72
48
34
32
28
26
24
28
26
28
28
30
40
50
60
70
70
50
40
30
20
20
20
30
20
30
40
50
20
30
20
 SURVEYED
 DIGITIZED NOT
* BUILDINGS PARTIALLY
20
20
44
60
                           WATERFORD, CT
CONTACT INFORMATION
LEBANON, CONN 06249
191 NORWICH AVENUE
YANTIC RIVER CONSULTANTS, LLC
www.yanticriverconsultants.com
Web:
yanticriver@gmail.com
Email:
(860) 367-7264
Phone:
384 & 394 WILLETTS AVE. EXT.        
SCALE:   1" =   160'
00096 - 001  
 160
0
 160
PROJECT NO:
DATE:
SHEET NO:
09/21/21
DA-02A
                       WATERFORD WOODS                      
                   PREPARED FOR SIG CON ASSOCIATES, LLC                   
        DRAINAGE MAP - PROPOSED CONDITIONS SITE ONLY        
73C
73C
3
17
17
3
306
73C
50
50
30
60
40
30
30
30
50
60
40
40
40
30
30
30
20
20
W ILLETTS AVENUE EXTENSION
LEGEND
77(D)
WETLANDS (WOODS)
55
WOODS (GOOD)
58
MEADOW/BRUSH
61
OPEN SPACE (GOOD)
98
IMPERVIOUS
NRCS SOIL
TC PATH - CHANNEL
TC PATH - SHALLOW
TC PATH - SHEET
D.A. LIMIT
CN B
ITEM
AREA = 3.609 AC
WETLANDS
AREA = 5.585 AC
WETLANDS
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
DOWNSTREAM LIMIT OF DRAINAGE
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
DOWNSTREAM LIMIT OF DRAINAGE
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
UPSTREAM LIMIT OF DRAINAGE
ELEV.= 68±
ELEV.= 59±
GRASS @ 3.3%
SHALLOW CONC.- 900'
ELEV. = 29±
INLAND WETLANDS
DISCHARGE POINT AT
ELEV. = 22±
INLAND WETLANDS
DISCHARGE POINT AT
ELEV.= 71±
ELEV.= 48±
ELEV.= 62±
ELEV.= 53±
GRASS @ 4.5%
SHEET FLOW - 200'
GRASS @ 4.5%
SHALLOW CONC.- 200'
930' @ 3.3%
SHALLOW CONC.
WOODS (GOOD) = 0.887
MEADOW / BRUSH = 0.446
OPEN SPACE (GOOD) = 1.136
IMPERVIOUS = 1.486
TOTAL AREA = 3.955 AC
DRAINAGE AREA 'SITE-PR-02'
WOODS (GOOD) = 1.270
MEADOW / BRUSH = 0.544
OPEN SPACE (GOOD) = 3.124
IMPERVIOUS = 1.710
TOTAL AREA = 6.648 AC
DRAINAGE AREA 'SITE-PR-01'
ELEV.= 29±
ELEV.= 21±
ELEV.= 28±
ELEV.= 17±
250' @ 4%
SHALLOW CONC.
100' @ 1%
SHEET FLOW
150' @ 5%
SHEET FLOW
200' @ 4.5%
SHEET FLOW
WOODS (GOOD) = 1.296
MEADOW / BRUSH = 0.203
OPEN SPACE (GOOD) = 0.929
IMPERVIOUS = 0.287
TOTAL AREA = 2.715 AC
DRAINAGE AREA 'SITE-PR-03A'
WOODS (GOOD) = 1.399
MEADOW / BRUSH = 0.322
OPEN SPACE (GOOD) = 1.935
IMPERVIOUS = 0.467
TOTAL AREA = 4.123 AC
DRAINAGE AREA 'SITE-PR-03B'
BOUNDARY
NRCS SOIL
200' @ 1.5%
SHALLOW CONC.
ELEV.= 27.5±


FENGER
BROOK
#12
WF
#11
WF
#10
WF
#9
WF
#8
WF
#7
WF
#6
WF
#5
WF
#4
WF
#1
WF
#26
WF
#25
WF
#24
WF
#23
WF
#22
WF
#21
WF
#3
WF
#19
WF
WF#18
#16
WF
#13,14
WFs
#15
WF
#20
WF
 CENTERLINE STRIPE
DOUBLE YELLOW
 STRIPE
 SHOULDER
SOLID WHITE
 STRIPE
 SHOULDER
SOLID WHITE
 OAK
42 in.
 OAK
42 in.
#17
WF
#48
WF
#49
WF
#50
WF
#52
WF
#53
WF
#54
WF
#55
WF
#56
WF
#57
WF
#58
WF
#59
WF
#60
WF
#61
WF
#62
WF
#63
WF
#64
WF
#65
WF
#66
WF
#67
WF
#68
WF
#69
WF
#70
WF
#71
WF
#72
WF
#73
WF
#74
WF
#75
WF
WF#76
#77
WF
#78
WF
#79-81
WFs
#84
WF
#85
WF
#86
WF
#88
WF
#87
WF
#89
WF
#90
WF
#91
WF
#92
WF
#93B
WF
#93
WF
#94
WF
#35
WF
#28
WF
#29
WF
#30
WF
#31
WF
#32
WF
#33
WF
#27
WF
#34
WF
#36
WF
#37
WF
#38
WF
#39
WF
#40
WF
#41
WF
#42
WF
#43
WF
#44
WF
#45
WF
#46
WF
#47
WF
#82
WF
#83
WF
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
WETLAND AREA
WOODED 
AREA
WOODED
AREA
WOODED
AREA
WOODED
AREA
WOODED
AREA
WOODED
ROAD
WOODS 
ROAD
WOODS 
ROAD
WOODS 
ROAD
WOODS 
#390
HOUSE 
DECK
YARD
GRASS 
DRIVEWAY
ASPHALT 
SIDEWALK
ASPHALT 
#384
HOUSE 
#396A
BUILDING 
PORCH
BOULDERS
LARGE 
ROCKS AND 
PILE OF 
PILE
DEBRIS 
PILE
BRICK 
PILE
TIRE
MOUND
ROCKY 
NOT SURVEYED
* BUILDING DIGITIZED 
 #396
BUILDING
 #398
BUILDING
OAK
42 in. 
OAK
36 in. 
OAK
48 in. 
S
G
S
S
WG
16
22
22
28
22
22
16
18
22
24
26
28
32
34
36
38
42
44
44
46
48
52
54
56
58
62
64
66
68
72
74
76
74
72
68
66
64
62
58
58
56
54
52
48
46
44
42
38
38
38
36
34
32
28
26
22
18
18
22
24
26
26
24
22
18
16
28
72
48
34
32
28
26
24
28
26
28
28
30
40
50
60
70
70
50
40
30
20
20
20
30
20
30
40
50
20
30
20
 SURVEYED
 DIGITIZED NOT
* BUILDINGS PARTIALLY
20
20
44
60
                           WATERFORD, CT
CONTACT INFORMATION
LEBANON, CONN 06249
191 NORWICH AVENUE
YANTIC RIVER CONSULTANTS, LLC
www.yanticriverconsultants.com
Web:
yanticriver@gmail.com
Email:
(860) 367-7264
Phone:
384 & 394 WILLETTS AVE. EXT.        
SCALE:   1" =   160'
00096 - 001  
 160
0
 160
PROJECT NO:
DATE:
SHEET NO:
09/21/21
DA-03A
                       WATERFORD WOODS                      
                   PREPARED FOR SIG CON ASSOCIATES, LLC                   
              DRAINAGE MAP - PROPOSED DETENTION             
73C
73C
3
17
17
3
306
73C
W ILLETTS AVENUE EXTENSION
LEGEND
77(D)
WETLANDS (WOODS)
55
WOODS (GOOD)
58
MEADOW/BRUSH
61
OPEN SPACE (GOOD)
98
IMPERVIOUS
NRCS SOIL
TC PATH - CHANNEL
TC PATH - SHALLOW
TC PATH - SHEET
D.A. LIMIT
CN B
ITEM
AREA = 3.609 AC
WETLANDS
AREA = 5.585 AC
WETLANDS
BOUNDARY
NRCS SOIL
WOODS (GOOD) = 0.000
OPEN SPACE (GOOD) = 0.345
IMPERVIOUS = 0.572
TOTAL AREA = 0.917 AC
DRAINAGE AREA 'INF-01B'
WOODS (GOOD) = 0.314
MEADOW/BRUSH = 0.403
OPEN SPACE (GOOD) = 2.430
IMPERVIOUS = 1.138
TOTAL AREA = 4.285 AC
DRAINAGE AREA 'POND-01A'
WOODS (GOOD) = 0.956
MEADOW/BRUSH = 0.141
OPEN SPACE (GOOD) = 0.349
IMPERVIOUS = 0.000
TOTAL AREA = 1.446 AC
DRAINAGE AREA 'PR-01A'
WOODS (GOOD) = 0.000
MEADOW/BRUSH = 0.368
OPEN SPACE (GOOD) = 1.076
IMPERVIOUS = 1.486
TOTAL AREA = 2.930 AC
DRAINAGE AREA 'POND-02A'
WOODS (GOOD) = 0.887
MEADOW/BRUSH = 0.078
OPEN SPACE (GOOD) = 0.060
IMPERVIOUS = 0.000
TOTAL AREA = 1.025 AC
DRAINAGE AREA 'PR-02A'
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
DOWNSTREAM LIMIT OF DRAINAGE
FOR HYDROLOGIC ANALYSIS
AREA FOLLOWS PROPERTY LINE
DOWNSTREAM LIMIT OF DRAINAGE
1,400 SF
FB-03B
1,000 SF
FB-03A
1,500 SF
FB-01A
2,100 SF
FB-01A
WOODS (GOOD) = 1.296
MEADOW / BRUSH = 0.203
OPEN SPACE (GOOD) = 0.929
IMPERVIOUS = 0.287
TOTAL AREA = 2.715 AC
DRAINAGE AREA 'SITE-PR-03A'
WOODS (GOOD) = 1.399
MEADOW / BRUSH = 0.322
OPEN SPACE (GOOD) = 1.935
IMPERVIOUS = 0.467
TOTAL AREA = 4.123 AC
DRAINAGE AREA 'SITE-PR-03B'


 
 
 
WATERFORD WOODS APARTMENTS 
 
384 & 394 WILLETTS AVENUE EXT. 
 
WATERFORD, CONNECTICUT 
 
 
 
 
 
 
APPENDIX B 
HYDROLOGIC COMPUTATIONS 
HYDROLOGY STUDIO REPORT 
 


Table of Contents
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Basin Model Schematic
1
......................................................................................................................................
Hydrograph by Return Period
2
............................................................................................................................
2 - Year
Hydrograph Summary
3
..................................................................................................................................
5 - Year
Hydrograph Summary
4
..................................................................................................................................
10 - Year
Hydrograph Summary
5
..................................................................................................................................
25 - Year
Hydrograph Summary
6
..................................................................................................................................
50 - Year
Hydrograph Summary
7
..................................................................................................................................
100 - Year
Hydrograph Summary
8
..................................................................................................................................
IDF Report
9
...........................................................................................................................................................
Precipitation Report
10
..........................................................................................................................................

Basin Model
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
1

Hydrograph by Return Period
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Hyd.
No.
Hydrograph
Type
Hydrograph
Name
Peak Outflow (cfs)
1-yr
2-yr
3-yr
5-yr
10-yr
25-yr
50-yr
100-yr
1
NRCS Runoff
EX-01
9.328
20.10
30.75
47.38
60.64
75.64
2
NRCS Runoff
PR-01
14.24
27.12
39.27
57.79
72.27
88.49
3
NRCS Runoff
SITE-EX-01
1.146
3.092
5.196
8.632
11.45
14.69
4
NRCS Runoff
SITE-EX-02
0.299
0.861
1.486
2.519
3.372
4.359
5
NRCS Runoff
SITE-EX-03
0.811
2.335
4.028
6.830
9.141
11.82
6
Junction
SITE-EX
2.256
6.287
10.71
17.98
23.95
30.85
7
NRCS Runoff
SITE-PR-01
3.839
6.658
9.239
13.08
16.05
19.32
8
NRCS Runoff
SITE-PR-02
3.197
5.202
6.987
9.602
11.59
13.77
9
NRCS Runoff
SITE-PR-03B
1.784
3.638
5.414
8.148
10.30
12.72
10
NRCS Runoff
SITE-PR-03A
0.990
2.069
3.121
4.754
6.042
7.500
11
Junction
SITE-PR-03
2.749
5.667
8.480
12.83
16.25
20.09
12
Junction
SITE-PR
9.611
17.08
23.98
34.35
42.39
51.31
13
Pond Route
POND-PR-01
0.440
1.941
3.333
4.762
9.363
11.07
14
Pond Route
POND-PR-02
0.309
0.601
1.665
3.252
4.049
4.752
15
Pond Route
POND-PR-03A
0.146
0.376
1.172
2.049
3.317
4.587
16
Pond Route
POND-PR-03B
0.143
0.455
1.554
3.344
4.490
6.009
17
Junction
POND-PR-03
0.282
0.829
2.726
5.386
7.807
10.59
18
Junction
SITE-PR-DET
1.024
3.236
7.477
13.09
20.44
25.98
19
NRCS Runoff
PR-01A
0.271
0.716
1.197
1.976
2.609
3.333
20
NRCS Runoff
POND-01A
2.649
4.515
6.210
8.727
10.66
12.78
21
NRCS Runoff
INF-01B
1.901
2.702
3.376
4.325
5.024
5.775
22
NRCS Runoff
PR-02A
0.160
0.449
0.772
1.305
1.742
2.242
23
NRCS Runoff
POND-02A
3.352
5.023
6.461
8.511
10.04
11.69
24
NRCS Runoff
POND-03A
0.990
2.069
3.121
4.754
6.042
7.500
25
NRCS Runoff
POND-03B
1.784
3.638
5.414
8.148
10.30
12.72
26
Pond Route
INF-PR-01B
0.729
1.646
2.396
3.112
4.106
4.939
27
Pond Route
POND-PR-01A
0.325
0.603
1.740
3.237
4.060
4.800
28
Junction
SITE-PR-01A
0.999
2.334
3.689
5.379
6.878
8.783
29
Pond Route
POND-PR-02A
0.325
0.569
1.517
2.943
3.695
4.290
30
Pond Route
POND-PR-03A1
0.146
0.376
1.172
2.049
3.317
4.587
31
Pond Route
POND-PR-03B1
0.143
0.455
1.554
3.344
4.490
6.009
32
Junction
SITE-PR-02A
0.370
0.732
1.725
3.421
4.395
5.352
33
Junction
SITE-PR-03A
0.282
0.829
2.726
5.386
7.807
10.59
34
Junction
SITE-PR-DET-A
1.316
3.277
6.737
13.56
18.56
24.28
35
Junction
CALC-PR-03
2.749
5.667
8.480
12.83
16.25
20.09
2

Hydrograph 2-yr Summary
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Hyd.
No.
Hydrograph
Type
Hydrograph
Name
Peak
Flow
(cfs)
Time to
Peak
(hrs)
Hydrograph
Volume
(cuft)
Inflow
Hyd(s)
Maximum
Elevation
(ft)
Maximum
Storage
(cuft)
1
NRCS Runoff
EX-01
9.328
12.65
78,149
----
2
NRCS Runoff
PR-01
14.24
12.58
102,734
----
3
NRCS Runoff
SITE-EX-01
1.146
12.60
10,688
----
4
NRCS Runoff
SITE-EX-02
0.299
12.60
2,921
----
5
NRCS Runoff
SITE-EX-03
0.811
12.60
7,918
----
6
Junction
SITE-EX
2.256
12.60
21,526
3, 4, 5
7
NRCS Runoff
SITE-PR-01
3.839
12.42
22,180
----
8
NRCS Runoff
SITE-PR-02
3.197
12.32
16,284
----
9
NRCS Runoff
SITE-PR-03B
1.784
12.25
9,476
----
10
NRCS Runoff
SITE-PR-03A
0.990
12.33
5,756
----
11
Junction
SITE-PR-03
2.749
12.28
15,233
9, 10
12
Junction
SITE-PR
9.611
12.33
53,697
7, 8, 11
13
Pond Route
POND-PR-01
0.440
15.08
16,604
7
31.43
10,499
14
Pond Route
POND-PR-02
0.309
14.82
9,517
8
29.21
8,345
15
Pond Route
POND-PR-03A
0.146
13.70
2,250
10
21.57
1,958
16
Pond Route
POND-PR-03B
0.143
14.62
2,506
9
18.54
3,878
17
Junction
POND-PR-03
0.282
14.07
4,756
15, 16
18
Junction
SITE-PR-DET
1.024
14.32
30,878
13, 14, 17
19
NRCS Runoff
PR-01A
0.271
12.38
1,976
----
20
NRCS Runoff
POND-01A
2.649
12.40
15,096
----
21
NRCS Runoff
INF-01B
1.901
12.10
6,111
----
22
NRCS Runoff
PR-02A
0.160
12.42
1,256
----
23
NRCS Runoff
POND-02A
3.352
12.30
16,364
----
24
NRCS Runoff
POND-03A
0.990
12.33
5,756
----
25
NRCS Runoff
POND-03B
1.784
12.25
9,476
----
26
Pond Route
INF-PR-01B
0.729
12.35
3,860
21
30.17
1,813
27
Pond Route
POND-PR-01A
0.325
14.53
9,965
20
30.94
7,025
28
Junction
SITE-PR-01A
0.999
12.37
15,801
19, 26, 27
29
Pond Route
POND-PR-02A
0.325
14.23
9,552
23
29.27
8,725
30
Pond Route
POND-PR-03A1
0.146
13.70
2,250
24
21.57
1,958
31
Pond Route
POND-PR-03B1
0.143
14.62
2,506
25
18.54
3,878
32
Junction
SITE-PR-02A
0.370
13.75
10,808
22, 29
33
Junction
SITE-PR-03A
0.282
14.07
4,756
30, 31
34
Junction
SITE-PR-DET-A
1.316
13.12
31,365
28, 32, 33
35
Junction
CALC-PR-03
2.749
12.28
15,233
24, 25
3

Hydrograph 5-yr Summary
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Hyd.
No.
Hydrograph
Type
Hydrograph
Name
Peak
Flow
(cfs)
Time to
Peak
(hrs)
Hydrograph
Volume
(cuft)
Inflow
Hyd(s)
Maximum
Elevation
(ft)
Maximum
Storage
(cuft)
1
NRCS Runoff
EX-01
20.10
12.58
143,800
----
2
NRCS Runoff
PR-01
27.12
12.53
177,649
----
3
NRCS Runoff
SITE-EX-01
3.092
12.52
21,793
----
4
NRCS Runoff
SITE-EX-02
0.861
12.50
6,121
----
5
NRCS Runoff
SITE-EX-03
2.335
12.50
16,594
----
6
Junction
SITE-EX
6.287
12.50
44,508
3, 4, 5
7
NRCS Runoff
SITE-PR-01
6.658
12.38
36,401
----
8
NRCS Runoff
SITE-PR-02
5.202
12.30
25,635
----
9
NRCS Runoff
SITE-PR-03B
3.638
12.22
16,874
----
10
NRCS Runoff
SITE-PR-03A
2.069
12.27
10,415
----
11
Junction
SITE-PR-03
5.667
12.23
27,289
9, 10
12
Junction
SITE-PR
17.08
12.32
89,325
7, 8, 11
13
Pond Route
POND-PR-01
1.941
12.98
30,386
7
32.02
14,746
14
Pond Route
POND-PR-02
0.601
14.00
18,336
8
29.95
13,176
15
Pond Route
POND-PR-03A
0.376
13.08
6,532
10
22.22
3,644
16
Pond Route
POND-PR-03B
0.455
13.42
9,096
9
19.59
6,556
17
Junction
POND-PR-03
0.829
13.12
15,628
15, 16
18
Junction
SITE-PR-DET
3.236
13.03
64,350
13, 14, 17
19
NRCS Runoff
PR-01A
0.716
12.28
3,964
----
20
NRCS Runoff
POND-01A
4.515
12.37
24,504
----
21
NRCS Runoff
INF-01B
2.702
12.10
8,728
----
22
NRCS Runoff
PR-02A
0.449
12.30
2,592
----
23
NRCS Runoff
POND-02A
5.023
12.28
24,286
----
24
NRCS Runoff
POND-03A
2.069
12.27
10,415
----
25
NRCS Runoff
POND-03B
3.638
12.22
16,874
----
26
Pond Route
INF-PR-01B
1.646
12.20
6,216
21
30.55
2,215
27
Pond Route
POND-PR-01A
0.603
14.03
18,809
20
31.63
11,899
28
Junction
SITE-PR-01A
2.334
12.23
28,988
19, 26, 27
29
Pond Route
POND-PR-02A
0.569
13.75
16,992
23
29.94
13,060
30
Pond Route
POND-PR-03A1
0.376
13.08
6,532
24
22.22
3,644
31
Pond Route
POND-PR-03B1
0.455
13.42
9,096
25
19.59
6,556
32
Junction
SITE-PR-02A
0.732
12.40
19,584
22, 29
33
Junction
SITE-PR-03A
0.829
13.12
15,628
30, 31
34
Junction
SITE-PR-DET-A
3.277
12.37
64,201
28, 32, 33
35
Junction
CALC-PR-03
5.667
12.23
27,289
24, 25
4

Hydrograph 10-yr Summary
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Hyd.
No.
Hydrograph
Type
Hydrograph
Name
Peak
Flow
(cfs)
Time to
Peak
(hrs)
Hydrograph
Volume
(cuft)
Inflow
Hyd(s)
Maximum
Elevation
(ft)
Maximum
Storage
(cuft)
1
NRCS Runoff
EX-01
30.75
12.55
207,139
----
2
NRCS Runoff
PR-01
39.27
12.50
247,960
----
3
NRCS Runoff
SITE-EX-01
5.196
12.47
32,965
----
4
NRCS Runoff
SITE-EX-02
1.486
12.45
9,376
----
5
NRCS Runoff
SITE-EX-03
4.028
12.45
25,418
----
6
Junction
SITE-EX
10.71
12.47
67,759
3, 4, 5
7
NRCS Runoff
SITE-PR-01
9.239
12.37
49,425
----
8
NRCS Runoff
SITE-PR-02
6.987
12.30
34,026
----
9
NRCS Runoff
SITE-PR-03B
5.414
12.22
23,910
----
10
NRCS Runoff
SITE-PR-03A
3.121
12.25
14,877
----
11
Junction
SITE-PR-03
8.480
12.23
38,786
9, 10
12
Junction
SITE-PR
23.98
12.30
122,237
7, 8, 11
13
Pond Route
POND-PR-01
3.333
12.87
43,151
7
32.53
18,920
14
Pond Route
POND-PR-02
1.665
12.92
26,481
8
30.28
15,676
15
Pond Route
POND-PR-03A
1.172
12.67
10,780
10
22.58
4,776
16
Pond Route
POND-PR-03B
1.554
12.67
15,636
9
19.92
8,554
17
Junction
POND-PR-03
2.726
12.67
26,416
15, 16
18
Junction
SITE-PR-DET
7.477
12.78
96,048
13, 14, 17
19
NRCS Runoff
PR-01A
1.197
12.25
5,950
----
20
NRCS Runoff
POND-01A
6.210
12.37
33,075
----
21
NRCS Runoff
INF-01B
3.376
12.08
10,967
----
22
NRCS Runoff
PR-02A
0.772
12.27
3,943
----
23
NRCS Runoff
POND-02A
6.461
12.28
31,190
----
24
NRCS Runoff
POND-03A
3.121
12.25
14,877
----
25
NRCS Runoff
POND-03B
5.414
12.22
23,910
----
26
Pond Route
INF-PR-01B
2.396
12.18
8,314
21
30.83
2,484
27
Pond Route
POND-PR-01A
1.740
12.97
27,135
20
31.97
14,369
28
Junction
SITE-PR-01A
3.689
12.20
41,399
19, 26, 27
29
Pond Route
POND-PR-02A
1.517
12.88
23,664
23
30.24
15,386
30
Pond Route
POND-PR-03A1
1.172
12.67
10,780
24
22.58
4,776
31
Pond Route
POND-PR-03B1
1.554
12.67
15,636
25
19.92
8,554
32
Junction
SITE-PR-02A
1.725
12.83
27,607
22, 29
33
Junction
SITE-PR-03A
2.726
12.67
26,416
30, 31
34
Junction
SITE-PR-DET-A
6.737
12.77
95,422
28, 32, 33
35
Junction
CALC-PR-03
8.480
12.23
38,786
24, 25
5

Hydrograph 25-yr Summary
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Hyd.
No.
Hydrograph
Type
Hydrograph
Name
Peak
Flow
(cfs)
Time to
Peak
(hrs)
Hydrograph
Volume
(cuft)
Inflow
Hyd(s)
Maximum
Elevation
(ft)
Maximum
Storage
(cuft)
1
NRCS Runoff
EX-01
47.38
12.52
305,899
----
2
NRCS Runoff
PR-01
57.79
12.48
355,425
----
3
NRCS Runoff
SITE-EX-01
8.632
12.43
50,903
----
4
NRCS Runoff
SITE-EX-02
2.519
12.42
14,640
----
5
NRCS Runoff
SITE-EX-03
6.830
12.42
39,689
----
6
Junction
SITE-EX
17.98
12.42
105,232
3, 4, 5
7
NRCS Runoff
SITE-PR-01
13.08
12.35
68,975
----
8
NRCS Runoff
SITE-PR-02
9.602
12.28
46,433
----
9
NRCS Runoff
SITE-PR-03B
8.148
12.20
34,767
----
10
NRCS Runoff
SITE-PR-03A
4.754
12.25
21,797
----
11
Junction
SITE-PR-03
12.83
12.22
56,564
9, 10
12
Junction
SITE-PR
34.35
12.28
171,972
7, 8, 11
13
Pond Route
POND-PR-01
4.762
12.85
62,373
7
33.37
26,255
14
Pond Route
POND-PR-02
3.252
12.75
38,596
8
30.80
19,854
15
Pond Route
POND-PR-03A
2.049
12.62
17,444
10
23.14
6,635
16
Pond Route
POND-PR-03B
3.344
12.55
25,942
9
20.36
11,202
17
Junction
POND-PR-03
5.386
12.57
43,386
15, 16
18
Junction
SITE-PR-DET
13.09
12.70
144,356
13, 14, 17
19
NRCS Runoff
PR-01A
1.976
12.23
9,126
----
20
NRCS Runoff
POND-01A
8.727
12.35
45,889
----
21
NRCS Runoff
INF-01B
4.325
12.08
14,165
----
22
NRCS Runoff
PR-02A
1.305
12.23
6,119
----
23
NRCS Runoff
POND-02A
8.511
12.28
41,182
----
24
NRCS Runoff
POND-03A
4.754
12.25
21,797
----
25
NRCS Runoff
POND-03B
8.148
12.20
34,767
----
26
Pond Route
INF-PR-01B
3.112
12.17
11,352
21
31.27
2,861
27
Pond Route
POND-PR-01A
3.237
12.83
39,657
20
32.49
18,542
28
Junction
SITE-PR-01A
5.379
12.20
60,135
19, 26, 27
29
Pond Route
POND-PR-02A
2.943
12.73
33,385
23
30.67
18,799
30
Pond Route
POND-PR-03A1
2.049
12.62
17,444
24
23.14
6,635
31
Pond Route
POND-PR-03B1
3.344
12.55
25,942
25
20.36
11,202
32
Junction
SITE-PR-02A
3.421
12.62
39,504
22, 29
33
Junction
SITE-PR-03A
5.386
12.57
43,386
30, 31
34
Junction
SITE-PR-DET-A
13.56
12.55
143,026
28, 32, 33
35
Junction
CALC-PR-03
12.83
12.22
56,564
24, 25
6

Hydrograph 50-yr Summary
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Hyd.
No.
Hydrograph
Type
Hydrograph
Name
Peak
Flow
(cfs)
Time to
Peak
(hrs)
Hydrograph
Volume
(cuft)
Inflow
Hyd(s)
Maximum
Elevation
(ft)
Maximum
Storage
(cuft)
1
NRCS Runoff
EX-01
60.64
12.52
384,652
----
2
NRCS Runoff
PR-01
72.27
12.48
439,881
----
3
NRCS Runoff
SITE-EX-01
11.45
12.42
65,512
----
4
NRCS Runoff
SITE-EX-02
3.372
12.40
18,948
----
5
NRCS Runoff
SITE-EX-03
9.141
12.40
51,370
----
6
Junction
SITE-EX
23.95
12.40
135,830
3, 4, 5
7
NRCS Runoff
SITE-PR-01
16.05
12.35
84,136
----
8
NRCS Runoff
SITE-PR-02
11.59
12.28
55,950
----
9
NRCS Runoff
SITE-PR-03B
10.30
12.20
43,361
----
10
NRCS Runoff
SITE-PR-03A
6.042
12.23
27,294
----
11
Junction
SITE-PR-03
16.25
12.22
70,655
9, 10
12
Junction
SITE-PR
42.39
12.28
210,741
7, 8, 11
13
Pond Route
POND-PR-01
9.363
12.70
77,339
7
33.75
29,752
14
Pond Route
POND-PR-02
4.049
12.73
47,913
8
31.21
23,494
15
Pond Route
POND-PR-03A
3.317
12.53
22,758
10
23.48
7,959
16
Pond Route
POND-PR-03B
4.490
12.53
34,116
9
20.71
13,717
17
Junction
POND-PR-03
7.807
12.53
56,875
15, 16
18
Junction
SITE-PR-DET
20.44
12.67
182,127
13, 14, 17
19
NRCS Runoff
PR-01A
2.609
12.23
11,704
----
20
NRCS Runoff
POND-01A
10.66
12.35
55,799
----
21
NRCS Runoff
INF-01B
5.024
12.08
16,557
----
22
NRCS Runoff
PR-02A
1.742
12.23
7,895
----
23
NRCS Runoff
POND-02A
10.04
12.28
48,727
----
24
NRCS Runoff
POND-03A
6.042
12.23
27,294
----
25
NRCS Runoff
POND-03B
10.30
12.20
43,361
----
26
Pond Route
INF-PR-01B
4.106
12.15
13,642
21
31.58
3,065
27
Pond Route
POND-PR-01A
4.060
12.82
49,371
20
32.93
22,186
28
Junction
SITE-PR-01A
6.878
12.17
74,718
19, 26, 27
29
Pond Route
POND-PR-02A
3.695
12.70
40,746
23
31.02
21,611
30
Pond Route
POND-PR-03A1
3.317
12.53
22,758
24
23.48
7,959
31
Pond Route
POND-PR-03B1
4.490
12.53
34,116
25
20.71
13,717
32
Junction
SITE-PR-02A
4.395
12.55
48,641
22, 29
33
Junction
SITE-PR-03A
7.807
12.53
56,875
30, 31
34
Junction
SITE-PR-DET-A
18.56
12.50
180,234
28, 32, 33
35
Junction
CALC-PR-03
16.25
12.22
70,655
24, 25
7

Hydrograph 100-yr Summary
Project Name: Waterford Woods
Hydrology Studio v 3.0.0.20
09-21-2021
Hyd.
No.
Hydrograph
Type
Hydrograph
Name
Peak
Flow
(cfs)
Time to
Peak
(hrs)
Hydrograph
Volume
(cuft)
Inflow
Hyd(s)
Maximum
Elevation
(ft)
Maximum
Storage
(cuft)
1
NRCS Runoff
EX-01
75.64
12.50
474,030
----
2
NRCS Runoff
PR-01
88.49
12.47
534,803
----
3
NRCS Runoff
SITE-EX-01
14.69
12.40
82,325
----
4
NRCS Runoff
SITE-EX-02
4.359
12.38
23,924
----
5
NRCS Runoff
SITE-EX-03
11.82
12.38
64,858
----
6
Junction
SITE-EX
30.85
12.38
171,106
3, 4, 5
7
NRCS Runoff
SITE-PR-01
19.32
12.35
101,027
----
8
NRCS Runoff
SITE-PR-02
13.77
12.28
66,474
----
9
NRCS Runoff
SITE-PR-03B
12.72
12.20
53,064
----
10
NRCS Runoff
SITE-PR-03A
7.500
12.23
33,517
----
11
Junction
SITE-PR-03
20.09
12.22
86,582
9, 10
12
Junction
SITE-PR
51.31
12.28
254,081
7, 8, 11
13
Pond Route
POND-PR-01
11.07
12.70
94,057
7
34.14
33,553
14
Pond Route
POND-PR-02
4.752
12.73
58,235
8
31.65
27,804
15
Pond Route
POND-PR-03A
4.587
12.48
28,796
10
23.77
9,132
16
Pond Route
POND-PR-03B
6.009
12.50
43,391
9
21.03
16,203
17
Junction
POND-PR-03
10.59
12.48
72,187
15, 16
18
Junction
SITE-PR-DET
25.98
12.58
224,479
13, 14, 17
19
NRCS Runoff
PR-01A
3.333
12.22
14,665
----
20
NRCS Runoff
POND-01A
12.78
12.35
66,817
----
21
NRCS Runoff
INF-01B
5.775
12.08
19,159
----
22
NRCS Runoff
PR-02A
2.242
12.23
9,942
----
23
NRCS Runoff
POND-02A
11.69
12.28
56,985
----
24
NRCS Runoff
POND-03A
7.500
12.23
33,517
----
25
NRCS Runoff
POND-03B
12.72
12.20
53,064
----
26
Pond Route
INF-PR-01B
4.939
12.15
16,148
21
31.82
3,209
27
Pond Route
POND-PR-01A
4.800
12.82
60,192
20
33.40
26,496
28
Junction
SITE-PR-01A
8.783
12.33
91,006
19, 26, 27
29
Pond Route
POND-PR-02A
4.290
12.70
48,819
23
31.35
24,885
30
Pond Route
POND-PR-03A1
4.587
12.48
28,796
24
23.77
9,132
31
Pond Route
POND-PR-03B1
6.009
12.50
43,391
25
21.03
16,