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HomeMy WebLinkAboutSW3191101_SW Report_20191119B011LER E N G I N E E R I N G STORMWATER MANAGEMENT REPORT PREPARED FOR: CAMBRIDGE COMMONS MF, LLC CAMBRIDGE VILLAGE MULTI -FAMILY 307 PILOT KNOB ROAD DENVER, NC 28037 LINCOLN COUNTY OCTOBER 18, 2019 PREPARED BY: BOHLER ENGINEERING, NC, PLLC 1927 S. TYRON ST. SUITE 310 CHARLOTTE, NC 28203 ` eoeeo eo i � e � o° e o e Q 7< ° _ o SEAL o 047366 = °, Go Go ,� F��4 �jIl1111111\ V/9 NORTH CAROLINA LICENSE 9047366 STEVE FARMARTINO, P.E. PROFESSIONAL CERTIFICATION: I, STEVE FARMARTINO, HEREBY CERTIFY THAT THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME, AND THAT I AM A DULY LICENSED REGISTERED ENGINEER UNDER THE LAWS OF THE STATE OF NORTH CAROLINA, LICENSE NUMBER 043610 CIVIL & CONSULTING ENGINEERS ° SURVEYORS -TRAFFIC CONSULTANTS -ENVIRONMENTAL & GEOTECHNICAL ENGINEERS www.bolilereng.com BOHLER ENGINEERING 1927 S TRYON ST. ♦ SUITE 310 ♦ CHARLOTTE, NC 28203 ♦ 980.272.3400 Table of Contents GeneralProject Description............................................................................................................... 3 General Project Overview and Existing Conditions................................................................ 3 Stormwater Requirements and Design Overview.................................................................... 3 SCMSystems Overview..................................................................................3 Stormwater Management Analysis and BMP Calculations............................................................ 3 VolumeControl......... V................................................................................3 Prevs. Post Analysis................................................................................................................ 4 Appendix.............................................................................................................................................. 5 Pre- Development Drainage Map Post Development Drainage Map Stormwater Details Sand Filter Calculations Sand Filter BMP Design Procedure Forms Detention Worksheets HydroCAD Models Storm Sewers Results Soils Report Rip Rap Apron Calculations Ballast Pad Calculations Erosion Calculations General Project Description/Stormwater Management GENERAL PROJECT OVERVIEW AND EXISTING CONDITIONS The proposed development will be situated on approximately 10.6 acres, split between northern and southern sites by Cresset Dillinger Road. The development will include 9 multifamily residential buildings, a club house, several detached parking garages, and all associated traffic and utility infrastructure that is required. The site is almost entirely mostly wooded, with a single-family home located on a portion of the parcel south of Cresset Dillinger Road. The site has a ridge line running north to south approximately through the middle of the development. The drainage area west of this ridge will ultimately flow to a low point on the property, through a proposed wet pond, and into a bypass system. This bypass system eventually discharges to Forney Creek. The point of discharge from the proposed wet pond to the bypass system will be point -of -interest 1, or POI 1. The drainage area east of the ridge line drains toward Pilot Knob Road, where drainage swales convey water to a culvert under Pilot Knob Road, to its ultimate destination of Mountain Island Lake. The culvert under Pilot Knob Road is considered to be point -of -interest 2, or POI 2. CITY OF CHARLOTTE STORMWATER REQUIREMENTS OVERVIEW This site is located within the Western Catawba Watershed District, and a portion of the site discharges to class WS-IV waters. Because of these classifications, the following criteria will be used for this development: - The wet ponds have been designed to treat the first F of runoff with a drawdown time between 2- 5 days. - Wet ponds have been designed for 85% TSS removal. - Above the water quality volume, the 2-, 10-, and 25-year, 24-hour storm events have been controlled so that the post -development peak flows are less than their pre -development peak flows - Wet ponds have been designed to provide F of free board during the 100-year storm event. SCM SYSTEM OVERVIEW To meet the requirements described above, 2 wet ponds will be used Stormwater Management and BMP Calculations Water Quality Volume: The minimum required water quality volume to treat the first 1" of rainfall from the development has been calculated for Wet Pond #1 and #2 as 8,033 cubic feet and 18,585 cubic feet respectively. This volume is controlled in Wet Pond #1 and #2 using a water quality orifices of 1.00" and 1.50" in diameter respectively at the permanent pool elevations, with the next available outlet above the elevation required to meet the water quality volume. This orifice results in a drawdown of the water quality volume within 2- 5 days. BMP Sizing: The wet ponds are designed based on the impervious percentage draining to them, the average depth of the permanent pools as calculated by Option 2 from Figure 10-2b, and the resulting required surface area s to drainage areas ratio. These values and their calculations can be seen in the attached wet pond sizing and wet pond supplement spreadsheets. All drainage from impervious areas have been designed to be discharged into the forebays. The forebays has been designed to be approximately 20% of the total permanent pool storage volumes. A water quality orifices are used at the base of the riser structures to draw down the water quality volumes within 2-5 days. The next available outlets on the riser structures are placed above the required water quality volumes. The elevations of this next available outlets are considered the temporary pool volumes, and these elevations (and resulting pressure head values used for the orifice equation) were used when determining the drawdown times through the water quality orifices. Pre/Post Analysis: A summary of the pre/post peak discharge rates for each point of interest within the development have been listed below. Support calculations have been included within the appendix section of this report. POI-1 Pre -Development Post- Development Total DA Total DA 2-year 9.90 cfs 3.75 cfs 10- ear 19.99 cfs 10.84 cfs 25- ear 26.73 cfs 14.43 cfs POI-2 Pre -Development Post- Development Total DA Total DA 2-year 10.10 cfs 5.02 cfs 10- ear 21.14 cfs 12.42 cfs 25- ear 28.52 cfs 25.60 cfs USDA SOIL SURVEY 35° 26'46"N Hydrologic Soil Group —Lincoln County, North Carolina (Cambridge Village - Soil Survey) 500550 500610 500670 500730 500790 r. (. lip JJ a 500550 500610 500670 500730 500790 Map Scale: 1:2,630 if printed on A portrait (8.5" x 11") sheet. Meters $ N 0 35 70 140 210 Feet 0 100 200 400 600 Map projection: Web Mercator Conermordinates: WGS84 Edge tics: lfrM Zone 17N WGS84 USDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 500850 500910 500910 10/11 /2019 Pagel of 4 35° 273" N 35° 26' 46" N Hydrologic Soil Group —Lincoln County, North Carolina (Cambridge Village - Soil Survey) MAP LEGEND Area of Interest (AOI) 0 Area of Interest (AOI) Soils Soil Rating Polygons 0 A 0 A/D 0 B 0 B/D 0 C 0 C/D 0 D 0 Not rated or not available Soil Rating Lines r 0 A r 0 A/D B r B/D N 0 C r 0 C/D r 0 D r 0 Not rated or not available Soil Rating Points 0 A 0 A/D 0 B 0 B/D ❑ C 0 C/D 0 D ❑ Not rated or not available Water Features Streams and Canals Transportation — Rails ­0 Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. 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: Lincoln County, North Carolina Survey Area Data: Version 23, Sep 16, 2019 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Apr 23, 2014—Nov 28, 2017 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. USDA Natural Resources Web Soil Survey 10/11/2019 Conservation Service National Cooperative Soil Survey Page 2 of 4 Hydrologic Soil Group —Lincoln County, North Carolina Cambridge Village - Soil Survey Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI LdB2 Lloyd sandy clay loam, 2 to 8 percent slopes, moderately eroded B 12.0 87.7% LdC2 Lloyd sandy clay loam, 8 to 15 percent slopes, moderately eroded B 1.7 12.3% Totals for Area of Interest 13.7 100.0% Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. USDA Natural Resources Web Soil Survey 10/11/2019 Conservation Service National Cooperative Soil Survey Page 3 of 4 Hydrologic Soil Group —Lincoln County, North Carolina Cambridge Village - Soil Survey Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff.- None Specified Tie -break Rule: Higher USDA Natural Resources Web Soil Survey 10/11/2019 Conservation Service National Cooperative Soil Survey Page 4 of 4 DRAINAGE AREA MAPS �- z 0 7 v� ' 0 o x o u ed P4 H - J H / / / `\ ` 1, \ \\ \\ \` II I ' I `\ `\ I ` `\ `\ `\ / /' / / / ' ------- \ \ \ / / / , \ ' / /''" / �� / / % / `\ `♦ `\ \ \` `\ I 1\ \ `\ \ \\ I \ \`\ \ `\ \\ I� cl� � � O Q LL (/) < Q , j Q \\�/ % \ , /'''' / ',/ ,------ ' / \ , \ \ \ / / I./ \ \ \ .` \ / i / ` 1, \ \ , ] = 0e Q - J `\ I\\ I\\ \\ `\ \\ I`I \ III \\ \\ \\ \\r--806--___ /' / \ , ° z / ` `N `\ \\ /'' , t I `\ \I I I \\ / \ \ \I \I `\ \\ `\ II 11 \ ,I \ \\ \\ ) /""�,______- -----8 `J / II I ZO "I. 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LAND USE = Shopping Center ESTIMATED PERCENT IMPERVIOUS = 73M 1) SA/DA RATIO: AVERAGE POOL DEPTH = 4 FEET PERCENT IMPERVIOUS = 73% SA/DA = 2.21 % = 0.0221 SA REQUIRED = 3.13 Ac. X 0.0221 = 0.07 Ac. = 3,013 SF 2) TEMPORARY WATER QUALITY POOL REQUIREMENTS PROVID E TO DETAIN THE 1" STORM EVENT ABOVE THE ELEVATION ALLOCA A PERMANENT POOL THE VOL= FOR THE 1" STORM EVENT CAN BE CALCULATED AS: V, _ (Design Rainfall)(Rv)(Drainage Area) Design Rainfall = 1 Inch Drainage Area = 3.13 Acres Rv = 0.05 + 0.9(1) 1 = Percent Impervious = 73% Rv = 0.71 in./in. V, = 0.184 acre-feet = 8,033 fts 3) Pond Drawdown Time Pond Height above Orifice =- feet Orifice Invert Elevation = feet Orifice Diameter (D) _— inches = 0.08 feet Orifice Area (a) = 0.0055 square feet Gravitational Constant (g) = 32.2 ft/sec2 Head (H) = 3.71 feet Driving Head (Ho) = 1.236 feet Discharge Coefficient (CD) = 0.6 Drawdown rate (Q) = 0.029 cfs Time (t) = 275,119 seconds = 3.18 days Note: The calculation is based on the orifice equation where: ]above Y — CD 2gH. 10/28/2019 1:45 PM Page 1 of 1 Wet Pond #1 Design Wet Pond D Treatment Volume Elev Area (sf) Inc Storage (cf) Total Storage (cf) 788.25 8,900 0 0 789.00 9,858 7,034 7,034 790.00 11,185 10,522 17,556 791.00 12,569 11,877 29,433 792.00 14,008 13,289 42,721 Wet Pond D Permanent Pool Volume - Main Pool Elev Area (sf) Inc Storage (cf) Total Storage (cf) 782.00 1,189 0 0 783.00 1,650 1,420 1,420 784.00 2,179 1,915 3,334 785.00 2,777 2,478 5,812 786.00 3,444 3,111 8,923 787.00 4,176 3,810 12,733 788.00 4,176 4,176 16,909 788.25 4,176 1,044 17,953 Wet Pond D Permanent Pool - Forebav Elev Area (sf) Inc Storage (cf) Total Storage (cf) 785.00 360 0 0 786.00 983 672 672 787.00 1,618 1,301 1,972 788.00 1,618 1,618 3,590 788.25 1,618 405 3,995 Wet Pond 5 - Treatment Summary Requirements Total Treatment Volume Req. (cf) = 8,033 Total Treatment Volume Prov. (cf) = 29,433 Total Treatment Surface Area Req. (sf) = 3,013 Total Treatment Surface Area Prov. (sf) = 8,900 Wet Pond 5 - Permanent Pool Summary Requirements Total Permanent Pool Surface Area (sf) = 8,900 Permanent Pool Average Depth Req. (ft) = 6.5 Permanent Pool Average Depth Prov.(ft) - 4.0 Wet Pond 5 - Forebay Summary Requirements Forebay#1 Volume Req. (20%) = 2,547 Forebay#1 Provided (cf) = 0 Forebay#1 Percentage Provided - 0.00% Forebay Treatment Volumes PROVIDE VOLUME TO DETAIN THE 1" STORM EVENT ABOVE THE ELEVATION ALLOCATED AS A PERMANENT POOL Forebay #1 THE VOLUME FOR THE 1" STORM EVENT CAN BE CALCULATED AS: V, _ (Design Rainfall)(Rv)(Drainage Area) % Impervious Design Rainfall = -Inch Drainage Area = -Acres Rv = 0.05 + 0.009(I) I = Percent Impervious = - Rv=-in./in. Vi= acre-feet = ft' Vreq= 1606.57 Permanent Pool Average Depth Calculation Surface area at bottom of shelf, including forebay (sq. ft) = 6,217 Surface area at permanent pool level, including Forebay (sq. ft) = 8,900 Surface area at the bottom of pond (sq. ft) = 1,189 Depth, distance btwn bottom of shelf and pond bottom (ft) = 6.00 Permanent pool average depth = 10/17/2019 3:39 PM Page 1 of 1 WET POND #2 CAMBRIDGE VILLAGE (DENVER, NC) DESIGN: WATER QUALITY TO MEET�§EMOVAL - GIVEN: DRAINAGE AREA TO FACILITY = -Ac. LAND USE = Residential ESTIMATED PERCENT IMPERVIOUS = - 1) SA/DA RATI O: AVERAGE POOL DEPTH = 4 FEET PERCENT IMPERVIOUS = 66% SA/DA = 1.90 % = 0.0190 SA REQUIRED = 7.95 Ac. X 0.0190 = 0.15 Ac. = 6,580 SF 2) TEMPORARY WATER QUALITY POOL REQUIREMENTS PROVIDE VOLUME TO DETAIN THE 1" STORM EVENT ABOVE THE ELEVATION ALLOCATED AS A PERMANENT POOL THE VOLUME FOR THE 1" STORM EVENT CAN BE CALCULATED AS: V, _ (Design Rainfall)(Rv)(Drainage Area) Design Rainfall = -Inch Drainage Area = 7.95 Acres Rv=0.05+0.9(1) 1 = Percent Impervious = 66% Rv = 0.64 in./in. Vi = 0.427 acre-feet = 18,585 ft' 3) Pond Drawdown Time Pond Height above Orifice=W3.00,feet Orifice Invert Elevation = 6.50 feet Orifice Diameter (D) _- inches = 0.13 feet Orifice Area (a) = 0.0123 square feet Gravitational Constant (g) = 32.2 ft1sec2 Head (H) = 6.44 feet Driving Head (Ho) = 2.146 feet Discharge Coefficient (CD) = 0.6 Drawdown rate (Q) = 0.087 cfs Time (t) = 214,713 seconds = 2.49 days Note: Theabovecalculation is based on the orifice equation where: Y = Cn ZSHo 10/17/2019 3:40 PM Page 1 of 1 Wet Pond #2 Design Wet Pond D Treatment Volume Elev Area (so Inc Storage (cf) Total Storage (co 776.50 9,604 0 0 777.00 11,638 5,311 5,311 778.00 13,738 12,688 17,999 779.00 15,894 14,816 32,815 780.00 18,107 17,001 49,815 781.00 20,376 19,242 69,057 782.00 22,702 21,539 90,596 Wet Pond D Permanent Pool Volume - Main Pool Area (sf) Inc Storage (co Total Storage (co 771 1893 776 6102 19,988 19,988 776.5 7231 3,333 23,321 Wet Pond D Permanent Pool - Forebav Elev Area (so I nc Storage (co Total Storage (co 774.00 725 776.00 1,670 2,395 2,395 776.50 2,277 987 3,382 Wet Pond 5 - Treatment Summary Requirements Total Treatment Volume Req. (co = Total Treatment Volume Prov. (co = Total Treatment Surface Area Req. (so = Total Treatment Surface Area Prov.(so = 18,585 69,057 6,580 9,604 Wet Pond 5 - Permanent Pool Summary Requirements Total Permanent Pool Surface Area (so = Permanent Pool Average Depth Req. (ft) = Permanent Pool Average Depth Prov.(ft) = 9,604 4.0 4.1 Wet Pond 5 - Forebay Summary Requirements Forebay#1 Volume Req. (10%) = Forebay#1 Provided (co = Forebay#1 Percentage Provided - 1,858 3,382 18.20% Forebay Treatment Volumes PROVIDE VOLUME TO DETAIN THE 1" STORM EVENT ABOVE THE ELEVATION ALLOCATED AS A PERMANENT POOL Forebay #1 THE VOLUME FOR THE 1" STORM EVENT CAN BE CALCULATED AS: V, _ (Design Rainfall)(Rv)(Drainage Area) Impervious Design Rainfall = -Inch Drainage Area = -Acres Rv = 0.05 + 0.009(I) I = Percent Impervious = moffhoiEn Rv = in./in. Vi= 0.427 acre-feet= 18,585 ft' Vreq= 3716.97 Permanent Pool Average Depth Calculation Surface area at bottom of shelf, including forebay (sq. fo = 8,772 Surface area at permanent pool level, including forebay (sq. ft; = 9,604 Surface area at the bottom of pond (sq. ft) = 1,893 Depth, distance btwn bottom of shelf and pond bottom (fo = 6.00 Permanent pool average depth = 10/18/2019 10:35 AM Page 1 of 1 WET POND DETAILS PLAN VIEW 6" BMP Inset Table Wet Pond Project Name: Moores Chapel Subdivision SequencelD: 1 Surface Area (sq. ft.): 35,615 Drainage Area (acres): 19.6 Land Use/Development Type: Yp Residential Percent Built -Upon Area: 52% Permanent Pool Depth (ft.): 8.0 Forebay Permanent Pool Depth (ft.): 6.0 Flow Diverter Present (YIN): N Regulated By: PCO Treatment Effectiveness: Optimal NC State Plane X (easting): 1,408,500 NC State Plane Y (northing): 558,035 TRENCH WIDTH GRADE =11 W a w% ITIi = ILI O-RING RCP (DIAMETER - i VARIES) a. ;....�.. 11 . i ° � II 12. I I=1I I=III I ANTI -SEEP COLLAR. CLASS B CONCRETE OR COMPACTED CLAY WITH INFILTRATION RATE OF 0.01 INCHES PER HOUR OR LESS. SECTION A -A ANTI -SEEP CO][,][,AR FRONT VIEW FRASH RACK TO OUTLET ROL STRUCTURE WITH AT TOP OF RISER STRUCTURE 33 PIPE HICK STRIPES AT V INTERVALS CK RED STRIPE AT T DEPTH MARKER BOTTOM OF FOI SEDIMENT DEPTH MARKER ER NOT TO SCALE SO CAGE CAN BE LIFTED AINTENANCE SCREW TYPE PLUG 6" 6" PVC PIPE AND TEE 3"X3" OPENINGS PERMANENT POOL SECONDARY ORIFICE TRASH RACK 12" PVC CAP WITH HOLE DRILLED PER WATER QUALITY ORIFICE SIZE LISTED FOR WET POND NOTES: 1. DRAW DOWN ASSEMBLY SHALL NOT BE INSTALLED UNTIL WET DETENTION BASIN IS STABILIZED. j? DRA WDOWN A SS EMB LAY NOT TO SCALE NOT TO SCALE TOP OF POND = 792.0' FABRICATED ALUMINUM BAR GRATE DRAINAGE STRUCTURE STEPS (NCDOT FABRICATED ALUMINUM BAR TRASH RACK WITH 5UM OPENINGS STD 840.66) INSIDE AND OUTSIDE OF _ _ _ _ GRATE TRASH RACK WITH STRUCTURE SPACED V VERTICALLY (TYP) 5"X5" OPENINGS 24N8" SECONDARY ORIFICE ELEV = 789.2' TOP OF RISER = 791.0' 24" 0-RING OUTLET CULVERT ELEV = 788.3'� 1 4'X4' (INT. DIMS) OUTLET CONTROLSTRUCTURE� 6" PVC DRAWDOWN ASSEMBLY R - WITH 1.0" WATER QUALITY ORIFICE ELEV. = 788.3' I/ I I■■■f ■ TRASH RACK SECONDARY ORIFICE ----- PERMANENT POOL = 788.3' SECONDARY CONTROL ORIFICE PERMANENT WATER QUALITY ORIFICE 0-RING OUTLET CULVERT WITH ANTI -SEEP COLLARS. 5'X5'X2' CONCRETE BALLAST PAD -,"COMPACT FILL UNDER PIPE (INCLUDING PRECAST BOX WALLS 6" PVC DRAWDOWN ASSEMBLY PER GEOTECH REPORT. AND BOTTOM SLAB, FILL BOTTOM WITH 1" ORIFICE DRILLED IN NOTES: OF STRUCTURE WITH CONCRETE CAP AT BOTTOM SEE NCDOT SPECIFICATION SECTION 840 FOR OUTLET AND PROVIDE SMOOTH FINISH AT STRUCTURE BOX, GRATE, REINFORCING, ETC. INVERT OF STRUCTURE) WET POND #1 OUTLET CONTROL STRUCTURE DETAIL CNCR TO BE MIN.4,000 PSI COMPRESSIVE SALL TRENOGTH.ETE NTS CONVERT HOLE USED WITH SKIMMER DURING EROSION CONTROL TO PERMANENT WATER QUALITY ORIFICE WITH WET POND WHERE POSSIBLE. IF NOT POSSIBLE, SEAL AND GROUT FILL HOLE USED FOR SKIMMER. 1 1 ; I I , 1 1 , I , I � , 1 � , 1 I I� I I � I I I � 1 ' 1 � � 1 BTM OF FOREBAY: 785.0 BTM OF SEDIMENT STORAGE: 784.5 (BTM SEDIMENT STORAGE NOT REFLECTED IN PROP CONTOURS) I I I I I I /I , I , I , I ' /I , I , I I I I I I I I I I I I 0000, I II \ I \ I \ I \ I \ � I 1 i \ � I 1 , 1 , 1 , I 11 0000, I \ I 1 1 1 1 1 1 1 1 SLOPES ABOVE VEGETATED SHELF SEDIMENT DEPTH MARKER PE INVEfj)T = 776.50' (A1) \ 1 \ \ 1 \ 1 \ \ 1 1 \ \ 1 CT `. BTM OF POND: 781.0 BTM OF SEDIMENT STORAGE: 780.5 (BTM SEDIMENT STORAGE NOT REFLECTED IN PROP CONTOURS) 0001, 0000 787.00 \` I I 1 1 1 I 1 I 1 1 1 1 1 1 1 1 1 1 \ 1 1 1 1 1 1 1 - IUU-TMJ I UKIVI CLCV=[yU.06 = 25-YR STORM ELEV = 789.62' L 10-YR STORM ELEV = 789.55' - TOP OF FOREBAY BERM = 787.0' 2-YR STORM ELEV = 789.42' TEMPORARY POOL (WQV) = 789.2' L PERMANENT POOL = 788.3' - = TOTAL VOLUME = 0.504 AC -FT a 10' EMERGENCY SPILLWAY G 791.50 I 787.501 zz - w Of w 3:1 SLOPES ABOVE PERMANENT POOL o " m 0 LU w TOP OF RISER STRUCTURE = 791.0'� 0 � u_ r � o 0 6' WIDE, 6:1 VEGETATED SHELF CLASS B RIP -RAP LINED FOREBAY BERM/ OVERFLOW SPILLWAY FO Y OFF TH)H) 3:1 SLOPES UNDER PERMANENT POOL PUMP TO DRAIN IF NECESSARY FOR POND MAINTENANCE rTOM FOREBAY = 785.0' 1 SEDIMENT STORAGE = 784.5' 6' WIDE, 6:1 VEGETATED BOTTOM POND = 781.0' — BOTTOM SEDIMENT STORAGE = 780.5' I / ; I I I i I I I I � I I I I I \ I � I I \ I ` z 1 \ \ \ \ 1 BTM OF FOREBAY: 785.0 \\\ BTM OF SEDIMENT STORAGE: 784.5 (BTM SEDIMENT STORAGE NOT REFLECTED IN PROP CONTOURS) `\\ REVISIONS REV DATE COMMENT BY \ t> ' \`I i\ \ >�P� 1 STM B-10 _\ STM B-20 MHO NOT APPROVED FOR \` \` CONSTRUCTION PROJECT No.: FLB190107 DRAWN BY: TGH CHECKED BY: APL &0 DATE: 08/27/19 SCALE: AS NOTED CAD I.D.: - SWO Q� I ` QJ Q-I\ I STM > \ `\ / d)``\\ I = I iv —EMERGENCY SPILLWAY ELEV = 791.5' LINED WITH 18" THICK CLASS A RIP -RAP 0-RING OUTFLOW CULVERT TO RIP -RAP DISCHARGE POINT `—COMPACT FILL UNDER OUTLET PIPE PER GEOTECHNICAL REPORT ANTI -SEEP COLLARS (REFER TO DETAIL ON SAME PAGE) 3:1 SLOPES UNDER PERMANENT POOL r� GENERAL NOTES: 1. BOTTOM OF POND AND BOTTOM OF FOREBAY GRADES SHOWN IN PLAN VIEW DO NOT REFLECT SEDIMENT STORAGE ELEVATIONS CONTOURS. PROJECT: }� CAT BRIDG E VILLAGE MULTIFAMILY I ® LO NORTH PILOT KNOB ROAD LLC LOCATION OF SITE CAMBRIDGE VILLAGE 307 PILOT KNOB RD DENVER, NC 28037 LINCOLN COUNTY DD OO Z �TEH ]ENGINEERING NC, P LILC NCBELS P-1132 1927 S. TRYON STREET, SUITE 310 CHARLOTTE, NC 28203 Phone: (980) 272-3400 Fax: (980) 272-3401 NC@)30hierEng.com \\\1111111p111///,/ ° SEAL - 047366 °FG I,IFI rSHEET TITLE: WET POND DETAIL SHEET NUMBER: C-415 C:\USERS\MMOOREAPPDATA\LOCAL\TEMP\ACPUBLISH_15128\NCC172159- SWO.DWG PRINTED BY: MMOORE 10.25.19 @ 11:07 AM LAST SAVED BY: MMOORE WET POND q CROSS SECTION AFTER STABILIZATION BUT PRIOR TO PAVING, POND Y V !1 SJ SECTION TO BE DREDGED AND CONVERTED FROM SKIMMER NTS (10:1 VLRTICA]L EYAGGERAT1ON) SEDIMENT BASIN TO PERMANENT WET POND. GENERAL NOTES: 1. BOTTOM OF POND AND BOTTOM OF FOREBAY GRADES SHOWN IN PLAN VIEW DO NOT REFLECT SEDIMENT STORAGE ELEVATIONS CONTOURS. PROJECT: }� CAT BRIDG E VILLAGE MULTIFAMILY I ® LO NORTH PILOT KNOB ROAD LLC LOCATION OF SITE CAMBRIDGE VILLAGE 307 PILOT KNOB RD DENVER, NC 28037 LINCOLN COUNTY DD OO Z �TEH ]ENGINEERING NC, P LILC NCBELS P-1132 1927 S. TRYON STREET, SUITE 310 CHARLOTTE, NC 28203 Phone: (980) 272-3400 Fax: (980) 272-3401 NC@)30hierEng.com \\\1111111p111///,/ ° SEAL - 047366 °FG I,IFI rSHEET TITLE: WET POND DETAIL SHEET NUMBER: C-415 C:\USERS\MMOOREAPPDATA\LOCAL\TEMP\ACPUBLISH_15128\NCC172159- SWO.DWG PRINTED BY: MMOORE 10.25.19 @ 11:07 AM LAST SAVED BY: MMOORE WET POND q CROSS SECTION AFTER STABILIZATION BUT PRIOR TO PAVING, POND Y V !1 SJ SECTION TO BE DREDGED AND CONVERTED FROM SKIMMER NTS (10:1 VLRTICA]L EYAGGERAT1ON) SEDIMENT BASIN TO PERMANENT WET POND. PLAN VIEW 6" BMP Inset Table Wet Pond Project Name: Moores Chapel Subdivision SequencelD: 1 Surface Area (sq. ft.): 35,615 Drainage Area (acres): 19.6 Land Use/Development Type: Residential Percent Built -Upon Area: 52% Permanent Pool Depth (ft.): 8.0 Forebay Permanent Pool Depth (ft.): 6.0 Flow Diverter Present (YIN): N Regulated By: PCO Treatment Effectiveness: Optimal NC State Plane X (easting): 1,408,500 NC State Plane Y (northing): 558,035 TRENCH WIDTH I- =1 $ a T II e+4 = j� O-RING RCP (DIAMETER i VARIES) 4. • e,z• a.. '.....ill=lll.�lllll ` . 4 1 III ANTI -SEEP COLLAR. CLASS B CONCRETE OR COMPACTED CLAY WITH INFILTRATION RATE OF 0.01 INCHES PER HOUR OR LESS. SECTION A -A ANTI -SEEP CO][,][,AR NTS FRASH RACK TO OUTLET ROL STRUCTURE WITH SO CAGE CAN BE LIFTED AINTENANCE 3"X3" OPENINGS AT TOP OF RISER STRUCTURE PIPE HICK STRIPES AT V INTERVALS CK RED STRIPE AT T DEPTH MARKER BOTTOM OF FOI SEDIMENT DEPTH MARKER ER NOT TO SCALE SCREW TYPE PLUG 6" 6" PVC PIPE AND TEE --PERMANENT POOL 12" PVC CAP WITH HOLE DRILLED PER WATER QUALITY ORIFICE SIZE LISTED FOR WET POND / / a -R , Sr PATIO 1 \ i / OF J / PROP-Q0"f E WI PARKING SPACES 8 STORAGE SPAC , 1 ,TOP UTILITY: 15" HDPE STORM\ BOT. UTILITY: 8" PVC SAN,50 ' ' 15" HDPE STORM. EL= 777.291 8" PVC SAN TOP EL= 776.18 / ST ' " c a1 TOP UTILITY: 8" PVC SAN I BOT. UTILITY: 24" HDPE STORM 1 8" PVC SAN BOT. EL= 783.00 24"HDPE STORM TOP EL= 783.52 i ` -b KUF 7/TI:�,U�dp ANU GI al�H STM -------- -- / S 2M STM B 30 , , �:1 SAFETY SHELF FRONT VIEW / NOTES: 1. DRAW DOWN ASSEMBLY SHALL NOT BE INSTALLED UNTIL WET DETENTION BASIN IS STABILIZED. SECONDARY ORIFICE TRASH RACK DRAWDOWN ASSEMBLY NOT TO SCALE NOT TO SCALE TOP OF POND = 783.0' FABRICATED ALUMINUM BAR GRATE DRAINAGE STRUCTURE STEPS (NCDOT FABRICATED ALUMINUM BAR TRASH RACK WITH 5"X5"OPENINGS STD 840.66) INSIDE AND OUTSIDE OF __ , GRATE TRASH RACK WITH STRUCTURE SPACED V VERTICALLY (TYP) i 5"X5" OPENINGS / � I / TOP OF RISER = 780.75' 24"x8" SECONDARY ORIFICE ELEV = 7782 4'X4' (INT. DIMS) OUTLET CONTROL STRUCTURE 6" PVC DRAWDOWN ASSEMBLY WITH 1.5" WATER QUALITY ORIFICE ELEV. = 776.5' 5'X5'X14' CONCRETE BALLAST PAD (INCLUDING PRECAST BOX WALLS AND BOTTOM SLAB, FILL BOTTOM OF STRUCTURE WITH CONCRETE SECONDARY CONTROL ORIFICE PERMANENT WATER QUALITY ORIFICE 0-RING OUTLET CULVERT WITH ANTI -SEEP COLLARS. 24" 0-RING OUTLET CULVERT COMPACT FILL UNDER PIPE ELEV = 766.7' 6" PVC DRAWDOWN ASSEMBLY PER GEOTECH REPORT. WITH 1.5" ORIFICE DRILLED IN NOTES: CAP AT BOTTOM SEE NCDOT SPECIFICATION SECTION 840 FOR OUTLET STRUCTURE BOX, GRATE, REINFORCING, ETC. AND PROVIDE SMOOTH FINISH AT INVERT OF STRUCTURE) CONCRETEALL TO BE MIN. 4,000 PSI COMPRESSIVE�ETPmoND2JUTLa CONTROL L STRUCTURE ��TAILSTRENGTH. NTSCONVERT HOLE USED WITH SKIMMER DURING EROSION CONTROL TO PERMANENT WATER QUALITY ORIFICE WITH WET POND WHERE POSSIBLE. IF NOT POSSIBLE, SEAL AND GROUT FILL HOLE USED FOR SKIMMER. --------------- 24N4" SECONDARY ORIFICE ELEV = —SECONDARY ORIFICE TRASH RACK - - - PERMANENT POOL = 776.5' 10Z.01) Ile -------- 77 - 10,300 SF >>6 _ ------ l` - --- 777-------------- _ - - - - ------------------------------- _ ------------------------------ --- - - - - 778 ------------ - - - - - QQ UNITS) ------------------------------- - - 779 -- - --- r2U U S — 782 784 _ -- ----------- 785 ---- ----------- -- -- - --- --- -- ----- - — — _-------- 786 ---- 2------- ___ - _ 7 88 ---� ✓ �'------------ - ` ``------------' \ ``` ``,9------ _-------w___, -- --- -= - _ -------------------- t�------- _ _ _ ------ _ �--�; ;= BTM OF POND: 774.0 ,93 1 \ - - /� ;,--------------- -- T73 - - N R \ - BTM OF SEDIMENT STORAGE' 5 NOT APPROVED ROVE D FO ` ------------ REFLECTED SEDIMENT STORAGE NO `\\ BTM OF POND: 771.0 _ - - ' ` - REFLECTED IN PROP CONTOURS) �' ; CONSTRUCTION BTM OF SEDIMENT STORAGE: 770.5 / - (BTM SEDIMENT STORAGE NOT \ REFLECTED IN PROP CONTOURS) % % ____ \--------------r, `` `\ � � � � PROJECT No.: FLB190107 --'- DRAWN BY: TGH ---- ---- -----''� ---- CHECKED BY: APL - --------- DATE: 08/27/19 ----'' I < SCALEAS NOTED ------------------------------ --------------- ---------------------------------- CAD - SWO — - - _ 796-- --- ` 4, ' \ co/vcfiff SUPPLY CO"A", 797 \�421, PG 588 P%RCEZI 0052 \ gyp-) 44 z Q W (7 O X J H y 44�T4 H O Q L �za�Q = Q O Q w e� ® O Q Q In W o 0 a � W Z Q >�z o ® pD o ae z z > z ��' (D OwwQ=z o �= Lr z W = J Z 0 J< m°O0D-5 �N= z� ...... W In o m�z w �W Q o o waa>LIU w =m m p C� �m zo (0Q <F- j W O t 0 m = - m M, �� �j 4ppr��7Lyiy,� za O S~ W O W In a a J In rr a r � � � �o W �T4 o Ow o= �. �(� 4 �� >ww W Q Q Z Z �- Z 0 0 w o 4 Q 0 I. I. azmzz02 EVISIONS REV DATE COMMENT BY 1 SLOPES ABOVE VEGETATED SHELF SEDIMENT DEPTH MARKER = 100-YR STORM ELEV = 781.64' - 25-YR STORM ELEV = 781.18' — V 10-YR STORM ELEV = 780.57' — TOP OF FOREBAY BERM = 776.0' PIPE INVE T = 776.50' (A1) 2-YR STORM ELEV = 779.09' _ - V TEMPORARY POOL (WQV) = 778.0' V PERMANENT POOL = 776.5' — = TOTAL VOLUME = 1.59 AC -FT zLU -w W LU 3:1 SLOPES ABOVE PERMANENT POOL o " co 0 LLI w TOP OF RISER STRUCTURE = 780.8' =W L, A} d 0 6' WIDE, 6:1 VEGETATED SHELF—, 6' WIDE, 6:1 VEGETATED SHELF CLASS BRIP-RAP LINED FOREBAY BERM/ OVERFLOW SPILLWAY \_FOREBOFFTH) TH) 3:1 SLOPES UNDER PERMANENT POOL PUMP TO DRAIN IF NECESSARY FOR POND MAINTENANCE BOTTOM FOREBAY = 774.0' BOTTOM SEDIMENT STORAGE = 773BOTTOM POND = 771.0' .5' SEDIMENT STORAGE = 770.5' 0-RING OUTFLOW CULVERT TO RIP -RAP DISCHARGE POINT `—COMPACT FILL UNDER OUTLET PIPE PER GEOTECHNICAL REPORT ANTI -SEEP COLLARS (REFER TO DETAIL ON SAME PAGE) 3:1 SLOPES UNDER PERMANENT POOL 30 15 7.5 0 30 1 "= 30' GENERAL NOTES: 1. BOTTOM OF POND AND BOTTOM OF FOREBAY GRADES SHOWN IN PLAN VIEW DO NOT REFLECT SEDIMENT STORAGE ELEVATIONS CONTOURS. PROJECT: CAMBRIDG E VILLAGE MULTIFAMILY FOR NORTH PILOT KNOB ROAD, LLC LOCATION OF SITE CAMBRIDGE VILLAGE 307 PILOT KNOB RD DENVER, NC 28037 LINCOLN COUNTY 1927 S. TRYON STREET, SUITE 310 CHARLOTTE, NC 28203 Phone: (980) 272-3400 Fax: (980) 272-3401 NC@)3ohlerEng.com \\\1111111p111// ° SEAL - o 047366 % °FG � A rSHEET TITLE: WET POND DETAIL SHEET NUMBER: C-415 C:\USERS\MMOOREAPPDATA\LOCAL\TEMPACPUBLISH_15128\NCC172159- SWO.DWG PRINTED BY: MMOORE 10.25.19 @ 11:07 AM LAST SAVED BY: MMOORE WET POND 2 CROSS SECTION NTS (10:1 VERTICAL ENAGGERATION) AFTER STABILIZATION BUT PRIOR TO PAVING, POND TO BE DREDGED AND CONVERTED FROM SKIMMER SEDIMENT BASIN TO PERMANENT WET POND. HYDROCAD ANALYSIS Ex DA-1 Ex Drainage Areas Ex DA-2 6S Prop DA-3 7L Prop DA-1 Wet Pond 1 P0I-1 9L Combined Prop DA-2 Wet Pond 2 P0I-2 Subcat Reach on Link Routing Diagram for Cambridge Village - HydroCAD with ODA Prepared by Bohler Engineering, Printed 10/18/2019 HydroCADO 10.00-20 s/n 08311 © 2017 HydroCAD Software Solutions LLC Cambridge Village - HydroCAD with ODA Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 2 Area Listing (all nodes) Area CN Description (acres) (subcatchment-numbers) 12.305 69 50-75% Grass cover, Fair, HSG B (1S, 2S) 8.513 61 >75% Grass cover, Good, HSG B (4S, 5S, 6S) 8.472 98 Paved parking, HSG B (1S, 2S, 4S, 5S, 6S) 29.290 75 TOTAL AREA Cambridge Village - HydroCAD with ODA Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 3 Soil Listing (all nodes) Area Soil Subcatchment (acres) Group Numbers 0.000 HSG A 29.290 HSG B 1 S, 2S, 4S, 5S, 6S 0.000 HSG C 0.000 HSG D 0.000 Other 29.290 TOTAL AREA Cambridge Village - HydroCAD with ODA Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD@ 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 4 Ground Covers (all nodes) HSG-A HSG-B HSG-C HSG-D Other Total Ground Subcatchment (acres) (acres) (acres) (acres) (acres) (acres) Cover Numbers 0.000 12.305 0.000 0.000 0.000 8.513 0.000 0.000 0.000 8.472 0.000 0.000 0.000 12.305 50-75% Grass cover, Fair 1S, 2S 0.000 8.513 >75% Grass cover, Good 4S, 5S, 6S 0.000 8.472 Paved parking 1S, 2S, 4S, 5S, 6S 0.000 29.290 0.000 0.000 0.000 29.290 TOTAL AREA Cambridge Village - HydroCAD with ODA Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 5 Pipe Listing (all nodes) Line# Node In -Invert Out -Invert Length Slope n Diam/Width Height Inside -Fill Number (feet) (feet) (feet) (ft/ft) (inches) (inches) (inches) 1 4P 788.25 787.00 250.0 0.0050 0.013 24.0 0.0 0.0 2 5P 766.70 766.29 50.0 0.0082 0.013 30.0 0.0 0.0 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 6 Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Ex DA-1 Runoff Area=6.010 ac 5.66% Impervious Runoff Depth=0.98" Flow Length=699' Tc=12.0 min CN=71 Runoff=9.90 cfs 0.492 of Subcatchment2S: Ex DA-2 Runoff Area=6.840 ac 3.00% Impervious Runoff Depth=0.93" Flow Length=790' Tc=13.1 min CN=70 Runoff=10.10 cfs 0.529 of Subcatchment4S: Prop DA-1 Runoff Area=3.130 ac 73.16% Impervious Runoff Depth=2.15" Tc=5.0 min CN=88 Runoff=14.95 cfs 0.561 of Subcatchment5S: Prop DA-2 Runoff Area=11.550 ac 45.37% Impervious Runoff Depth=1.40" Tc=5.0 min CN=78 Runoff=36.37 cfs 1.347 of Subcatchment6S: Prop DA-3 Runoff Area=1.760 ac 22.56% Impervious Runoff Depth=0.88" Tc=5.0 min CN=69 Runoff=3.30 cfs 0.129 of Pond 4P: Wet Pond 1 Peak Elev=789.75' Storage=14,787 cf Inflow=14.95 cfs 0.561 of Primary=2.64 cfs 0.517 of Secondary=0.00 cfs 0.000 of Outflow=2.64 cfs 0.517 of Pond 5P: Wet Pond 2 Peak Elev=779.09' Storage=34,216 cf Inflow=36.37 cfs 1.347 of Outflow=5.02 cfs 1.314 of Link 3L: Ex Drainage Areas Inflow=19.83 cfs 1.021 of Primary=19.83 cfs 1.021 of Link 7L: P0I-1 Inflow=3.75 cfs 0.646 of Primary=3.75 cfs 0.646 of Link 8L: P0I-2 Inflow=5.02 cfs 1.314 of Primary=5.02 cfs 1.314 of Link 9L: Combined Inflow=8.31 cfs 1.960 of Primary=8.31 cfs 1.960 of Total Runoff Area = 29.290 ac Runoff Volume = 3.058 of Average Runoff Depth = 1.25" 71.08% Pervious = 20.818 ac 28.92% Impervious = 8.472 ac Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 1S: Ex DA-1 Runoff = 9.90 cfs @ 3.27 hrs, Volume= 0.492 af, Depth= 0.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 2-yr Rainfall=3.37" Area (ac) CN Description 5.670 69 50-75% Grass cover, Fair, HSG B 0.340 98 Paved parking, HSG B 6.010 71 Weighted Average 5.670 94.34% Pervious Area 0.340 5.66% Impervious Area Tc Length Slope Velocity Capacity Description in) (feet) (ft/ft) (ft/sec) (cfs) 7.0 75 0.0400 0.18 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.6 387 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.4 237 0.0100 10.72 64.33 Channel Flow, Roadside Swale Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.022 Earth, clean & straight 12.0 699 Total Subcatchment 1S: Ex DA-1 Hydrograph 11--�i---�i--�i--i--i--i�--i�--�i---�i---�i--�i--i--i--i--i�--i�--�i---�i--�i--i--i--i`--ice-- Runoff 9.90 cfs----I-- -- - - - ---I-- -- -- - - - ---I-- -- - - - -- ha-rl-Qtt1 fir -y�r - RainfalIT3.37�.. Runbff Ai-e6=6.010 aid- 7- R� n pff Vp 14 m6=0.49� of 6 Runoff D�pthT0.98" 5 FIbw'Ldncoth=699' 4 Tp=12.0 mirl 3N=7,1-- - - T - - T - - T T - - T - - T - - T - - T - - - - - - T - - T - - T - - 2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 8 Hydrograph for Subcatchment 1S: Ex DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.58 0.00 0.00 5.00 3.22 0.89 0.70 7.50 3.37 0.98 0.00 10.00 3.37 0.98 0.00 12.50 3.37 0.98 0.00 15.00 3.37 0.98 0.00 17.50 3.37 0.98 0.00 20.00 3.37 0.98 0.00 22.50 3.37 0.98 0.00 25.00 3.37 0.98 0.00 27.50 3.37 0.98 0.00 30.00 3.37 0.98 0.00 32.50 3.37 0.98 0.00 35.00 3.37 0.98 0.00 37.50 3.37 0.98 0.00 40.00 3.37 0.98 0.00 42.50 3.37 0.98 0.00 45.00 3.37 0.98 0.00 47.50 3.37 0.98 0.00 50.00 3.37 0.98 0.00 52.50 3.37 0.98 0.00 55.00 3.37 0.98 0.00 57.50 3.37 0.98 0.00 60.00 3.37 0.98 0.00 62.50 3.37 0.98 0.00 65.00 3.37 0.98 0.00 67.50 3.37 0.98 0.00 70.00 3.37 0.98 0.00 72.50 3.37 0.98 0.00 75.00 3.37 0.98 0.00 77.50 3.37 0.98 0.00 80.00 3.37 0.98 0.00 82.50 3.37 0.98 0.00 85.00 3.37 0.98 0.00 87.50 3.37 0.98 0.00 90.00 3.37 0.98 0.00 92.50 3.37 0.98 0.00 95.00 3.37 0.98 0.00 97.50 3.37 0.98 0.00 100.00 3.37 0.98 0.00 102.50 3.37 0.98 0.00 105.00 3.37 0.98 0.00 107.50 3.37 0.98 0.00 110.00 3.37 0.98 0.00 112.50 3.37 0.98 0.00 115.00 3.37 0.98 0.00 117.50 3.37 0.98 0.00 120.00 3.37 0.98 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 9 Summary for Subcatchment 2S: Ex DA-2 Runoff = 10.10 cfs @ 3.29 hrs, Volume= 0.529 af, Depth= 0.93" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 2-yr Rainfall=3.37" Area (ac) CN Description 6.635 69 50-75% Grass cover, Fair, HSG B 0.205 98 Paved parking, HSG B 6.840 70 Weighted Average 6.635 97.00% Pervious Area 0.205 3.00% Impervious Area Tc Length Slope Velocity Capacity Description in) (feet) (ft/ft) (ft/sec) (cfs) 7.8 75 0.0300 0.16 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.8 400 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.5 315 0.0150 11.56 69.34 Channel Flow, Channel Flow Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.025 Earth, clean & winding 13.1 790 Total Subcatchment 2S: Ex DA-2 Hydrograph --I---I---I--, -- T -- r -- r----- ---I-- r -- 7 -- 7 -- T -- r --r--I-----,-- -- T -- r -- r -- ' I I I I I I I I I I I I I I I I I I I I I I ■Runoff 10.10 cfs---II-- --i-- ------------J--1--1--1--L--I -------J--1--1--L--L- ,o 0harlpttiD fir 2-y�Ir Rainfall=*.37" Runbffl Ai-e6=6.840 ad 7 RL;npfflll Vplgm'e=0.$20 c1f ---------- ----------------------+--r--r--r-----+--r--r-- Runoff IlDepthT0.93" u- 5 Flow Ldncoth=790' - -------r--r--r--r--r-------r--r--r--t--r--r--r--I lr- 3 �1 -�'r-- 4 �� M In 3 N =70 ---I---I--r--r--r--r--r--r--I--r--r--r--T--r--r--I---I--r--r--T--r--r-- 2 --I---I--�--1--L--�--1---1---1--J--1--1--L--L--L--I---I--J--�--1--L--r-- 1 I I I I I I I I I I I I I I I I I I I I I I 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 10 Hydrograph for Subcatchment 2S: Ex DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.58 0.00 0.00 5.00 3.22 0.84 0.78 7.50 3.37 0.93 0.00 10.00 3.37 0.93 0.00 12.50 3.37 0.93 0.00 15.00 3.37 0.93 0.00 17.50 3.37 0.93 0.00 20.00 3.37 0.93 0.00 22.50 3.37 0.93 0.00 25.00 3.37 0.93 0.00 27.50 3.37 0.93 0.00 30.00 3.37 0.93 0.00 32.50 3.37 0.93 0.00 35.00 3.37 0.93 0.00 37.50 3.37 0.93 0.00 40.00 3.37 0.93 0.00 42.50 3.37 0.93 0.00 45.00 3.37 0.93 0.00 47.50 3.37 0.93 0.00 50.00 3.37 0.93 0.00 52.50 3.37 0.93 0.00 55.00 3.37 0.93 0.00 57.50 3.37 0.93 0.00 60.00 3.37 0.93 0.00 62.50 3.37 0.93 0.00 65.00 3.37 0.93 0.00 67.50 3.37 0.93 0.00 70.00 3.37 0.93 0.00 72.50 3.37 0.93 0.00 75.00 3.37 0.93 0.00 77.50 3.37 0.93 0.00 80.00 3.37 0.93 0.00 82.50 3.37 0.93 0.00 85.00 3.37 0.93 0.00 87.50 3.37 0.93 0.00 90.00 3.37 0.93 0.00 92.50 3.37 0.93 0.00 95.00 3.37 0.93 0.00 97.50 3.37 0.93 0.00 100.00 3.37 0.93 0.00 102.50 3.37 0.93 0.00 105.00 3.37 0.93 0.00 107.50 3.37 0.93 0.00 110.00 3.37 0.93 0.00 112.50 3.37 0.93 0.00 115.00 3.37 0.93 0.00 117.50 3.37 0.93 0.00 120.00 3.37 0.93 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment 4S: Prop DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 14.95 cfs @ 3.15 hrs, Volume= 0.561 af, Depth= 2.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 2-yr Rainfall=3.37" Area (ac) CN Description 2.290 98 Paved parking, HSG B 0.840 61 >75% Grass cover, Good, HSG B 3.130 88 Weighted Average 0.840 26.84% Pervious Area 2.290 73.16% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, ToC Subcatchment 4S: Prop DA-1 Hydrograph --'---'�---'�---'�---'� --'� --'� --'�--'�---'�---'�---'� ---'� --'-� --'� --'�--'�---'�---'�---'� ---'� --'� --'� -- ■Runoff 14.95 cfs ---I-- --T- - -----I-- ----T--T--T--'F--I---I-- ----T--T--' -- - -- -- -- -- -- -- --+0-1 - - -Ch0, o-0-hrs-y1r- 14 _ 13 Rai nfal1#3.37'r _ -- -- ------------ -- -- -- -- --------- -- -- -- -- -- 12--------- --+-- ------------ -- -- -- rbff-Atee 1,30ad 10 4npf Vplon' =0: 6�1-cl - u 9 1 _Runoff Depth�215.. - o $ LL-------TCTS. %Ylfh-- 7 6 -- -- -- --' -- -- --+-- --' -- -- -- N=8 -- 5 4 3 +----+--+--+--+--+----------+--+--+--+--r--+--+----+--+--+--+--+-- 2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 12 Hydrograph for Subcatchment 4S: Prop DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.58 0.06 0.48 5.00 3.22 2.01 0.51 7.50 3.37 2.15 0.00 10.00 3.37 2.15 0.00 12.50 3.37 2.15 0.00 15.00 3.37 2.15 0.00 17.50 3.37 2.15 0.00 20.00 3.37 2.15 0.00 22.50 3.37 2.15 0.00 25.00 3.37 2.15 0.00 27.50 3.37 2.15 0.00 30.00 3.37 2.15 0.00 32.50 3.37 2.15 0.00 35.00 3.37 2.15 0.00 37.50 3.37 2.15 0.00 40.00 3.37 2.15 0.00 42.50 3.37 2.15 0.00 45.00 3.37 2.15 0.00 47.50 3.37 2.15 0.00 50.00 3.37 2.15 0.00 52.50 3.37 2.15 0.00 55.00 3.37 2.15 0.00 57.50 3.37 2.15 0.00 60.00 3.37 2.15 0.00 62.50 3.37 2.15 0.00 65.00 3.37 2.15 0.00 67.50 3.37 2.15 0.00 70.00 3.37 2.15 0.00 72.50 3.37 2.15 0.00 75.00 3.37 2.15 0.00 77.50 3.37 2.15 0.00 80.00 3.37 2.15 0.00 82.50 3.37 2.15 0.00 85.00 3.37 2.15 0.00 87.50 3.37 2.15 0.00 90.00 3.37 2.15 0.00 92.50 3.37 2.15 0.00 95.00 3.37 2.15 0.00 97.50 3.37 2.15 0.00 100.00 3.37 2.15 0.00 102.50 3.37 2.15 0.00 105.00 3.37 2.15 0.00 107.50 3.37 2.15 0.00 110.00 3.37 2.15 0.00 112.50 3.37 2.15 0.00 115.00 3.37 2.15 0.00 117.50 3.37 2.15 0.00 120.00 3.37 2.15 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 13 Summary for Subcatchment 5S: Prop DA-2 [49] Hint: Tc<2dt may require smaller dt Runoff = 36.37 cfs @ 3.16 hrs, Volume= 1.347 af, Depth= 1.40" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 2-yr Rainfall=3.37" Area (ac) CN Description 5.240 98 Paved parking, HSG B 6.310 61 >75% Grass cover, Good, HSG B 11.550 78 Weighted Average 6.310 54.63% Pervious Area 5.240 45.37% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Direct Entry Subcatchment 5S: Prop DA-2 Hydrograph ■ Runoff 36.37 cfs ---'----1--L-- --1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--L-- 36--------+--+--+--+----------+--+--+--+--+ - Q `e- - r - yr 34-------i-- -- -- ----------i-- -- -- --+-- ---------+-- --+-q- II'q-- -- 32------+--+--+--+--+--+-------+--+--+--+--+--+---R����J.3�'n 30------'-- -- --', --', --',-----'-- -- ---Ruhoff-Artk&l 1.550 arc - 28 ---I-- 26 -T------T--T--T--T--��--�r----T--T--• _� Y = 24----------------------------------- li-- -- -- -----eA i 1 • -- 20 18 - - -TdV- WJ�LI-- -- -- ----------- --- -- -- -- 16------'----1--L----1---1---1--J--1--1--1--L--L--1---1--J--1- Ir=� 14--- ---'----1--L----1---1---1--J--1--1--L--L--L-------J-- -- 12 --------+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+-- 10 ----- 1--+--+--+--+--+-------+--+--+--+--+--+-------+--+--+--+--+-- 8-----ti--y--rt--r--r--�r---------rt--rt--T--r--�r------------+--r--�r-- 6-- i 4----------T--T--T--T---------T--T--T--T--�+---------T--T--T--�+-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 14 Hydrograph for Subcatchment 5S: Prop DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.58 0.00 0.00 5.00 3.22 1.29 1.54 7.50 3.37 1.40 0.00 10.00 3.37 1.40 0.00 12.50 3.37 1.40 0.00 15.00 3.37 1.40 0.00 17.50 3.37 1.40 0.00 20.00 3.37 1.40 0.00 22.50 3.37 1.40 0.00 25.00 3.37 1.40 0.00 27.50 3.37 1.40 0.00 30.00 3.37 1.40 0.00 32.50 3.37 1.40 0.00 35.00 3.37 1.40 0.00 37.50 3.37 1.40 0.00 40.00 3.37 1.40 0.00 42.50 3.37 1.40 0.00 45.00 3.37 1.40 0.00 47.50 3.37 1.40 0.00 50.00 3.37 1.40 0.00 52.50 3.37 1.40 0.00 55.00 3.37 1.40 0.00 57.50 3.37 1.40 0.00 60.00 3.37 1.40 0.00 62.50 3.37 1.40 0.00 65.00 3.37 1.40 0.00 67.50 3.37 1.40 0.00 70.00 3.37 1.40 0.00 72.50 3.37 1.40 0.00 75.00 3.37 1.40 0.00 77.50 3.37 1.40 0.00 80.00 3.37 1.40 0.00 82.50 3.37 1.40 0.00 85.00 3.37 1.40 0.00 87.50 3.37 1.40 0.00 90.00 3.37 1.40 0.00 92.50 3.37 1.40 0.00 95.00 3.37 1.40 0.00 97.50 3.37 1.40 0.00 100.00 3.37 1.40 0.00 102.50 3.37 1.40 0.00 105.00 3.37 1.40 0.00 107.50 3.37 1.40 0.00 110.00 3.37 1.40 0.00 112.50 3.37 1.40 0.00 115.00 3.37 1.40 0.00 117.50 3.37 1.40 0.00 120.00 3.37 1.40 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 15 Summary for Subcatchment 6S: Prop DA-3 [49] Hint: Tc<2dt may require smaller dt Runoff = 3.30 cfs @ 3.17 hrs, Volume= 0.129 af, Depth= 0.88" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 2-yr Rainfall=3.37" Area (ac) CN Description 0.397 98 Paved parking, HSG B 1.363 61 >75% Grass cover, Good, HSG B 1.760 69 Weighted Average 1.363 77.44% Pervious Area 0.397 22.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time of Concentration Subcatchment 6S: Prop DA-3 Hydrograph � � � � � � � � � � � � � � � � � � � � � � � ❑Runoff 3.30 cfs Chrltte 0-1lr-Xr_ 3 RainfallT3.37.. RUn6ffAeea=1.760 at ��nOff',VQl�m,e=0.12$ �f 2 I I I I I I I I I I I I I I I I � I Runoff DelpthT0.88" TcT5.'0 tnih CAN=69 ------'-- -- ----------'-- -- --+-- --'----------+-- ------------ � I I I I I I I I I I I I I I I I I I I I I I 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 16 Hydrograph for Subcatchment 6S: Prop DA-3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.58 0.00 0.00 5.00 3.22 0.79 0.18 7.50 3.37 0.88 0.00 10.00 3.37 0.88 0.00 12.50 3.37 0.88 0.00 15.00 3.37 0.88 0.00 17.50 3.37 0.88 0.00 20.00 3.37 0.88 0.00 22.50 3.37 0.88 0.00 25.00 3.37 0.88 0.00 27.50 3.37 0.88 0.00 30.00 3.37 0.88 0.00 32.50 3.37 0.88 0.00 35.00 3.37 0.88 0.00 37.50 3.37 0.88 0.00 40.00 3.37 0.88 0.00 42.50 3.37 0.88 0.00 45.00 3.37 0.88 0.00 47.50 3.37 0.88 0.00 50.00 3.37 0.88 0.00 52.50 3.37 0.88 0.00 55.00 3.37 0.88 0.00 57.50 3.37 0.88 0.00 60.00 3.37 0.88 0.00 62.50 3.37 0.88 0.00 65.00 3.37 0.88 0.00 67.50 3.37 0.88 0.00 70.00 3.37 0.88 0.00 72.50 3.37 0.88 0.00 75.00 3.37 0.88 0.00 77.50 3.37 0.88 0.00 80.00 3.37 0.88 0.00 82.50 3.37 0.88 0.00 85.00 3.37 0.88 0.00 87.50 3.37 0.88 0.00 90.00 3.37 0.88 0.00 92.50 3.37 0.88 0.00 95.00 3.37 0.88 0.00 97.50 3.37 0.88 0.00 100.00 3.37 0.88 0.00 102.50 3.37 0.88 0.00 105.00 3.37 0.88 0.00 107.50 3.37 0.88 0.00 110.00 3.37 0.88 0.00 112.50 3.37 0.88 0.00 115.00 3.37 0.88 0.00 117.50 3.37 0.88 0.00 120.00 3.37 0.88 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 17 Summary for Pond 4P: Wet Pond 1 Inflow Area = 3.130 ac, 73.16% Impervious, Inflow Depth = 2.15" for 2-yr event Inflow = 14.95 cfs @ 3.15 hrs, Volume= 0.561 of Outflow = 2.64 cfs @ 3.50 hrs, Volume= 0.517 af, Atten= 82%, Lag= 21.0 min Primary = 2.64 cfs @ 3.50 hrs, Volume= 0.517 of Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 789.75' @ 3.50 hrs Surf.Area= 10,852 sf Storage= 14,787 cf Plug -Flow detention time= 1,087.5 min calculated for 0.517 of (92% of inflow) Center -of -Mass det. time= 1,080.0 min ( 1,289.7 - 209.6 ) Volume Invert Avail.Storage Storage Description #1 788.25' 42,548 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 788.25 8,900 0 0 789.00 9,858 7,034 7,034 790.00 11,185 10,522 17,556 791.00 12,500 11,843 29,398 792.00 13,800 13,150 42,548 Device Routing Invert Outlet Devices #1 Primary 788.25' 24.0" Round Culvert L= 250.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 788.25' / 787.00' S= 0.0050 T Cc= 0.900 n= 0.013, Flow Area= 3.14 sf #2 Device 1 788.25' 1.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 789.20' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 791.00' 16.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) #5 Secondary 791.50' 20.0' long x 10.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=2.64 cfs @ 3.50 hrs HW=789.75' (Free Discharge) L1=Culvert (Passes 2.64 cfs of 8.93 cfs potential flow) �2=Orifice/Grate (Orifice Controls 0.03 cfs @ 5.81 fps) 3=Orifice/Grate (Orifice Controls 2.61 cfs @ 2.38 fps) 4=S ha rp-C rested Vee/Trap Weir( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=788.25' (Free Discharge) L5= Broad -crested Rectangular Weir( Controls 0.00 cfs) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 18 '1.71 0 [! AYM '1 1i off ..... • • I 00, ,..,,. ---------------- ... . .. .--------------- Sill..:. .. .... . 792 791 789 Pond 4P: Wet Pond 1 Stage -Discharge 0 5 10 15 20 25 30 35 Discharge (cfs) Total ❑ Primary Secondary Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD® 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 19 792 791 v v c 0 790 v w 789 Pond 4P: Wet Pond 1 Stage -Area -Storage Surface/HorizontaiMetted Area (sq-ft) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 Storage (cubic -feet) S Surface ■ Storage Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 20 Hydrograph for Pond 4P: Wet Pond 1 Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 788.25 0.00 0.00 0.00 2.50 0.48 510 788.31 0.00 0.00 0.00 5.00 0.51 11,654 789.45 0.85 0.85 0.00 7.50 0.00 9,594 789.26 0.11 0.11 0.00 10.00 0.00 9,086 789.21 0.03 0.03 0.00 12.50 0.00 8,857 789.18 0.02 0.02 0.00 15.00 0.00 8,635 789.16 0.02 0.02 0.00 17.50 0.00 8,416 789.14 0.02 0.02 0.00 20.00 0.00 8,200 789.12 0.02 0.02 0.00 22.50 0.00 7,987 789.10 0.02 0.02 0.00 25.00 0.00 7,776 789.07 0.02 0.02 0.00 27.50 0.00 7,568 789.05 0.02 0.02 0.00 30.00 0.00 7,363 789.03 0.02 0.02 0.00 32.50 0.00 7,161 789.01 0.02 0.02 0.00 35.00 0.00 6,962 788.99 0.02 0.02 0.00 37.50 0.00 6,766 788.97 0.02 0.02 0.00 40.00 0.00 6,572 788.95 0.02 0.02 0.00 42.50 0.00 6,381 788.93 0.02 0.02 0.00 45.00 0.00 6,193 788.91 0.02 0.02 0.00 47.50 0.00 6,008 788.90 0.02 0.02 0.00 50.00 0.00 5,826 788.88 0.02 0.02 0.00 52.50 0.00 5,647 788.86 0.02 0.02 0.00 55.00 0.00 5,470 788.84 0.02 0.02 0.00 57.50 0.00 5,297 788.82 0.02 0.02 0.00 60.00 0.00 5,126 788.80 0.02 0.02 0.00 62.50 0.00 4,959 788.79 0.02 0.02 0.00 65.00 0.00 4,794 788.77 0.02 0.02 0.00 67.50 0.00 4,632 788.75 0.02 0.02 0.00 70.00 0.00 4,473 788.74 0.02 0.02 0.00 72.50 0.00 4,317 788.72 0.02 0.02 0.00 75.00 0.00 4,164 788.70 0.02 0.02 0.00 77.50 0.00 4,014 788.69 0.02 0.02 0.00 80.00 0.00 3,867 788.67 0.02 0.02 0.00 82.50 0.00 3,723 788.66 0.02 0.02 0.00 85.00 0.00 3,581 788.64 0.02 0.02 0.00 87.50 0.00 3,443 788.63 0.02 0.02 0.00 90.00 0.00 3,308 788.61 0.01 0.01 0.00 92.50 0.00 3,176 788.60 0.01 0.01 0.00 95.00 0.00 3,046 788.58 0.01 0.01 0.00 97.50 0.00 2,920 788.57 0.01 0.01 0.00 100.00 0.00 2,797 788.56 0.01 0.01 0.00 102.50 0.00 2,676 788.54 0.01 0.01 0.00 105.00 0.00 2,559 788.53 0.01 0.01 0.00 107.50 0.00 2,445 788.52 0.01 0.01 0.00 110.00 0.00 2,334 788.51 0.01 0.01 0.00 112.50 0.00 2,225 788.50 0.01 0.01 0.00 115.00 0.00 2,120 788.48 0.01 0.01 0.00 117.50 0.00 2,018 788.47 0.01 0.01 0.00 120.00 0.00 1,919 788.46 0.01 0.01 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 21 Summary for Pond 5P: Wet Pond 2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth = 1.40" for 2-yr event Inflow = 36.37 cfs @ 3.16 hrs, Volume= 1.347 of Outflow = 5.02 cfs @ 3.66 hrs, Volume= 1.314 af, Atten= 86%, Lag= 30.0 min Primary = 5.02 cfs @ 3.66 hrs, Volume= 1.314 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 779.09' @ 3.66 hrs Surf.Area= 16,091 sf Storage= 34,216 cf Plug -Flow detention time= 1,036.3 min calculated for 1.314 of (98% of inflow) Center -of -Mass det. time= 1,033.0 min ( 1,250.9 - 218.0 ) Volume Invert Avail.Storage Storage Description #1 776.50' 90,572 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 776.50 9,508 0 0 777.00 11,638 5,287 5,287 778.00 13,738 12,688 17,975 779.00 15,894 14,816 32,791 780.00 18,107 17,001 49,791 781.00 20,376 19,242 69,033 782.00 22,702 21,539 90,572 Device Routing Invert Outlet Devices #1 Primary 766.70' 30.0" Round Culvert L= 50.0' Ke= 0.500 Inlet / Outlet Invert= 766.70' / 766.29' S= 0.0082 T Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 776.50' 1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 778.15' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 779.50' 24.0" W x 4.0" H Vert. Orifice/Grate C= 0.600 #5 Device 1 780.75' 12.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) Primary OutFlow Max=5.02 cfs @ 3.66 hrs HW=779.09' (Free Discharge) L1=Culvert (Passes 5.02 cfs of 78.88 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.09 cfs @ 7.65 fps) 3=Orifice/Grate (Orifice Controls 4.93 cfs @ 3.70 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Sharp-Crested Vee/Trap Weir( Controls 0.00 cfs) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 22 Pond 5P: Wet Pond 2 Hydrograph 36.37 cfS J--L--L--'---'--L--L--1---1--J--1--L--1-----+-- -- -- ------- -- ------- -------------- -------L--L-- L - -'-- -- -----------------I-- ■ Inflow ■ Primary 38 ---T--T--T--Ir--li-- --T--T--1--T--+ I� flw-Are�� _ Art r -- O a� 36 --- --T--T------- --T--II -----1 T--7--I---I--T--FC--II----I--7r�--7(--�-//F�-��--yI-- 1 r 34 ------ -- ------- -- ---------- ------�pi Glev-77a.V.%, 32 30 -----------------------------I_ r�34,2n-}Q= 28 26 rt--r--r--1-----r--r--1-- + r--1---1--7--r--1---1--rt--r--r--1-- 24 --- ----r------- --r-- ---- --T-- -------T--r------- --r-- ---- 22 - - - - - - - - - - - - - 3 20 LL 18 - -J--L--L--'---'--L--L--1---1--J--1--L--1-----+--L-------L--L--L--'-- 16 - ----L------- --+------- --+-- -------+--L------- --L-- ---- 14 ---T--T--T--Ir--li-- --T--T----T--T--T--Ir--li--+--T--li---li--T--T--T--li-- 12 10 + �i-----�I--�I---�I---�I--�I--�I---�I---�I-----�I--�I---�I---�I--�I--�I---�I---�I--�I--�I---�I---�I-- 5.02cfs ---'1--'1-I---I--'1-I-I---'1--T'1-I---I--T-I---I--'1-'1---I-- w 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Pond 5P: Wet Pond 2 Stage -Discharge 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Discharge (cfs) ❑ Primary Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 23 Pond 5P: Wet Pond 2 Stage -Area -Storage Surface/HorizontaiMefted Area (sq-ft) 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 Storage (cubic -feet) ■ Surface ■ Storage Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 24 Hydrograph for Pond 5P: Wet Pond 2 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 776.50 0.00 2.50 0.00 0 776.50 0.00 5.00 1.54 27,850 778.68 2.58 7.50 0.00 21,671 778.26 0.32 10.00 0.00 20,190 778.16 0.09 12.50 0.00 19,512 778.11 0.07 15.00 0.00 18,856 778.06 0.07 17.50 0.00 18,209 778.02 0.07 20.00 0.00 17,573 777.97 0.07 22.50 0.00 16,947 777.92 0.07 25.00 0.00 16,332 777.88 0.07 27.50 0.00 15,727 777.83 0.07 30.00 0.00 15,132 777.79 0.07 32.50 0.00 14,549 777.75 0.06 35.00 0.00 13,975 777.70 0.06 37.50 0.00 13,413 777.66 0.06 40.00 0.00 12,862 777.62 0.06 42.50 0.00 12,321 777.57 0.06 45.00 0.00 11,792 777.53 0.06 47.50 0.00 11,273 777.49 0.06 50.00 0.00 10,766 777.45 0.06 52.50 0.00 10,270 777.41 0.05 55.00 0.00 9,786 777.37 0.05 57.50 0.00 9,312 777.34 0.05 60.00 0.00 8,850 777.30 0.05 62.50 0.00 8,400 777.26 0.05 65.00 0.00 7,961 777.23 0.05 67.50 0.00 7,534 777.19 0.05 70.00 0.00 7,119 777.16 0.05 72.50 0.00 6,716 777.12 0.04 75.00 0.00 6,324 777.09 0.04 77.50 0.00 5,945 777.06 0.04 80.00 0.00 5,577 777.02 0.04 82.50 0.00 5,222 776.99 0.04 85.00 0.00 4,878 776.96 0.04 87.50 0.00 4,547 776.94 0.04 90.00 0.00 4,229 776.91 0.03 92.50 0.00 3,923 776.88 0.03 95.00 0.00 3,630 776.85 0.03 97.50 0.00 3,350 776.83 0.03 100.00 0.00 3,082 776.80 0.03 102.50 0.00 2,828 776.78 0.03 105.00 0.00 2,587 776.76 0.03 107.50 0.00 2,360 776.74 0.02 110.00 0.00 2,146 776.72 0.02 112.50 0.00 1,945 776.70 0.02 115.00 0.00 1,759 776.68 0.02 117.50 0.00 1,586 776.66 0.02 120.00 0.00 1,427 776.65 0.02 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 25 Summary for Link 3L: Ex Drainage Areas Inflow Area = 12.850 ac, 4.24% Impervious, Inflow Depth = 0.95" for 2-yr event Inflow = 19.83 cfs @ 3.28 hrs, Volume= 1.021 of Primary = 19.83 cfs @ 3.28 hrs, Volume= 1.021 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 3L: Ex Drainage Areas Hydrograph ----T--T--T--li-- -li--T--T--T----T--T--T--li---li--T--T--Ir--li--T--T--T--li ■Inflow cfs ---;-- '-- ---------- -- ------'I-- --T-------;--T-------;--T- -- -------- ------- -'I-- ---------+-C�tf�Q�N-r -------------------- - -- ------',-- 4=2'A- ■ Primary 19.83 zo 19 --------------------- --------------------'--' -------'--'-----'-- 18 --- -- --------- -- ------- --+-- -------+-- ---------- -- ---- 17 -i--r--r--r--r--i--r--r--r--i--r--+--r--r--i--r--r--i---i--r--r--r--i-- 16 ----'-- --'-----'-- --' --------'--' --------'--' --'-----'-- --'-----'-- 15 -J--1--L--1---'--1--L--1---1--J--1--L--1-----+-- -------1--L--+--'-- 14 --r--r--r--r----r--r--r----r--+--r--r----r--r-------r--r--r--i-- - 13--- -',-- --',-------- --',- ------- -',-- --',-------- --',-------- --',---',---',-- N U 12 --J--1--L--1---'--1--L--1---1--J--1--L--1-----+-- -------1--L--+--'-- 3 11 i--r--r--r--r--i--r--r--r--i--r--+--r--r--i--+--r--i---i--r--r--r--i-- 0 10 ------- ' --',-----'-- --',-- ---'-- LL 9 --J--1--L--1---'--1--L--1---1--J--1--L--1-----+-- -------1--L--+--'-- 8--+--+--+--+-+--+--+--+-+--+--+--+--+-+--+--+----+--+--+--+--�-- 6 ---'--! --!-----'--! --! --------'-- + --------'-- + --!-----'--!---------- 5 - - + - - + - -I - - + - + - - + - - + - - + - + - - + - - + - - + - - + - + - - + - - + - -I- - + - - + - -I -- 4 ---- T- -T --� ----T- - T --�------T--� --�---T- -� --��-- - - T-------T- -T 3 --'--! --!-----'--! --! --------'-- + --------'-- + --!-----'--! 2 1 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 26 Hydrograph for Link 3L: Ex Drainage Areas Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 1.48 0.00 1.48 7.50 0.00 0.00 0.00 10.00 0.00 0.00 0.00 12.50 0.00 0.00 0.00 15.00 0.00 0.00 0.00 17.50 0.00 0.00 0.00 20.00 0.00 0.00 0.00 22.50 0.00 0.00 0.00 25.00 0.00 0.00 0.00 27.50 0.00 0.00 0.00 30.00 0.00 0.00 0.00 32.50 0.00 0.00 0.00 35.00 0.00 0.00 0.00 37.50 0.00 0.00 0.00 40.00 0.00 0.00 0.00 42.50 0.00 0.00 0.00 45.00 0.00 0.00 0.00 47.50 0.00 0.00 0.00 50.00 0.00 0.00 0.00 52.50 0.00 0.00 0.00 55.00 0.00 0.00 0.00 57.50 0.00 0.00 0.00 60.00 0.00 0.00 0.00 62.50 0.00 0.00 0.00 65.00 0.00 0.00 0.00 67.50 0.00 0.00 0.00 70.00 0.00 0.00 0.00 72.50 0.00 0.00 0.00 75.00 0.00 0.00 0.00 77.50 0.00 0.00 0.00 80.00 0.00 0.00 0.00 82.50 0.00 0.00 0.00 85.00 0.00 0.00 0.00 87.50 0.00 0.00 0.00 90.00 0.00 0.00 0.00 92.50 0.00 0.00 0.00 95.00 0.00 0.00 0.00 97.50 0.00 0.00 0.00 100.00 0.00 0.00 0.00 102.50 0.00 0.00 0.00 105.00 0.00 0.00 0.00 107.50 0.00 0.00 0.00 110.00 0.00 0.00 0.00 112.50 0.00 0.00 0.00 115.00 0.00 0.00 0.00 117.50 0.00 0.00 0.00 120.00 0.00 0.00 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 27 Summary for Link 7L: POI-1 Inflow Area = 4.890 ac, 54.95% Impervious, Inflow Depth > 1.58" for 2-yr event Inflow = 3.75 cfs @ 3.28 hrs, Volume= 0.646 of Primary = 3.75 cfs @ 3.28 hrs, Volume= 0.646 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 7L: POI-1 Hydrograph ---------------'--=1 ❑Inflow 3.75 cfs ❑ Primary Inflow ''IAlrea=4.890 ''lar. 3 L _ _ I_ _ _I_ _ L _ _ L _ _ L _ _I_ _ L _ _ L _ _ L _ _I_ _ L _ _ L _ _ L _ _I_ _ L _ _ L _ _ L _ _I_ _ L _ _ L _ V I I I I I I I I I I I I I I I I I I I I I I O 2 LL 1 I I I I I I I I I I I I I I I I I I I I I I 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 28 Hydrograph for Link 7L: POI-1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 1.03 0.00 1.03 7.50 0.11 0.00 0.11 10.00 0.03 0.00 0.03 12.50 0.02 0.00 0.02 15.00 0.02 0.00 0.02 17.50 0.02 0.00 0.02 20.00 0.02 0.00 0.02 22.50 0.02 0.00 0.02 25.00 0.02 0.00 0.02 27.50 0.02 0.00 0.02 30.00 0.02 0.00 0.02 32.50 0.02 0.00 0.02 35.00 0.02 0.00 0.02 37.50 0.02 0.00 0.02 40.00 0.02 0.00 0.02 42.50 0.02 0.00 0.02 45.00 0.02 0.00 0.02 47.50 0.02 0.00 0.02 50.00 0.02 0.00 0.02 52.50 0.02 0.00 0.02 55.00 0.02 0.00 0.02 57.50 0.02 0.00 0.02 60.00 0.02 0.00 0.02 62.50 0.02 0.00 0.02 65.00 0.02 0.00 0.02 67.50 0.02 0.00 0.02 70.00 0.02 0.00 0.02 72.50 0.02 0.00 0.02 75.00 0.02 0.00 0.02 77.50 0.02 0.00 0.02 80.00 0.02 0.00 0.02 82.50 0.02 0.00 0.02 85.00 0.02 0.00 0.02 87.50 0.02 0.00 0.02 90.00 0.01 0.00 0.01 92.50 0.01 0.00 0.01 95.00 0.01 0.00 0.01 97.50 0.01 0.00 0.01 100.00 0.01 0.00 0.01 102.50 0.01 0.00 0.01 105.00 0.01 0.00 0.01 107.50 0.01 0.00 0.01 110.00 0.01 0.00 0.01 112.50 0.01 0.00 0.01 115.00 0.01 0.00 0.01 117.50 0.01 0.00 0.01 120.00 0.01 0.00 0.01 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 29 Summary for Link 8L: POI-2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth > 1.37" for 2-yr event Inflow = 5.02 cfs @ 3.66 hrs, Volume= 1.314 of Primary = 5.02 cfs @ 3.66 hrs, Volume= 1.314 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 8L: POI-2 Hydrograph ❑ Inflow 502 cfs--fi--r----t--r----fi--r----7--r----fi--r-- --7-- ❑ Primary .5 Infl'low Are4=11 S$0 c, 4 N I I I I I I I I I I I I I I I I I I I I I I U 3 3 I I I I I I I I I I I I I I I I I I I I I I O LL - r--r--r--r-r--r--r----r--r--r--r-r--r--r----r--r--r--r-r--r - - 2 1 I I I I I I I I I I I I I I I I I I I I I I 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 30 Hydrograph for Link 8L: POI-2 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 2.58 0.00 2.58 7.50 0.32 0.00 0.32 10.00 0.09 0.00 0.09 12.50 0.07 0.00 0.07 15.00 0.07 0.00 0.07 17.50 0.07 0.00 0.07 20.00 0.07 0.00 0.07 22.50 0.07 0.00 0.07 25.00 0.07 0.00 0.07 27.50 0.07 0.00 0.07 30.00 0.07 0.00 0.07 32.50 0.06 0.00 0.06 35.00 0.06 0.00 0.06 37.50 0.06 0.00 0.06 40.00 0.06 0.00 0.06 42.50 0.06 0.00 0.06 45.00 0.06 0.00 0.06 47.50 0.06 0.00 0.06 50.00 0.06 0.00 0.06 52.50 0.05 0.00 0.05 55.00 0.05 0.00 0.05 57.50 0.05 0.00 0.05 60.00 0.05 0.00 0.05 62.50 0.05 0.00 0.05 65.00 0.05 0.00 0.05 67.50 0.05 0.00 0.05 70.00 0.05 0.00 0.05 72.50 0.04 0.00 0.04 75.00 0.04 0.00 0.04 77.50 0.04 0.00 0.04 80.00 0.04 0.00 0.04 82.50 0.04 0.00 0.04 85.00 0.04 0.00 0.04 87.50 0.04 0.00 0.04 90.00 0.03 0.00 0.03 92.50 0.03 0.00 0.03 95.00 0.03 0.00 0.03 97.50 0.03 0.00 0.03 100.00 0.03 0.00 0.03 102.50 0.03 0.00 0.03 105.00 0.03 0.00 0.03 107.50 0.02 0.00 0.02 110.00 0.02 0.00 0.02 112.50 0.02 0.00 0.02 115.00 0.02 0.00 0.02 117.50 0.02 0.00 0.02 120.00 0.02 0.00 0.02 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 31 Summary for Link 9L: Combined Inflow Area = 16.440 ac, 48.22% Impervious, Inflow Depth > 1.43" for 2-yr event Inflow = 8.31 cfs @ 3.54 hrs, Volume= 1.960 of Primary = 8.31 cfs @ 3.54 hrs, Volume= 1.960 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 9L: Combined Hydrograph ❑ Inflow 8.31 cfs - - ci= 4 +--+--+--+-+--+--+----+--+--; Tnfi�loyv-J4rlefiT�O�Ia - ❑ Primary 8 7 6 N U 5 I I I I I I I I I I I I I I I I I I I I I I 3 0 I I I I I I I I I I I I I I I I I I I I I I M 4 3 2 1 I I I I I I I I I I I I I I I I I I I I I I 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 2-yr Rainfall=3.37" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 32 Hydrograph for Link 9L: Combined Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 3.62 0.00 3.62 7.50 0.44 0.00 0.44 10.00 0.12 0.00 0.12 12.50 0.10 0.00 0.10 15.00 0.10 0.00 0.10 17.50 0.10 0.00 0.10 20.00 0.09 0.00 0.09 22.50 0.09 0.00 0.09 25.00 0.09 0.00 0.09 27.50 0.09 0.00 0.09 30.00 0.09 0.00 0.09 32.50 0.09 0.00 0.09 35.00 0.09 0.00 0.09 37.50 0.08 0.00 0.08 40.00 0.08 0.00 0.08 42.50 0.08 0.00 0.08 45.00 0.08 0.00 0.08 47.50 0.08 0.00 0.08 50.00 0.08 0.00 0.08 52.50 0.07 0.00 0.07 55.00 0.07 0.00 0.07 57.50 0.07 0.00 0.07 60.00 0.07 0.00 0.07 62.50 0.07 0.00 0.07 65.00 0.07 0.00 0.07 67.50 0.06 0.00 0.06 70.00 0.06 0.00 0.06 72.50 0.06 0.00 0.06 75.00 0.06 0.00 0.06 77.50 0.06 0.00 0.06 80.00 0.06 0.00 0.06 82.50 0.05 0.00 0.05 85.00 0.05 0.00 0.05 87.50 0.05 0.00 0.05 90.00 0.05 0.00 0.05 92.50 0.05 0.00 0.05 95.00 0.05 0.00 0.05 97.50 0.04 0.00 0.04 100.00 0.04 0.00 0.04 102.50 0.04 0.00 0.04 105.00 0.04 0.00 0.04 107.50 0.04 0.00 0.04 110.00 0.04 0.00 0.04 112.50 0.03 0.00 0.03 115.00 0.03 0.00 0.03 117.50 0.03 0.00 0.03 120.00 0.03 0.00 0.03 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD@ 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 33 Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Ex DA-1 Runoff Area=6.010 ac 5.66% Impervious Runoff Depth=2.06" Flow Length=699' Tc=12.0 min CN=71 Runoff=19.99 cfs 1.034 of Subcatchment2S: Ex DA-2 Runoff Area=6.840 ac 3.00% Impervious Runoff Depth=1.98" Flow Length=790' Tc=13.1 min CN=70 Runoff=21.14 cfs 1.131 of Subcatchment4S: Prop DA-1 Runoff Area=3.130 ac 73.16% Impervious Runoff Depth=3.60" Tc=5.0 min CN=88 Runoff=21.80 cfs 0.940 of Subcatchment5S: Prop DA-2 Runoff Area=11.550 ac 45.37% Impervious Runoff Depth=2.65" Tc=5.0 min CN=78 Runoff=61.48 cfs 2.553 of Subcatchment6S: Prop DA-3 Runoff Area=1.760 ac 22.56% Impervious Runoff Depth=1.91" Tc=5.0 min CN=69 Runoff=6.71 cfs 0.280 of Pond 4P: Wet Pond 1 Peak EIev=790.41' Storage=22,245 cf Inflow=21.80 cfs 0.940 of Primary=6.01 cfs 0.895 of Secondary=0.00 cfs 0.000 of Outflow=6.01 cfs 0.895 of Pond 5P: Wet Pond 2 Peak EIev=780.57' Storage=60,429 cf Inflow=61.48 cfs 2.553 of Outflow=12.42 cfs 2.520 of Link 3L: Ex Drainage Areas Inflow=41.06 cfs 2.165 of Primary=41.06 cfs 2.165 of Link 7L: P0I-1 Inflow=10.84 cfs 1.175 of Primary=10.84 cfs 1.175 of Link 8L: P0I-2 Inflow=12.42 cfs 2.520 of Primary=12.42 cfs 2.520 of Link 9L: Combined Inflow=20.60 cfs 3.695 of Primary=20.60 cfs 3.695 of Total Runoff Area = 29.290 ac Runoff Volume = 5.937 of Average Runoff Depth = 2.43" 71.08% Pervious = 20.818 ac 28.92% Impervious = 8.472 ac Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 34 Summary for Subcatchment 1S: Ex DA-1 Runoff = 19.99 cfs @ 3.26 hrs, Volume= 1.034 af, Depth= 2.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 10-yr Rainfall=4.93" Area (ac) CN Description 5.670 69 50-75% Grass cover, Fair, HSG B 0.340 98 Paved parking, HSG B 6.010 71 Weighted Average 5.670 94.34% Pervious Area 0.340 5.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 75 0.0400 0.18 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.6 387 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.4 237 0.0100 10.72 64.33 Channel Flow, Roadside Swale Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.022 Earth, clean & straight 12.0 699 Total Subcatchment 1S: Ex DA-1 Hydrograph -----�---�--�--�--�--�--�---�---�--�--�--�--�--�--�--�---�--�--�--�--�--�-- ■Runoff 19.99 cfs ---I----rt--r--r--------I----rt--rt--T--r--Ir--I---I-- ----T--r--Ir-- 20----------- --r -- --------- -- ----T--Cljado�tq,=63hr 1-04r- 18--------------------------'--'---------Ra1e1.93�L 17 r--------T--r--r--r--r------- -T - -T- r�--yr--r/--iy--7----/�7--r--yr�-- 16 --------- -- ,------------------- -- -- ftrtt) 1�-Aivct-6.V10al. 15-------- -- -- --------------- -- -- --------------- -- -- ----- 14-------- --+-- ------------ -- -- RpnpfflNpIpl mIe=1-W34 of - N 13--------,--7--r--T----------T--T--T--T--r--r--I---I--T--7-•T--r--r-- 12 - ------I-- -- - ----------I----1-- 1--Wma#'IDepth�2.p6"- ... I I I I I I I I I I I I I I 3 11 II---II---II---II---II--I�--I� --I�--II---II---II---II---II--I-I--I� - -I---I --- -- 10 ' ------I-- -- -- -- --------I-- -- -- --+---Floanr'ILdnlr�th�=699'-- 9------I-- T -- T -- r -- T --II -- - - -II- - T -- T -- T -- T -- T --Ir-------=-- ---- ------II-- LI-- LI--r--I, --I------II-- LI-- LI-- LI --I, --I, --II---III �r0-pay 7-----I----L--L------------J--L--L--L--L----1---1--J--L- L 6-----II-- -- -- ----'II------II-- -- -- --+-----'------II-- ---dN=�-- 5 4------I-- -- -- -- --------I---- -- -- -- -----------I-- -- -- --� -- I I I I I I I I I I I I I I I I I I I I I I I 3I------------L------------------L-----------------L--�-- 2-------1--+--+--r----------------+--r--r-----------+--r--r-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 35 Hydrograph for Subcatchment 1S: Ex DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.85 0.00 0.00 5.00 4.72 1.91 1.20 7.50 4.93 2.06 0.00 10.00 4.93 2.06 0.00 12.50 4.93 2.06 0.00 15.00 4.93 2.06 0.00 17.50 4.93 2.06 0.00 20.00 4.93 2.06 0.00 22.50 4.93 2.06 0.00 25.00 4.93 2.06 0.00 27.50 4.93 2.06 0.00 30.00 4.93 2.06 0.00 32.50 4.93 2.06 0.00 35.00 4.93 2.06 0.00 37.50 4.93 2.06 0.00 40.00 4.93 2.06 0.00 42.50 4.93 2.06 0.00 45.00 4.93 2.06 0.00 47.50 4.93 2.06 0.00 50.00 4.93 2.06 0.00 52.50 4.93 2.06 0.00 55.00 4.93 2.06 0.00 57.50 4.93 2.06 0.00 60.00 4.93 2.06 0.00 62.50 4.93 2.06 0.00 65.00 4.93 2.06 0.00 67.50 4.93 2.06 0.00 70.00 4.93 2.06 0.00 72.50 4.93 2.06 0.00 75.00 4.93 2.06 0.00 77.50 4.93 2.06 0.00 80.00 4.93 2.06 0.00 82.50 4.93 2.06 0.00 85.00 4.93 2.06 0.00 87.50 4.93 2.06 0.00 90.00 4.93 2.06 0.00 92.50 4.93 2.06 0.00 95.00 4.93 2.06 0.00 97.50 4.93 2.06 0.00 100.00 4.93 2.06 0.00 102.50 4.93 2.06 0.00 105.00 4.93 2.06 0.00 107.50 4.93 2.06 0.00 110.00 4.93 2.06 0.00 112.50 4.93 2.06 0.00 115.00 4.93 2.06 0.00 117.50 4.93 2.06 0.00 120.00 4.93 2.06 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 36 Summary for Subcatchment 2S: Ex DA-2 Runoff = 21.14 cfs @ 3.27 hrs, Volume= 1.131 af, Depth= 1.98" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 10-yr Rainfall=4.93" Area (ac) CN Description 6.635 69 50-75% Grass cover, Fair, HSG B 0.205 98 Paved parking, HSG B 6.840 70 Weighted Average 6.635 97.00% Pervious Area 0.205 3.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.8 75 0.0300 0.16 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.8 400 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.5 315 0.0150 11.56 69.34 Channel Flow, Channel Flow Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.025 Earth, clean & winding 13.1 790 Total Subcatchment 2S: Ex DA-2 Hydrograph I___I-- I-- I --I __I __I___I___I__-I-- I-- I--I--I __I___I___I___I-- I-- I --I _-I--- ■Runoff 21.14 cfs---II-- --i-- -- ----------J--1--1--1--L--L----- --J--1--1--L--L-- 21-------- ,-- r-- r-- r------------- ----T-- CIa-rllote,fhr 9=fir= 20 i I I i i i i 111111111 i I I i i i i i i I I �II,�� ,,IqqI 19------------+--------------'--'--+-------R�IIII��IT.L��7�7"L 18 - -- ---- T-- r - -r--I --I� - ---- T-- T-- T-- r- - + --I�--I---1 7--+--r--+-- 17 ---------- --------------------------ift rrbif-A�-e�=6.40ad-- 16 --------+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+-- 15 '------------------------------- 14 IrrQIII-tfQlt�mle=1:�1�'h-- ------------------------------------------------------------------ ^ I I I I I I I I I I I I I I Iprl I I I I I I I u13 r-------1--rt--+--r--I--------y--rt--rt--+--.���`- 12 I Runo#�IDppthTl Oil LL ------I----1--L----1---1---1--J--1--1--+--L-fOV�LF�n%=�90`- 10------I----7--+--r-------------------+--r--r-------7-- -} # 9---------II--?--II---II---II---II---II---II--?--?--I-I--II---II---II---II��-���_171��1-- 8------I-- -- --+-- --------I-- -- -- --+-- -------I-- 7---li---li----r--r--r--Ir--Ir--li-- -- -- --T--r--Ir--li---li--r--r- Nq T/ I I I I I I I I I I I I I I I I I I I I I I I s --------+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+-- 4 3--------!--! -- + --! -----------I--! --! -- + --! -----------I--! -- + --+ --I--- I I I I I I I I I I I I I I I I I I I I I I 2-------+--+--+--+----------+--+--+--+--+--+-------+--+--+--+--+-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 37 Hydrograph for Subcatchment 2S: Ex DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.85 0.00 0.00 5.00 4.72 1.83 1.35 7.50 4.93 1.98 0.00 10.00 4.93 1.98 0.00 12.50 4.93 1.98 0.00 15.00 4.93 1.98 0.00 17.50 4.93 1.98 0.00 20.00 4.93 1.98 0.00 22.50 4.93 1.98 0.00 25.00 4.93 1.98 0.00 27.50 4.93 1.98 0.00 30.00 4.93 1.98 0.00 32.50 4.93 1.98 0.00 35.00 4.93 1.98 0.00 37.50 4.93 1.98 0.00 40.00 4.93 1.98 0.00 42.50 4.93 1.98 0.00 45.00 4.93 1.98 0.00 47.50 4.93 1.98 0.00 50.00 4.93 1.98 0.00 52.50 4.93 1.98 0.00 55.00 4.93 1.98 0.00 57.50 4.93 1.98 0.00 60.00 4.93 1.98 0.00 62.50 4.93 1.98 0.00 65.00 4.93 1.98 0.00 67.50 4.93 1.98 0.00 70.00 4.93 1.98 0.00 72.50 4.93 1.98 0.00 75.00 4.93 1.98 0.00 77.50 4.93 1.98 0.00 80.00 4.93 1.98 0.00 82.50 4.93 1.98 0.00 85.00 4.93 1.98 0.00 87.50 4.93 1.98 0.00 90.00 4.93 1.98 0.00 92.50 4.93 1.98 0.00 95.00 4.93 1.98 0.00 97.50 4.93 1.98 0.00 100.00 4.93 1.98 0.00 102.50 4.93 1.98 0.00 105.00 4.93 1.98 0.00 107.50 4.93 1.98 0.00 110.00 4.93 1.98 0.00 112.50 4.93 1.98 0.00 115.00 4.93 1.98 0.00 117.50 4.93 1.98 0.00 120.00 4.93 1.98 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 38 Summary for Subcatchment 4S: Prop DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 21.80 cfs @ 3.15 hrs, Volume= 0.940 af, Depth= 3.60" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 10-yr Rainfall=4.93" Area (ac) CN Description 2.290 98 Paved parking, HSG B 0.840 61 >75% Grass cover, Good, HSG B 3.130 88 Weighted Average 0.840 26.84% Pervious Area 2.290 73.16% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, ToC Subcatchment 4S: Prop DA-1 Hydrograph ----------+--+--+--+--+--+--I--+--+--+--+--+--+--I--+--+--+--+--+--+-- ■Runoff 21.80 cfs ---;-------------;-- ------;---;---;-- 11 - -------1--L-----1---1--J--1--1--+--4arloe'hrY=yi`- 21 -i---i---i--r--r--r--r--r--r--i--r--r--r - -+-- I 19-+----+--+--+--+--+--+--+----+--+--+--+--+--+--+ 18-------;-- -- --'i --'i --'i--------;-- ----- -----y-� A--,A------/y---y-t-- 16-------'-- --i L----------J--i -pnofLVol rye=9.04� - 15 w 14 -r-------r--r--r--r--r-------r--r--r--+--rpp--r--r--I--r--**ft--=rq--r--r-- unoff 3 12 ---------+--+--+--+----------+--+--+--+--+--+-------+T-r-+--+--.+,,--y+,-- �° 11------------,--, --,--------------------,--, --,-------ly�'J.i-fllffl-- 10----------1--L----1---1---1--J--1--1--+--L--L-------J----+-w-'L-o-L-- 9 r-------r--r--r--r--r-------r--r--r--+--r--r--r----r--r- 8-- - IY�v - ------- -- --i --i --i------- -- -- -- --i --i --i------- -i 7 - - -I- - -I- - + - - + - - + - - + - - + - -I- - -I- - + - - + - - + - - +- 6 '---;---;-- it-- it --'i --'i - -'i--;---;---- 5------'----1--L----1---1---1--J--1--1--+--L--L-------J----+--L--L-- 4------'i----7--r--r--------'i-- -- -- --rt--r--'r-------7-----7--r--'r-- 3------'---- --'i --'i-----------'i-- -- -- --'i-----------'-- -- --'i --'i -- 2-----+--+--+--+--+--+--+----+--+--+--+--+--+--+----+--+--+--+--+-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 39 Hydrograph for Subcatchment 4S: Prop DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.85 0.17 1.18 5.00 4.72 3.40 0.77 7.50 4.93 3.60 0.00 10.00 4.93 3.60 0.00 12.50 4.93 3.60 0.00 15.00 4.93 3.60 0.00 17.50 4.93 3.60 0.00 20.00 4.93 3.60 0.00 22.50 4.93 3.60 0.00 25.00 4.93 3.60 0.00 27.50 4.93 3.60 0.00 30.00 4.93 3.60 0.00 32.50 4.93 3.60 0.00 35.00 4.93 3.60 0.00 37.50 4.93 3.60 0.00 40.00 4.93 3.60 0.00 42.50 4.93 3.60 0.00 45.00 4.93 3.60 0.00 47.50 4.93 3.60 0.00 50.00 4.93 3.60 0.00 52.50 4.93 3.60 0.00 55.00 4.93 3.60 0.00 57.50 4.93 3.60 0.00 60.00 4.93 3.60 0.00 62.50 4.93 3.60 0.00 65.00 4.93 3.60 0.00 67.50 4.93 3.60 0.00 70.00 4.93 3.60 0.00 72.50 4.93 3.60 0.00 75.00 4.93 3.60 0.00 77.50 4.93 3.60 0.00 80.00 4.93 3.60 0.00 82.50 4.93 3.60 0.00 85.00 4.93 3.60 0.00 87.50 4.93 3.60 0.00 90.00 4.93 3.60 0.00 92.50 4.93 3.60 0.00 95.00 4.93 3.60 0.00 97.50 4.93 3.60 0.00 100.00 4.93 3.60 0.00 102.50 4.93 3.60 0.00 105.00 4.93 3.60 0.00 107.50 4.93 3.60 0.00 110.00 4.93 3.60 0.00 112.50 4.93 3.60 0.00 115.00 4.93 3.60 0.00 117.50 4.93 3.60 0.00 120.00 4.93 3.60 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 40 Summary for Subcatchment 5S: Prop DA-2 [49] Hint: Tc<2dt may require smaller dt Runoff = 61.48 cfs @ 3.16 hrs, Volume= 2.553 af, Depth= 2.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 10-yr Rainfall=4.93" Area (ac) CN Description 5.240 98 Paved parking, HSG B 6.310 61 >75% Grass cover, Good, HSG B 11.550 78 Weighted Average 6.310 54.63% Pervious Area 5.240 45.37% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Direct Entry Subcatchment 5S: Prop DA-2 Hydrograph --I---'i---'i--y--rt--r--r--'r--'i---'i--y--rt--rt--+--r--'r--'r--'i--y--�--+--r--'r-- ❑Runoff 61.48 cfs --+--r--r -- r-- r--r--T--C- -tilaroue 6�h Tjo- yr -- -F 60 1 1 1 ----'-- -- - ---------'-- -- -- - --------------------- ------- 55-------- -- --'+ --'------------- -- --' --'----- -Rai-nfaIIT4.93 so 45---------+--+--+--+--+--+-+--+--+-- ,RR--p"Yffi~V-p1�T"'le=2.$ $ c1 40 1 1 w-----------rt--+--r------------------ t--RLmaifiD pthT.65A`- 35 M 30 �\iT5.liV lillill ---------------------------- 25 CN=78 20 �---�---�--�--1--L--�--1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--�-- 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 41 Hydrograph for Subcatchment 5S: Prop DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.85 0.03 1.32 5.00 4.72 2.48 2.50 7.50 4.93 2.65 0.00 10.00 4.93 2.65 0.00 12.50 4.93 2.65 0.00 15.00 4.93 2.65 0.00 17.50 4.93 2.65 0.00 20.00 4.93 2.65 0.00 22.50 4.93 2.65 0.00 25.00 4.93 2.65 0.00 27.50 4.93 2.65 0.00 30.00 4.93 2.65 0.00 32.50 4.93 2.65 0.00 35.00 4.93 2.65 0.00 37.50 4.93 2.65 0.00 40.00 4.93 2.65 0.00 42.50 4.93 2.65 0.00 45.00 4.93 2.65 0.00 47.50 4.93 2.65 0.00 50.00 4.93 2.65 0.00 52.50 4.93 2.65 0.00 55.00 4.93 2.65 0.00 57.50 4.93 2.65 0.00 60.00 4.93 2.65 0.00 62.50 4.93 2.65 0.00 65.00 4.93 2.65 0.00 67.50 4.93 2.65 0.00 70.00 4.93 2.65 0.00 72.50 4.93 2.65 0.00 75.00 4.93 2.65 0.00 77.50 4.93 2.65 0.00 80.00 4.93 2.65 0.00 82.50 4.93 2.65 0.00 85.00 4.93 2.65 0.00 87.50 4.93 2.65 0.00 90.00 4.93 2.65 0.00 92.50 4.93 2.65 0.00 95.00 4.93 2.65 0.00 97.50 4.93 2.65 0.00 100.00 4.93 2.65 0.00 102.50 4.93 2.65 0.00 105.00 4.93 2.65 0.00 107.50 4.93 2.65 0.00 110.00 4.93 2.65 0.00 112.50 4.93 2.65 0.00 115.00 4.93 2.65 0.00 117.50 4.93 2.65 0.00 120.00 4.93 2.65 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 42 Summary for Subcatchment 6S: Prop DA-3 [49] Hint: Tc<2dt may require smaller dt Runoff = 6.71 cfs @ 3.16 hrs, Volume= 0.280 af, Depth= 1.91" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 10-yr Rainfall=4.93" Area (ac) CN Description 0.397 98 Paved parking, HSG B 1.363 61 >75% Grass cover, Good, HSG B 1.760 69 Weighted Average 1.363 77.44% Pervious Area 0.397 22.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time of Concentration Subcatchment 6S: Prop DA-3 Hydrograph � �-'---'-- I'�-- I'� --'�--'---'---'---'-- I'� -- �� -- �I � � � � � � � � � � ❑Runoff 6.71 cfs Cf�ar,lott6 6-hr,10-y'r - - -I - - - - - - - - I- - - - - - - - - - - - - - - - - - - - - - - - - - RainfalIT4.93.. T--T------�--T--T--T--T--RLinbff�Atea=1'7-60-at- CJ I I I I I 1 RL;npff'',VQ1L;me=0.280 elf ^-r--i---i--r--r--r--r--r--i--r--r--r--r--r--r--i--r--r r--r--i---i-- Runoff DepthT1.9t -- -- -- -- --+-- -- -- --+- TGT1& - 3 PN 69 ------'----1--1--'---'---'--J--1--L--L--L----------1--L----------'-- 2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD@ 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 43 Hydrograph for Subcatchment 6S: Prop DA-3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.85 0.00 0.00 5.00 4.72 1.76 0.32 7.50 4.93 1.91 0.00 10.00 4.93 1.91 0.00 12.50 4.93 1.91 0.00 15.00 4.93 1.91 0.00 17.50 4.93 1.91 0.00 20.00 4.93 1.91 0.00 22.50 4.93 1.91 0.00 25.00 4.93 1.91 0.00 27.50 4.93 1.91 0.00 30.00 4.93 1.91 0.00 32.50 4.93 1.91 0.00 35.00 4.93 1.91 0.00 37.50 4.93 1.91 0.00 40.00 4.93 1.91 0.00 42.50 4.93 1.91 0.00 45.00 4.93 1.91 0.00 47.50 4.93 1.91 0.00 50.00 4.93 1.91 0.00 52.50 4.93 1.91 0.00 55.00 4.93 1.91 0.00 57.50 4.93 1.91 0.00 60.00 4.93 1.91 0.00 62.50 4.93 1.91 0.00 65.00 4.93 1.91 0.00 67.50 4.93 1.91 0.00 70.00 4.93 1.91 0.00 72.50 4.93 1.91 0.00 75.00 4.93 1.91 0.00 77.50 4.93 1.91 0.00 80.00 4.93 1.91 0.00 82.50 4.93 1.91 0.00 85.00 4.93 1.91 0.00 87.50 4.93 1.91 0.00 90.00 4.93 1.91 0.00 92.50 4.93 1.91 0.00 95.00 4.93 1.91 0.00 97.50 4.93 1.91 0.00 100.00 4.93 1.91 0.00 102.50 4.93 1.91 0.00 105.00 4.93 1.91 0.00 107.50 4.93 1.91 0.00 110.00 4.93 1.91 0.00 112.50 4.93 1.91 0.00 115.00 4.93 1.91 0.00 117.50 4.93 1.91 0.00 120.00 4.93 1.91 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 44 Summary for Pond 4P: Wet Pond 1 Inflow Area = 3.130 ac, 73.16% Impervious, Inflow Depth = 3.60" for 10-yr event Inflow = 21.80 cfs @ 3.15 hrs, Volume= 0.940 of Outflow = 6.01 cfs @ 3.40 hrs, Volume= 0.895 af, Atten= 72%, Lag= 15.1 min Primary = 6.01 cfs @ 3.40 hrs, Volume= 0.895 of Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 790.41' @ 3.40 hrs Surf.Area= 11,723 sf Storage= 22,245 cf Plug -Flow detention time= 645.1 min calculated for 0.895 of (95% of inflow) Center -of -Mass det. time= 641.2 min ( 846.9 - 205.7 ) Volume Invert Avail.Storage Storage Description #1 788.25' 42,548 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 788.25 8,900 0 0 789.00 9,858 7,034 7,034 790.00 11,185 10,522 17,556 791.00 12,500 11,843 29,398 792.00 13,800 13,150 42,548 Device Routing Invert Outlet Devices #1 Primary 788.25' 24.0" Round Culvert L= 250.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 788.25' / 787.00' S= 0.0050 T Cc= 0.900 n= 0.013, Flow Area= 3.14 sf #2 Device 1 788.25' 1.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 789.20' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 791.00' 16.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) #5 Secondary 791.50' 20.0' long x 10.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=6.01 cfs @ 3.40 hrs HW=790.41' (Free Discharge) L1=Culvert (Passes 6.01 cfs of 14.82 cfs potential flow) �2=Orifice/Grate (Orifice Controls 0.04 cfs @ 7.01 fps) 3=Orifice/Grate (Orifice Controls 5.97 cfs @ 4.48 fps) 4=S ha rp-C rested Vee/Trap Weir( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=788.25' (Free Discharge) L5= Broad -crested Rectangular Weir( Controls 0.00 cfs) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 45 Pond 4P: Wet Pond 1 Hydrograph ■ Inflow ■Outflow r---+-----I----�- I I 1hf1oW re-a=3A30 N Primary I I I I I I I I I I 1 ■SecondSecondary ry24 ;--;-;--;--- ; ; -1--;--1- =�-- --Peak- 49 ---' 22 20-:, ---------------------,- ' , oa=22y25c- 16 w 14 ;--;-;--;----;----;----;----;--r-;--;-;--;----;----;----;-- 0 --T---T----T----_F -1 --i-T--T-T--T-T--T----T----T----T-- M 10 --,I ----,I -- -- ---- ---- --,I - --,I - --,I ----,I ----,I ---- ---- -- 6.01 Cfs--L-J--L--1--1--1--1----1--'-- --L-1--L-J--L----L----+----1-- 6 0.00 CfS 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) 792 791 v v w c 0 R 790 v w 789 Pond 4P: Wet Pond 1 Stage -Discharge 0 5 10 15 20 25 30 35 Discharge (cfs) Total ❑ Primary Secondary Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD® 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 46 792 791 v v c 0 790 v w 789 Pond 4P: Wet Pond 1 Stage -Area -Storage Surface/HorizontaiMetted Area (sq-ft) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 Storage (cubic -feet) S Surface ■ Storage Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 47 Hydrograph for Pond 4P: Wet Pond 1 Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 788.25 0.00 0.00 0.00 2.50 1.18 1,616 788.43 0.01 0.01 0.00 5.00 0.77 12,665 789.55 1.36 1.36 0.00 7.50 0.00 9,700 789.27 0.13 0.13 0.00 10.00 0.00 9,114 789.21 0.03 0.03 0.00 12.50 0.00 8,878 789.18 0.02 0.02 0.00 15.00 0.00 8,657 789.16 0.02 0.02 0.00 17.50 0.00 8,437 789.14 0.02 0.02 0.00 20.00 0.00 8,221 789.12 0.02 0.02 0.00 22.50 0.00 8,007 789.10 0.02 0.02 0.00 25.00 0.00 7,796 789.08 0.02 0.02 0.00 27.50 0.00 7,588 789.06 0.02 0.02 0.00 30.00 0.00 7,383 789.04 0.02 0.02 0.00 32.50 0.00 7,181 789.01 0.02 0.02 0.00 35.00 0.00 6,981 788.99 0.02 0.02 0.00 37.50 0.00 6,784 788.97 0.02 0.02 0.00 40.00 0.00 6,591 788.95 0.02 0.02 0.00 42.50 0.00 6,400 788.94 0.02 0.02 0.00 45.00 0.00 6,211 788.92 0.02 0.02 0.00 47.50 0.00 6,026 788.90 0.02 0.02 0.00 50.00 0.00 5,844 788.88 0.02 0.02 0.00 52.50 0.00 5,664 788.86 0.02 0.02 0.00 55.00 0.00 5,487 788.84 0.02 0.02 0.00 57.50 0.00 5,314 788.82 0.02 0.02 0.00 60.00 0.00 5,143 788.81 0.02 0.02 0.00 62.50 0.00 4,975 788.79 0.02 0.02 0.00 65.00 0.00 4,810 788.77 0.02 0.02 0.00 67.50 0.00 4,648 788.75 0.02 0.02 0.00 70.00 0.00 4,488 788.74 0.02 0.02 0.00 72.50 0.00 4,332 788.72 0.02 0.02 0.00 75.00 0.00 4,179 788.70 0.02 0.02 0.00 77.50 0.00 4,028 788.69 0.02 0.02 0.00 80.00 0.00 3,881 788.67 0.02 0.02 0.00 82.50 0.00 3,736 788.66 0.02 0.02 0.00 85.00 0.00 3,595 788.64 0.02 0.02 0.00 87.50 0.00 3,456 788.63 0.02 0.02 0.00 90.00 0.00 3,321 788.61 0.01 0.01 0.00 92.50 0.00 3,188 788.60 0.01 0.01 0.00 95.00 0.00 3,059 788.59 0.01 0.01 0.00 97.50 0.00 2,932 788.57 0.01 0.01 0.00 100.00 0.00 2,808 788.56 0.01 0.01 0.00 102.50 0.00 2,688 788.55 0.01 0.01 0.00 105.00 0.00 2,570 788.53 0.01 0.01 0.00 107.50 0.00 2,456 788.52 0.01 0.01 0.00 110.00 0.00 2,344 788.51 0.01 0.01 0.00 112.50 0.00 2,236 788.50 0.01 0.01 0.00 115.00 0.00 2,130 788.49 0.01 0.01 0.00 117.50 0.00 2,028 788.47 0.01 0.01 0.00 120.00 0.00 1,928 788.46 0.01 0.01 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 48 Summary for Pond 5P: Wet Pond 2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth = 2.65" for 10-yr event Inflow = 61.48 cfs @ 3.16 hrs, Volume= 2.553 of Outflow = 12.42 cfs @ 3.56 hrs, Volume= 2.520 af, Atten= 80%, Lag= 24.2 min Primary = 12.42 cfs @ 3.56 hrs, Volume= 2.520 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 780.57' @ 3.56 hrs Surf.Area= 19,394 sf Storage= 60,429 cf Plug -Flow detention time= 568.0 min calculated for 2.519 of (99% of inflow) Center -of -Mass det. time= 568.7 min ( 781.7 - 212.9 ) Volume Invert Avail.Storage Storage Description #1 776.50' 90,572 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 776.50 9,508 0 0 777.00 11,638 5,287 5,287 778.00 13,738 12,688 17,975 779.00 15,894 14,816 32,791 780.00 18,107 17,001 49,791 781.00 20,376 19,242 69,033 782.00 22,702 21,539 90,572 Device Routing Invert Outlet Devices #1 Primary 766.70' 30.0" Round Culvert L= 50.0' Ke= 0.500 Inlet / Outlet Invert= 766.70' / 766.29' S= 0.0082 T Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 776.50' 1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 778.15' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 779.50' 24.0" W x 4.0" H Vert. Orifice/Grate C= 0.600 #5 Device 1 780.75' 12.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) Primary OutFlow Max=12.41 cfs @ 3.56 hrs HW=780.57' (Free Discharge) L1=Culvert (Passes 12.41 cfs of 83.95 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.12 cfs @ 9.63 fps) 3=Orifice/Grate (Orifice Controls 9.26 cfs @ 6.94 fps) 4=Orifice/Grate (Orifice Controls 3.04 cfs @ 4.56 fps) 5=Sharp-Crested Vee/Trap Weir( Controls 0.00 cfs) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 49 Pond 5P: Wet Pond 2 Hydrograph ---- ----r--li---li----r-----li----rt--Ir--li---li--7--r--li---li----r--Ir--li-- ■ Inflow 61.48 CfS ■ Primary 60---J--1--L--'-----1--L--'---'--J--I-InfMow ArL6a=l-1s560-� La 55 --- -- --! -- --! -- --! --' -- Peak! Elea=7$0.€�- 50----i-- li--i-----i-- li--i --i--i---i - - 8tora 9 cf =60742 45----II-- I'i--'i-----II-- I'i--li --'i- --------'i---------'i---------'i --'i --'i-- N 40 --- --'--------- --------- - - - + ---------+------ - - - - -- -- ---- U �- 35 ---r--r--r--r--I--r--r--r--I--r--t--r--r--I--r--r--I---I--r--r--r--I-- 3 0 M 30 I I I I I I I I I I I I I I I I I I I I I I I 25---J--1--L--1---�--1--L--1---1--J--1--L--1---�--1--L--1---�--1--L--�--�-- I I I I I I I I I I I I I I I I I I I I I I 20 --+--+--r-------+--+-------+--+--+-------+--+-------+--r--+--I-- I I I I I I I I I I I I I I I I I I I I I I 12.42 JIS---r-----I-- --r- --'I-- --T--'-------T-------'I-- --r--' --'I-- 10 w 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Pond 5P: Wet Pond 2 Stage -Discharge 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Discharge (cfs) ❑ Primary Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 50 Pond 5P: Wet Pond 2 Stage -Area -Storage Surface/HorizontaiMefted Area (sq-ft) 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 Storage (cubic -feet) ■ Surface ■ Storage Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 51 Hydrograph for Pond 5P: Wet Pond 2 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 776.50 0.00 2.50 1.32 722 776.57 0.01 5.00 2.50 38,103 779.33 5.95 7.50 0.00 22,297 778.31 0.48 10.00 0.00 20,342 778.17 0.11 12.50 0.00 19,628 778.12 0.07 15.00 0.00 18,970 778.07 0.07 17.50 0.00 18,321 778.03 0.07 20.00 0.00 17,683 777.98 0.07 22.50 0.00 17,056 777.93 0.07 25.00 0.00 16,438 777.89 0.07 27.50 0.00 15,832 777.84 0.07 30.00 0.00 15,235 777.80 0.07 32.50 0.00 14,650 777.75 0.06 35.00 0.00 14,075 777.71 0.06 37.50 0.00 13,511 777.67 0.06 40.00 0.00 12,957 777.62 0.06 42.50 0.00 12,415 777.58 0.06 45.00 0.00 11,884 777.54 0.06 47.50 0.00 11,363 777.50 0.06 50.00 0.00 10,854 777.46 0.06 52.50 0.00 10,356 777.42 0.05 55.00 0.00 9,869 777.38 0.05 57.50 0.00 9,394 777.34 0.05 60.00 0.00 8,930 777.30 0.05 62.50 0.00 8,478 777.27 0.05 65.00 0.00 8,037 777.23 0.05 67.50 0.00 7,608 777.20 0.05 70.00 0.00 7,191 777.16 0.05 72.50 0.00 6,785 777.13 0.04 75.00 0.00 6,392 777.09 0.04 77.50 0.00 6,010 777.06 0.04 80.00 0.00 5,640 777.03 0.04 82.50 0.00 5,283 777.00 0.04 85.00 0.00 4,937 776.97 0.04 87.50 0.00 4,604 776.94 0.04 90.00 0.00 4,284 776.91 0.03 92.50 0.00 3,976 776.88 0.03 95.00 0.00 3,680 776.86 0.03 97.50 0.00 3,398 776.83 0.03 100.00 0.00 3,128 776.81 0.03 102.50 0.00 2,872 776.78 0.03 105.00 0.00 2,628 776.76 0.03 107.50 0.00 2,399 776.74 0.02 110.00 0.00 2,182 776.72 0.02 112.50 0.00 1,979 776.70 0.02 115.00 0.00 1,791 776.68 0.02 117.50 0.00 1,615 776.66 0.02 120.00 0.00 1,454 776.65 0.02 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 52 Summary for Link 3L: Ex Drainage Areas Inflow Area = 12.850 ac, 4.24% Impervious, Inflow Depth = 2.02" for 10-yr event Inflow = 41.06 cfs @ 3.26 hrs, Volume= 2.165 of Primary = 41.06 cfs @ 3.26 hrs, Volume= 2.165 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 3L: Ex Drainage Areas Hydrograph ■ Inflow ---------T--+------+--+------+--+--+-+--+--T---------T--+--i-- I Al ins 41.06 cfs ' ice i ■ Primary 40 --r--r--r--i- -r- -r--r--i--r--+--r-- r--i--r--r--i---i- -r--r--r--i-- Til 36 --+--+--+-+--+--+--+-+--+--+--+--+-+--+--+----+--+--+--+-+-- 34 --- -- --T--�----- --T-- ---- --T-- -----�--T--T--�---�--T--T--F---- 11 ---------- 30 --+--+--r--+----+--+--+----+--+--+--+-+--+--+-------+--r--+--i-- 28 -----?--', -----',-- --', --------',-- --',-----',-- --',-------?--', --', --',-- w26 --J--1--L--1---'-- --L-------J--+--L-------+-- -------1--L--L--'-- - 24 i--r--r--r--r--i-- r- -r-- r --i--r--+--r--r--i--r--r--i---i--r--r--r--i-- 0 22 ---'-- -- -----'-- -- --------'-- + --------'-- + -------'-- -------'-- M 20 --+--+--+--+-+--+--+--+-+--+--+--+--+-+--+--+----+--+--+--+-+-- 18 ---',-- --', -----',-- --', --------',-- --',-----',-- --',-----',-- --', --', --',-- 14 --+--+--r--+----+--+--+----+--+--+--+-+--+--+-------+--r--+--i-- 12 ----- ?-- ------'-- --r 10 -- -- -- ------- -- ------- --+-- -------+--------- -- -- ---- 8 --r--r--r--r----r--r--r----r--+--r--r----r--r-------r--r--r--i-- 6 --'---'--'---'---'---'--'---'---'---'--'---'----------------------------'-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 53 Hydrograph for Link 3L: Ex Drainage Areas Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 2.55 0.00 2.55 7.50 0.00 0.00 0.00 10.00 0.00 0.00 0.00 12.50 0.00 0.00 0.00 15.00 0.00 0.00 0.00 17.50 0.00 0.00 0.00 20.00 0.00 0.00 0.00 22.50 0.00 0.00 0.00 25.00 0.00 0.00 0.00 27.50 0.00 0.00 0.00 30.00 0.00 0.00 0.00 32.50 0.00 0.00 0.00 35.00 0.00 0.00 0.00 37.50 0.00 0.00 0.00 40.00 0.00 0.00 0.00 42.50 0.00 0.00 0.00 45.00 0.00 0.00 0.00 47.50 0.00 0.00 0.00 50.00 0.00 0.00 0.00 52.50 0.00 0.00 0.00 55.00 0.00 0.00 0.00 57.50 0.00 0.00 0.00 60.00 0.00 0.00 0.00 62.50 0.00 0.00 0.00 65.00 0.00 0.00 0.00 67.50 0.00 0.00 0.00 70.00 0.00 0.00 0.00 72.50 0.00 0.00 0.00 75.00 0.00 0.00 0.00 77.50 0.00 0.00 0.00 80.00 0.00 0.00 0.00 82.50 0.00 0.00 0.00 85.00 0.00 0.00 0.00 87.50 0.00 0.00 0.00 90.00 0.00 0.00 0.00 92.50 0.00 0.00 0.00 95.00 0.00 0.00 0.00 97.50 0.00 0.00 0.00 100.00 0.00 0.00 0.00 102.50 0.00 0.00 0.00 105.00 0.00 0.00 0.00 107.50 0.00 0.00 0.00 110.00 0.00 0.00 0.00 112.50 0.00 0.00 0.00 115.00 0.00 0.00 0.00 117.50 0.00 0.00 0.00 120.00 0.00 0.00 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 54 Summary for Link 7L: POI-1 Inflow Area = 4.890 ac, 54.95% Impervious, Inflow Depth > 2.88" for 10-yr event Inflow = 10.84 cfs @ 3.20 hrs, Volume= 1.175 of Primary = 10.84 cfs @ 3.20 hrs, Volume= 1.175 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 7L: POI-1 Hydrograph ------- � -- L I--�---�-- � -- I--�I--�---I-- � --II--�---�-- � --I--�---�--- II --II --�-- ❑owInfl - - - - IL - - - - - - - L - - I L - -1- - -1- - J - - 1 - - L - -1- - - - - 1 - - IL - - - - -I. L - - IL ❑ Primary 10.84 cfs---II--------II-------------II-- a'Inf[Gw I'1Are' 14.890 'lac - 10--------li---------li --li-----Ii-- --i g-------li---------li --li-----Ii-- --li 8-------li---------li --li-----Ii-- --li N 7-------I,---------I, --I,-----Ii-- --li U 3 6 p I I I I I I I I I I I I I I I I I I I I I I LL 5 -- ----r-----I-- --r-- --I-- --+--r-------+--r-------7--r--r--I-- 4 --r--r--r-------r--r--r----r--r--r-------r--r-------r--r--r-- I-- 3- 2 -+--+--r-------+--+-------+--+--+-------+--+-------+--r--+--I-- 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 55 Hydrograph for Link 7L: POI-1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.01 0.00 0.01 5.00 1.69 0.00 1.69 7.50 0.13 0.00 0.13 10.00 0.03 0.00 0.03 12.50 0.02 0.00 0.02 15.00 0.02 0.00 0.02 17.50 0.02 0.00 0.02 20.00 0.02 0.00 0.02 22.50 0.02 0.00 0.02 25.00 0.02 0.00 0.02 27.50 0.02 0.00 0.02 30.00 0.02 0.00 0.02 32.50 0.02 0.00 0.02 35.00 0.02 0.00 0.02 37.50 0.02 0.00 0.02 40.00 0.02 0.00 0.02 42.50 0.02 0.00 0.02 45.00 0.02 0.00 0.02 47.50 0.02 0.00 0.02 50.00 0.02 0.00 0.02 52.50 0.02 0.00 0.02 55.00 0.02 0.00 0.02 57.50 0.02 0.00 0.02 60.00 0.02 0.00 0.02 62.50 0.02 0.00 0.02 65.00 0.02 0.00 0.02 67.50 0.02 0.00 0.02 70.00 0.02 0.00 0.02 72.50 0.02 0.00 0.02 75.00 0.02 0.00 0.02 77.50 0.02 0.00 0.02 80.00 0.02 0.00 0.02 82.50 0.02 0.00 0.02 85.00 0.02 0.00 0.02 87.50 0.02 0.00 0.02 90.00 0.01 0.00 0.01 92.50 0.01 0.00 0.01 95.00 0.01 0.00 0.01 97.50 0.01 0.00 0.01 100.00 0.01 0.00 0.01 102.50 0.01 0.00 0.01 105.00 0.01 0.00 0.01 107.50 0.01 0.00 0.01 110.00 0.01 0.00 0.01 112.50 0.01 0.00 0.01 115.00 0.01 0.00 0.01 117.50 0.01 0.00 0.01 120.00 0.01 0.00 0.01 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 56 Summary for Link 8L: POI-2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth > 2.62" for 10-yr event Inflow = 12.42 cfs @ 3.56 hrs, Volume= 2.520 of Primary = 12.42 cfs @ 3.56 hrs, Volume= 2.520 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 8L: POI-2 Hydrograph XF -- --------- --------- -- --------- --------- -- -- ---- ❑Inflow 12.42 cfs - � � � � � � � � � -� ❑Primary 12----i --i --i-- i--i -_i 10 ----rt--r--r------- +--r--i-- --+--r--r----7--r----------r--r--i-- 9 i --J--1--L--1---'-- --L--'---'--J--L--L-------1--L--1-----1--L--L--'-- w U 0 ---------- 4 -+--+--r--+--i--+--+--+--i--+--+--+--+-+--+--+--i---i--+--r--+--i-- 2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 57 Hydrograph for Link 8L: POI-2 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.01 0.00 0.01 5.00 5.95 0.00 5.95 7.50 0.48 0.00 0.48 10.00 0.11 0.00 0.11 12.50 0.07 0.00 0.07 15.00 0.07 0.00 0.07 17.50 0.07 0.00 0.07 20.00 0.07 0.00 0.07 22.50 0.07 0.00 0.07 25.00 0.07 0.00 0.07 27.50 0.07 0.00 0.07 30.00 0.07 0.00 0.07 32.50 0.06 0.00 0.06 35.00 0.06 0.00 0.06 37.50 0.06 0.00 0.06 40.00 0.06 0.00 0.06 42.50 0.06 0.00 0.06 45.00 0.06 0.00 0.06 47.50 0.06 0.00 0.06 50.00 0.06 0.00 0.06 52.50 0.05 0.00 0.05 55.00 0.05 0.00 0.05 57.50 0.05 0.00 0.05 60.00 0.05 0.00 0.05 62.50 0.05 0.00 0.05 65.00 0.05 0.00 0.05 67.50 0.05 0.00 0.05 70.00 0.05 0.00 0.05 72.50 0.04 0.00 0.04 75.00 0.04 0.00 0.04 77.50 0.04 0.00 0.04 80.00 0.04 0.00 0.04 82.50 0.04 0.00 0.04 85.00 0.04 0.00 0.04 87.50 0.04 0.00 0.04 90.00 0.03 0.00 0.03 92.50 0.03 0.00 0.03 95.00 0.03 0.00 0.03 97.50 0.03 0.00 0.03 100.00 0.03 0.00 0.03 102.50 0.03 0.00 0.03 105.00 0.03 0.00 0.03 107.50 0.02 0.00 0.02 110.00 0.02 0.00 0.02 112.50 0.02 0.00 0.02 115.00 0.02 0.00 0.02 117.50 0.02 0.00 0.02 120.00 0.02 0.00 0.02 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 58 Summary for Link 9L: Combined Inflow Area = 16.440 ac, 48.22% Impervious, Inflow Depth > 2.70" for 10-yr event Inflow = 20.60 cfs @ 3.32 hrs, Volume= 3.695 of Primary = 20.60 cfs @ 3.32 hrs, Volume= 3.695 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 9L: Combined Hydrograph --i--r--r--r--r--i-r--r--r--i--r--+--r--r--i--r--r--i---i--r--r--r--i-- ,� ---- -- --'� --'� -T --'� --'� ---- -- --'� --'� --'�-- --'�------- --'� --'� --'�-- ■Inflow 2rfs rn---------------------+---------+---------------�-- cfs ----- - -- --r-------;--r------- ---------- -----------'�- --T-�- - - - +-- - I_ �� Q'�-I-- - w-� e ar T p- ■Primary 20.60 20 --+--+--r--+----+--+--+----+--+--+--+-+--+--+-------+--r--+--i-- 19 -- -,-- --------,-- ---------- -,-- --------,----------,----------,-- 18 -- -- --------- -- ------- -- --------- --------- -- -- ---- 17 -- -- --r------- --r-- ---- --T-- -------T--r------- --r-- ---- 16 ------'--' --------'--' ----------------------'--' --------'--'-----'-- 15 -- -- --------- -- ------- --+-- -------+--------- -- -- ---- 14 ---,-- --,-----,-- --, --------,-- --,-----,-- --,-----,-- --, --, --,-- w 13 --J--1--L--1---'-- --L--'---'--J--L--L-------1--L--1-----1--L--L--'-- — 12 i--r--r--r--r--i--r--r--r--i--r--+--r--r--i--r--r--i---i--r--r--r--i-- 11 '---'---'--'---'---'-- 1--'---'---'---'--'---'---'---'---'--'---'---'---'--'---'---'-- UZ: 10 -- -- --------- -- ------- -- --------- --------- -- -- ---- 9 -- -- --r------- --r-- ---- --T-- -------T--r------- --r-- ---- ---------- 7 -+--+--r--+----+--+--+----+--+--+--+-+--+--+-------+--r--+--i-- 6 ----?--------',-- -----------',-- --------',-- --',---',---',--?--',---',---',-- 5 - -- --------- -- ------- -- --------- --------- -- -- ---- 4 -r--r--r--r----r--r--r----r--+--r--r----r--r-------r--r--r--i-- 3 --'---'--'---'---'---'--'---'---'---'--'---'----------------------------'-- 2 1 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 10-yr Rainfall=4.93" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 59 Hydrograph for Link 9L: Combined Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.02 0.00 0.02 5.00 7.64 0.00 7.64 7.50 0.62 0.00 0.62 10.00 0.14 0.00 0.14 12.50 0.10 0.00 0.10 15.00 0.10 0.00 0.10 17.50 0.10 0.00 0.10 20.00 0.09 0.00 0.09 22.50 0.09 0.00 0.09 25.00 0.09 0.00 0.09 27.50 0.09 0.00 0.09 30.00 0.09 0.00 0.09 32.50 0.09 0.00 0.09 35.00 0.09 0.00 0.09 37.50 0.08 0.00 0.08 40.00 0.08 0.00 0.08 42.50 0.08 0.00 0.08 45.00 0.08 0.00 0.08 47.50 0.08 0.00 0.08 50.00 0.08 0.00 0.08 52.50 0.07 0.00 0.07 55.00 0.07 0.00 0.07 57.50 0.07 0.00 0.07 60.00 0.07 0.00 0.07 62.50 0.07 0.00 0.07 65.00 0.07 0.00 0.07 67.50 0.06 0.00 0.06 70.00 0.06 0.00 0.06 72.50 0.06 0.00 0.06 75.00 0.06 0.00 0.06 77.50 0.06 0.00 0.06 80.00 0.06 0.00 0.06 82.50 0.05 0.00 0.05 85.00 0.05 0.00 0.05 87.50 0.05 0.00 0.05 90.00 0.05 0.00 0.05 92.50 0.05 0.00 0.05 95.00 0.05 0.00 0.05 97.50 0.04 0.00 0.04 100.00 0.04 0.00 0.04 102.50 0.04 0.00 0.04 105.00 0.04 0.00 0.04 107.50 0.04 0.00 0.04 110.00 0.04 0.00 0.04 112.50 0.03 0.00 0.03 115.00 0.03 0.00 0.03 117.50 0.03 0.00 0.03 120.00 0.03 0.00 0.03 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD@ 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 60 Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Ex DA-1 Runoff Area=6.010 ac 5.66% Impervious Runoff Depth=2.79" Flow Length=699' Tc=12.0 min CN=71 Runoff=26.73 cfs 1.396 of Subcatchment2S: Ex DA-2 Runoff Area=6.840 ac 3.00% Impervious Runoff Depth=2.69" Flow Length=790' Tc=13.1 min CN=70 Runoff=28.52 cfs 1.536 of Subcatchment4S: Prop DA-1 Runoff Area=3.130 ac 73.16% Impervious Runoff Depth=4.49" Tc=5.0 min CN=88 Runoff=26.38 cfs 1.171 of Subcatchment5S: Prop DA-2 Runoff Area=11.550 ac 45.37% Impervious Runoff Depth=3.46" Tc=5.0 min CN=78 Runoff=78.26 cfs 3.326 of Subcatchment6S: Prop DA-3 Runoff Area=1.760 ac 22.56% Impervious Runoff Depth=2.60" Tc=5.0 min CN=69 Runoff=9.05 cfs 0.382 of Pond 4P: Wet Pond 1 Peak EIev=790.83' Storage=27,242 cf Inflow=26.38 cfs 1.171 of Primary=7.32 cfs 1.127 of Secondary=0.00 cfs 0.000 of Outflow=7.32 cfs 1.127 of Pond 5P: Wet Pond 2 Peak EIev=781.18' Storage=72,693 cf Inflow=78.26 cfs 3.326 of Outflow=25.60 cfs 3.292 of Link 3L: Ex Drainage Areas Inflow=55.16 cfs 2.931 of Primary=55.16 cfs 2.931 of Link 7L: P0I-1 Inflow=14.43 cfs 1.509 of Primary=14.43 cfs 1.509 of Link 8L: P0I-2 Inflow=25.60 cfs 3.292 of Primary=25.60 cfs 3.292 of Link 9L: Combined Inflow=36.40 cfs 4.801 of Primary=36.40 cfs 4.801 of Total Runoff Area = 29.290 ac Runoff Volume = 7.811 of Average Runoff Depth = 3.20" 71.08% Pervious = 20.818 ac 28.92% Impervious = 8.472 ac Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 61 Summary for Subcatchment 1S: Ex DA-1 Runoff = 26.73 cfs @ 3.25 hrs, Volume= 1.396 af, Depth= 2.79" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 25-yr Rainfall=5.86" Area (ac) CN Description 5.670 69 50-75% Grass cover, Fair, HSG B 0.340 98 Paved parking, HSG B 6.010 71 Weighted Average 5.670 94.34% Pervious Area 0.340 5.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 75 0.0400 0.18 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.6 387 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.4 237 0.0100 10.72 64.33 Channel Flow, Roadside Swale Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.022 Earth, clean & straight 12.0 699 Total Subcatchment 1S: Ex DA-1 Hydrograph � �---'--�--1--L--�--1---1---1--J--1--1--+--L--+--'---'--J--1--+--+--�-- ■Runoff 26.73 cfs 26 --_-�-_-�--�--rt--+--r--�--�-=-�--�-_-�--�--�--rt--rt--+--Chrarlotte, 6�hr�,2�-y�;r _ �- -�- -�--- -- --� -- -- -- --- -- -- -- --------- 24 22 -- ,-- r T- - -- -- -- -- R-unb#f Allrea=6.010-ad 20- ----------1--L------------J--1-- C i�nQ�f;p LVl m;e=1: 9 - 18 16 ' Runoff DepthT2.79" 0 14 Flow Ldnhfh=699v 12- -- - - - - -- -- - - ,I - - ,I --,I ---------- -- -- --,I --,I -----; q-- 2.-0 mfn-- 10 ---1--L----1---1---1--J--1--1--+--L--+-----'-- -- + r-------y--rt--+--r--r-------y--rt--rt--+--r--r--r----y----+--r--r-- 6 4 -+--+--+--+--+--+--+--+-+--+--+--+--+--+--+--+-+--+--+--+--+--+-- 2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 62 Hydrograph for Subcatchment 1S: Ex DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 1.04 0.01 0.16 5.00 5.60 2.58 1.60 7.50 5.86 2.79 0.00 10.00 5.86 2.79 0.00 12.50 5.86 2.79 0.00 15.00 5.86 2.79 0.00 17.50 5.86 2.79 0.00 20.00 5.86 2.79 0.00 22.50 5.86 2.79 0.00 25.00 5.86 2.79 0.00 27.50 5.86 2.79 0.00 30.00 5.86 2.79 0.00 32.50 5.86 2.79 0.00 35.00 5.86 2.79 0.00 37.50 5.86 2.79 0.00 40.00 5.86 2.79 0.00 42.50 5.86 2.79 0.00 45.00 5.86 2.79 0.00 47.50 5.86 2.79 0.00 50.00 5.86 2.79 0.00 52.50 5.86 2.79 0.00 55.00 5.86 2.79 0.00 57.50 5.86 2.79 0.00 60.00 5.86 2.79 0.00 62.50 5.86 2.79 0.00 65.00 5.86 2.79 0.00 67.50 5.86 2.79 0.00 70.00 5.86 2.79 0.00 72.50 5.86 2.79 0.00 75.00 5.86 2.79 0.00 77.50 5.86 2.79 0.00 80.00 5.86 2.79 0.00 82.50 5.86 2.79 0.00 85.00 5.86 2.79 0.00 87.50 5.86 2.79 0.00 90.00 5.86 2.79 0.00 92.50 5.86 2.79 0.00 95.00 5.86 2.79 0.00 97.50 5.86 2.79 0.00 100.00 5.86 2.79 0.00 102.50 5.86 2.79 0.00 105.00 5.86 2.79 0.00 107.50 5.86 2.79 0.00 110.00 5.86 2.79 0.00 112.50 5.86 2.79 0.00 115.00 5.86 2.79 0.00 117.50 5.86 2.79 0.00 120.00 5.86 2.79 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 63 Summary for Subcatchment 2S: Ex DA-2 Runoff = 28.52 cfs @ 3.27 hrs, Volume= 1.536 af, Depth= 2.69" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 25-yr Rainfall=5.86" Area (ac) CN Description 6.635 69 50-75% Grass cover, Fair, HSG B 0.205 98 Paved parking, HSG B 6.840 70 Weighted Average 6.635 97.00% Pervious Area 0.205 3.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.8 75 0.0300 0.16 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.8 400 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.5 315 0.0150 11.56 69.34 Channel Flow, Channel Flow Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.025 Earth, clean & winding 13.1 790 Total Subcatchment 2S: Ex DA-2 Hydrograph -----�---�--�--�--+--�--�---�---�--�--�--�--+--�--�--�---�--�--�--+--+--�-- ■Runoff 28.52 cfs 28----------+--+-----'--------------I--+--Qljarlo(te 6l r+2-$-fir 26 24 --rt--r--r----rt--rt--wnitf-Abed ad-- 22---------L--L-----------------+----+-----------+--+--+-- 20 - - npff7Vp1µme I $-O - u 18-------- -- --+------------ -- -- --+- 1-- Rt� roof# IDepth=TZ.697 3 16 I I I I LL 14 +-+--+--+--+--+--+--+--+-+--+--+--+--+--+--+--+---T-+----+--+--+-- 12----------+-- --F -- --I --- I---------+-- -------'-F=�'�-�- 10 I I I I I I I I I I I I I I I I I I +-------+--+--+--r----------+--+--+--+--r--+--+----+--+- w� 7� 8 I I I I I I I I I I I I I I I I I I I 1� ------------------------------------- 6 I---I---I--7--7--7--7--I ---------7--7--T--7--7-------7----T--T--F-- 4 -----I-- -- L --+-- L-----I---I-- L -- L -- L --+-- L --L--I - - - I-- L----+--+-- L -- 2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 64 Hydrograph for Subcatchment 2S: Ex DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 1.04 0.01 0.08 5.00 5.60 2.49 1.80 7.50 5.86 2.69 0.00 10.00 5.86 2.69 0.00 12.50 5.86 2.69 0.00 15.00 5.86 2.69 0.00 17.50 5.86 2.69 0.00 20.00 5.86 2.69 0.00 22.50 5.86 2.69 0.00 25.00 5.86 2.69 0.00 27.50 5.86 2.69 0.00 30.00 5.86 2.69 0.00 32.50 5.86 2.69 0.00 35.00 5.86 2.69 0.00 37.50 5.86 2.69 0.00 40.00 5.86 2.69 0.00 42.50 5.86 2.69 0.00 45.00 5.86 2.69 0.00 47.50 5.86 2.69 0.00 50.00 5.86 2.69 0.00 52.50 5.86 2.69 0.00 55.00 5.86 2.69 0.00 57.50 5.86 2.69 0.00 60.00 5.86 2.69 0.00 62.50 5.86 2.69 0.00 65.00 5.86 2.69 0.00 67.50 5.86 2.69 0.00 70.00 5.86 2.69 0.00 72.50 5.86 2.69 0.00 75.00 5.86 2.69 0.00 77.50 5.86 2.69 0.00 80.00 5.86 2.69 0.00 82.50 5.86 2.69 0.00 85.00 5.86 2.69 0.00 87.50 5.86 2.69 0.00 90.00 5.86 2.69 0.00 92.50 5.86 2.69 0.00 95.00 5.86 2.69 0.00 97.50 5.86 2.69 0.00 100.00 5.86 2.69 0.00 102.50 5.86 2.69 0.00 105.00 5.86 2.69 0.00 107.50 5.86 2.69 0.00 110.00 5.86 2.69 0.00 112.50 5.86 2.69 0.00 115.00 5.86 2.69 0.00 117.50 5.86 2.69 0.00 120.00 5.86 2.69 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 65 Summary for Subcatchment 4S: Prop DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 26.38 cfs @ 3.15 hrs, Volume= 1.171 af, Depth= 4.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 25-yr Rainfall=5.86" Area (ac) CN Description 2.290 98 Paved parking, HSG B 0.840 61 >75% Grass cover, Good, HSG B 3.130 88 Weighted Average 0.840 26.84% Pervious Area 2.290 73.16% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, ToC Subcatchment 4S: Prop DA-1 Hydrograph ----------- ----T--r--------'- ---T-- T--T-- T-- 'r--- - -' -- ----T--T--T- - ■Runoff 26.38 cfs 26 C11 1 otte' 6 ,hr 2 -y, - -I- - + - - + - I- + - + - + - 24 pp p ',nr --------- l�cNl�`1f1 -r r -- -------------- -- --+-- ----r1�5.86- 22- ThIlry6ff-Area-1130ad-- 20 I I I I I I I I I 1 ---+--t--r----rt--'R�nOffrVpl�me=1.171-af - 18 ----'-- ---- - ---------'-- -- -------------------------------- -- u 16 --+-- -- -- -- -- --+--Runoff Depth;4.49"_ LL 14 12 "�- 10 8 6 4 2 111 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 66 Hydrograph for Subcatchment 4S: Prop DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 1.04 0.27 1.66 5.00 5.60 4.24 0.97 7.50 5.86 4.49 0.00 10.00 5.86 4.49 0.00 12.50 5.86 4.49 0.00 15.00 5.86 4.49 0.00 17.50 5.86 4.49 0.00 20.00 5.86 4.49 0.00 22.50 5.86 4.49 0.00 25.00 5.86 4.49 0.00 27.50 5.86 4.49 0.00 30.00 5.86 4.49 0.00 32.50 5.86 4.49 0.00 35.00 5.86 4.49 0.00 37.50 5.86 4.49 0.00 40.00 5.86 4.49 0.00 42.50 5.86 4.49 0.00 45.00 5.86 4.49 0.00 47.50 5.86 4.49 0.00 50.00 5.86 4.49 0.00 52.50 5.86 4.49 0.00 55.00 5.86 4.49 0.00 57.50 5.86 4.49 0.00 60.00 5.86 4.49 0.00 62.50 5.86 4.49 0.00 65.00 5.86 4.49 0.00 67.50 5.86 4.49 0.00 70.00 5.86 4.49 0.00 72.50 5.86 4.49 0.00 75.00 5.86 4.49 0.00 77.50 5.86 4.49 0.00 80.00 5.86 4.49 0.00 82.50 5.86 4.49 0.00 85.00 5.86 4.49 0.00 87.50 5.86 4.49 0.00 90.00 5.86 4.49 0.00 92.50 5.86 4.49 0.00 95.00 5.86 4.49 0.00 97.50 5.86 4.49 0.00 100.00 5.86 4.49 0.00 102.50 5.86 4.49 0.00 105.00 5.86 4.49 0.00 107.50 5.86 4.49 0.00 110.00 5.86 4.49 0.00 112.50 5.86 4.49 0.00 115.00 5.86 4.49 0.00 117.50 5.86 4.49 0.00 120.00 5.86 4.49 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 67 Summary for Subcatchment 5S: Prop DA-2 [49] Hint: Tc<2dt may require smaller dt Runoff = 78.26 cfs @ 3.15 hrs, Volume= 3.326 af, Depth= 3.46" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 25-yr Rainfall=5.86" Area (ac) CN Description 5.240 98 Paved parking, HSG B 6.310 61 >75% Grass cover, Good, HSG B 11.550 78 Weighted Average 6.310 54.63% Pervious Area 5.240 45.37% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Direct Entry Subcatchment 5S: Prop DA-2 Hydrograph --r--1---1--r--r--r--r--r--1---1--r--r--r--t--r--r--r--1--r--r--r--r--r-- ■ Runoff 78.26 cfs ---III-- -- --I --I--II---III---III---- -- -- --I --II --III---III---- -- --I --II - -- -- -- --------------II-- -- -- -- _ _ _ --r--r--1---1--- ----TCh_arlo�felll6lirZ$=yr7s 70 --r- - ' -- -----------;----;---------------------+1----;---- -R-u-- io--ff--1-R--1a--inJ-f-a�l-l-=15--.L8-617 L" 6s 60Ard&11.550at-- - 55-I ---I ---I -- I -- I -- -I ---I --I ---I ---I ---I -- I --R1pn ff V-Ql"mle=120-cjf 50 1 1 w 1 1 1 1 1 1 1 -- -- ,-- , - - - -- -- -- -- --Runoff llD"thT146'F- 45 3 1---1---1--r--r--r--r--r--r--1--r--r--r--r--r--r--1---1--r--r--r--r--r-- 40 �C�SA Min LL 1---1---1--__1______1---1---1--------+------1---1-- � I I I I I I I I I I I I I I I I I I I I I I I 35---1---1----1--L--r--1---1---1--J--1--1--1--L--L--1---1--J--1- L 30 jPW_7& - 25 20 15---1--J----1--L------1---1--J--1--1--1--L--L--1---1--J----1--L--�-- 10 5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 68 Hydrograph for Subcatchment 5S: Prop DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 1.04 0.07 2.54 5.00 5.60 3.23 3.25 7.50 5.86 3.46 0.00 10.00 5.86 3.46 0.00 12.50 5.86 3.46 0.00 15.00 5.86 3.46 0.00 17.50 5.86 3.46 0.00 20.00 5.86 3.46 0.00 22.50 5.86 3.46 0.00 25.00 5.86 3.46 0.00 27.50 5.86 3.46 0.00 30.00 5.86 3.46 0.00 32.50 5.86 3.46 0.00 35.00 5.86 3.46 0.00 37.50 5.86 3.46 0.00 40.00 5.86 3.46 0.00 42.50 5.86 3.46 0.00 45.00 5.86 3.46 0.00 47.50 5.86 3.46 0.00 50.00 5.86 3.46 0.00 52.50 5.86 3.46 0.00 55.00 5.86 3.46 0.00 57.50 5.86 3.46 0.00 60.00 5.86 3.46 0.00 62.50 5.86 3.46 0.00 65.00 5.86 3.46 0.00 67.50 5.86 3.46 0.00 70.00 5.86 3.46 0.00 72.50 5.86 3.46 0.00 75.00 5.86 3.46 0.00 77.50 5.86 3.46 0.00 80.00 5.86 3.46 0.00 82.50 5.86 3.46 0.00 85.00 5.86 3.46 0.00 87.50 5.86 3.46 0.00 90.00 5.86 3.46 0.00 92.50 5.86 3.46 0.00 95.00 5.86 3.46 0.00 97.50 5.86 3.46 0.00 100.00 5.86 3.46 0.00 102.50 5.86 3.46 0.00 105.00 5.86 3.46 0.00 107.50 5.86 3.46 0.00 110.00 5.86 3.46 0.00 112.50 5.86 3.46 0.00 115.00 5.86 3.46 0.00 117.50 5.86 3.46 0.00 120.00 5.86 3.46 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 69 Summary for Subcatchment 6S: Prop DA-3 [49] Hint: Tc<2dt may require smaller dt Runoff = 9.05 cfs @ 3.16 hrs, Volume= 0.382 af, Depth= 2.60" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Charlotte 6-hr 25-yr Rainfall=5.86" Area (ac) CN Description 0.397 98 Paved parking, HSG B 1.363 61 >75% Grass cover, Good, HSG B 1.760 69 Weighted Average 1.363 77.44% Pervious Area 0.397 22.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time of Concentration Subcatchment 6S: Prop DA-3 Hydrograph --�---�---�-- �-- �--�I --�I --�I--�---�---�-- �-- �--�--�I --�I--�---�---�-- �-- �__�I --�I ❑Runoff 9.05 cfs ------ -- -- ------------ -- -- -- -- --------- -- -- -- -- -- 9 Cfilarllot66-hr12-yr RainfaIIT5.86•• --------- -- -- --; --I, -------,-- ----Rwnbff-AeeA=l-.76G ae-- 7 -- -- - ----1ROffI-t�plme=0.- 6 Runoff Depth=;2.601 I I I I I I I I I I I I I I I I I I I I I I I I I I I I 3 5 1--L-- 1--1--1--L-- -- TcT*.,O-said-- LL I I I I I I I I I I I I I I I I I I I I I I 4 3 2 ------'i--- -T-- T--T--T-----'i----T-- T-- T-- T--T-----'i----T-- T - - T Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 70 Hydrograph for Subcatchment 6S: Prop DA-3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 1.04 0.00 0.05 5.00 5.60 2.40 0.43 7.50 5.86 2.60 0.00 10.00 5.86 2.60 0.00 12.50 5.86 2.60 0.00 15.00 5.86 2.60 0.00 17.50 5.86 2.60 0.00 20.00 5.86 2.60 0.00 22.50 5.86 2.60 0.00 25.00 5.86 2.60 0.00 27.50 5.86 2.60 0.00 30.00 5.86 2.60 0.00 32.50 5.86 2.60 0.00 35.00 5.86 2.60 0.00 37.50 5.86 2.60 0.00 40.00 5.86 2.60 0.00 42.50 5.86 2.60 0.00 45.00 5.86 2.60 0.00 47.50 5.86 2.60 0.00 50.00 5.86 2.60 0.00 52.50 5.86 2.60 0.00 55.00 5.86 2.60 0.00 57.50 5.86 2.60 0.00 60.00 5.86 2.60 0.00 62.50 5.86 2.60 0.00 65.00 5.86 2.60 0.00 67.50 5.86 2.60 0.00 70.00 5.86 2.60 0.00 72.50 5.86 2.60 0.00 75.00 5.86 2.60 0.00 77.50 5.86 2.60 0.00 80.00 5.86 2.60 0.00 82.50 5.86 2.60 0.00 85.00 5.86 2.60 0.00 87.50 5.86 2.60 0.00 90.00 5.86 2.60 0.00 92.50 5.86 2.60 0.00 95.00 5.86 2.60 0.00 97.50 5.86 2.60 0.00 100.00 5.86 2.60 0.00 102.50 5.86 2.60 0.00 105.00 5.86 2.60 0.00 107.50 5.86 2.60 0.00 110.00 5.86 2.60 0.00 112.50 5.86 2.60 0.00 115.00 5.86 2.60 0.00 117.50 5.86 2.60 0.00 120.00 5.86 2.60 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 71 Summary for Pond 4P: Wet Pond 1 Inflow Area = 3.130 ac, 73.16% Impervious, Inflow Depth = 4.49" for 25-yr event Inflow = 26.38 cfs @ 3.15 hrs, Volume= 1.171 of Outflow = 7.32 cfs @ 3.40 hrs, Volume= 1.127 af, Atten= 72%, Lag= 15.1 min Primary = 7.32 cfs @ 3.40 hrs, Volume= 1.127 of Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 790.83' @ 3.40 hrs Surf.Area= 12,271 sf Storage= 27,242 cf Plug -Flow detention time= 522.8 min calculated for 1.127 of (96% of inflow) Center -of -Mass det. time= 520.0 min ( 724.5 - 204.5 ) Volume Invert Avail.Storage Storage Description #1 788.25' 42,548 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 788.25 8,900 0 0 789.00 9,858 7,034 7,034 790.00 11,185 10,522 17,556 791.00 12,500 11,843 29,398 792.00 13,800 13,150 42,548 Device Routing Invert Outlet Devices #1 Primary 788.25' 24.0" Round Culvert L= 250.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 788.25' / 787.00' S= 0.0050 T Cc= 0.900 n= 0.013, Flow Area= 3.14 sf #2 Device 1 788.25' 1.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 789.20' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 791.00' 16.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) #5 Secondary 791.50' 20.0' long x 10.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=7.32 cfs @ 3.40 hrs HW=790.83' (Free Discharge) L1=Culvert (Passes 7.32 cfs of 16.81 cfs potential flow) �2=Orifice/Grate (Orifice Controls 0.04 cfs @ 7.66 fps) 3=Orifice/Grate (Orifice Controls 7.28 cfs @ 5.46 fps) 4=S ha rp-C rested Vee/Trap Weir( Controls 0.00 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=788.25' (Free Discharge) L5= Broad -crested Rectangular Weir( Controls 0.00 cfs) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD® 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 72 Pond 4P: Wet Pond 1 Hydrograph 26.38 CfS ■ In r-r--r----t----r----r--r-r--r-r--r-r--ram-rig-�r�}----�}t----rt-- ■Outflow �acN Primary 28 �� � �--�-�--�--�--�--�--�--�--�--�--�- � IfQ � �! ■Secondary 26 --- ---- ---- ---- ---- -- - -- - Il'Pe4R �Ie 1—, v vl -- r--r-r--r----?----Y--I--r--I--r--r-r--�r�-7--r--I--/r�--I--?y�-�--II--I 24+--+-+--+----+----+----+----+--+-+�kh/��L�.4FL-kit-- 22 20 18 -- -+--+----+----+--,--+--,--+--1-+--+-+--+----+----+----+16- - w 3 14 o ---i ,r ,T,,--j --1 F- --j __,,r ,T, LL 12 --r-r--1--I--t--I--r--I--r--r-r--r-r--r-r--r--I--r--I--t--I--r-- 1 7.32 cfs--L-J--L--1--1--1--1--1--1------L-1-- -J--L----L--1--1----i-- 8 6 I I I I I I I I I I I I I I I I I I I I I I 0.00 CfS 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) 792 791 v v w c 0 R 790 v w 789 Pond 4P: Wet Pond 1 Stage -Discharge 0 5 10 15 20 25 30 35 Discharge (cfs) Total ❑ Primary Secondary Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD® 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 73 792 791 v v c 0 790 v w 789 Pond 4P: Wet Pond 1 Stage -Area -Storage Surface/HorizontaiMetted Area (sq-ft) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 Storage (cubic -feet) S Surface ■ Storage Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 74 Hydrograph for Pond 4P: Wet Pond 1 Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 788.25 0.00 0.00 0.00 2.50 1.66 2,606 788.54 0.01 0.01 0.00 5.00 0.97 13,428 789.62 1.79 1.79 0.00 7.50 0.00 9,773 789.27 0.15 0.15 0.00 10.00 0.00 9,132 789.21 0.04 0.04 0.00 12.50 0.00 8,891 789.19 0.02 0.02 0.00 15.00 0.00 8,669 789.16 0.02 0.02 0.00 17.50 0.00 8,450 789.14 0.02 0.02 0.00 20.00 0.00 8,233 789.12 0.02 0.02 0.00 22.50 0.00 8,019 789.10 0.02 0.02 0.00 25.00 0.00 7,808 789.08 0.02 0.02 0.00 27.50 0.00 7,600 789.06 0.02 0.02 0.00 30.00 0.00 7,395 789.04 0.02 0.02 0.00 32.50 0.00 7,192 789.02 0.02 0.02 0.00 35.00 0.00 6,992 789.00 0.02 0.02 0.00 37.50 0.00 6,795 788.98 0.02 0.02 0.00 40.00 0.00 6,601 788.96 0.02 0.02 0.00 42.50 0.00 6,410 788.94 0.02 0.02 0.00 45.00 0.00 6,222 788.92 0.02 0.02 0.00 47.50 0.00 6,036 788.90 0.02 0.02 0.00 50.00 0.00 5,854 788.88 0.02 0.02 0.00 52.50 0.00 5,674 788.86 0.02 0.02 0.00 55.00 0.00 5,497 788.84 0.02 0.02 0.00 57.50 0.00 5,323 788.82 0.02 0.02 0.00 60.00 0.00 5,152 788.81 0.02 0.02 0.00 62.50 0.00 4,984 788.79 0.02 0.02 0.00 65.00 0.00 4,819 788.77 0.02 0.02 0.00 67.50 0.00 4,657 788.75 0.02 0.02 0.00 70.00 0.00 4,497 788.74 0.02 0.02 0.00 72.50 0.00 4,341 788.72 0.02 0.02 0.00 75.00 0.00 4,187 788.71 0.02 0.02 0.00 77.50 0.00 4,037 788.69 0.02 0.02 0.00 80.00 0.00 3,889 788.67 0.02 0.02 0.00 82.50 0.00 3,744 788.66 0.02 0.02 0.00 85.00 0.00 3,603 788.64 0.02 0.02 0.00 87.50 0.00 3,464 788.63 0.02 0.02 0.00 90.00 0.00 3,328 788.61 0.01 0.01 0.00 92.50 0.00 3,196 788.60 0.01 0.01 0.00 95.00 0.00 3,066 788.59 0.01 0.01 0.00 97.50 0.00 2,939 788.57 0.01 0.01 0.00 100.00 0.00 2,815 788.56 0.01 0.01 0.00 102.50 0.00 2,695 788.55 0.01 0.01 0.00 105.00 0.00 2,577 788.53 0.01 0.01 0.00 107.50 0.00 2,462 788.52 0.01 0.01 0.00 110.00 0.00 2,350 788.51 0.01 0.01 0.00 112.50 0.00 2,242 788.50 0.01 0.01 0.00 115.00 0.00 2,136 788.49 0.01 0.01 0.00 117.50 0.00 2,033 788.47 0.01 0.01 0.00 120.00 0.00 1,934 788.46 0.01 0.01 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 75 Summary for Pond 5P: Wet Pond 2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth = 3.46" for 25-yr event Inflow = 78.26 cfs @ 3.15 hrs, Volume= 3.326 of Outflow = 25.60 cfs @ 3.38 hrs, Volume= 3.292 af, Atten= 67%, Lag= 13.6 min Primary = 25.60 cfs @ 3.38 hrs, Volume= 3.292 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 781.18' @ 3.38 hrs Surf.Area= 20,790 sf Storage= 72,693 cf Plug -Flow detention time= 445.3 min calculated for 3.291 of (99% of inflow) Center -of -Mass det. time= 446.4 min ( 657.9 - 211.5 ) Volume Invert Avail.Storage Storage Description #1 776.50' 90,572 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 776.50 9,508 0 0 777.00 11,638 5,287 5,287 778.00 13,738 12,688 17,975 779.00 15,894 14,816 32,791 780.00 18,107 17,001 49,791 781.00 20,376 19,242 69,033 782.00 22,702 21,539 90,572 Device Routing Invert Outlet Devices #1 Primary 766.70' 30.0" Round Culvert L= 50.0' Ke= 0.500 Inlet / Outlet Invert= 766.70' / 766.29' S= 0.0082 T Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 776.50' 1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 778.15' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 779.50' 24.0" W x 4.0" H Vert. Orifice/Grate C= 0.600 #5 Device 1 780.75' 12.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) Primary OutFlow Max=25.42 cfs @ 3.38 hrs HW=781.17' (Free Discharge) L1=Culvert (Passes 25.42 cfs of 85.95 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.13 cfs @ 10.34 fps) 3=Orifice/Grate (Orifice Controls 10.52 cfs @ 7.89 fps) 4=Orifice/Grate (Orifice Controls 3.94 cfs @ 5.91 fps) 5=Sharp-Crested Vee/Trap Weir (Weir Controls 10.83 cfs @ 2.13 fps) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 76 Pond 5P: Wet Pond 2 Hydrograph --I--r--r--r--r--I--r--r--r--I--r--t--r--r--I--t--r--I---I--r--r--r--I-- ■ Inflow 78.26 CfS -- -- -- -- -- -- -- -- -- -- -- -- - -- ■ Primary 80-J--i--L-------1--L--' J--l-r O�N- ►r = �s 'Laq_ 75 Peak' 70- 65--------il---------'i --il-----i-- T --il------}--r------- �J----`-Q------- age 60 - -- T-- T-- T---------T--I --I--T--T--T--I---I--T--T -------T--T--T--'I-- 55 ---r--r--r--r--I--r--r--r--I--r--t--r--r--I--t--r--I---I--r--r--r--I-- w 50 45 - - -- - - + - - -- - - - - - - - + - - L - - - - - - - -- - - L - - -- - -I- - 0 40 LL _ _L__L__L__I___I____L______-L--L--LI__L__LII_-L--L--L__I__ 35 25.60 Cfs 25 1' [ I I I I I I I I I I I I I I I I a 20 15 -I- -r--r--r--r--I--r--r--r--I--r--t--r--r--I--r--r--I---I--r--r--r--I-- 10 w 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Pond 5P: Wet Pond 2 Stage -Discharge 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Discharge (cfs) ❑ Primary Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 77 Pond 5P: Wet Pond 2 Stage -Area -Storage Surface/HorizontaiMefted Area (sq-ft) 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 Storage (cubic -feet) ■ Surface ■ Storage Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 78 Hydrograph for Pond 5P: Wet Pond 2 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 776.50 0.00 2.50 2.54 2,055 776.71 0.02 5.00 3.25 42,306 779.58 6.92 7.50 0.00 22,701 778.34 0.59 10.00 0.00 20,425 778.18 0.11 12.50 0.00 19,684 778.12 0.07 15.00 0.00 19,025 778.08 0.07 17.50 0.00 18,376 778.03 0.07 20.00 0.00 17,737 777.98 0.07 22.50 0.00 17,108 777.94 0.07 25.00 0.00 16,490 777.89 0.07 27.50 0.00 15,882 777.85 0.07 30.00 0.00 15,285 777.80 0.07 32.50 0.00 14,699 777.76 0.06 35.00 0.00 14,123 777.71 0.06 37.50 0.00 13,558 777.67 0.06 40.00 0.00 13,004 777.63 0.06 42.50 0.00 12,460 777.59 0.06 45.00 0.00 11,928 777.54 0.06 47.50 0.00 11,407 777.50 0.06 50.00 0.00 10,897 777.46 0.06 52.50 0.00 10,398 777.42 0.05 55.00 0.00 9,910 777.38 0.05 57.50 0.00 9,434 777.35 0.05 60.00 0.00 8,969 777.31 0.05 62.50 0.00 8,516 777.27 0.05 65.00 0.00 8,074 777.23 0.05 67.50 0.00 7,644 777.20 0.05 70.00 0.00 7,226 777.16 0.05 72.50 0.00 6,819 777.13 0.04 75.00 0.00 6,424 777.10 0.04 77.50 0.00 6,042 777.06 0.04 80.00 0.00 5,671 777.03 0.04 82.50 0.00 5,313 777.00 0.04 85.00 0.00 4,966 776.97 0.04 87.50 0.00 4,632 776.94 0.04 90.00 0.00 4,310 776.91 0.04 92.50 0.00 4,001 776.89 0.03 95.00 0.00 3,705 776.86 0.03 97.50 0.00 3,421 776.83 0.03 100.00 0.00 3,150 776.81 0.03 102.50 0.00 2,893 776.79 0.03 105.00 0.00 2,648 776.76 0.03 107.50 0.00 2,417 776.74 0.02 110.00 0.00 2,200 776.72 0.02 112.50 0.00 1,996 776.70 0.02 115.00 0.00 1,806 776.68 0.02 117.50 0.00 1,629 776.67 0.02 120.00 0.00 1,467 776.65 0.02 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 79 Summary for Link 3L: Ex Drainage Areas Inflow Area = 12.850 ac, 4.24% Impervious, Inflow Depth = 2.74" for 25-yr event Inflow = 55.16 cfs @ 3.26 hrs, Volume= 2.931 of Primary = 55.16 cfs @ 3.26 hrs, Volume= 2.931 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 3L: Ex Drainage Areas Hydrograph --- - 7--7--7--I--- I-- 7-- T-----I--7--T--7--I---I--T-- 7--I---I-- 7-- 7--7 --I-- I I ❑ Inflow - --- - r------- -- - r--Ir---- --t--Ir-------7--r----------r--Ir--I�-- ❑ Primary 55.16 cfs ---------r-------,--r------- --rt-Irlflo W re47 _2 �c - 55 50 -----rt--r---------r--Ir------+--Ir----ti--+--r-------rt--r--Ir--Ii-- 45 -I--r--r--r--r--I- -r- -r--r--I--r--t--r--r--I--r--r--I--- I--r--r--r--I-- w35 u --+--+--r--r----+--+--r----+--+--r--r----+--r-------+--r--r--I-- I I I I I I I I I I I I I I I I I I I I I I 30 --+--+--+-------+--+-------+--+--+-------+--+-------+--+--+--I-- o I I I I I I I I I I I I I I I I I I I I I I LL 25 --+--+--r-------+--+-------+--+--+-------+--+-------+--r--+--I-- 20 --+--+--+-------+--+-------+--+--+--+-+--+--+----+--+--+--+--I-- 15 --+--+--+-------+--+-------+--+--+--+-+--+--+----+--+--+--+--I-- 10 --+--+--+--+-+--+--+-------+--+--+--+----+--+----+--+--+--+--I-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 80 Hydrograph for Link 3L: Ex Drainage Areas Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.24 0.00 0.24 5.00 3.40 0.00 3.40 7.50 0.00 0.00 0.00 10.00 0.00 0.00 0.00 12.50 0.00 0.00 0.00 15.00 0.00 0.00 0.00 17.50 0.00 0.00 0.00 20.00 0.00 0.00 0.00 22.50 0.00 0.00 0.00 25.00 0.00 0.00 0.00 27.50 0.00 0.00 0.00 30.00 0.00 0.00 0.00 32.50 0.00 0.00 0.00 35.00 0.00 0.00 0.00 37.50 0.00 0.00 0.00 40.00 0.00 0.00 0.00 42.50 0.00 0.00 0.00 45.00 0.00 0.00 0.00 47.50 0.00 0.00 0.00 50.00 0.00 0.00 0.00 52.50 0.00 0.00 0.00 55.00 0.00 0.00 0.00 57.50 0.00 0.00 0.00 60.00 0.00 0.00 0.00 62.50 0.00 0.00 0.00 65.00 0.00 0.00 0.00 67.50 0.00 0.00 0.00 70.00 0.00 0.00 0.00 72.50 0.00 0.00 0.00 75.00 0.00 0.00 0.00 77.50 0.00 0.00 0.00 80.00 0.00 0.00 0.00 82.50 0.00 0.00 0.00 85.00 0.00 0.00 0.00 87.50 0.00 0.00 0.00 90.00 0.00 0.00 0.00 92.50 0.00 0.00 0.00 95.00 0.00 0.00 0.00 97.50 0.00 0.00 0.00 100.00 0.00 0.00 0.00 102.50 0.00 0.00 0.00 105.00 0.00 0.00 0.00 107.50 0.00 0.00 0.00 110.00 0.00 0.00 0.00 112.50 0.00 0.00 0.00 115.00 0.00 0.00 0.00 117.50 0.00 0.00 0.00 120.00 0.00 0.00 0.00 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 81 Summary for Link 7L: POI-1 Inflow Area = 4.890 ac, 54.95% Impervious, Inflow Depth > 3.70" for 25-yr event Inflow = 14.43 cfs @ 3.18 hrs, Volume= 1.509 of Primary = 14.43 cfs @ 3.18 hrs, Volume= 1.509 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 7L: POI-1 Hydrograph -- --' -----'-- --' ---------' --------'-- --'-----'-- — ----' --'-- ❑ Inflow cfs --- -- -- ------- -- -------�-- - - Inf;Iow Area=4-,890 ac-- ❑Primary 14 1134 12 ------------------------------------------- -- L -- 1 -- L-----'-- L -- L-----'-- L -- 1 --L-----'-- 1 -- L-----'-- 1 -- L --L --'-- w 9- 8 - - - - - - - - - - - - - - - - - - - t t - - - - - - - - - - - - - - - - - - - O 1--J---L L--1---1-- --L--'---'--L--L--L-------L--L-------L--L--L--'-- 6 5 r-r--r--r--r--i--r--r--r--i--r--r--r--r--i--r--r--r--i--r--r--r--i-- 4 3 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 82 Hydrograph for Link 7L: POI-1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.06 0.00 0.06 5.00 2.23 0.00 2.23 7.50 0.15 0.00 0.15 10.00 0.04 0.00 0.04 12.50 0.02 0.00 0.02 15.00 0.02 0.00 0.02 17.50 0.02 0.00 0.02 20.00 0.02 0.00 0.02 22.50 0.02 0.00 0.02 25.00 0.02 0.00 0.02 27.50 0.02 0.00 0.02 30.00 0.02 0.00 0.02 32.50 0.02 0.00 0.02 35.00 0.02 0.00 0.02 37.50 0.02 0.00 0.02 40.00 0.02 0.00 0.02 42.50 0.02 0.00 0.02 45.00 0.02 0.00 0.02 47.50 0.02 0.00 0.02 50.00 0.02 0.00 0.02 52.50 0.02 0.00 0.02 55.00 0.02 0.00 0.02 57.50 0.02 0.00 0.02 60.00 0.02 0.00 0.02 62.50 0.02 0.00 0.02 65.00 0.02 0.00 0.02 67.50 0.02 0.00 0.02 70.00 0.02 0.00 0.02 72.50 0.02 0.00 0.02 75.00 0.02 0.00 0.02 77.50 0.02 0.00 0.02 80.00 0.02 0.00 0.02 82.50 0.02 0.00 0.02 85.00 0.02 0.00 0.02 87.50 0.02 0.00 0.02 90.00 0.01 0.00 0.01 92.50 0.01 0.00 0.01 95.00 0.01 0.00 0.01 97.50 0.01 0.00 0.01 100.00 0.01 0.00 0.01 102.50 0.01 0.00 0.01 105.00 0.01 0.00 0.01 107.50 0.01 0.00 0.01 110.00 0.01 0.00 0.01 112.50 0.01 0.00 0.01 115.00 0.01 0.00 0.01 117.50 0.01 0.00 0.01 120.00 0.01 0.00 0.01 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 83 Summary for Link 8L: POI-2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth > 3.42" for 25-yr event Inflow = 25.60 cfs @ 3.38 hrs, Volume= 3.292 of Primary = 25.60 cfs @ 3.38 hrs, Volume= 3.292 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 8L: POI-2 Hydrograph ❑ Inflow -------- '---'----L--1---1--J--1--L--1-----1--L--1---------�--'- 25.60 cf s - ❑ Primary T--T-------T--T-IT-flow-rVc=j-1T5$0,a 2422 11 20 18- --J--1--L--1-----1--L--1---1--J--1--L--1-----1--L--1-----1--L--+---- w 16 r- ----r--r--i----r-----i----T--r--r----T--r--r--i----r--r--i-- 3 14 0 --+--+--+-------+--+-------+--+--+-------+--+-------+--+--+--i-- 1 0 I I I 8- 6- 4- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 84 Hydrograph for Link 8L: POI-2 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.02 0.00 0.02 5.00 6.92 0.00 6.92 7.50 0.59 0.00 0.59 10.00 0.11 0.00 0.11 12.50 0.07 0.00 0.07 15.00 0.07 0.00 0.07 17.50 0.07 0.00 0.07 20.00 0.07 0.00 0.07 22.50 0.07 0.00 0.07 25.00 0.07 0.00 0.07 27.50 0.07 0.00 0.07 30.00 0.07 0.00 0.07 32.50 0.06 0.00 0.06 35.00 0.06 0.00 0.06 37.50 0.06 0.00 0.06 40.00 0.06 0.00 0.06 42.50 0.06 0.00 0.06 45.00 0.06 0.00 0.06 47.50 0.06 0.00 0.06 50.00 0.06 0.00 0.06 52.50 0.05 0.00 0.05 55.00 0.05 0.00 0.05 57.50 0.05 0.00 0.05 60.00 0.05 0.00 0.05 62.50 0.05 0.00 0.05 65.00 0.05 0.00 0.05 67.50 0.05 0.00 0.05 70.00 0.05 0.00 0.05 72.50 0.04 0.00 0.04 75.00 0.04 0.00 0.04 77.50 0.04 0.00 0.04 80.00 0.04 0.00 0.04 82.50 0.04 0.00 0.04 85.00 0.04 0.00 0.04 87.50 0.04 0.00 0.04 90.00 0.04 0.00 0.04 92.50 0.03 0.00 0.03 95.00 0.03 0.00 0.03 97.50 0.03 0.00 0.03 100.00 0.03 0.00 0.03 102.50 0.03 0.00 0.03 105.00 0.03 0.00 0.03 107.50 0.02 0.00 0.02 110.00 0.02 0.00 0.02 112.50 0.02 0.00 0.02 115.00 0.02 0.00 0.02 117.50 0.02 0.00 0.02 120.00 0.02 0.00 0.02 Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 85 Summary for Link 9L: Combined Inflow Area = 16.440 ac, 48.22% Impervious, Inflow Depth > 3.50" for 25-yr event Inflow = 36.40 cfs @ 3.37 hrs, Volume= 4.801 of Primary = 36.40 cfs @ 3.37 hrs, Volume= 4.801 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 9L: Combined Hydrograph ----L--'---'----L--L--1--J--L--L----J--L--L---------L--+--'-- ❑Inflow ------'---'------'---'------��--------------------------�--- '-- ❑ Primary 36.40 cfs ---T--T------- --T-------T--t-Inflow 1 r',ec=j-6A40'-ac,- 36 34 32 30 28 26 --+--+--+--+-+--+--+--+-+--+--+--+--+-+--+--+----+--+--+--+-+-- 24 -- -- --T------- - -T-------T- -T --T-------T--T- --- ------T--T--T- u22 ----- -- ------- -- ---------- ---------- --------- --------- 3 20 ---'----------'--'------------------------------------------'- - o M 18 --J--L--L--'---'--L--L--'---'--J--L--L-------L--L-------L--L--L--'-- 16 --L--L--L--'---'--L--L--'---'--L--+--L-------+--L-------L--L--L--'-- 14 --T--T--T--Ir--li-- --T--T----T--T--T--Ir--li--+--T--li---li--T--T--T--li-- 12 -L- --- - r-------L--+--i ----L--T--L-------+--r -------L--r --L--i-- 10 --I -- _ _-- - - -I- - _ _ _ _� - -I- - -I -- _ _-- - - -I- - --I-- 8 I 6 -J--L--L--'---'--L--L--'---'--L--L--L-------L--L-------L--L--L--'-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Charlotte 6-hr 25-yr Rainfall=5.86" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 86 Hydrograph for Link 9L: Combined Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.08 0.00 0.08 5.00 9.15 0.00 9.15 7.50 0.75 0.00 0.75 10.00 0.15 0.00 0.15 12.50 0.10 0.00 0.10 15.00 0.10 0.00 0.10 17.50 0.10 0.00 0.10 20.00 0.09 0.00 0.09 22.50 0.09 0.00 0.09 25.00 0.09 0.00 0.09 27.50 0.09 0.00 0.09 30.00 0.09 0.00 0.09 32.50 0.09 0.00 0.09 35.00 0.09 0.00 0.09 37.50 0.08 0.00 0.08 40.00 0.08 0.00 0.08 42.50 0.08 0.00 0.08 45.00 0.08 0.00 0.08 47.50 0.08 0.00 0.08 50.00 0.08 0.00 0.08 52.50 0.07 0.00 0.07 55.00 0.07 0.00 0.07 57.50 0.07 0.00 0.07 60.00 0.07 0.00 0.07 62.50 0.07 0.00 0.07 65.00 0.07 0.00 0.07 67.50 0.06 0.00 0.06 70.00 0.06 0.00 0.06 72.50 0.06 0.00 0.06 75.00 0.06 0.00 0.06 77.50 0.06 0.00 0.06 80.00 0.06 0.00 0.06 82.50 0.06 0.00 0.06 85.00 0.05 0.00 0.05 87.50 0.05 0.00 0.05 90.00 0.05 0.00 0.05 92.50 0.05 0.00 0.05 95.00 0.05 0.00 0.05 97.50 0.04 0.00 0.04 100.00 0.04 0.00 0.04 102.50 0.04 0.00 0.04 105.00 0.04 0.00 0.04 107.50 0.04 0.00 0.04 110.00 0.04 0.00 0.04 112.50 0.03 0.00 0.03 115.00 0.03 0.00 0.03 117.50 0.03 0.00 0.03 120.00 0.03 0.00 0.03 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall= 7.36 " Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD@ 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 87 Time span=0.00-120.00 hrs, dt=0.05 hrs, 2401 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1 S: Ex DA-1 Runoff Area=6.010 ac 5.66% Impervious Runoff Depth=4.03" Flow Length=699' Tc=12.0 min CN=71 Runoff=34.33 cfs 2.018 of Subcatchment2S: Ex DA-2 Runoff Area=6.840 ac 3.00% Impervious Runoff Depth=3.92" Flow Length=790' Tc=13.1 min CN=70 Runoff=36.72 cfs 2.234 of Subcatchment4S: Prop DA-1 Runoff Area=3.130 ac 73.16% Impervious Runoff Depth=5.94" Tc=5.0 min CN=88 Runoff=30.82 cfs 1.550 of Subcatchment5S: Prop DA-2 Runoff Area=11.550 ac 45.37% Impervious Runoff Depth=4.80" Tc=5.0 min CN=78 Runoff=97.19 cfs 4.623 of Subcatchment6S: Prop DA-3 Runoff Area=1.760 ac 22.56% Impervious Runoff Depth=3.81" Tc=5.0 min CN=69 Runoff=12.04 cfs 0.559 of Pond 4P: Wet Pond 1 Peak Elev=791.14' Storage=31,143 cf Inflow=30.82 cfs 1.550 of Primary=10.61 cfs 1.489 of Secondary=0.00 cfs 0.000 of Outflow=10.61 cfs 1.489 of Pond 5P: Wet Pond 2 Peak Elev=781.64' Storage=82,474 cf Inflow=97.19 cfs 4.623 of Outflow=48.84 cfs 4.557 of Link 3L: Ex Drainage Areas Inflow=70.95 cfs 4.252 of Primary=70.95 cfs 4.252 of Link 7L: P0I-1 Inflow=19.10 cfs 2.048 of Primary=19.10 cfs 2.048 of Link 8L: P0I-2 Inflow=48.84 cfs 4.557 of Primary=48.84 cfs 4.557 of Link 9L: Combined Inflow=64.81 cfs 6.605 of Primary=64.81 cfs 6.605 of Total Runoff Area = 29.290 ac Runoff Volume = 10.984 of Average Runoff Depth = 4.50" 71.08% Pervious = 20.818 ac 28.92% Impervious = 8.472 ac Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 88 Summary for Subcatchment 1S: Ex DA-1 Runoff = 34.33 cfs @ 12.04 hrs, Volume= 2.018 af, Depth= 4.03" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=7.36" Area (ac) CN Description 5.670 69 50-75% Grass cover, Fair, HSG B 0.340 98 Paved parking, HSG B 6.010 71 Weighted Average 5.670 94.34% Pervious Area 0.340 5.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.0 75 0.0400 0.18 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.6 387 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.4 237 0.0100 10.72 64.33 Channel Flow, Roadside Swale Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.022 Earth, clean & straight 12.0 699 Total Subcatchment 1S: Ex DA-1 Hydrograph ------------1--L----1---1---1--J--1--1--1--L-- --1---1--J--1--1--L--L-- 38--1--L----1---1---1--J--1--1--1--L--L--1---1--J--1--1--L--L-- ■Runoff 36 34.33 cfs --i-- ----------1--J--1--1--1--L-- -------J-p--1--L--L-- 34 --'-- --'----1--1-- --'-----'----1--1--1--L-------'1� -H-L -hLr - 32 --'-- --'---'---'--'-------------------------------------------------- 30 - - - - -- - - - - -- I.1001 Rai nfallT73V 28 - - - - - - - - - - - - --- n6ff-Ares=6.916 -ad - 26 ---- --- -- -- --------------- -- ---nn-Q-{{-----'-'-m--- -- -A- -�-f-- 24 ]Zp �+22 ---- --- -- -- --------------- -- -- -- ---_ 1 RunofUD"th=403'r- 20 --- --- -- -- --------------- -- -- -- - -- - LL 16 14 --,-- --- -- --; --; --;---------- -- -- --; --; -----, q7-12 0-mip- 12 --�-- -�-- -- -- ---- ----- -- i- 8 6 4 ---- --- -- -- --------------- -- -- --------------- -- -- ----- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 89 Hydrograph for Subcatchment 1S: Ex DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.21 0.00 0.00 5.00 0.46 0.00 0.00 7.50 0.80 0.00 0.00 10.00 1.33 0.06 0.32 12.50 5.41 2.43 4.61 15.00 6.28 3.13 1.14 17.50 6.71 3.48 0.73 20.00 7.01 3.73 0.51 22.50 7.23 3.92 0.45 25.00 7.36 4.03 0.00 27.50 7.36 4.03 0.00 30.00 7.36 4.03 0.00 32.50 7.36 4.03 0.00 35.00 7.36 4.03 0.00 37.50 7.36 4.03 0.00 40.00 7.36 4.03 0.00 42.50 7.36 4.03 0.00 45.00 7.36 4.03 0.00 47.50 7.36 4.03 0.00 50.00 7.36 4.03 0.00 52.50 7.36 4.03 0.00 55.00 7.36 4.03 0.00 57.50 7.36 4.03 0.00 60.00 7.36 4.03 0.00 62.50 7.36 4.03 0.00 65.00 7.36 4.03 0.00 67.50 7.36 4.03 0.00 70.00 7.36 4.03 0.00 72.50 7.36 4.03 0.00 75.00 7.36 4.03 0.00 77.50 7.36 4.03 0.00 80.00 7.36 4.03 0.00 82.50 7.36 4.03 0.00 85.00 7.36 4.03 0.00 87.50 7.36 4.03 0.00 90.00 7.36 4.03 0.00 92.50 7.36 4.03 0.00 95.00 7.36 4.03 0.00 97.50 7.36 4.03 0.00 100.00 7.36 4.03 0.00 102.50 7.36 4.03 0.00 105.00 7.36 4.03 0.00 107.50 7.36 4.03 0.00 110.00 7.36 4.03 0.00 112.50 7.36 4.03 0.00 115.00 7.36 4.03 0.00 117.50 7.36 4.03 0.00 120.00 7.36 4.03 0.00 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 90 Summary for Subcatchment 2S: Ex DA-2 Runoff = 36.72 cfs @ 12.05 hrs, Volume= 2.234 af, Depth= 3.92" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=7.36" Area (ac) CN Description 6.635 69 50-75% Grass cover, Fair, HSG B 0.205 98 Paved parking, HSG B 6.840 70 Weighted Average 6.635 97.00% Pervious Area 0.205 3.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 7.8 75 0.0300 0.16 Sheet Flow, Sheet Flow Grass: Short n= 0.150 P2= 2.28" 4.8 400 0.0400 1.40 Shallow Concentrated Flow, Shallow Concentrated Flow Short Grass Pasture Kv= 7.0 fps 0.5 315 0.0150 11.56 69.34 Channel Flow, Channel Flow Area= 6.0 sf Perim= 3.0' r= 2.00' n= 0.025 Earth, clean & winding 13.1 790 Total Subcatchment 2S: Ex DA-2 Hydrograph 40 � � � cfs38 � � --------I-- � � T -- � � � T -- � ----I T -- T - -T --T-------,---- � � � � � � � � � � � -T=- ----TI ----rI -----r---b--�- ■Runoff -3-6I -.72 ----I ------I ------I -----I ---=I --------------T----=-_-2----- u36 � pe - 34 32 T- 0Cy(RiWnfe[[iT-c1L-- 11r - - 30 28 ---- -----L--L--L--1---1---1--J--1--1--TWnbfi-Aeect-6.840 --I---I----4--L----------I----4--4--+------I---------+--+w--�-- ad - p1 24 22 --r----y--rt--t--r--r-------y--rt--rt- ---- ----T-----------I---- `T Y V Y I T--r--r--r--I--y----T--r--r-- II De- p-t-h= a.921.- 20 c LL 18 --II------I--T-I----TI I I----T-I----TI----TI--A-I_uno# --[b-�'L6n =790F I -I-=---------I--I --I -----------------I--I --I-----IITr-��.'1 m��-- 14 12 -- -----L--L-- --I-----L--L--L--L--1---1---1--J--1--L--L--L--L--1---1--J--L-j1Y=76 --1---1---1--J--1--L--L--L--L-----I- -T-ww-''L- 10 --I-- -I-- -- -- -- --------I-- -- -- --+-- -- -----I-- -- --+-- -- -- $ ------1--+--+--r--r-------------+--r--r------- -----T--r--r-- 6 --I-- -__7--rt--Y__r--________7--rt--rt--T--Y--r-------7----Y--Y--r-- 4 i --I�--- I--T- -T- -T- -T--I -------T- -T- -T--T--T--T-------T--T--T--T--T- Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 91 Hydrograph for Subcatchment 2S: Ex DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.21 0.00 0.00 5.00 0.46 0.00 0.00 7.50 0.80 0.00 0.00 10.00 1.33 0.05 0.32 12.50 5.41 2.34 5.45 15.00 6.28 3.03 1.28 17.50 6.71 3.38 0.82 20.00 7.01 3.62 0.57 22.50 7.23 3.81 0.50 25.00 7.36 3.92 0.00 27.50 7.36 3.92 0.00 30.00 7.36 3.92 0.00 32.50 7.36 3.92 0.00 35.00 7.36 3.92 0.00 37.50 7.36 3.92 0.00 40.00 7.36 3.92 0.00 42.50 7.36 3.92 0.00 45.00 7.36 3.92 0.00 47.50 7.36 3.92 0.00 50.00 7.36 3.92 0.00 52.50 7.36 3.92 0.00 55.00 7.36 3.92 0.00 57.50 7.36 3.92 0.00 60.00 7.36 3.92 0.00 62.50 7.36 3.92 0.00 65.00 7.36 3.92 0.00 67.50 7.36 3.92 0.00 70.00 7.36 3.92 0.00 72.50 7.36 3.92 0.00 75.00 7.36 3.92 0.00 77.50 7.36 3.92 0.00 80.00 7.36 3.92 0.00 82.50 7.36 3.92 0.00 85.00 7.36 3.92 0.00 87.50 7.36 3.92 0.00 90.00 7.36 3.92 0.00 92.50 7.36 3.92 0.00 95.00 7.36 3.92 0.00 97.50 7.36 3.92 0.00 100.00 7.36 3.92 0.00 102.50 7.36 3.92 0.00 105.00 7.36 3.92 0.00 107.50 7.36 3.92 0.00 110.00 7.36 3.92 0.00 112.50 7.36 3.92 0.00 115.00 7.36 3.92 0.00 117.50 7.36 3.92 0.00 120.00 7.36 3.92 0.00 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 92 Summary for Subcatchment 4S: Prop DA-1 [49] Hint: Tc<2dt may require smaller dt Runoff = 30.82 cfs @ 11.95 hrs, Volume= 1.550 af, Depth= 5.94" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=7.36" Area (ac) CN Description 2.290 98 Paved parking, HSG B 0.840 61 >75% Grass cover, Good, HSG B 3.130 88 Weighted Average 0.840 26.84% Pervious Area 2.290 73.16% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, ToC Subcatchment 4S: Prop DA-1 Hydrograph 34--------I-- -- -- --I--------'i-- -- -- -- -------------'i-- -- -- --'i -- Runoff 3z 30.82 cfs T T�/ --------r--r--r--r--r-------r--r--r--t--r--r-----i1ype' -II+� _�+�r -- 30 --�-- -----+--+-----------------+---------1- 28 1n -- - -- -- -- - -- -- -- -- -- -- -----11}0�rRain al[T7.36'� 26 I I 1 I 1 1 24 Runbff AeeA=3.130 at --r---i--r--r--r--r--r--i---i--r--r--r--t{-�-.fir--r--r-F-i--r--r--r--r-�rf-- 22----+--+--+--+----------+--+-- R••Yi~��l�T"'ie31•Y��T• w20 --'i-- --'i-- I'i-- I'i--'i --'i --i--------'i-- I'i-- -- ----- --- rt �r- 18 -- ---- -- -- ------------- -- -- -- --RunoffDeepthCCT15.94"-- LL --r- ----r--r--r--r--r-------r--r--r--t--r--r--r--i- 14---+--+--+--+---------+--+--+--+--+--+-------+--+- +- 12 ---- r' N=8,8 - ---- ---- ---------------------------------------------------------- 10 ---- -------------------------------------------------------------- 8 --r- -i--r--r--r--r--r--i---i--r--r--r--t--r--r--r--i--r--r--t--r--r-- 6 ------+--+--+--+---------+--+--+--+--+--+-------+--+--+--+--+-- 4 2 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 93 Hydrograph for Subcatchment 4S: Prop DA-1 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.21 0.00 0.00 5.00 0.46 0.02 0.08 7.50 0.80 0.15 0.23 10.00 1.33 0.46 0.61 12.50 5.41 4.06 2.32 15.00 6.28 4.90 0.69 17.50 6.71 5.31 0.44 20.00 7.01 5.60 0.30 22.50 7.23 5.82 0.27 25.00 7.36 5.94 0.00 27.50 7.36 5.94 0.00 30.00 7.36 5.94 0.00 32.50 7.36 5.94 0.00 35.00 7.36 5.94 0.00 37.50 7.36 5.94 0.00 40.00 7.36 5.94 0.00 42.50 7.36 5.94 0.00 45.00 7.36 5.94 0.00 47.50 7.36 5.94 0.00 50.00 7.36 5.94 0.00 52.50 7.36 5.94 0.00 55.00 7.36 5.94 0.00 57.50 7.36 5.94 0.00 60.00 7.36 5.94 0.00 62.50 7.36 5.94 0.00 65.00 7.36 5.94 0.00 67.50 7.36 5.94 0.00 70.00 7.36 5.94 0.00 72.50 7.36 5.94 0.00 75.00 7.36 5.94 0.00 77.50 7.36 5.94 0.00 80.00 7.36 5.94 0.00 82.50 7.36 5.94 0.00 85.00 7.36 5.94 0.00 87.50 7.36 5.94 0.00 90.00 7.36 5.94 0.00 92.50 7.36 5.94 0.00 95.00 7.36 5.94 0.00 97.50 7.36 5.94 0.00 100.00 7.36 5.94 0.00 102.50 7.36 5.94 0.00 105.00 7.36 5.94 0.00 107.50 7.36 5.94 0.00 110.00 7.36 5.94 0.00 112.50 7.36 5.94 0.00 115.00 7.36 5.94 0.00 117.50 7.36 5.94 0.00 120.00 7.36 5.94 0.00 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 94 Summary for Subcatchment 5S: Prop DA-2 [49] Hint: Tc<2dt may require smaller dt Runoff = 97.19 cfs @ 11.95 hrs, Volume= 4.623 af, Depth= 4.80" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=7.36" Area (ac) CN Description 5.240 98 Paved parking, HSG B 6.310 61 >75% Grass cover, Good, HSG B 11.550 78 Weighted Average 6.310 54.63% Pervious Area 5.240 45.37% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Direct Entry Subcatchment 5S: Prop DA-2 Hydrograph ------- -- -- -- -- ---- --- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 95 Hydrograph for Subcatchment 5S: Prop DA-2 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.21 0.00 0.00 5.00 0.46 0.00 0.00 7.50 0.80 0.02 0.26 10.00 1.33 0.16 1.24 12.50 5.41 3.06 7.73 15.00 6.28 3.83 2.33 17.50 6.71 4.21 1.50 20.00 7.01 4.48 1.03 22.50 7.23 4.69 0.92 25.00 7.36 4.80 0.00 27.50 7.36 4.80 0.00 30.00 7.36 4.80 0.00 32.50 7.36 4.80 0.00 35.00 7.36 4.80 0.00 37.50 7.36 4.80 0.00 40.00 7.36 4.80 0.00 42.50 7.36 4.80 0.00 45.00 7.36 4.80 0.00 47.50 7.36 4.80 0.00 50.00 7.36 4.80 0.00 52.50 7.36 4.80 0.00 55.00 7.36 4.80 0.00 57.50 7.36 4.80 0.00 60.00 7.36 4.80 0.00 62.50 7.36 4.80 0.00 65.00 7.36 4.80 0.00 67.50 7.36 4.80 0.00 70.00 7.36 4.80 0.00 72.50 7.36 4.80 0.00 75.00 7.36 4.80 0.00 77.50 7.36 4.80 0.00 80.00 7.36 4.80 0.00 82.50 7.36 4.80 0.00 85.00 7.36 4.80 0.00 87.50 7.36 4.80 0.00 90.00 7.36 4.80 0.00 92.50 7.36 4.80 0.00 95.00 7.36 4.80 0.00 97.50 7.36 4.80 0.00 100.00 7.36 4.80 0.00 102.50 7.36 4.80 0.00 105.00 7.36 4.80 0.00 107.50 7.36 4.80 0.00 110.00 7.36 4.80 0.00 112.50 7.36 4.80 0.00 115.00 7.36 4.80 0.00 117.50 7.36 4.80 0.00 120.00 7.36 4.80 0.00 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 96 Summary for Subcatchment 6S: Prop DA-3 [49] Hint: Tc<2dt may require smaller dt Runoff = 12.04 cfs @ 11.96 hrs, Volume= 0.559 af, Depth= 3.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Type II 24-hr 100-yr Rainfall=7.36" Area (ac) CN Description 0.397 98 Paved parking, HSG B 1.363 61 >75% Grass cover, Good, HSG B 1.760 69 Weighted Average 1.363 77.44% Pervious Area 0.397 22.56% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.0 Direct Entry, Time of Concentration Subcatchment 6S: Prop DA-3 Hydrograph ❑ Runoff 13 12.04 cfs -- -- ------------ -- -- -- -- --------- -- -- -- - -- 12 ---III12 -I-- ----+--+--t--r--r-------+--+--+--+--r--r--Tylpe-ll+2-4-hr_- 11 1 - TI 100-y--Rainfall=�7.361.. - 10 -- - -- --T --- ---I-- -- - -'I-unbff-Atea-1.760-a g _ $ -- - -- -- - -- -- I RQff'I-t�plPM =0:�5�a�f- - w Runoff epth= 1181'r- 7 3 - -- ------L--L----1---1---1--J--1--L--L--L--L--1--- 1--- --L--L--L-- -- 6 TcT5.0 tnih --�----�--�--L--L--L--1---1---1--J--1--L--L--L--L--�---�--L--�--L--L--L-- 5 N=6 4 3 -I--ILI ----------1--7--7--T--r--r-------r--7--T--r--2 r--r----------1-- 7-- 7-- T-- r--r-------1-- 7-- T-- r-- r 1 I 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 97 Hydrograph for Subcatchment 6S: Prop DA-3 Time Precip. Excess Runoff (hours) (inches) (inches) (cfs) 0.00 0.00 0.00 0.00 2.50 0.21 0.00 0.00 5.00 0.46 0.00 0.00 7.50 0.80 0.00 0.00 10.00 1.33 0.04 0.08 12.50 5.41 2.26 1.02 15.00 6.28 2.93 0.32 17.50 6.71 3.28 0.21 20.00 7.01 3.52 0.14 22.50 7.23 3.71 0.13 25.00 7.36 3.81 0.00 27.50 7.36 3.81 0.00 30.00 7.36 3.81 0.00 32.50 7.36 3.81 0.00 35.00 7.36 3.81 0.00 37.50 7.36 3.81 0.00 40.00 7.36 3.81 0.00 42.50 7.36 3.81 0.00 45.00 7.36 3.81 0.00 47.50 7.36 3.81 0.00 50.00 7.36 3.81 0.00 52.50 7.36 3.81 0.00 55.00 7.36 3.81 0.00 57.50 7.36 3.81 0.00 60.00 7.36 3.81 0.00 62.50 7.36 3.81 0.00 65.00 7.36 3.81 0.00 67.50 7.36 3.81 0.00 70.00 7.36 3.81 0.00 72.50 7.36 3.81 0.00 75.00 7.36 3.81 0.00 77.50 7.36 3.81 0.00 80.00 7.36 3.81 0.00 82.50 7.36 3.81 0.00 85.00 7.36 3.81 0.00 87.50 7.36 3.81 0.00 90.00 7.36 3.81 0.00 92.50 7.36 3.81 0.00 95.00 7.36 3.81 0.00 97.50 7.36 3.81 0.00 100.00 7.36 3.81 0.00 102.50 7.36 3.81 0.00 105.00 7.36 3.81 0.00 107.50 7.36 3.81 0.00 110.00 7.36 3.81 0.00 112.50 7.36 3.81 0.00 115.00 7.36 3.81 0.00 117.50 7.36 3.81 0.00 120.00 7.36 3.81 0.00 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 98 Summary for Pond 4P: Wet Pond 1 Inflow Area = 3.130 ac, 73.16% Impervious, Inflow Depth = 5.94" for 100-yr event Inflow = 30.82 cfs @ 11.95 hrs, Volume= 1.550 of Outflow = 10.61 cfs @ 12.07 hrs, Volume= 1.489 af, Atten= 66%, Lag= 7.4 min Primary = 10.61 cfs @ 12.07 hrs, Volume= 1.489 of Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 791.14' @ 12.07 hrs Surf.Area= 12,680 sf Storage= 31,143 cf Plug -Flow detention time= 426.6 min calculated for 1.489 of (96% of inflow) Center -of -Mass det. time= 402.8 min ( 1,183.3 - 780.5 ) Volume Invert Avail.Storage Storage Description #1 788.25' 42,548 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 788.25 8,900 0 0 789.00 9,858 7,034 7,034 790.00 11,185 10,522 17,556 791.00 12,500 11,843 29,398 792.00 13,800 13,150 42,548 Device Routing Invert Outlet Devices #1 Primary 788.25' 24.0" Round Culvert L= 250.0' RCP, square edge headwall, Ke= 0.500 Inlet / Outlet Invert= 788.25' / 787.00' S= 0.0050 T Cc= 0.900 n= 0.013, Flow Area= 3.14 sf #2 Device 1 788.25' 1.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 789.20' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 791.00' 16.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) #5 Secondary 791.50' 20.0' long x 10.0' breadth Broad -Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 Coef. (English) 2.49 2.56 2.70 2.69 2.68 2.69 2.67 2.64 Primary OutFlow Max=10.26 cfs @ 12.07 hrs HW=791.12' (Free Discharge) L1=Culvert (Passes 10.26 cfs of 17.08 cfs potential flow) �2=Orifice/Grate (Orifice Controls 0.04 cfs @ 8.10 fps) 3=Orifice/Grate (Orifice Controls 8.07 cfs @ 6.05 fps) 4=S ha rp-C rested Vee/Trap Weir (Weir Controls 2.15 cfs @ 1.13 fps) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=788.25' (Free Discharge) L5= Broad -crested Rectangular Weir( Controls 0.00 cfs) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 99 '1.71 0 [! Mvivr4a '1•71 0 Hydrograph -J--L-J--L--1--1--1--1--1--1--1--�--L-1--L-J--L--1--L--1--1--1--1-- ,I I I I 30.82 cfs I I L I I 1 I 1 I I I --I I I --+- I I I I I I I I I I -- - --L L 1 _1-- ■Inflow L--1--1--1--1--1--1--1-- --L-1--+L--,J/--L�-r1�--L�}--1--�}1--1--1- ■outflow ■Primary 34 , I - - -- --1-- --1-- --1-- --1-- -���YY �I�a7�-lac-- I I I I ■Secondary 32 -'- J--L--1--1--1--1--1--1--1--�--L-1 I I I L-I - 1--L- -1 -- arc C v= 9I fib' 30 28 -+- +--+--1--+--1--+--1--+--1--+--+- - &ora0F6=3fiy_1 cf - 26 I -+- I +--+--1--+--1--+--1--+--1--+--+-+--+-+- I I I I I I I I I I I 1 -1--+--+--1--+-- I I I I I I I I 24 -1-- --I- - +-- -+-- -+--+- ----1--+--1--�-- 22 -+- +--+--1--+--1--+--1--+--1--+--+-+--+-+--+--1--+--1--+--1--+-- w 20 - - +--+--1--+--1--+--1--+--1--+--+-+--+-+--+--1--+--1--+--1--+-- 18 -+- +--+--1--+--1--+--1--+--1--+--+-+--+-+--+--1--+--1--+--1--+-- 3 o 16 --+----+----+--I-- I I I I I ----1--+- I I I I I --r- --r----+----+----+-- I I I I I I I I I I LL 14 10.61 cfs -- --1--+--1-- --1-- --1-- -- - -- - -- --1----1--+--1-- -- 12 Y--Y----+----Y--I-- --r-Y--r- --r-Y--r----Y----+----Y-- 10 Y--r----t----Y--I-- r- r-Y--r-Y--r----r----t----Y-- $ Y--Y--I--t--I--Y--I--Y--r-Y--r-Y--r-Y--r--I--Y--I--t--I--Y-- 6 4 0.00 cfs 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) 792 791 v v w c 0 R 790 v w 789 Pond 4P: Wet Pond 1 Stage -Discharge 0 5 10 15 20 25 30 35 Discharge (cfs) Total ❑ Primary Secondary Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD® 10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 100 792 791 v v c 0 790 v w 789 Pond 4P: Wet Pond 1 Stage -Area -Storage Surface/HorizontaiMetted Area (sq-ft) 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 Storage (cubic -feet) S Surface ■ Storage Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 101 Hydrograph for Pond 4P: Wet Pond 1 Time Inflow Storage Elevation Outflow Primary Secondary (hours) (cfs) (cubic -feet) (feet) (cfs) (cfs) (cfs) 0.00 0.00 0 788.25 0.00 0.00 0.00 2.50 0.00 0 788.25 0.00 0.00 0.00 5.00 0.08 241 788.28 0.00 0.00 0.00 7.50 0.23 1,579 788.43 0.01 0.01 0.00 10.00 0.61 4,918 788.78 0.02 0.02 0.00 12.50 2.32 24,892 790.63 6.74 6.74 0.00 15.00 0.69 11,656 789.45 0.86 0.86 0.00 17.50 0.44 10,793 789.37 0.49 0.49 0.00 20.00 0.30 10,398 789.33 0.34 0.34 0.00 22.50 0.27 10,202 789.31 0.28 0.28 0.00 25.00 0.00 9,583 789.25 0.11 0.11 0.00 27.50 0.00 9,083 789.21 0.03 0.03 0.00 30.00 0.00 8,854 789.18 0.02 0.02 0.00 32.50 0.00 8,633 789.16 0.02 0.02 0.00 35.00 0.00 8,414 789.14 0.02 0.02 0.00 37.50 0.00 8,198 789.12 0.02 0.02 0.00 40.00 0.00 7,984 789.10 0.02 0.02 0.00 42.50 0.00 7,774 789.07 0.02 0.02 0.00 45.00 0.00 7,566 789.05 0.02 0.02 0.00 47.50 0.00 7,361 789.03 0.02 0.02 0.00 50.00 0.00 7,159 789.01 0.02 0.02 0.00 52.50 0.00 6,960 788.99 0.02 0.02 0.00 55.00 0.00 6,763 788.97 0.02 0.02 0.00 57.50 0.00 6,570 788.95 0.02 0.02 0.00 60.00 0.00 6,379 788.93 0.02 0.02 0.00 62.50 0.00 6,191 788.91 0.02 0.02 0.00 65.00 0.00 6,006 788.89 0.02 0.02 0.00 67.50 0.00 5,824 788.88 0.02 0.02 0.00 70.00 0.00 5,645 788.86 0.02 0.02 0.00 72.50 0.00 5,468 788.84 0.02 0.02 0.00 75.00 0.00 5,295 788.82 0.02 0.02 0.00 77.50 0.00 5,124 788.80 0.02 0.02 0.00 80.00 0.00 4,957 788.79 0.02 0.02 0.00 82.50 0.00 4,792 788.77 0.02 0.02 0.00 85.00 0.00 4,630 788.75 0.02 0.02 0.00 87.50 0.00 4,471 788.74 0.02 0.02 0.00 90.00 0.00 4,315 788.72 0.02 0.02 0.00 92.50 0.00 4,162 788.70 0.02 0.02 0.00 95.00 0.00 4,012 788.69 0.02 0.02 0.00 97.50 0.00 3,865 788.67 0.02 0.02 0.00 100.00 0.00 3,721 788.66 0.02 0.02 0.00 102.50 0.00 3,580 788.64 0.02 0.02 0.00 105.00 0.00 3,442 788.63 0.02 0.02 0.00 107.50 0.00 3,306 788.61 0.01 0.01 0.00 110.00 0.00 3,174 788.60 0.01 0.01 0.00 112.50 0.00 3,045 788.58 0.01 0.01 0.00 115.00 0.00 2,919 788.57 0.01 0.01 0.00 117.50 0.00 2,795 788.56 0.01 0.01 0.00 120.00 0.00 2,675 788.54 0.01 0.01 0.00 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 102 Summary for Pond 5P: Wet Pond 2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth = 4.80" for 100-yr event Inflow = 97.19 cfs @ 11.95 hrs, Volume= 4.623 of Outflow = 48.84 cfs @ 12.06 hrs, Volume= 4.557 af, Atten= 50%, Lag= 6.1 min Primary = 48.84 cfs @ 12.06 hrs, Volume= 4.557 of Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Peak Elev= 781.64' @ 12.06 hrs Surf.Area= 21,857 sf Storage= 82,474 cf Plug -Flow detention time= 348.7 min calculated for 4.556 of (99% of inflow) Center -of -Mass det. time= 342.3 min ( 1,149.0 - 806.8 ) Volume Invert Avail.Storage Storage Description #1 776.50' 90,572 cf Custom Stage Data (Prismatic)Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic -feet) (cubic -feet) 776.50 9,508 0 0 777.00 11,638 5,287 5,287 778.00 13,738 12,688 17,975 779.00 15,894 14,816 32,791 780.00 18,107 17,001 49,791 781.00 20,376 19,242 69,033 782.00 22,702 21,539 90,572 Device Routing Invert Outlet Devices #1 Primary 766.70' 30.0" Round Culvert L= 50.0' Ke= 0.500 Inlet / Outlet Invert= 766.70' / 766.29' S= 0.0082 T Cc= 0.900 n= 0.013, Flow Area= 4.91 sf #2 Device 1 776.50' 1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 778.15' 24.0" W x 8.0" H Vert. Orifice/Grate C= 0.600 #4 Device 1 779.50' 24.0" W x 4.0" H Vert. Orifice/Grate C= 0.600 #5 Device 1 780.75' 12.0' long Sharp -Crested Vee/Trap Weir Cv= 2.62 (C= 3.28) Primary OutFlow Max=48.04 cfs @ 12.06 hrs HW=781.62' (Free Discharge) L1=Culvert (Passes 48.04 cfs of 87.40 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.13 cfs @ 10.83 fps) 3=Orifice/Grate (Orifice Controls 11.37 cfs @ 8.53 fps) 4=Orifice/Grate (Orifice Controls 4.49 cfs @ 6.73 fps) 5=Sharp-Crested Vee/Trap Weir (Weir Controls 32.04 cfs @ 3.06 fps) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 103 Pond 5P: Wet Pond 2 Hydrograph -r--i--r--r--r--i--r--r--r--i--r--r--r-r--r--r--i--r--r--r- ■ Inflow 105 C. S ■ Primary 100 --'-- ---'L--'----L--'-----1L-----Ic�an�'Ae'�'�':55ALa-- 95 --,---+--+----+--+-------+--r-------+--+----+-CI+'--r--�--+��--+-�i--- 90 --,-- -, --,-----,--,--------,--,-----,---�I-Ei���-.`ire-- 85 - - - - - - 80 ---- ---- ---- --------------- -----+--$tPrAg6=827 7 v�i�-- 75 --i-- -r--r----r--r--r----r--r--r----r--r--r-r--r--r----r--r--r-- 70 - - - - -7 T- - - - - - - -- 65 - -- L- -L ------L--1---1--1--L--1-----1--L--1--J--1--L--1----L----- w 60 55 48.84 cfs - --I-- - --1 ---I- - ---- - -- 0 50 -- -'---'---'---'--'---'---'---'--'---'---'---'--'---'---'--'---'---'---'--'---'--- LL 40 -- - r--r --I-- r -- r-----I-- r -- r-----I-- r -- r--I-- r -- r -- r--I-- r -- r--I--- 35 - - - - - - - - - - - -- 30 -- -1--L--1--1--L--1---1--1--L--1---'--1--L--1--J--1--L--1--1--L--,--- 25 -- -+--r--i--+--+--r--i--+--r--r--i--+--r--i--+--+--r--i--+--+--r-- 20 -----r--i--i 15 - --i-----,------r--i - _ _ _ _ _ _ - - -- 10 w 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Pond 5P: Wet Pond 2 Stage -Discharge 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Discharge (cfs) ❑ Primary Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 104 Pond 5P: Wet Pond 2 Stage -Area -Storage Surface/HorizontaiMefted Area (sq-ft) 2,000 4,000 6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000 22,000 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 Storage (cubic -feet) ■ Surface ■ Storage Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 105 Hydrograph for Pond 5P: Wet Pond 2 Time Inflow Storage Elevation Primary (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 776.50 0.00 2.50 0.00 0 776.50 0.00 5.00 0.00 0 776.50 0.00 7.50 0.26 705 776.57 0.01 10.00 1.24 6,302 777.09 0.04 12.50 7.73 64,694 780.78 13.51 15.00 2.33 30,213 778.84 3.71 17.50 1.50 25,754 778.54 1.67 20.00 1.03 24,459 778.46 1.17 22.50 0.92 23,858 778.41 0.96 25.00 0.00 21,786 778.27 0.35 27.50 0.00 20,220 778.16 0.09 30.00 0.00 19,537 778.11 0.07 32.50 0.00 18,880 778.07 0.07 35.00 0.00 18,233 778.02 0.07 37.50 0.00 17,597 777.97 0.07 40.00 0.00 16,970 777.93 0.07 42.50 0.00 16,355 777.88 0.07 45.00 0.00 15,749 777.84 0.07 47.50 0.00 15,154 777.79 0.07 50.00 0.00 14,570 777.75 0.06 52.50 0.00 13,997 777.70 0.06 55.00 0.00 13,434 777.66 0.06 57.50 0.00 12,882 777.62 0.06 60.00 0.00 12,341 777.58 0.06 62.50 0.00 11,812 777.53 0.06 65.00 0.00 11,293 777.49 0.06 67.50 0.00 10,785 777.45 0.06 70.00 0.00 10,289 777.41 0.05 72.50 0.00 9,804 777.38 0.05 75.00 0.00 9,330 777.34 0.05 77.50 0.00 8,868 777.30 0.05 80.00 0.00 8,417 777.26 0.05 82.50 0.00 7,978 777.23 0.05 85.00 0.00 7,550 777.19 0.05 87.50 0.00 7,135 777.16 0.05 90.00 0.00 6,731 777.12 0.04 92.50 0.00 6,339 777.09 0.04 95.00 0.00 5,959 777.06 0.04 97.50 0.00 5,591 777.03 0.04 100.00 0.00 5,235 777.00 0.04 102.50 0.00 4,891 776.97 0.04 105.00 0.00 4,560 776.94 0.04 107.50 0.00 4,241 776.91 0.03 110.00 0.00 3,934 776.88 0.03 112.50 0.00 3,641 776.85 0.03 115.00 0.00 3,360 776.83 0.03 117.50 0.00 3,092 776.80 0.03 120.00 0.00 2,838 776.78 0.03 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 106 Summary for Link 3L: Ex Drainage Areas Inflow Area = 12.850 ac, 4.24% Impervious, Inflow Depth = 3.97" for 100-yr event Inflow = 70.95 cfs @ 12.05 hrs, Volume= 4.252 of Primary = 70.95 cfs @ 12.05 hrs, Volume= 4.252 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 3L: Ex Drainage Areas Hydrograph -- - -- --r--�r------r--�r------rt--�r------7--r--�r------r--�r--�i-- ❑ Inflow 75 70.95 ---'---'------'---'----+---------+---------------'-- ----- - - - - --cT --------,---,-Irtflow-�re12�00-a 'Y_ ❑ Primary cfs - 70 65 � -- -r--r--r--i--r--r--r--i--r--t--r--r--i--r--r--i---i--r--r--r--i-- 60 - 1 - - L - - - - -'- - L - - L - - - - -'- - L - - + - - L - - - - - - - + - - L - - - - -'- - 1 - - L - - L - -'- - 55 - 50 w 45 U 40: - - -7 T- - - F- -T F- - - - o -- -+--+--+-+--+--+--+-+--+--+--+--+-+--+--+----+--+--+--+-+-- 30 25 20 15 10 I- --, --, -- _1 -, r T r -,---,---,--r r --,-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 107 Hydrograph for Link 3L: Ex Drainage Areas Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 0.00 0.00 0.00 7.50 0.00 0.00 0.00 10.00 0.64 0.00 0.64 12.50 10.07 0.00 10.07 15.00 2.42 0.00 2.42 17.50 1.55 0.00 1.55 20.00 1.07 0.00 1.07 22.50 0.95 0.00 0.95 25.00 0.00 0.00 0.00 27.50 0.00 0.00 0.00 30.00 0.00 0.00 0.00 32.50 0.00 0.00 0.00 35.00 0.00 0.00 0.00 37.50 0.00 0.00 0.00 40.00 0.00 0.00 0.00 42.50 0.00 0.00 0.00 45.00 0.00 0.00 0.00 47.50 0.00 0.00 0.00 50.00 0.00 0.00 0.00 52.50 0.00 0.00 0.00 55.00 0.00 0.00 0.00 57.50 0.00 0.00 0.00 60.00 0.00 0.00 0.00 62.50 0.00 0.00 0.00 65.00 0.00 0.00 0.00 67.50 0.00 0.00 0.00 70.00 0.00 0.00 0.00 72.50 0.00 0.00 0.00 75.00 0.00 0.00 0.00 77.50 0.00 0.00 0.00 80.00 0.00 0.00 0.00 82.50 0.00 0.00 0.00 85.00 0.00 0.00 0.00 87.50 0.00 0.00 0.00 90.00 0.00 0.00 0.00 92.50 0.00 0.00 0.00 95.00 0.00 0.00 0.00 97.50 0.00 0.00 0.00 100.00 0.00 0.00 0.00 102.50 0.00 0.00 0.00 105.00 0.00 0.00 0.00 107.50 0.00 0.00 0.00 110.00 0.00 0.00 0.00 112.50 0.00 0.00 0.00 115.00 0.00 0.00 0.00 117.50 0.00 0.00 0.00 120.00 0.00 0.00 0.00 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 108 Summary for Link 7L: POI-1 Inflow Area = 4.890 ac, 54.95% Impervious, Inflow Depth > 5.03" for 100-yr event Inflow = 19.10 cfs @ 11.97 hrs, Volume= 2.048 of Primary = 19.10 cfs @ 11.97 hrs, Volume= 2.048 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 7L: POI-1 Hydrograph ------------------+--------+---------------�-- ❑ Inflow 21 -+--+-+--+--+--+-+--+--+--+--+-+--+--+----+--+--+--+-+-- ❑Primary cfs 20 19.10 --T-----I-- --T--'----T--T-1,`11ffO111�T/� - 19 rea' =�-���,d(, - - - - - - - - - - - - - - 18 -- - --------- --------- --+---------+--------- -- -- ---- 17 -- ---r-----i----+-----i----+--+-------+--r-----i----r--+--i-- 16 - - - - - - - - - - - - 15 14 -' -1--L--1---'--1--L--1---1--J--1--L--1-----+---------1--L-- --'-- 13 -- -rt--r--Ir--li-----r--Ir--li--y--T--Ir--Ir--li--+--r--li---li--rt--r--Ir--li-- 12 ---r 0 10 -- --------- --------- --+---------+--------- -- -- ---- LL 9 -- r--r--r--i--r--r--r--i--r--+--r--r--i--r--r--i---i--r--r--r--i-- $ - - - - - - - - - - - - 6 -- --------- --------- --+---------+--------- -- -- ---- 5 -- -r---------r-------1--T--Ir-------T--r---------r--r---- 4 - - - - - - - - - - - - -- -- -- --------- -- --- --- --------- -----;--- -- --- 2 1 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 109 Hydrograph for Link 7L: POI-1 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 0.00 0.00 0.00 7.50 0.01 0.00 0.01 10.00 0.10 0.00 0.10 12.50 7.77 0.00 7.77 15.00 1.17 0.00 1.17 17.50 0.69 0.00 0.69 20.00 0.48 0.00 0.48 22.50 0.41 0.00 0.41 25.00 0.11 0.00 0.11 27.50 0.03 0.00 0.03 30.00 0.02 0.00 0.02 32.50 0.02 0.00 0.02 35.00 0.02 0.00 0.02 37.50 0.02 0.00 0.02 40.00 0.02 0.00 0.02 42.50 0.02 0.00 0.02 45.00 0.02 0.00 0.02 47.50 0.02 0.00 0.02 50.00 0.02 0.00 0.02 52.50 0.02 0.00 0.02 55.00 0.02 0.00 0.02 57.50 0.02 0.00 0.02 60.00 0.02 0.00 0.02 62.50 0.02 0.00 0.02 65.00 0.02 0.00 0.02 67.50 0.02 0.00 0.02 70.00 0.02 0.00 0.02 72.50 0.02 0.00 0.02 75.00 0.02 0.00 0.02 77.50 0.02 0.00 0.02 80.00 0.02 0.00 0.02 82.50 0.02 0.00 0.02 85.00 0.02 0.00 0.02 87.50 0.02 0.00 0.02 90.00 0.02 0.00 0.02 92.50 0.02 0.00 0.02 95.00 0.02 0.00 0.02 97.50 0.02 0.00 0.02 100.00 0.02 0.00 0.02 102.50 0.02 0.00 0.02 105.00 0.02 0.00 0.02 107.50 0.01 0.00 0.01 110.00 0.01 0.00 0.01 112.50 0.01 0.00 0.01 115.00 0.01 0.00 0.01 117.50 0.01 0.00 0.01 120.00 0.01 0.00 0.01 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 110 Summary for Link 8L: POI-2 Inflow Area = 11.550 ac, 45.37% Impervious, Inflow Depth > 4.74" for 100-yr event Inflow = 48.84 cfs @ 12.06 hrs, Volume= 4.557 of Primary = 48.84 cfs @ 12.06 hrs, Volume= 4.557 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 8L: POI-2 Hydrograph ❑ Inflow -r--1---1--+--+--1---1--+--+--+--1---1--+--+--1---1--+ +--1-- ❑Primary 48.84 cfs irtflow Are -1-1 ! 554 �'1�� - ,1 1 45 1 �--r--r--1--�--r--1---1--�--T--r--r--1--r--r--1---1--1 r--1-- I 40 --'-1--L--1---'--1--L--1---1--J--1--L--1-----1--L--1---'--1 L-- --'-- 35 ,�i --11 ---1r --�,--11---- --1r--11---- --1r --�, --11-- --�r-----11-- --1r --11-- N i I I I I I I I I I I I I I I I I I I I I I I I w 3 I I I I I I I I I I I I I I I I I I I I I 0 25 -- - --------- ---------------------- ---------------- LL I I I I I I I I I I I I I I I I I I I I 1 1 I I I I I I I I I I I I I I I I I I I I I 1 20 1 --r--r--1----r--r--1----T--r--r--1--r--I - --1 1--1--1-- 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 15 --' 1--L--1---'--1--L--1---1--J--1--L--1-----1--L--1---'--1 L-- --'-- 10 -- -r---------Ir--i-------il--i---------r---------Ir --li --I1-- 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 111 Hydrograph for Link 8L: POI-2 Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 0.00 0.00 0.00 7.50 0.01 0.00 0.01 10.00 0.04 0.00 0.04 12.50 13.51 0.00 13.51 15.00 3.71 0.00 3.71 17.50 1.67 0.00 1.67 20.00 1.17 0.00 1.17 22.50 0.96 0.00 0.96 25.00 0.35 0.00 0.35 27.50 0.09 0.00 0.09 30.00 0.07 0.00 0.07 32.50 0.07 0.00 0.07 35.00 0.07 0.00 0.07 37.50 0.07 0.00 0.07 40.00 0.07 0.00 0.07 42.50 0.07 0.00 0.07 45.00 0.07 0.00 0.07 47.50 0.07 0.00 0.07 50.00 0.06 0.00 0.06 52.50 0.06 0.00 0.06 55.00 0.06 0.00 0.06 57.50 0.06 0.00 0.06 60.00 0.06 0.00 0.06 62.50 0.06 0.00 0.06 65.00 0.06 0.00 0.06 67.50 0.06 0.00 0.06 70.00 0.05 0.00 0.05 72.50 0.05 0.00 0.05 75.00 0.05 0.00 0.05 77.50 0.05 0.00 0.05 80.00 0.05 0.00 0.05 82.50 0.05 0.00 0.05 85.00 0.05 0.00 0.05 87.50 0.05 0.00 0.05 90.00 0.04 0.00 0.04 92.50 0.04 0.00 0.04 95.00 0.04 0.00 0.04 97.50 0.04 0.00 0.04 100.00 0.04 0.00 0.04 102.50 0.04 0.00 0.04 105.00 0.04 0.00 0.04 107.50 0.03 0.00 0.03 110.00 0.03 0.00 0.03 112.50 0.03 0.00 0.03 115.00 0.03 0.00 0.03 117.50 0.03 0.00 0.03 120.00 0.03 0.00 0.03 Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 112 Summary for Link 9L: Combined Inflow Area = 16.440 ac, 48.22% Impervious, Inflow Depth > 4.82" for 100-yr event Inflow = 64.81 cfs @ 12.05 hrs, Volume= 6.605 of Primary = 64.81 cfs @ 12.05 hrs, Volume= 6.605 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs Link 9L: Combined Hydrograph ❑ Inflow 70 -i�--,--- li- --- --i-----li -- - i - ❑ Primary 6- 1cfs L -1--L--1--- --L-- - --L L 65 60 ---7--r--I--- 1-- 1-- r--I---I--1--T--r -------T--r-------1--r--r--I-- 55 50- 45 -- - li--i-----,-- li--i --i-----,-- li --i-----,-- li --i-----,-- li--i --i --,-- w40 U 3 35 --, --, --,- --, --, -, --, --, 25 ----r--r---- --r--r----1--T--r--r----T--r-------1--r--r---- L--L-------L--L--L--1--J--1--L--1--J--1--L--1---1--L--L--L--�-- 2015 �i 10 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 Time (hours) Cambridge Village - HydroCAD with ODA Type/1 24-hr 100-yr Rainfall=7.36" Prepared by Bohler Engineering Printed 10/18/2019 HydroCAD®10.00-20 s/n 08311 ©2017 HydroCAD Software Solutions LLC Page 113 Hydrograph for Link 9L: Combined Time Inflow Elevation Primary (hours) (cfs) (feet) (cfs) 0.00 0.00 0.00 0.00 2.50 0.00 0.00 0.00 5.00 0.00 0.00 0.00 7.50 0.02 0.00 0.02 10.00 0.14 0.00 0.14 12.50 21.28 0.00 21.28 15.00 4.88 0.00 4.88 17.50 2.36 0.00 2.36 20.00 1.65 0.00 1.65 22.50 1.36 0.00 1.36 25.00 0.46 0.00 0.46 27.50 0.12 0.00 0.12 30.00 0.10 0.00 0.10 32.50 0.10 0.00 0.10 35.00 0.10 0.00 0.10 37.50 0.09 0.00 0.09 40.00 0.09 0.00 0.09 42.50 0.09 0.00 0.09 45.00 0.09 0.00 0.09 47.50 0.09 0.00 0.09 50.00 0.09 0.00 0.09 52.50 0.09 0.00 0.09 55.00 0.08 0.00 0.08 57.50 0.08 0.00 0.08 60.00 0.08 0.00 0.08 62.50 0.08 0.00 0.08 65.00 0.08 0.00 0.08 67.50 0.08 0.00 0.08 70.00 0.07 0.00 0.07 72.50 0.07 0.00 0.07 75.00 0.07 0.00 0.07 77.50 0.07 0.00 0.07 80.00 0.07 0.00 0.07 82.50 0.07 0.00 0.07 85.00 0.06 0.00 0.06 87.50 0.06 0.00 0.06 90.00 0.06 0.00 0.06 92.50 0.06 0.00 0.06 95.00 0.06 0.00 0.06 97.50 0.06 0.00 0.06 100.00 0.05 0.00 0.05 102.50 0.05 0.00 0.05 105.00 0.05 0.00 0.05 107.50 0.05 0.00 0.05 110.00 0.05 0.00 0.05 112.50 0.05 0.00 0.05 115.00 0.04 0.00 0.04 117.50 0.04 0.00 0.04 120.00 0.04 0.00 0.04 STORM SEWERS ANALYSIS It 0 CL 0- 4) >,.r- o M -j Z 0 0 0 0 1 M Q 0 0 C) CY) V) U-) CD Cl? C) co r- 00 r C) V, W co C) C) C) M C) CL y co 1- 00 r (a U) '4T OD 4) C) C3 C) C) co (D 0 0 C) CD 0 0 C) O O O O C) C) C) C) (D 0 0 C) x cli C14 C14 C� C) C) C) C) (D C) 0 0 C) co C! O O O C) 0 0 C) c 0 C) 0 0 C) N C14 CN C14 ca L) 0 0) 0) 0) 0) IOU (29 OM OM OM C) 0 0 CD Q CD 0 0 C) 0 C! O O O CL 0 (D 0 0 CD CD (D cr < 0 (0 (0 0 (D OR V- C*4 OD Cl) ()� " tl-: 'E (Y) ()0 < Co Q 0 0 C) cj 'r Nr 'IT 'IT CA E CD 0 0 CD Q C� C� C� a m CD CD C) (D 6 Co LO CD LO 0) fll- 0) 0 — CIJ (D 00 CD 0 0 C) C) C) C) C) II Q a 0 CIJ (D < E (D 2 co > (D 0) C Q 0 0 C) N C? LL L) LU (D o S 0 r N m d a_ z —1 z 0 N O 0 0 Z 04 T (6 co 7 E Q E J N LL U N O a` r. 0 �p m m F- AL Cl) E 0 *-I cn > 0 CD cli 0) - 0) LO a) (0 0) r- co CD 0 co 00 (D m 0) C� 0) a) 0) 0) LO co (9 C? OR 00 00 m (11 > 00 00 00 0) 2 w m t- V: U0 00 C? 00 OD 00 00t- 00 00 0) 00f- t- r- 0)h CD 0 ll� ll� C�CD LO (D 00 C\l OD 00 00 0 O LU CD u? CR to co > to 00 to co (D 00 co 00 z S a) cD oo io 0 Iq U') Iq Nt 6 6 N (6 00 N 04 (N (N — O QJ Cl) (Ij ce) > x 0 ON C) 0) CL m 0 oche) C14 (0 (P (7) 7 — C� OI- R 7FD 0 0 CF) 00 fl- 'IT P-: OR OR II co LO LO co O 0 7E CL E cli cl) 0 r-� V N CR F- — — — C) x ch 07 C\l t- ce) Cl? OR 0 C) 0 C) 00 Cl) m U') 0 (D co rl: O� OR ri a 0 0 C) 0 C) 0 (D 9 Cl) t-: Cl) ll� OD ()� F- N C) CI (1) C? C) C? ()LO OD 7 < Lo o 0 CD 0 0E Cl) 4 0 co cli a) I- - 00 (D IT 70 0 C LL7 N M LL co F- J ULu .2 4) o 5 r- il z U) -1 co CD N O 0 0 Cl)Z co LO N m d Z LL a� 'o a` 0- 4) >,.a o M -j Z 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 M_ Q 0 0 C) 0 Q 0 C) 0 0 0 0 0 0 0 0 0 CY) 00 (D m 00 0 cli ce) CD 0 ce) RI a) 0 0 0 Cl) 00 a) C� r-: C� C� tl-: (P O� C� 0 6 N M (P CL r C) w 'IT I- fl- C) co I- w r- C) — — w (D w u) 00 (D 0 M 0 0 0 M M M co " 9 " N N " 9 " C? " 7 7 0 C) C) C) C) C) C) C) C) CD C) CD CD C) C) CD CD CD m 00 co 0 N 0 M CD 0 ce) RI a) 0 0 0 (D m 00 a) O P-: O O tl-: (P 00 O 0 RI M (P CL r C) (D 'IT I- fl- C) co I- co pl, C) r — w w 0 0 (n 0 CD 0 M 0 0 1- 0 M M M 2 " " 9 " N N " 9 " C? " 7 7 Q C) C) C) C) C) C) C) C) C) C) C) C) C) C) CD CD C) co 0 to (D 0 0 C) 0 (D 0 C) 0 0 0 �2 0 0 0 0 0 CD 0 0 C) 0 CD 0 C) 0 0 0 0 0 0 0 0 C! C) O C) O C) O C) O C) C! C) O CD O C) O C) O C) O C) 0, C) O C) O C) O C) O C) O C) r =3 (D 0 0 C) 0 (D 0 C) 0 0 0 0 0 0 0 0 0 C\l 0 C14 C\j C14 C\l 0 C\j C14 cli cli cli C14 C14 cli cli C\j I? O O O O O O (? O O O O C? C? O O C? CD C) C) C) C) C) C) C) C) C) C) C) C) C) CD CD C) (D co (D L) 0 0 0 U-) C) U') 0 U-) (D LO 0 0 C) U') 0 U-) 0 V) 0 V) 0 V) 0 U-) 0 U-) 0 V) 0 V) 0 U-) a l? O O (? C? I? O (? C? O O O (? (? O O (? C) 0 0 C) 0 C) 0 C) 0 0 0 0 0 0 0 0 0 c 0 (D 0 0 C) 0 (D 0 C) 0 0 0 0 0 0 0 0 0 N C) C\j N N cq CD N N N N N C\j C\j N N C\j (a L) 0 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) 0) (29 co Cl/0) Cl/0) Cl/0) (,/U) (1/0) (110) C'no (IOU (IOU Cl/0) (110) Cl/0) (,/U) (110) (110) C'no CD 0 0 C) 0 CD 0 C) 0 0 0 0 0 0 0 0 0 l? C) O C) (? C) (? (D (? C) l? CD O C) (? (D (? CD O CD O CD O C) (? C) (? C) O C) O C) (? C) II Q CD 0 0 C) 0 CD 0 C) 0 0 0 0 0 0 0 0 0 0 .s l? O (? (? (? l? O (? (? O O O (? O O O O 0) C) 0 0 C) 0 C) 0 C) 0 0 0 0 0 0 0 0 0 CL 2 E CD 0 0 CD 0 CD 0 CD 0 0 0 0 0 0 0 0 0 (D cr C) C) C) C) C) C) C) C) C) C) C) CD C) C) CD CD C) (D oq CD 0 0 CD 0 CD 0 CD 0 0 0 0 0 0 0 0 0 Cl) to O O O O O O O O O O O O O O O O< 0 V It "q 1- 0 "q "q I- 1- 0 "q "q I- I- "q Q 0 0 a 0 a 0 a 0 0 0 0 0 0 0 0 0 I 'r C) 'IT 'IT + (D m m E CL -2 .2 .2 -2 -2 .0 .0 .0 .2 .2 .2 .2 C) C) C) U 0 C) 0 0 C) C) U 0 U C) O CD o o CD o CD o CD CD C! C� C� C� C� C! C� C� C� C� C� C� C� C� C� C� C� do C) C) C) C) C) C) C) C) CD CD CD CD CD CD C) C) C) CD LO 0 (0 LO (0 cli 0 00 It N 0 m r- (0 1- 0) 0) Q. 9 CR (? O) O C? C? N C? 09 tl-: CA m C� 0 0 C) 0 CD 0 — — — 0 0 — C\J 0 0 (D 00 V) CD 0 0 CD 0 CD 0 CD 0 0 0 0 0 0 0 0 0 11 Q C) C) C) C) C) C) C) C) C) C) CD CD CD CD CD CD C) Q 0 CO U') CO N 0 co C) ce) r- O 09 U? C) O 0) O 00 a N0 0 C) 0 C) 0 — — — 0 0 0 0 rO (D 11 co E (D 2 co 0) 17 O O z NC �:Ooc)oc)oc) -E N C? 'T L9 T '� C9 z m mcomcomco m m m m m m m m m IL L) LU A) (D ff o .r o N m It m 0 rl- co (3) 0- z —1 z I I co CD N O 0 0 Cl)Z co LO N m d Z LL a� 'o a` r. 0 �p m m F- Cl) E 0 *-I cn - — — — — — — — — — N— L— N— L— <— co co U) co U) co co co co co co co co co co co U) IX) 0 to CD N to a 00 CO 00 F� > Q C9 U; I U? G� cl� U? U? r-: w NN " m co co Iq co It U) (0 fll- U) co co co 00 00 00 00 w 00 00 00 00 00 00 00 00 00 co 00 00 co LO (0 LO C) N LO a LO N CD M to V- V- m (D to LO m (11 m to O O O cli V) a) N 00 N co N 00 N 00 N 00 co co 6 00 C6 00 4 00 N 00 4 co to 00 6 00 6 00 4 co 6 00 6 00 I- o) 0 CIJ CD N V LO (0 N. LO CD 1- 00 0 MU) U? Cl? 00 0) a) a 0 (D Cl) 0 (D 0 N 0 r- t- co co co lb 00 co co co co 00 00 > 2 w It LO Cl) 0 U-) CD (D U) (0 0) t- CD U-) LO a) C? (P V) V: (P 00 0) r 7 V: (P O MI) co co 0) CD 0 Q 0 (0 0 a 0 N 0 t- P- co co co co tb co co co co co co co N CD C CD 00 CD (D I,- (D Iq (D CD t- 00 C) uj 09 N tl� O V: C! V C) O (P I? (P O C? I? " V) a) 'IT U) LO (D (D fl- I- r- co co 0) 0) N 0 0) 0) 00 co 00 00 LU 00 LO CIJ 0 M a M CO P- fl- LO CD P- N CO O u? CR U? 7 U? <p 7 t-: 7 <p t,-: 7 7 V: V- LO Lo (D (D r- r- (11 co co m M CO M M z a LO 0 a M 0 a a CD 0 a M CD N N 0 U') cli LO U') V LO Lo U') to LO Lo V to LO LO a O O O o U*) V V V U*) ul V 00 U') IL N N N N N N N N N — N (N 04 r r (N — — (D Iq I- CD 00 0) 0) Lf) 04 0 LO 00 CY) CY) CV) Lr) 0 9 C'? (P U? " ()0 ',I: — U? (? 00 t,� U? V: 00 Z (0 to (0 Cl) Cl) (Ij N N CO M CO V V V r 0 > x Cl) LO M M (D r- OD Ce) P- U') 0) Ce) 0 CO 0 CL C? 19 (9 1'-: (3) Lo h t-: 1'-: 0) 00 ()R 00 0 II m 0 a 0 (D 0 0 4 0 a 0 a C14 C14 CN N C14 CN CN N C14 N tl t- m rl- Cl) r- N— N LO q C) U) 7FD 00) C0 00 r-: CR '7 (PO r9 LnV) c? II N r M 1- (0 — W W CO M CO — — L to (9 cq CR (3) N 9 1p 0) 9 9 9 0) 9 9 11 LO Lo LO (,0 O O f- (D (D t- f- r- w t- t- O fl- W 06 6 6 C9 M 09 Cl? 9 09 (9 N 9 9 V: C? C? CY) 0) 00 00 Lo LO U') LO Lo LO LO LO L() (D 0 (D 0 C) 0 (D 0 0 C) 0 (D 0 C) 0 (D 0 0 0 7E ui C5 L6 6 ui to ci ui 6 ui ui C5 6 6 L6 vi vi E LO M N 0 7 (9 O OR r-: to N O O "14: U? to N Q F- ce) ce) — — — — — C) r r C3 (D CD CD CD CD x ce) CD N V V Cl) C) N (0 Cl) CV) 0 Cl) N CD a) 00 f '=! " 7 " O M " M " O ": f c? 7 0 C) 0 C) 0 C) 0 0 C) 0 C) 0 C) 0 C) 0 0 47- V CD m 0 ce) LO C) (0 lqr 04 LO C) LO It " a) 0 4) rl-: C! OO tl-: 09 00 O rl-: CR 09 00 O OR rl� (P (P 0 0 C) 0 C) 0 C) 0 0 C) 0 C) 0 C) 0 C) 0 0 0 (D U? LO CR h (9 co L9 Lf) C? (D 9 a) P-: C%j V)M 00 09 00 V: C 0) P- 41 F- LO V V (N N (N — — C) — — — CD CD CD CD C3 CD W W M r- 0 N 0 r- 0 0 00 V: Mco o 0 CD 0 (D 0 CD 0 0 00 CD 0 (D 0 CD 0 0 0 CD Z� ce) 0 a q o CD 00t- 0 co (o lq- (D ce) Ejn 00 00 a7 00 (c! 00 C\l 00 C%� Q (0 0� 0 C� C) �2 Q Cl? !�2 ce) r-: "T Lb Cl? m Cl) Ce) 32:1 11 (1) (Ij Ce) LO OD 9 0) LO 9 CD . 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C 9 CD 9 C 9 C) (9 F- h h t- f- C) C) C) C) C) C) P- -E C C) 0 CD C C) 0 C CD C C) 0 V O O O O O O O O O O O 0 CD 0 (; 0 CD 0 0 C) 0 t- Cl) CO m It cq Nt Lo F LO (o 00 Lq Lq (q CO a) C) 0 co T Lo LO a C\j r- CD r- Cl) 00 I- LO L6 C� a) M00 a) 0 z 0 C N Cl) 'IT LO CD Fl- co m 'cr F- i LU A) .2 ff 0 m 't to 0 r- co 0) 0- z (n -j - I I RIP RAP & DITCH CALCULATIONS Channel Report Hydraflow Express Extension for Autodesk0 AutoCADO Civil 3DO by Autodesk, Inc. <Name> Trapezoidal Bottom Width (ft) = 4.00 Side Slopes (z:1) = 4.00, 4.00 Total Depth (ft) = 1.00 Invert Elev (ft) = 785.00 Slope (%) = 4.00 N-Value = 0.025 Calculations Compute by: Known Q Known Q (cfs) = 10.69 Elev (ft) 787.00 786.50 786.00 785.50 785.00 784.50 0 2 4 6 Section 8 Reach (ft) Monday, Oct 28 2019 Highlighted Depth (ft) = 0.38 Q (cfs) = 10.69 Area (sqft) = 2.10 Velocity (ft/s) = 5.09 Wetted Perim (ft) = 7.13 Crit Depth, Yc (ft) = 0.51 Top Width (ft) = 7.04 EGL (ft) = 0.78 10 12 14 Depth (ft) 2.00 1.50 1.00 0.50 1 -0.50 16 Channel Report Hydraflow Express Extension for Autodesk0 AutoCADO Civil 3DO by Autodesk, Inc. <Name> Trapezoidal Bottom Width (ft) = 2.00 Side Slopes (z:1) = 4.00, 4.00 Total Depth (ft) = 1.00 Invert Elev (ft) = 785.00 Slope (%) = 4.00 N-Value = 0.025 Calculations Compute by: Known Q Known Q (cfs) = 13.68 Elev (ft) Section 787.00 786.50 786.00 785.50 785.00 784.50 Highlighted Depth (ft) Q (cfs) Area (sqft) Velocity (ft/s) Wetted Perim (ft) Crit Depth, Yc (ft) Top Width (ft) EGL (ft) Monday, Oct 28 2019 = 0.55 = 13.68 = 2.31 = 5.92 = 6.54 = 0.73 = 6.40 = 1.10 Depth (ft) 2.00 1.50 1.00 0.50 ■rzff.i 1 2 3 4 5 6 7 8 9 10 11 12 v Reach (ft) TEMPORARY SKIMMER BASIN CALCULATIONS Skimmer Basin #1 Okay 6.59 Disturbed Area (Acres) 15.81 Peak Flow from 10-year Storm (cfs) 11862 Required Volume W 5138 Required Surface Area ft2 50.7 Suggested Width ft 101.4 Suggested Length ft 82 Trial Top Width at Spillway Invert ft 125 Trial Top Length at Spillway Invert ft 3 Trial Side Slope Ratio Z:1 4 Trial Depth ft (2 to 3.5 feet above grade) 58 Bottom Width ft 101 Bottom Length ft 5858.00 Bottom Area ft2 31832 Actual Volume W Okay 10250 Actual Surface Area ft2 Okay 14 Trial Weir Length ft 1 Trial Depth of Flow ft 42.0 Spillway Capacity cfs Okay 8 Skimmer Size (inches) Skimmer Size 0.5 Head on Skimmer (feet) (inches) 1.75 Orifice Size (1/4 inch increments) 2.37 Dewatering Time (days) Suggest about 3 days Skimmer Basin #2 Okay 1.12 Disturbed Area (Acres) 2.69 Peak Flow from 10-year Storm (cfs) 2016 Required Volume W 1170 Required Surface Area ft2 24.2 Suggested Width ft 48.4 Suggested Length ft 37 Trial Top Width at Spillway Invert ft 66 Trial Top Length at Spillway Invert ft 3 Trial Side Slope Ratio Z:1 4 Trial Depth ft (2 to 3.5 feet above grade) 13 Bottom Width ft 42 Bottom Length ft 546 Bottom Area ft2 5592 Actual Volume ft3 Okay 2442 jActual Surface Area ft2 Okay 5 Trial Weir Length ft 0.5 Trial Depth of Flow ft 5.3 Spillway Capacity cfs Okay 1.5 Skimmer Size (inches) Skimmer Size 0.125 Head on Skimmer (feet) (Inches) 1 Orifice Size (1/4 inch increments) 1.5 2.47 Dewatering Time (days) 2 Suggest about 3 days 2.5 3 4 5 6 8 Skimmer Basin #3 Okay 4 Disturbed Area (Acres) 9.6 Peak Flow from 10-year Storm (cfs) 7200 Required Volume W 3120 Required Surface Area ft2 39.5 Suggested Width ft 79.0 Suggested Length ft 80 Trial Top Width at Spillway Invert ft 154 Trial Top Length at Spillway Invert ft 3 Trial Side Slope Ratio Z:1 3 Trial Depth ft (2 to 3.5 feet above grade) 62 Bottom Width ft 136 Bottom Length ft 8432 Bottom Area ft2 30966 Actual Volume W Okay 12320 Actual Surface Area ft2 Okay 12 Trial Weir Length ft 0.5 Trial Depth of Flow ft 12.7 Spillway Capacity cfs Okay 3 Skimmer Size (inches) Skimmer Size 0.25 Head on Skimmer (feet) (inches) 1.5 Orifice Size (1/4 inch increments) 2.77 Dewatering Time (days) Suggest about 3 days