6-BRE911312B TRK Final APPENDIX II H&H Stormwater_Report.pdf

PDF 2 MB Posted Jul 8, 2024

Attached to: Bre911312B Nutrient Reduction Wetland
Solicitation number: 009-RFBW-CY24-04
Issued by: Black Hawk County, Iowa

About this file

Written by GovTribe AI · May 20, 2025

This document is a Storm Water Calculations report prepared by Shive-Hattery for the Iowa Department of Agriculture and Land Stewardship, detailing a wetland construction project in Bremer County. The proposed project involves constructing a wetland southeast of Waverly, Iowa, specifically in the NW quarter of Section 12, Township 91 North, Range 13 West. The project includes building a dam to impound water, with a water control structure featuring a 48" circular CMP riser and stop logs for water elevation control. The wetland is designed to meet NRCS standards, with a principal spillway capable of handling 5-year and 25-year storm events, and a freeboard design accommodating 100-year storm events. The construction is planned to create an 8.0-acre normal pool area within a total 23.9-acre drainage area, with an expected impoundment life of 614 years based on sediment calculations.

The project incorporates specific engineering specifications, including an 18-inch Dual Wall HDPE pipe with a slope of 0.11% for tile diversion, side slopes designed at a 3:1 ratio, and an embankment with a 12-foot top width. The geotechnical investigation revealed soil layers consisting of topsoil, clay, and a deeper sand layer, with excavation depths carefully specified to maintain soil integrity. The wetland is designed with water quality improvement goals, including a drawdown capability that meets NRCS requirements and promotes emergent vegetation. The project anticipates capturing approximately 41.8 tons of sediment annually, with 90% of the pool area having depths between 0-24 inches to support ecological objectives. The total project is part of a broader nutrient reduction strategy, with construction to be completed by June 1, 2025, and final seeding by June 30, 2025.

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File	Type	Posted
0-Bre911312B_NOTICE TO BIDDERS AA.pdf	PDF	Jul 8, 2024
1-Bre911312B_General Requirement.pdf	PDF	Jul 8, 2024
3-BRE911312B_Final Plans 03-06-2024.pdf	PDF	Jul 8, 2024
1245206-event.pdf	PDF	Jul 8, 2024
5-BRE911312B APPENDIX I Construction Admin Forms.pdf	PDF	Jul 8, 2024
2-BRE911312B_Final Specs 02-02-2024_REVISED07-05-2024.pdf	PDF	Jul 8, 2024
BRE911312B_Addendum_1_Pre-BidMin_SignIn_PlanHolders_.pdf	PDF	Jul 8, 2024
4-Bre911312B_Submittals.pdf	PDF	Jul 8, 2024
Notice to Bidders.html	HTML file	Jul 8, 2024
Construction Specifications.html	HTML file	Jul 8, 2024
Construction Plans.html	HTML file	Jul 8, 2024

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STORM WATER CALCULATIONS

For:

TESINGER WETLAND

BRE911312B

Iowa Department of Agriculture and Land Stewardship

Denver, Iowa

S-H PROJECT # 4216000

January 22, 2024

I hereby certify that the portion of this engineering document was prepared by me or under my direct personal supervision. I am a duly licensed Professional Engineer under the laws of the State of Iowa.

Signature: ____________________________________________

Name: Dan Jensen, P.E. .

Date: _________________________

My license renewal date is December 31, 2025.

Pages, sheets, or divisions covered by this certification: ________

_Stormwater Report and Attachments __________________

Prepared by:

4125 Westown Parkway, Suite 100 – West Des Moines, Iowa 50266

(515) 223-8104

01/23/2024

TABLE OF CONTENTS

1. Project Summary

2. Drainage Area Map

3. Soil Map/Land Characteristics

4. Principal Spillway Calculations

5. Geotechnical Report

6. Specifications

PROJECT SUMMARY

GENERAL

The proposed work includes construction of a wetland to the southeast of Waverly, IA. The location can be more specifically described as the NW ¼ of Section 12, Township 91 North, Range 13 West of the Fifth Principal meridian, Bremer County, Iowa. A dam will be constructed to impound water for the wetland. A drawdown structure on the dam will allow for pool elevation control.

DESIGN STANDARDS, ANALYSIS, AND ASSUMPTIONS

The design procedures and guidelines were obtained from the following resources:

1. “National Engineering Handbook 4 – Hydrology”

2. “NRCS Practice Standard 656, 378, 410” (as applicable)

DESIGN CRITERIA AND GUIDELINES

WATER CONTROL STRUCTURE

The water control structure is a 48” circular CMP riser equipped with stop logs for water elevation control. A 12’’ CMP will enter the structure from the pool area. A 12” Dual Wall HDPE discharge pipe will run south and daylight into the existing stream.

PRINCIPAL SPILLWAY

The principal spillway consists of a 20’ wide steel sheet pile structure in the embankment at an elevation of 956.00’. Since the structure is low hazard with a drainage area smaller than 250 acres (23.9 acres Overland), the principal spillway must pass the 5-year, 24-hour storm according to NRCS 656. NRCS 656 references both NRCS 378 and 410. The most conservative of the two standards were used for design, NRCS 378. This equates to a 25-year, 24-hour storm producing a rainfall depth of 5.60”. The storm will produce a discharge of 81 cfs through the principal spillway and a peak water surface elevation of 956.50’.

FREEBOARD DESIGN

Based on NRCS 378, the freeboard design storm shall be the 100-year, 24-hour storm and the design shall maintain a minimum 1-foot freeboard from wetland pool elevation to top of dam. This equates to a storm producing a rainfall depth of 7.50”. The 100-year, 24-hour storm will produce a discharge of 116 cfs through the principal spillway and a peak water surface elevation of 956.65’. The top of dam elevation is set at 958.25’.

WATER QUALITY IMPROVEMENT

The wetland drawdown was designed to meet NRCS 656 requirements. Wetland will drawdown and return to design operating levels within 48 hours after a 10-year, 24-hour storm. The 10-year, 24-hour storm produced a 24 hour drawdown frequency. To promote emergent vegetation, 50% of the pool area (90% for this design) shall have depths from 0-24 inches.

TILE CAPACITY

The main source of hydrology for the wetland is through the tile diversion. An existing 12-inch concrete (manning n = 0.0108) main with a slope of approximately 0.41% will be diverted as shown on the plans.

The proposed tile will be an 18-inch Dual Wall HDPE (manning n = 0.012) pipe with a slope of 0.11%.

The tile capacities were calculated using Bently Flowmaster™ to be 2.75 CFS (Existing 12” Concrete Tile) and 3.77 CFS (Proposed 18” HDPE Tile). In addition, the full flow velocity of the proposed HDPE tile is approximately 1.9 ft/s. The Iowa Drainage Guide states a minimum cleanout velocity for sand and silt to be 1.4 ft/s.

SLOPE DESIGN

Side slopes were designed to meet NRCS 656 requirements which reference NRCS 378. Slopes designed with a ratio if three horizontal to one vertical (3:1) or flatter.

EMBANKMENT DESIGN

Per NRCS 378, top width required for dams with total heights less than 15 feet require a minimum of 10 feet top width. A 12-foot top width was chosen for this design. Minimum settlement of 5% of the total height of the dam was accounted for on the final construction elevation of the dam. This equates to a final construction elevation of 958.50’ ([5 feet x 0.05] + 958.25).

IMPOUNDMENT LIFE

The Impoundment life was calculated using estimated sediment delivery and NRCS standard total erosion rate estimates. The erosion rates are based on the Average Annual Soil Erosion by Water on Cropland and CRP Land, 1982, published by USDA and revised in December 2000. This indicated that the erosion rates for the area ranged from 3 to 5 tons per acre per year. Furthermore, sediment delivery was based on NRCS FOTG “Erosion & Sediment Delivery”, (Chart I: Estimated sediment delivery for landform regions). The chart indicated a sediment delivery percentage of approximately 35% for a 23.9-acre drainage area located in the Iowan Surface Landform. Finally, the estimated sediment storage is based on the normal pool storage volume of 11.8 ac-ft.

Based on the assumed soil erosion rate (5 T/Ac/yr), delivery ratio (35%), a sediment unit weight of 100 PCF, and sediment capture rate of 100% of delivered sediment, approximately 41.8 tons of sediment per year (837 CF) is anticipated to be retained in the wetland. With a total sediment capacity of 11.8 ac-ft, this equates to an expected impoundment life of 614 years.

GEOTECHNICAL INVESTIGATION AND EVALUATION

Limited soil test pits were completed by Shive-Hattery on November 3, 2021. Pits consisted of open excavations with a backhoe extending to a depth of approximately 6 feet.

Soils consist of a surface layer of dark organic topsoil followed by a clay layer. The clay layer was observed down to depths of about 3 feet. Below the clay, a porous sand layer was observed.

Excavation within the pool shall not extend into the sand layer and a minimum of 1 foot of scarified and recompacted clay shall remain on the entire excavation footprint. Excavation depths shall not exceed 2 feet below ground within the pool except in small locations as shown on the plans.

U S

H W

230TH ST

R D

DRAINAGE AREA

AREA = 23.9 ACRES

NORMAL POOL

AREA = 8.0 ACRES

NOTE:

ADDITIONAL 409 ACRES OF

DRAINAGE FROM TILE DIVERSION

A B C D E F

N P

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T D

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A B C D E F

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NORTH

Hydrologic Soil Group—Bremer County, Iowa

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

10/18/2023

554300 554400 554500 554600 554700 554800 554900 555000 555100 555200 555300 555400 555500

42° 42' 57'' N

5' ' W

42° 42' 57'' N

6' ' W

42° 42' 29'' N

5' ' W

42° 42' 29'' N

6' ' W

Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 15N WGS84 0 250 500 1000 1500

Feet 0 50 100 200 300

Meters Map Scale: 1:6,090 if printed on A landscape (11" x 8.5") sheet.

Soil Map may not be valid at this scale.

MAP LEGEND MAP INFORMATION

Area of Interest (AOI) Area of Interest (AOI)

Soils Soil Rating Polygons

A/D

B/D

C/D

Not rated or not available

Soil Rating Lines A

A/D

B/D

C/D

Not rated or not available

Soil Rating Points A

A/D

B/D

C/D

Not rated or not available

Water Features Streams and Canals

Transportation Rails

Interstate Highways

US Routes

Major Roads

Local Roads

Background Aerial Photography

The soil surveys that comprise your AOI were mapped at 1:12,000.

Warning: Soil Map may not be valid at this scale.

Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale.

Please rely on the bar scale on each map sheet for map measurements.

Source of Map: Natural Resources Conservation Service Web Soil Survey URL:

Coordinate System: Web Mercator (EPSG:3857)

Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required.

This product is generated from the USDA-NRCS certified data as of the version date(s) listed below.

Soil Survey Area: Bremer County, Iowa Survey Area Data: Version 28, Sep 12, 2023

Soil map units are labeled (as space allows) for map scales 1:50,000 or larger.

Date(s) aerial images were photographed: Nov 21, 2021—Nov 24, 2021

The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident.

Hydrologic Soil Group—Bremer County, Iowa

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

10/18/2023

Hydrologic Soil Group

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

83B Kenyon loam, 2 to 5 percent slopes

C 3.8 2.2%

83C Kenyon loam, 5 to 9 percent slopes

C 5.5 3.2%

84 Clyde silty clay loam, 0 to 3 percent slopes

C/D 23.4 13.5%

178 Waukee loam, 0 to 2 percent slopes, rarely flooded

B 3.5 2.0%

178B Waukee loam, 2 to 5 percent slopes, rarely flooded

B 3.4 1.9%

198B Floyd loam, 1 to 4 percent slopes

B/D 45.3 26.1%

395B Marquis loam, 2 to 5 percent slopes

C 8.0 4.6%

585 Coland-Spillville complex, 0 to 2 percent slopes, occasionally flooded

C/D 16.8 9.7%

1226 Lawler loam, 0 to 2 percent slopes, rarely flooded

B/D 8.1 4.7%

1585 Spillville-Coland- Shandep complex, 0 to 2 percent slopes, frequently flooded

C/D 37.7 21.7%

4946 Udorthents-Interstate highway complex, 0 to 5 percent slopes

7.6 4.4%

5040 Anthroportic Udorthents, 2 to 9 percent slopes

C 10.1 5.9%

Totals for Area of Interest 173.2 100.0%

Hydrologic Soil Group—Bremer County, Iowa

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

Description

Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long-duration storms.

The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows:

Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission.

Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture.

These soils have a moderate rate of water transmission.

Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission.

Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink-swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission.

If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes.

Rating Options

Aggregation Method: Dominant Condition

Component Percent Cutoff: None Specified

Tie-break Rule: Higher

Hydrologic Soil Group—Bremer County, Iowa

Natural Resources Conservation Service

Web Soil Survey National Cooperative Soil Survey

97Outlet Input Data, 100 years (Post-Development 100 year)

95Outlet Input Data, 25 years (Post-Development 25 year)

93Outlet Input Data, 5 years (Post-Development 5 year)

Sheet Pile

92Elevation-Area Volume Curve, 100 years (Post-Development 100 year)

91Elevation-Area Volume Curve, 25 years (Post-Development 25 year)

90Volume Equations, 5 years (Post-Development 5 year)

89Elevation-Area Volume Curve, 5 years (Post-Development 5 year)

WetlandPool

80Time vs. Volume, 100 years (Post-Development 100 year)

71Time vs. Volume, 25 years (Post-Development 25 year)

62Time vs. Volume, 5 years (Post-Development 5 year)

WetlandPool

53Time vs. Elevation, 100 years (Post-Development 100 year)

44Time vs. Elevation, 25 years (Post-Development 25 year)

35Time vs. Elevation, 5 years (Post-Development 5 year)

WetlandPool (OUT)

34Addition Summary, 100 years (Post-Development 100 year)

33Addition Summary, 25 years (Post-Development 25 year)

32Addition Summary, 5 years (Post-Development 5 year)

Wetland Outlet

30Unit Hydrograph (Hydrograph Table), 100 years (Post- Development 100 year)

28Unit Hydrograph Summary, 100 years (Post-Development 100 year)

26Unit Hydrograph (Hydrograph Table), 25 years (Post- Development 25 year)

24Unit Hydrograph Summary, 25 years (Post-Development 25 year)

22Unit Hydrograph (Hydrograph Table), 5 years (Post- Development 5 year)

20Unit Hydrograph Summary, 5 years (Post-Development 5 year)

OverlandFlow

18Read Hydrograph, 100 years (Post-Development 100 year)

16Read Hydrograph, 25 years (Post-Development 25 year)

14Read Hydrograph, 5 years (Post-Development 5 year)

18" Tile Diversion

12Time of Concentration Calculations, 100 years (Post- Development 100 year)

10Time of Concentration Calculations, 25 years (Post- Development 25 year)

8Time of Concentration Calculations, 5 years (Post- Development 5 year)

OverlandFlow

6Time-Depth Curve, 5 years (Post-Development 5 year)

4Time-Depth Curve, 25 years (Post-Development 25 year)

2Time-Depth Curve, 100 years (Post-Development 100 year)

MSE4

1Master Network Summary

Table of Contents

97Outlet Input Data, 100 years (Post-Development 100 year)

95Outlet Input Data, 25 years (Post-Development 25 year)

93Outlet Input Data, 5 years (Post-Development 5 year)

Sheet Pile

92Elevation-Area Volume Curve, 100 years (Post-Development 100 year)

91Elevation-Area Volume Curve, 25 years (Post-Development 25 year)

90Volume Equations, 5 years (Post-Development 5 year)

89Elevation-Area Volume Curve, 5 years (Post-Development 5 year)

WetlandPool

80Time vs. Volume, 100 years (Post-Development 100 year)

71Time vs. Volume, 25 years (Post-Development 25 year)

62Time vs. Volume, 5 years (Post-Development 5 year)

WetlandPool

53Time vs. Elevation, 100 years (Post-Development 100 year)

44Time vs. Elevation, 25 years (Post-Development 25 year)

35Time vs. Elevation, 5 years (Post-Development 5 year)

WetlandPool (OUT)

34Addition Summary, 100 years (Post-Development 100 year)

33Addition Summary, 25 years (Post-Development 25 year)

32Addition Summary, 5 years (Post-Development 5 year)

Wetland Outlet

30Unit Hydrograph (Hydrograph Table), 100 years (Post- Development 100 year)

28Unit Hydrograph Summary, 100 years (Post-Development 100 year)

26Unit Hydrograph (Hydrograph Table), 25 years (Post- Development 25 year)

24Unit Hydrograph Summary, 25 years (Post-Development 25 year)

22Unit Hydrograph (Hydrograph Table), 5 years (Post- Development 5 year)

20Unit Hydrograph Summary, 5 years (Post-Development 5 year)

OverlandFlow

18Read Hydrograph, 100 years (Post-Development 100 year)

16Read Hydrograph, 25 years (Post-Development 25 year)

14Read Hydrograph, 5 years (Post-Development 5 year)

18" Tile Diversion

12Time of Concentration Calculations, 100 years (Post- Development 100 year)

10Time of Concentration Calculations, 25 years (Post- Development 25 year)

8Time of Concentration Calculations, 5 years (Post- Development 5 year)

OverlandFlow

6Time-Depth Curve, 5 years (Post-Development 5 year)

4Time-Depth Curve, 25 years (Post-Development 25 year)

2Time-Depth Curve, 100 years (Post-Development 100 year)

MSE4

1Master Network Summary

Scenario: Post-Development 25 year

18" Tile Diversion

OverlandFlow

WetlandPool

W etla nd O utle t

Wetland Outlet

WetlandOutlet

Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-16661/19/2024

PondPack CONNECT Edition [10.02.00.01]Bentley Systems, Inc. Haestad Methods Solution CenterBRE911312B - Section 3 - MSE4.ppc

18" Tile Diversion

OverlandFlow

WetlandPool

W etla nd O utle t

Wetland Outlet

WetlandOutlet

OverlandFlow

18" Tile Diversion

Wetland Outlet

WetlandPool

Sheet Pile

BRE911312B WETLAND

Subsection: Master Network Summary

Catchments Summary Peak Flow

(ft³/s) Time to Peak

(hours) Hydrograph

Volume (ac-ft)

Return Event

(years)

ScenarioLabel

45.1812.3004.5065Post-Development 5 year

OverlandFlow

77.0612.3007.74625Post-Development 25 year

OverlandFlow

111.7112.30011.378100Post-Development 100 year

OverlandFlow

3.800.00015.0745Post-Development 5 year

18" Tile Diversion

3.800.00015.07425Post-Development 25 year

18" Tile Diversion

3.800.00015.074100Post-Development 100 year

18" Tile Diversion

Node Summary Peak Flow

(ft³/s) Time to Peak

(hours) Hydrograph

Volume (ac-ft)

Return Event

(years)

ScenarioLabel

13.6413.10019.5885Post-Development 5 year

Wetland Outlet

23.8412.95022.82825Post-Development 25 year

Wetland Outlet

36.1712.90026.460100Post-Development 100 year

Wetland Outlet

Pond Summary Maximum

Pond Storage (ac-ft)

Maximum Water

Surface Elevation

(ft)

Peak Flow (ft³/s)

Time to Peak (hours)

Hydrograph Volume (ac-ft)

Return Event

(years)

ScenarioLabel

(N/A)(N/A)48.9812.30019.5885Post- Development 5 year

WetlandPool

(IN)

14.715956.3413.6413.10019.5885Post- Development 5 year

WetlandPool

(OUT)

(N/A)(N/A)80.8612.30022.82825Post- Development 25 year

WetlandPool

(IN)

16.164956.5023.8412.95022.82825Post- Development 25 year

WetlandPool

(OUT)

(N/A)(N/A)115.5112.30026.460100Post- Development 100 year

WetlandPool

(IN)

17.681956.6536.1712.90026.460100Post- Development 100 year

WetlandPool

(OUT)

Page 1 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Bentley Systems, Inc. Haestad Methods Solution CenterBRE911312B - Section 3 - MSE4.ppc

Scenario: Post-Development 100 year Storm Event: 100 yearLabel: MSE4

Return Event: 100 yearsSubsection: Time-Depth Curve

Time-Depth Curve: 100 year

100 yearLabel hours0.000Start Time hours0.100Increment hours24.000End Time years100Return Event

CUMULATIVE RAINFALL (in) Output Time Increment = 0.100 hours

Time on left represents time for first value in each row.

Depth (in)

Time (hours)

0.00.00.00.00.00.000 0.00.00.00.00.00.500 0.10.10.00.00.01.000 0.10.10.10.10.11.500 0.10.10.10.10.12.000 0.20.10.10.10.12.500 0.20.20.20.20.23.000 0.20.20.20.20.23.500 0.30.30.30.30.24.000 0.30.30.30.30.34.500 0.40.40.40.40.35.000 0.40.40.40.40.45.500 0.50.50.50.50.56.000 0.60.60.60.50.56.500 0.60.60.60.60.67.000 0.70.70.70.70.77.500 0.80.80.80.80.78.000 0.90.90.90.80.88.500 1.01.01.00.90.99.000 1.21.11.11.11.09.500 1.31.31.21.21.210.000 1.61.51.41.41.310.500 1.91.81.81.71.611.000 2.92.62.32.22.011.500 5.35.14.94.63.512.000 5.85.75.65.55.412.500 6.16.06.05.95.913.000 6.36.26.26.26.113.500 6.46.46.46.36.314.000 6.56.56.56.56.414.500 6.66.66.66.66.615.000 6.76.76.76.76.715.500 6.86.86.86.86.716.000 6.96.96.86.86.816.500 6.96.96.96.96.917.000 7.07.07.07.07.017.500 7.17.17.07.07.018.000 7.17.17.17.17.118.500

Page 2 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: MSE4

Return Event: 100 yearsSubsection: Time-Depth Curve

CUMULATIVE RAINFALL (in) Output Time Increment = 0.100 hours

Time on left represents time for first value in each row.

Depth (in)

Time (hours)

7.27.27.27.17.119.000 7.27.27.27.27.219.500 7.37.37.37.27.220.000 7.37.37.37.37.320.500 7.47.37.37.37.321.000 7.47.47.47.47.421.500 7.47.47.47.47.422.000 7.47.47.47.47.422.500 7.57.57.57.47.423.000 7.57.57.57.57.523.500

(N/A)(N/A)(N/A)(N/A)7.524.000

Page 3 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: MSE4

Return Event: 25 yearsSubsection: Time-Depth Curve

Time-Depth Curve: 25 year

25 yearLabel hours0.000Start Time hours0.100Increment hours24.000End Time years25Return Event

CUMULATIVE RAINFALL (in) Output Time Increment = 0.100 hours

Time on left represents time for first value in each row.

Depth (in)

Time (hours)

0.00.00.00.00.00.000 0.00.00.00.00.00.500 0.00.00.00.00.01.000 0.10.10.10.00.01.500 0.10.10.10.10.12.000 0.10.10.10.10.12.500 0.10.10.10.10.13.000 0.20.20.20.20.13.500 0.20.20.20.20.24.000 0.20.20.20.20.24.500 0.30.30.30.30.35.000 0.30.30.30.30.35.500 0.40.40.40.40.36.000 0.40.40.40.40.46.500 0.50.50.50.50.47.000 0.50.50.50.50.57.500 0.60.60.60.60.68.000 0.70.60.60.60.68.500 0.80.70.70.70.79.000 0.90.80.80.80.89.500 1.00.90.90.90.910.000 1.21.11.11.01.010.500 1.41.41.31.31.211.000 2.21.91.71.61.511.500 4.03.83.73.42.612.000 4.34.24.24.14.112.500 4.54.54.54.44.413.000 4.74.64.64.64.613.500 4.84.74.74.74.714.000 4.94.84.84.84.814.500 4.94.94.94.94.915.000 5.05.05.05.04.915.500 5.15.05.05.05.016.000 5.15.15.15.15.116.500 5.25.25.15.15.117.000 5.25.25.25.25.217.500 5.35.25.25.25.218.000 5.35.35.35.35.318.500

Page 4 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: MSE4

Return Event: 25 yearsSubsection: Time-Depth Curve

CUMULATIVE RAINFALL (in) Output Time Increment = 0.100 hours

Time on left represents time for first value in each row.

Depth (in)

Time (hours)

5.35.35.35.35.319.000 5.45.45.45.45.319.500 5.45.45.45.45.420.000 5.45.45.45.45.420.500 5.55.55.55.45.421.000 5.55.55.55.55.521.500 5.55.55.55.55.522.000 5.55.55.55.55.522.500 5.55.55.55.55.523.000 5.65.65.65.65.523.500

(N/A)(N/A)(N/A)(N/A)5.624.000

Page 5 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Scenario: Post-Development 5 year Storm Event: 5 yearLabel: MSE4

Return Event: 5 yearsSubsection: Time-Depth Curve

Time-Depth Curve: 5 year

5 yearLabel hours0.000Start Time hours0.100Increment hours24.000End Time years5Return Event

CUMULATIVE RAINFALL (in) Output Time Increment = 0.100 hours

Time on left represents time for first value in each row.

Depth (in)

Time (hours)

0.00.00.00.00.00.000 0.00.00.00.00.00.500 0.00.00.00.00.01.000 0.00.00.00.00.01.500 0.10.10.10.00.02.000 0.10.10.10.10.12.500 0.10.10.10.10.13.000 0.10.10.10.10.13.500 0.10.10.10.10.14.000 0.20.20.20.20.14.500 0.20.20.20.20.25.000 0.20.20.20.20.25.500 0.30.30.20.20.26.000 0.30.30.30.30.36.500 0.30.30.30.30.37.000 0.40.40.40.30.37.500 0.40.40.40.40.48.000 0.40.40.40.40.48.500 0.50.50.50.50.59.000 0.60.60.60.50.59.500 0.70.60.60.60.610.000 0.80.80.70.70.710.500 1.00.90.90.90.811.000 1.51.31.21.11.011.500 2.72.62.52.31.812.000 2.92.92.82.82.812.500 3.13.13.03.03.013.000 3.23.23.13.13.113.500 3.23.23.23.23.214.000 3.33.33.33.33.314.500 3.43.33.33.33.315.000 3.43.43.43.43.415.500 3.43.43.43.43.416.000 3.53.53.53.53.416.500 3.53.53.53.53.517.000 3.53.53.53.53.517.500 3.63.63.63.63.518.000 3.63.63.63.63.618.500

Page 6 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: MSE4

Return Event: 5 yearsSubsection: Time-Depth Curve

CUMULATIVE RAINFALL (in) Output Time Increment = 0.100 hours

Time on left represents time for first value in each row.

Depth (in)

Time (hours)

3.63.63.63.63.619.000 3.73.63.63.63.619.500 3.73.73.73.73.720.000 3.73.73.73.73.720.500 3.73.73.73.73.721.000 3.73.73.73.73.721.500 3.73.73.73.73.722.000 3.83.83.83.83.722.500 3.83.83.83.83.823.000 3.83.83.83.83.823.500

(N/A)(N/A)(N/A)(N/A)3.824.000

Page 7 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: OverlandFlow

Return Event: 5 yearsSubsection: Time of Concentration Calculations

Time of Concentration Results Segment #1: SCS Lag ft1,800.00Hydraulic Length

85.000CN

ft/ft0.025Slope ft/s1.09Average Velocity hours0.459Segment Time of Concentration

Time of Concentration (Composite) hours0.459Time of Concentration (Composite)

Page 8 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: OverlandFlow

Return Event: 5 yearsSubsection: Time of Concentration Calculations

==== SCS Lag

0.000877 * (Lf**0.8) * ((1000/CN)-9)**0.7) * (Sf**-0.5)Tc = Tc= Time of concentration, hours Lf= Flow length, feet CN= SCS Curve Number Sf= Slope, ft/ft

Where:

Page 9 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: OverlandFlow

Return Event: 25 yearsSubsection: Time of Concentration Calculations

Time of Concentration Results Segment #1: SCS Lag ft1,800.00Hydraulic Length

85.000CN

ft/ft0.025Slope ft/s1.09Average Velocity hours0.459Segment Time of Concentration

Time of Concentration (Composite) hours0.459Time of Concentration (Composite)

Page 10 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: OverlandFlow

Return Event: 25 yearsSubsection: Time of Concentration Calculations

==== SCS Lag

0.000877 * (Lf**0.8) * ((1000/CN)-9)**0.7) * (Sf**-0.5)Tc = Tc= Time of concentration, hours Lf= Flow length, feet CN= SCS Curve Number Sf= Slope, ft/ft

Where:

Page 11 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: OverlandFlow

Return Event: 100 yearsSubsection: Time of Concentration Calculations

Time of Concentration Results Segment #1: SCS Lag ft1,800.00Hydraulic Length

85.000CN

ft/ft0.025Slope ft/s1.09Average Velocity hours0.459Segment Time of Concentration

Time of Concentration (Composite) hours0.459Time of Concentration (Composite)

Page 12 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: OverlandFlow

Return Event: 100 yearsSubsection: Time of Concentration Calculations

==== SCS Lag

0.000877 * (Lf**0.8) * ((1000/CN)-9)**0.7) * (Sf**-0.5)Tc = Tc= Time of concentration, hours Lf= Flow length, feet CN= SCS Curve Number Sf= Slope, ft/ft

Where:

Page 13 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: 18" Tile Diversion

Return Event: 5 yearsSubsection: Read Hydrograph ft³/s3.80Peak Discharge hours15.800Time to Peak ac-ft15.074Hydrograph Volume

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.200 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 3.803.803.803.803.800.000 3.803.803.803.803.801.000 3.803.803.803.803.802.000 3.803.803.803.803.803.000 3.803.803.803.803.804.000 3.803.803.803.803.805.000 3.803.803.803.803.806.000 3.803.803.803.803.807.000 3.803.803.803.803.808.000 3.803.803.803.803.809.000 3.803.803.803.803.8010.000 3.803.803.803.803.8011.000 3.803.803.803.803.8012.000 3.803.803.803.803.8013.000 3.803.803.803.803.8014.000 3.803.803.803.803.8015.000 3.803.803.803.803.8016.000 3.803.803.803.803.8017.000 3.803.803.803.803.8018.000 3.803.803.803.803.8019.000 3.803.803.803.803.8020.000 3.803.803.803.803.8021.000 3.803.803.803.803.8022.000 3.803.803.803.803.8023.000 3.803.803.803.803.8024.000 3.803.803.803.803.8025.000 3.803.803.803.803.8026.000 3.803.803.803.803.8027.000 3.803.803.803.803.8028.000 3.803.803.803.803.8029.000 3.803.803.803.803.8030.000 3.803.803.803.803.8031.000 3.803.803.803.803.8032.000 3.803.803.803.803.8033.000 3.803.803.803.803.8034.000 3.803.803.803.803.8035.000 3.803.803.803.803.8036.000 3.803.803.803.803.8037.000 3.803.803.803.803.8038.000 3.803.803.803.803.8039.000 3.803.803.803.803.8040.000

Page 14 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: 18" Tile Diversion

Return Event: 5 yearsSubsection: Read Hydrograph

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.200 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 3.803.803.803.803.8041.000 3.803.803.803.803.8042.000 3.803.803.803.803.8043.000 3.803.803.803.803.8044.000 3.803.803.803.803.8045.000 3.803.803.803.803.8046.000 3.803.803.803.803.8047.000

(N/A)(N/A)(N/A)(N/A)3.8048.000

Page 15 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: 18" Tile Diversion

Return Event: 25 yearsSubsection: Read Hydrograph ft³/s3.80Peak Discharge hours15.800Time to Peak ac-ft15.074Hydrograph Volume

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.200 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

Page 16 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: 18" Tile Diversion

Return Event: 25 yearsSubsection: Read Hydrograph

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.200 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 3.803.803.803.803.8041.000 3.803.803.803.803.8042.000 3.803.803.803.803.8043.000 3.803.803.803.803.8044.000 3.803.803.803.803.8045.000 3.803.803.803.803.8046.000 3.803.803.803.803.8047.000

(N/A)(N/A)(N/A)(N/A)3.8048.000

Page 17 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: 18" Tile Diversion

Return Event: 100 yearsSubsection: Read Hydrograph ft³/s3.80Peak Discharge hours15.800Time to Peak ac-ft15.074Hydrograph Volume

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.200 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

Page 18 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: 18" Tile Diversion

Return Event: 100 yearsSubsection: Read Hydrograph

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.200 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 3.803.803.803.803.8041.000 3.803.803.803.803.8042.000 3.803.803.803.803.8043.000 3.803.803.803.803.8044.000 3.803.803.803.803.8045.000 3.803.803.803.803.8046.000 3.803.803.803.803.8047.000

(N/A)(N/A)(N/A)(N/A)3.8048.000

Page 19 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: OverlandFlow

Return Event: 5 yearsSubsection: Unit Hydrograph Summary

5 yearStorm Event years5Return Event hours96.000Duration in3.8Depth hours0.459Time of Concentration (Composite) acres23.9Area (User Defined) hours0.061Computational Time Increment hours12.301Time to Peak (Computed) ft³/s45.21Flow (Peak, Computed) hours0.050Output Increment hours12.300Time to Flow (Peak Interpolated Output) ft³/s45.18Flow (Peak Interpolated Output)

Drainage Area

85.000SCS CN (Composite) acres23.9Area (User Defined) in1.8Maximum Retention (Pervious) in0.4Maximum Retention (Pervious, 20 percent)

Cumulative Runoff in2.3Cumulative Runoff Depth (Pervious) ac-ft4.506Runoff Volume (Pervious)

Hydrograph Volume (Area under Hydrograph curve) ac-ft4.506Volume

SCS Unit Hydrograph Parameters hours0.459Time of Concentration (Composite) hours0.061Computational Time Increment

483.432Unit Hydrograph Shape Factor

0.749K Factor 1.670Receding/Rising, Tr/Tp ft³/s59.00Unit peak, qp hours0.306Unit peak time, Tp hours1.224Unit receding limb, Tr hours1.530Total unit time, Tb

Page 20 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: OverlandFlow

Return Event: 5 yearsSubsection: Unit Hydrograph Summary

SCS Unit Hydrograph Parameters

Page 21 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: OverlandFlow

Return Event: 5 yearsSubsection: Unit Hydrograph (Hydrograph Table)

5 yearStorm Event years5Return Event hours96.000Duration in3.8Depth hours0.459Time of Concentration (Composite) acres23.9Area (User Defined)

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.050 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 0.010.010.000.000.007.850 0.040.030.030.020.018.100 0.080.070.060.050.058.350 0.120.110.100.100.098.600 0.170.160.150.140.138.850 0.280.250.220.200.189.100 0.420.390.370.340.319.350 0.550.520.500.470.459.600 0.670.650.620.600.579.850 0.800.770.750.720.7010.100 0.940.900.880.850.8210.350 1.341.221.121.040.9810.600 2.071.911.751.611.4710.850 2.952.762.582.402.2311.100 4.053.803.573.363.1511.350 6.835.925.264.754.3611.600

18.1014.1611.519.518.0011.850 45.1842.0036.5330.0323.5912.100 31.5835.8939.9843.2445.1212.350 16.7718.9721.5324.4627.7512.600 10.5011.3212.3013.5014.9512.850 7.888.288.739.249.8113.100 6.156.476.807.147.5013.350 4.494.815.155.495.8213.600 3.513.633.783.974.2113.850 3.193.233.283.343.4214.100 3.043.073.093.123.1514.350 2.942.962.983.003.0214.600 2.842.872.892.902.9214.850 2.372.492.622.722.7915.100 1.931.982.052.142.2515.350 1.781.801.821.851.8915.600 1.711.721.731.751.7615.850 1.661.671.681.691.7016.100 1.621.631.641.641.6516.350 1.581.591.601.601.6116.600 1.541.551.561.561.5716.850

Page 22 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: OverlandFlow

Return Event: 5 yearsSubsection: Unit Hydrograph (Hydrograph Table)

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.050 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 1.501.511.521.521.5317.100 1.461.471.471.481.4917.350 1.421.431.431.441.4517.600 1.381.381.391.401.4117.850 1.331.341.351.361.3718.100 1.291.301.311.321.3318.350 1.251.261.271.281.2918.600 1.211.221.231.241.2418.850 1.171.181.191.191.2019.100 1.131.141.141.151.1619.350 1.091.091.101.111.1219.600 1.041.051.061.071.0819.850 1.001.011.021.031.0420.100 0.960.970.980.990.9920.350 0.920.930.930.940.9520.600 0.880.880.890.900.9120.850 0.830.840.850.860.8721.100 0.790.800.810.820.8221.350 0.750.760.770.770.7821.600 0.710.710.720.730.7421.850 0.660.670.680.690.7022.100 0.620.630.640.650.6522.350 0.580.590.600.600.6122.600 0.530.540.550.560.5722.850 0.490.500.510.520.5323.100 0.450.460.470.480.4823.350 0.410.410.420.430.4423.600 0.360.370.380.390.4023.850 0.190.240.280.310.3424.100 0.050.070.090.120.1524.350 0.010.020.020.030.0424.600 0.000.000.010.010.0124.850

(N/A)0.000.000.000.0025.100

Page 23 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: OverlandFlow

Return Event: 25 yearsSubsection: Unit Hydrograph Summary

25 yearStorm Event years25Return Event hours96.000Duration in5.6Depth hours0.459Time of Concentration (Composite) acres23.9Area (User Defined) hours0.061Computational Time Increment hours12.301Time to Peak (Computed) ft³/s77.11Flow (Peak, Computed) hours0.050Output Increment hours12.300Time to Flow (Peak Interpolated Output) ft³/s77.06Flow (Peak Interpolated Output)

Drainage Area

85.000SCS CN (Composite) acres23.9Area (User Defined) in1.8Maximum Retention (Pervious) in0.4Maximum Retention (Pervious, 20 percent)

Cumulative Runoff in3.9Cumulative Runoff Depth (Pervious) ac-ft7.746Runoff Volume (Pervious)

Hydrograph Volume (Area under Hydrograph curve) ac-ft7.746Volume

SCS Unit Hydrograph Parameters hours0.459Time of Concentration (Composite) hours0.061Computational Time Increment

483.432Unit Hydrograph Shape Factor

0.749K Factor 1.670Receding/Rising, Tr/Tp ft³/s59.00Unit peak, qp hours0.306Unit peak time, Tp hours1.224Unit receding limb, Tr hours1.530Total unit time, Tb

Page 24 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: OverlandFlow

Return Event: 25 yearsSubsection: Unit Hydrograph Summary

SCS Unit Hydrograph Parameters

Page 25 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: OverlandFlow

Return Event: 25 yearsSubsection: Unit Hydrograph (Hydrograph Table)

25 yearStorm Event years25Return Event hours96.000Duration in5.6Depth hours0.459Time of Concentration (Composite) acres23.9Area (User Defined)

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.050 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 0.010.010.010.000.006.250 0.060.050.040.030.026.500 0.120.110.100.080.076.750 0.190.170.160.150.137.000 0.260.240.230.210.207.250 0.330.320.300.290.277.500 0.410.390.380.360.357.750 0.480.470.450.440.428.000 0.560.550.530.520.508.250 0.650.630.610.600.588.500 0.730.710.700.680.668.750 0.920.850.810.770.759.000 1.301.231.151.070.999.250 1.581.531.481.421.379.500 1.811.761.721.671.639.750 2.031.981.941.901.8510.000 2.252.202.162.112.0710.250 2.722.552.432.352.2910.500 4.053.753.463.182.9410.750 5.665.324.994.674.3611.000 7.487.106.736.366.0111.250

10.509.578.878.327.8811.500 21.6118.1215.4313.3411.7011.750 63.4952.8542.1832.9626.2212.000 67.0172.8576.4677.0672.2512.250 35.3940.3345.9252.4459.8712.500 19.9421.9324.3527.4031.0812.750 14.0114.8415.8016.9418.3013.000 10.8411.3911.9712.5913.2713.250 8.178.729.259.7810.3013.500 5.996.306.687.137.6313.750 5.195.295.425.575.7514.000 4.884.934.985.045.1114.250 4.704.734.774.804.8414.500 4.554.584.614.644.6714.750 4.124.284.404.484.5215.000 3.233.373.543.733.9315.250

Page 26 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: OverlandFlow

Return Event: 25 yearsSubsection: Unit Hydrograph (Hydrograph Table)

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.050 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 2.872.912.973.033.1215.500 2.722.742.772.802.8315.750 2.642.652.672.692.7016.000 2.572.582.602.612.6216.250 2.502.522.532.542.5616.500 2.442.452.472.482.4916.750 2.382.392.402.412.4317.000 2.312.322.342.352.3617.250 2.252.262.272.282.3017.500 2.182.192.212.222.2317.750 2.112.132.142.152.1718.000 2.052.062.082.092.1018.250 1.982.002.012.032.0418.500 1.921.931.941.961.9718.750 1.851.871.881.891.9119.000 1.791.801.811.831.8419.250 1.721.731.751.761.7719.500 1.661.671.681.701.7119.750 1.591.601.621.631.6420.000 1.521.541.551.561.5820.250 1.461.471.481.501.5120.500 1.391.411.421.431.4420.750 1.331.341.351.371.3821.000 1.261.271.291.301.3121.250 1.191.211.221.231.2521.500 1.131.141.151.171.1821.750 1.061.071.091.101.1122.000 0.991.011.021.031.0522.250 0.930.940.950.970.9822.500 0.860.870.890.900.9122.750 0.790.810.820.830.8523.000 0.730.740.750.770.7823.250 0.660.670.690.700.7123.500 0.590.610.620.630.6523.750 0.430.490.530.560.5824.000 0.140.190.240.300.3724.250 0.040.050.060.080.1124.500 0.010.010.020.020.0324.750 0.000.000.000.010.0125.000

(N/A)(N/A)(N/A)0.000.0025.250

Page 27 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: OverlandFlow

Return Event: 100 yearsSubsection: Unit Hydrograph Summary

100 yearStorm Event years100Return Event hours96.000Duration in7.5Depth hours0.459Time of Concentration (Composite) acres23.9Area (User Defined) hours0.061Computational Time Increment hours12.301Time to Peak (Computed) ft³/s111.78Flow (Peak, Computed) hours0.050Output Increment hours12.300Time to Flow (Peak Interpolated Output) ft³/s111.71Flow (Peak Interpolated Output)

Drainage Area

85.000SCS CN (Composite) acres23.9Area (User Defined) in1.8Maximum Retention (Pervious) in0.4Maximum Retention (Pervious, 20 percent)

Cumulative Runoff in5.7Cumulative Runoff Depth (Pervious) ac-ft11.378Runoff Volume (Pervious)

Hydrograph Volume (Area under Hydrograph curve) ac-ft11.378Volume

SCS Unit Hydrograph Parameters hours0.459Time of Concentration (Composite) hours0.061Computational Time Increment

483.432Unit Hydrograph Shape Factor

0.749K Factor 1.670Receding/Rising, Tr/Tp ft³/s59.00Unit peak, qp hours0.306Unit peak time, Tp hours1.224Unit receding limb, Tr hours1.530Total unit time, Tb

Page 28 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: OverlandFlow

Return Event: 100 yearsSubsection: Unit Hydrograph Summary

SCS Unit Hydrograph Parameters

Page 29 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: OverlandFlow

Return Event: 100 yearsSubsection: Unit Hydrograph (Hydrograph Table)

100 yearStorm Event years100Return Event hours96.000Duration in7.5Depth hours0.459Time of Concentration (Composite) acres23.9Area (User Defined)

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.050 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 0.020.010.010.000.005.200 0.080.060.050.040.035.450 0.160.140.120.110.095.700 0.250.230.210.200.185.950 0.350.330.310.290.276.200 0.450.430.410.390.376.450 0.560.540.510.490.476.700 0.670.640.620.600.586.950 0.780.760.730.710.697.200 0.890.870.850.820.807.450 1.010.990.960.940.927.700 1.131.111.081.061.047.950 1.251.231.201.181.168.200 1.381.351.331.301.288.450 1.511.481.461.431.408.700 1.741.651.591.561.538.950 2.422.282.131.991.859.200 2.922.842.752.652.549.450 3.273.213.143.073.009.700 3.593.533.473.403.349.950 3.903.843.783.713.6510.200 4.424.244.124.033.9610.450 6.365.895.455.054.7010.700 8.838.327.827.336.8410.950

11.5110.9510.419.879.3411.200 15.1614.1213.3112.6612.0811.450 27.8623.8820.7818.3416.5411.700 77.9362.7249.4839.7333.0011.950

104.90110.44111.71105.2092.9712.200 57.4065.4974.9385.7496.2112.450 30.9734.4338.8144.0950.2912.700 20.8222.1923.8225.7628.1112.950 15.9216.7517.6318.5919.6413.200 12.1712.9213.6514.3915.1413.450 8.789.319.9410.6411.4013.700 7.377.547.768.028.3413.950 6.866.947.027.127.2314.200

Page 30 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: OverlandFlow

Return Event: 100 yearsSubsection: Unit Hydrograph (Hydrograph Table)

HYDROGRAPH ORDINATES (ft³/s) Output Time Increment = 0.050 hours

Time on left represents time for first value in each row.

Flow

(ft³/s) Flow

(ft³/s) Time

(hours) 6.586.636.686.746.8014.450 6.376.416.456.496.5414.700 5.956.126.226.286.3314.950 4.684.925.185.465.7215.200 4.044.124.214.334.4915.450 3.813.843.883.933.9815.700 3.683.703.733.753.7815.950 3.583.603.623.643.6616.200 3.493.513.533.553.5616.450 3.403.423.443.463.4716.700 3.313.333.353.363.3816.950 3.223.243.263.283.2917.200 3.133.153.173.183.2017.450 3.043.063.083.093.1117.700 2.952.962.983.003.0217.950 2.862.872.892.912.9318.200 2.772.792.802.822.8418.450 2.672.692.712.732.7518.700 2.582.602.622.642.6618.950 2.492.512.532.552.5719.200 2.402.422.442.452.4719.450 2.312.332.352.362.3819.700 2.222.242.262.272.2919.950 2.132.142.162.182.2020.200 2.032.052.072.092.1120.450 1.941.961.982.002.0120.700 1.851.871.891.911.9220.950 1.761.781.801.811.8321.200 1.671.691.701.721.7421.450 1.571.591.611.631.6521.700 1.481.501.521.541.5621.950 1.391.411.431.441.4622.200 1.301.321.341.351.3722.450 1.211.231.241.261.2822.700 1.111.131.151.171.1922.950 1.021.041.061.081.0923.200 0.930.950.970.991.0023.450 0.840.860.870.890.9123.700 0.670.730.770.800.8223.950 0.260.330.420.510.6024.200 0.070.090.110.150.2024.450 0.020.020.030.040.0524.700 0.000.010.010.010.0124.950

(N/A)0.000.000.000.0025.200

Page 31 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: Wetland Outlet

Return Event: 5 yearsSubsection: Addition Summary

Summary for Hydrograph Addition at 'Wetland Outlet'

Upstream NodeUpstream Link WetlandPoolWetland Outlet

Node Inflows

Flow (Peak) (ft³/s)

Time to Peak (hours)

Volume (ac-ft)

ElementInflow Type

13.6413.10019.588Wetland OutletFlow (From) 13.6413.10019.588Wetland OutletFlow (In)

Page 32 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 25 yearLabel: Wetland Outlet

Return Event: 25 yearsSubsection: Addition Summary

Summary for Hydrograph Addition at 'Wetland Outlet'

Upstream NodeUpstream Link WetlandPoolWetland Outlet

Node Inflows

Flow (Peak) (ft³/s)

Time to Peak (hours)

Volume (ac-ft)

ElementInflow Type

23.8412.95022.828Wetland OutletFlow (From) 23.8412.95022.828Wetland OutletFlow (In)

Page 33 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 100 yearLabel: Wetland Outlet

Return Event: 100 yearsSubsection: Addition Summary

Summary for Hydrograph Addition at 'Wetland Outlet'

Upstream NodeUpstream Link WetlandPoolWetland Outlet

Node Inflows

Flow (Peak) (ft³/s)

Time to Peak (hours)

Volume (ac-ft)

ElementInflow Type

36.1712.90026.460Wetland OutletFlow (From) 36.1712.90026.460Wetland OutletFlow (In)

Page 34 of 10027 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666

1/22/2024

PondPack CONNECT Edition [10.02.00.01]

Storm Event: 5 yearLabel: WetlandPool (OUT)

Return Event: 5 yearsSubsection: Time vs. Elevation

Time vs. Elevation (ft)

Output Time increment = 0.050 hours Time on left represents time for first value in each row.

Elevation (ft)

Time (hours)

956.01956.01956.00956.00956.000.000 956.02956.01956.01956.01956.010.250 956.02956.02956.02956.02956.020.500 956.03956.03956.03956.03956.020.750 956.04956.03956.03956.03956.031.000 956.04956.04956.04956.04956.041.250 956.05956.04956.04956.04956.041.500 956.05956.05956.05956.05956.051.750 956.05956.05956.05956.05956.052.000 956.06956.06956.06956.06956.062.250 956.06956.06956.06956.06956.062.500 956.06956.06956.06956.06956.062.750 956.07956.07956.07956.07956.073.000 956.07956.07956.07956.07956.073.250 956.07956.07956.07956.07956.073.500…

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File details come from the government source that posted it. Updated May 20, 2025.