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Stormwater Narrative900 Route 146 Clifton Park, NY 12065 (P) 518.371.7621 (F) 518.371.9540 edpllp.com STORMWATER DESIGN REPORT Schermerhorn Residential Holdings 67 Haviland Road Queensbury, New York September, 2022 1. INTRODUCTION Schermerhorn Residential Holdings is proposing the construction of a driveway for a future single- family residence with associated features for the property located at 67 Haviland Road in the Town of Queensbury, New York. The existing site is approximately a 15.25-acre parcel containing a portion of an existing driveway, cultivated areas, and undeveloped land with surrounding NYSDEC jurisdictional wetland areas. The proposed project and land disturbances will be confined to a residential driveway that extends from an existing driveway on site to provide access for future proposed structures. NYSDEC has approved the small portions of the project that are within the NYSDEC jurisdictional wetland buffers (DEC ID 5-5234-00717). The proposed project also includes two shallow grassed depressions that will attenuate and infiltrate the runoff from sections of the proposed driveway area. The total disturbance for the site is on the order of 0.99 acres and therefore the site does not require coverage under a NYSDEC SPDES permit and does not require post construction stormwater designed in accordance with the NYSDEC Stormwater Management Design Manual. The project site is also located outside of the Lake George Park and therefore is not required to meet the stormwater management regulation of Section 147-11 of the Town of Queensbury Code. 2. EXISTING SITE CONDITIONS The existing site currently contains 1,600± SF of a residential driveway that continues off site to connect to an existing single-family house on an adjacent parcel. There are some cultivated areas, as well as undeveloped land with surrounding NYSDEC jurisdictional wetland areas. There are currently no stormwater management devices on site, with runoff flowing from west to east, ultimately discharging to NYSDEC wetland areas on site. Topography of the site is relatively flat with the majority of slopes ranging from 1% to 10%. The USDA Web Soil Survey specifies two soil types within the project site, Hudson silt loam and Oakville loamy fine sand. Hudson silt loam is a deep, predominantly moderately well drained loam, soil classified as hydrologic soil group “D”. Oakville loamy fine sand is a deep, predominantly well drained sand, soil classified as hydrologic soil group “A”. The USDA Web Soil Survey specifies a depth to water table ranging from 24” to more than 80”, and an approximate infiltration rate ranging from 0.20 to 20 in/hr. Based on the soils data and information provided a conservative infiltration rate of 1 inch/hour was used in the design of the two shallow grassed depression areas, and the bottom elevations will not be within the groundwater table to encourage infiltration. 2 900 Route 146 Clifton Park, NY 12065 (P) 518.371.7621 (F) 518.371.9540 edpllp.com Schermerhorn Residential Holdings Stormwater Design Report 3. STORMWATER DESIGN The proposed project includes the implementation of stormwater management devices in order to attenuate and infiltrate the runoff from portions of the proposed impervious area. The proposed stormwater management device shall be two shallow grassed depressions as described below. A. Shallow Grassed Depression Two shallow grassed depressions are proposed and located along portions of the proposed driveway area. These depressions will take stormwater from portions of the impervious driveway and upstream areas consisting of grass and woods. The total area contributing to these two shallow grass depressions are 13,600 SF (3,485 SF of impervious) and 14,425 SF (2,761 SF of impervious) respectively. The total storage of the shallow grassed depressions is on the order of 3,375 CF. During large storm events any overflows from the shallow grassed depressions will discharge offsite to match existing conditions, and have been designed to attenuate and infiltrate the maximum amount of the contributing runoff. In accordance with section 179-6-080 of the Town of Queensbury code the stormwater management system has been designed to limit the post-development runoff rates and volumes for the 25-year, 24-hour design storm event to less than the predevelopment runoff rates and volumes in order to prevent impacts to the downstream drainage corridors. HydroCAD stormwater modeling software was used to analyze the existing and proposed site conditions with the results summarized in the following table. Table 1: 25-Year Design Storm, Runoff Rates and Volumes Design Point Peak Runoff Rate (cfs) Runoff Volume (ac-ft) Predevelopment Post-Development Predevelopment Post-Development 1 15.09 14.93 0.98 0.93 4. SUMMARY The modifications to the proposed site will result in an increase in the amount of impervious area on the project site. While the drainage patterns will be generally the same as the existing condition the shallow grassed depressions will be included to provide infiltration on portions of proposed hard surfaces. In conclusion the proposed site modifications will not result in any increases in runoff rates and volumes from the site and will not result in any flooding of downstream properties. Respectively Submitted, Jakob Cruikshank, P.E. Environmental Design Partnership, LLP 9 Custom Soil Resource Report Soil Map 480131048013804801450480152048015904801660480173048018004801870480131048013804801450480152048015904801660480173048018004801870609170 609240 609310 609380 609450 609520 609590 609170 609240 609310 609380 609450 609520 609590 43° 21' 43'' N 73° 39' 10'' W43° 21' 43'' N73° 38' 50'' W43° 21' 23'' N 73° 39' 10'' W43° 21' 23'' N 73° 38' 50'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84 0 100 200 400 600 Feet 0 40 80 160 240 Meters Map Scale: 1:2,950 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features 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 1:15,800. 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: Warren County, New York Survey Area Data: Version 21, Sep 1, 2021 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 1, 2020—Oct 1, 2020 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. Custom Soil Resource Report 10 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI Fu Fluvaquents-Udifluvents complex, frequently flooded 4.5 24.3% HuB Hudson silt loam, 3 to 8 percent slopes 4.2 22.9% Ma Madalin silt loam 0.4 1.9% OaB Oakville loamy fine sand, 3 to 8 percent slopes 3.1 17.0% RhA Rhinebeck silt loam, 0 to 3 percent slopes 6.2 33.9% Totals for Area of Interest 18.4 100.0% Map Unit Descriptions The map units delineated on the detailed soil maps in a soil survey represent the soils or miscellaneous areas in the survey area. The map unit descriptions, along with the maps, can be used to determine the composition and properties of a unit. A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas. A map unit is identified and named according to the taxonomic classification of the dominant soils. Within a taxonomic class there are precisely defined limits for the properties of the soils. On the landscape, however, the soils are natural phenomena, and they have the characteristic variability of all natural phenomena. Thus, the range of some observed properties may extend beyond the limits defined for a taxonomic class. Areas of soils of a single taxonomic class rarely, if ever, can be mapped without including areas of other taxonomic classes. Consequently, every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit, and thus they do not affect use and management. These are called noncontrasting, or similar, components. They may or may not be mentioned in a particular map unit description. Other minor components, however, have properties and behavioral characteristics divergent enough to affect use or to require different management. These are called contrasting, or dissimilar, components. They generally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps. If included in the database for a given area, the contrasting minor components are identified in the map unit descriptions along with some characteristics of each. A few areas of minor components may not have been observed, and consequently they are not mentioned in the descriptions, especially where the pattern was so complex that it was impractical to make enough observations to identify all the soils and miscellaneous areas on the landscape. Custom Soil Resource Report 11 HuB—Hudson silt loam, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 9xx0 Elevation: 300 to 1,800 feet Mean annual precipitation: 37 to 46 inches Mean annual air temperature: 45 to 48 degrees F Frost-free period: 110 to 160 days Farmland classification: All areas are prime farmland Map Unit Composition Hudson and similar soils:85 percent Minor components:15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Hudson Setting Landform:Lake plains Landform position (two-dimensional):Summit Landform position (three-dimensional):Tread Down-slope shape:Concave Across-slope shape:Convex Parent material:Clayey and silty glaciolacustrine deposits Typical profile H1 - 0 to 7 inches: silt loam H2 - 7 to 14 inches: silty clay loam H3 - 14 to 30 inches: silty clay H4 - 30 to 60 inches: silt loam Properties and qualities Slope:3 to 8 percent Depth to restrictive feature:More than 80 inches Drainage class:Moderately well drained Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table:About 14 to 24 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:15 percent Available water supply, 0 to 60 inches: High (about 9.6 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2e Hydrologic Soil Group: C/D Ecological site: F144AY018NY - Moist Lake Plain Hydric soil rating: No Custom Soil Resource Report 15 Minor Components Elmridge Percent of map unit:5 percent Hydric soil rating: No Madalin Percent of map unit:5 percent Landform:Depressions Hydric soil rating: Yes Rhinebeck Percent of map unit:5 percent Hydric soil rating: No Ma—Madalin silt loam Map Unit Setting National map unit symbol: 9xx6 Elevation: 280 to 820 feet Mean annual precipitation: 37 to 46 inches Mean annual air temperature: 45 to 48 degrees F Frost-free period: 110 to 160 days Farmland classification: Farmland of statewide importance Map Unit Composition Madalin and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Madalin Setting Landform:Depressions Landform position (two-dimensional):Toeslope Landform position (three-dimensional):Tread Down-slope shape:Concave Across-slope shape:Concave Parent material:Clayey and silty glaciolacustrine deposits Typical profile H1 - 0 to 6 inches: silt loam H2 - 6 to 40 inches: silty clay H3 - 40 to 60 inches: silty clay Properties and qualities Slope:0 to 3 percent Depth to restrictive feature:More than 80 inches Drainage class:Poorly drained Capacity of the most limiting layer to transmit water (Ksat):Moderately low to moderately high (0.06 to 0.20 in/hr) Custom Soil Resource Report 16 Depth to water table:About 0 to 6 inches Frequency of flooding:None Frequency of ponding:None Calcium carbonate, maximum content:15 percent Available water supply, 0 to 60 inches: Moderate (about 8.1 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 4w Hydrologic Soil Group: C/D Ecological site: F144AY019NH - Wet Lake Plain Hydric soil rating: Yes Minor Components Hudson Percent of map unit:4 percent Hydric soil rating: No Rhinebeck Percent of map unit:4 percent Hydric soil rating: No Unnamed soils, substratum loamy or sandy Percent of map unit:2 percent Landform:Depressions Hydric soil rating: No OaB—Oakville loamy fine sand, 3 to 8 percent slopes Map Unit Setting National map unit symbol: 9xxd Elevation: 600 to 1,200 feet Mean annual precipitation: 37 to 46 inches Mean annual air temperature: 45 to 48 degrees F Frost-free period: 110 to 160 days Farmland classification: All areas are prime farmland Map Unit Composition Oakville and similar soils:90 percent Minor components:10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Oakville Setting Landform:Terraces, outwash plains, deltas Landform position (two-dimensional):Summit Landform position (three-dimensional):Tread Down-slope shape:Convex Across-slope shape:Convex Custom Soil Resource Report 17 Parent material:Sandy eolian, beach ridge, or glaciofluvial deposits Typical profile H1 - 0 to 8 inches: loamy fine sand H2 - 8 to 27 inches: sand H3 - 27 to 60 inches: sand Properties and qualities Slope:3 to 8 percent Depth to restrictive feature:More than 80 inches Drainage class:Well drained Capacity of the most limiting layer to transmit water (Ksat):High to very high (5.95 to 19.98 in/hr) Depth to water table:More than 80 inches Frequency of flooding:None Frequency of ponding:None Available water supply, 0 to 60 inches: Low (about 4.4 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 2s Hydrologic Soil Group: A Ecological site: F144AY022MA - Dry Outwash Hydric soil rating: No Minor Components Tioga Percent of map unit:4 percent Hydric soil rating: No Elnora Percent of map unit:3 percent Hydric soil rating: No Hinckley Percent of map unit:3 percent Hydric soil rating: No RhA—Rhinebeck silt loam, 0 to 3 percent slopes Map Unit Setting National map unit symbol: 9xxt Elevation: 80 to 1,000 feet Mean annual precipitation: 37 to 46 inches Mean annual air temperature: 45 to 48 degrees F Frost-free period: 110 to 160 days Farmland classification: Prime farmland if drained Map Unit Composition Rhinebeck and similar soils:85 percent Minor components:15 percent Custom Soil Resource Report 18 PRE . DP-1 NYSDEC Wetlands Routing Diagram for STORMWATER-HAVILAND Prepared by Environmental Design Partnership, Printed 9/7/2022 HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Subcat Reach Pond Link STORMWATER-HAVILAND Printed 9/7/2022Prepared by Environmental Design Partnership HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (sq-ft) CN Description (subcatchment-numbers) 35,822 80 >75% Grass cover, Good, HSG D (PRE) 4,630 98 Impervious, HSG D (PRE) 112,178 80 Pasture/grassland/range, Good, HSG D (PRE) 69,829 77 Woods, Good, HSG D (PRE) 222,459 79 TOTAL AREA Type II 24-hr 25 YR Rainfall=4.40"STORMWATER-HAVILAND Printed 9/7/2022Prepared by Environmental Design Partnership HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Time span=0.00-80.00 hrs, dt=0.05 hrs, 1601 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=222,459 sf 2.08% Impervious Runoff Depth=2.29"Subcatchment PRE: . Flow Length=237' Tc=14.9 min CN=79 Runoff=15.09 cfs 42,505 cf Inflow=15.09 cfs 42,505 cfLink DP-1: NYSDEC Wetlands Primary=15.09 cfs 42,505 cf POST1 . POST2 . POST3 . 1P Grassed Depression 2P Grassed Depression DP-1 NYSDEC Wetlands Routing Diagram for STORMWATER-HAVILAND Prepared by Environmental Design Partnership, Printed 9/7/2022 HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Subcat Reach Pond Link STORMWATER-HAVILAND Printed 9/7/2022Prepared by Environmental Design Partnership HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (sq-ft) CN Description (subcatchment-numbers) 53,352 80 >75% Grass cover, Good, HSG D (POST1, POST2, POST3) 24,225 98 Impervious, HSG D (POST1, POST2, POST3) 84,245 80 Pasture/grassland/range, Good, HSG D (POST1, POST2, POST3) 60,637 77 Woods, Good, HSG D (POST1, POST2, POST3) 222,459 81 TOTAL AREA Type II 24-hr 25 YR Rainfall=4.40"STORMWATER-HAVILAND Printed 9/7/2022Prepared by Environmental Design Partnership HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Time span=0.00-80.00 hrs, dt=0.05 hrs, 1601 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=194,401 sf 9.25% Impervious Runoff Depth=2.46"Subcatchment POST1: . Flow Length=148' Tc=13.4 min CN=81 Runoff=14.88 cfs 39,882 cf Runoff Area=13,632 sf 25.57% Impervious Runoff Depth=2.73"Subcatchment POST2: . Tc=6.0 min CN=84 Runoff=1.44 cfs 3,098 cf Runoff Area=14,426 sf 19.14% Impervious Runoff Depth=2.64"Subcatchment POST3: . Tc=6.0 min CN=83 Runoff=1.48 cfs 3,170 cf Peak Elev=331.65' Storage=1,858 cf Inflow=1.44 cfs 3,098 cfPond 1P: Grassed Depression Discarded=0.04 cfs 3,098 cf Primary=0.00 cfs 0 cf Outflow=0.04 cfs 3,098 cf Peak Elev=330.93' Storage=1,441 cf Inflow=1.48 cfs 3,170 cfPond 2P: Grassed Depression Discarded=0.03 cfs 2,409 cf Primary=0.51 cfs 761 cf Outflow=0.53 cfs 3,170 cf Inflow=14.93 cfs 40,643 cfLink DP-1: NYSDEC Wetlands Primary=14.93 cfs 40,643 cf Type II 24-hr 25 YR Rainfall=4.40"STORMWATER-HAVILAND Printed 9/7/2022Prepared by Environmental Design Partnership HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment POST1: . Runoff = 14.88 cfs @ 12.05 hrs, Volume= 39,882 cf, Depth= 2.46" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.05 hrs Type II 24-hr 25 YR Rainfall=4.40" Area (sf) CN Description 77,600 80 Pasture/grassland/range, Good, HSG D 42,870 80 >75% Grass cover, Good, HSG D 55,953 77 Woods, Good, HSG D * 17,978 98 Impervious, HSG D 194,401 81 Weighted Average 176,423 90.75% Pervious Area 17,978 9.25% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 12.8 100 0.0350 0.13 Sheet Flow, A Grass: Dense n= 0.240 P2= 2.54" 0.6 48 0.0420 1.42 Sheet Flow, B Smooth surfaces n= 0.011 P2= 2.54" 13.4 148 Total Summary for Subcatchment POST2: . Runoff = 1.44 cfs @ 11.97 hrs, Volume= 3,098 cf, Depth= 2.73" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.05 hrs Type II 24-hr 25 YR Rainfall=4.40" Area (sf) CN Description 2,953 80 Pasture/grassland/range, Good, HSG D 5,099 80 >75% Grass cover, Good, HSG D 2,094 77 Woods, Good, HSG D * 3,486 98 Impervious, HSG D 13,632 84 Weighted Average 10,146 74.43% Pervious Area 3,486 25.57% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Type II 24-hr 25 YR Rainfall=4.40"STORMWATER-HAVILAND Printed 9/7/2022Prepared by Environmental Design Partnership HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Summary for Subcatchment POST3: . Runoff = 1.48 cfs @ 11.97 hrs, Volume= 3,170 cf, Depth= 2.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-80.00 hrs, dt= 0.05 hrs Type II 24-hr 25 YR Rainfall=4.40" Area (sf) CN Description 3,692 80 Pasture/grassland/range, Good, HSG D 5,383 80 >75% Grass cover, Good, HSG D 2,590 77 Woods, Good, HSG D * 2,761 98 Impervious, HSG D 14,426 83 Weighted Average 11,665 80.86% Pervious Area 2,761 19.14% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Summary for Pond 1P: Grassed Depression Inflow Area = 13,632 sf, 25.57% Impervious, Inflow Depth = 2.73" for 25 YR event Inflow = 1.44 cfs @ 11.97 hrs, Volume= 3,098 cf Outflow = 0.04 cfs @ 15.05 hrs, Volume= 3,098 cf, Atten= 97%, Lag= 184.9 min Discarded = 0.04 cfs @ 15.05 hrs, Volume= 3,098 cf Primary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.05 hrs Peak Elev= 331.65' @ 15.05 hrs Surf.Area= 1,580 sf Storage= 1,858 cf Plug-Flow detention time= 587.3 min calculated for 3,096 cf (100% of inflow) Center-of-Mass det. time= 587.6 min ( 1,400.2 - 812.6 ) Volume Invert Avail.Storage Storage Description #1 330.00' 2,445 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 330.00 682 0 0 331.00 1,216 949 949 332.00 1,776 1,496 2,445 Device Routing Invert Outlet Devices #1 Primary 331.75'30.0' long x 3.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32 #2 Discarded 330.00'1.000 in/hr Exfiltration over Surface area Phase-In= 0.01' Type II 24-hr 25 YR Rainfall=4.40"STORMWATER-HAVILAND Printed 9/7/2022Prepared by Environmental Design Partnership HydroCAD® 10.00-20 s/n 11387 © 2017 HydroCAD Software Solutions LLC Discarded OutFlow Max=0.04 cfs @ 15.05 hrs HW=331.65' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=330.00' (Free Discharge) 1=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Summary for Pond 2P: Grassed Depression Inflow Area = 14,426 sf, 19.14% Impervious, Inflow Depth = 2.64" for 25 YR event Inflow = 1.48 cfs @ 11.97 hrs, Volume= 3,170 cf Outflow = 0.53 cfs @ 12.11 hrs, Volume= 3,170 cf, Atten= 64%, Lag= 8.8 min Discarded = 0.03 cfs @ 12.12 hrs, Volume= 2,409 cf Primary = 0.51 cfs @ 12.11 hrs, Volume= 761 cf Routing by Stor-Ind method, Time Span= 0.00-80.00 hrs, dt= 0.05 hrs Peak Elev= 330.93' @ 12.12 hrs Surf.Area= 1,111 sf Storage= 1,441 cf Plug-Flow detention time= 505.4 min calculated for 3,168 cf (100% of inflow) Center-of-Mass det. time= 505.9 min ( 1,321.6 - 815.7 ) Volume Invert Avail.Storage Storage Description #1 329.00' 1,523 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 329.00 406 0 0 330.00 750 578 578 331.00 1,139 945 1,523 Device Routing Invert Outlet Devices #1 Primary 330.85'10.0' long x 3.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 Coef. (English) 2.44 2.58 2.68 2.67 2.65 2.64 2.64 2.68 2.68 2.72 2.81 2.92 2.97 3.07 3.32 #2 Discarded 329.00'1.000 in/hr Exfiltration over Surface area Phase-In= 0.01' Discarded OutFlow Max=0.03 cfs @ 12.12 hrs HW=330.92' (Free Discharge) 2=Exfiltration (Exfiltration Controls 0.03 cfs) Primary OutFlow Max=0.44 cfs @ 12.11 hrs HW=330.92' (Free Discharge) 1=Broad-Crested Rectangular Weir (Weir Controls 0.44 cfs @ 0.64 fps) Summary for Link DP-1: NYSDEC Wetlands Inflow Area = 222,459 sf, 10.89% Impervious, Inflow Depth = 2.19" for 25 YR event Inflow = 14.93 cfs @ 12.06 hrs, Volume= 40,643 cf Primary = 14.93 cfs @ 12.06 hrs, Volume= 40,643 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-80.00 hrs, dt= 0.05 hrs HOUSEINV=312.36 48"CMP Area663839.1 Sq. Feet15.2 Acres Area1Wetlands Continue Area1-BSample Pt a4 Sample Pt a3 Sample Pt a2 Sample Pt a1 Sample Pt a9 Sample Pt a8Sample Pt a7 Sample Pt a6 Sample Pt a5 Sample Pt a14 Sample Pt a15 Stream AStream BSTORMWATER MAP FOR HAVILAND ROAD TOWN OF QUEENSBURY SEPTEMBER 6, 2022 HAVILAND MEADOWS1" = 100'PRE WATERSHEDMAPWARREN COUNTY, NEW YORK1 of 2TAX MAP. No. 289.16-1-5900 Route 146 Clifton Park, New York 12065 edpllp.com(518) 371-7621 E N V I R O N M E N T A L D E S I G N P A R T N E R S H I P, L L P. HOUSEINV=312.36 48"CMP Area663839.1 Sq. Feet15.2 Acres Area1Wetlands Continue Area1-BSample Pt a4 Sample Pt a3 Sample Pt a2 Sample Pt a1 Sample Pt a9 Sample Pt a8Sample Pt a7 Sample Pt a6 Sample Pt a5 Sample Pt a14 Sample Pt a15 Stream AStream BSTORMWATER MAP FOR HAVILAND ROAD TOWN OF QUEENSBURY SEPTEMBER 6, 2022 HAVILAND MEADOWS1" = 100'POST WATERSHEDMAPWARREN COUNTY, NEW YORK2 of 2TAX MAP. No. 289.16-1-5900 Route 146 Clifton Park, New York 12065 edpllp.com(518) 371-7621 E N V I R O N M E N T A L D E S I G N P A R T N E R S H I P, L L P.