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HomeMy WebLinkAboutDrainage Report 10505 North College Avenue | Indianapolis, IN 46280 | .www.weihe.net | (317) 846-6611 | (800) 452-6408 | Fax: (317) 843-0546 Allan H. Weihe, P.E., L.S., - Founder PRELIMINARY STORMWATER TECHNICAL REPORT For: COTTAGES AT CARMEL 14220 Larson Drive Carmel, Hamilton County Indiana Project #W22-0131 Prepared for: Advenir Oakley Development, LLC 17501 Biscayne Boulevard, Suite 300 Aventura, FL 33160 Telephone (305) 450-8233 Contact: Scott Weathers E-mail: sweathers@adveniroakleycapital.com Prepared By: Travis P. Gaither, P.E. Checked By: Rick M. Ellis Certified By: Travis P. Gaither, P.E. Date: June 14, 2023 Revised: July 18, 2023 Stormwater Technical Report Prepared For: Gateway Park Apartments Hancock County, IN Project #W22-0628 TABLE OF CONTENTS 1. Project Narrative a. Project Overview b. Pre-Developed Conditions c. Post-Developed Conditions d. Water Quality e. Exhibits 2. Compliance with Master Plan a. CN Calculations b. Excerpts from previous Legacy Reports 3. Pipe Sizing Calculations a. Exhibits b. Support Calculations c. Hydraflow Reports d. Inlet Capacity Calculations PROJECT NARRATIVE Cottages at Carmel Weihe Engineers, INC. 7/18/2023 Preliminary Stormwater Technical Report Prepared For: Cottages at Carmel Carmel, IN Project #W22-0131 Project Overview: Advenir Oakley Development, LLC is proposing to build a new multi-family housing development with various housing products, a club house with pool, parking lots, sidewalks and additional amenities on approximately 30.74 acres. A 2.36 acre parcel in the northeast corner of the site will be planned for future commercial development. The project is located south of 146th Street, between River Road and Cherry Tree Road. The project is a part of the larger overall development named “Legacy”. Detention and water quality has been provided as a part of the overall development. This drainage report will show that the Cottages of Carmel project adheres to the master plan of the overall detention and water quality and will contain calculations for the onsite storm sewer system. The proposed construction is on a site at a Latitude of N 40° 00' 59" and Longitude W 86° 03' 44". The multi-family site is located in the Northwest Quarter of Section 23, Township 18 North, Range 4 East, situated in Clay Township, Hamilton County, Indiana. Please refer to Figure 1.1. Floodzone: Based upon a scaled interpretation of the Flood Insurance Map, No.18057C0143G and 18057C0231G for Hamilton County, Indiana, dated November 19, 2014, the subject tract IS NOT located within Zone AE (Special Flood Hazard Area inundated by 100-year flood-Base Flood Elevations determined) or Floodway Area in Zone AE. Refer to Figure 1.2. Cottages at Carmel Weihe Engineers, INC. 7/18/2023 Pre-Developed Conditions: Aerial photography was used to illustrate the current land-use of the parcel. Currently, the property has been previously graded as a part of the overall Legacy project. It has since been covered with unmaintained trees and tall grass. The project site is directly adjacent to 146th Street and residential developments to the north, and existing residential and commercial developments as a part of the overall Legacy project to the east, west, and south. Please refer to Figure 1.3. The majority of the site currently drains to the south onto the adjacent Windward at Legacy project where runoff is collected by stormwater infrastructure at various locations and routed to the south and east. The site is a part of the White River watershed. Please refer to Figure 2.1. The property consists of the following soil types: Fox Loam, Hennepin Loam, Sleeth Loam, Westland Silty Clay Loam, Fox Loam-Urban Land Complex, Ockley Silt Loam- Urban Land Complex, Sleeth Loam-Urban Land Complex, Westland Silty Clay Loam- Urban Land Complex. A soil map has been included with this report. An abbreviated NRCS Soils Report has been included with this report. Cottages at Carmel Weihe Engineers, INC. 7/18/2023 Post-Developed Conditions: The development will be a multi-family housing complex with amenities for the residents and a future commercial development(s). The overall Legacy development has accounted for the detention and water quality requirements for this development. The site lies within the East Watershed as defined in the overall Legacy Drainage Report approved October 5, 2012. Portions of the Overall Legacy Drainage Report are in Section 2 of this report. It is within BAS 122 and BAS 129 as shown on Figure 6 of the Legacy report. Detention and water quality will be provided by features CW1, VS6, and DD6 as shown in Figure 6. The master planned CNs for BAS 122 and BAS 129 is 94 with a time of concentration of 5 minutes. The layout of the subject site results with a CN of 91.7, adhering to the master plan. See Figures 2.1 and 2.2 for existing and proposed conditions exhibits. Storm Sewers The storm sewer system is designed to meet City of Carmel Standards. Pipes shall convey stormwater at a minimum velocity of 2.5 feet/second through reinforced concrete pipes while maintaining a hydraulic grade line elevation below the top of castings during a 10-year storm event. Proposed storm sewers have been master planned to convey future undetained runoff from the commercial parcel in the northeast corner. Proposed pipe systems will connect to existing infrastructure at 4 locations. 2 of these locations are north of Equality Blvd., east of James Dean Dr., 1 is on the east site of the terminus point of James Dean Dr., and 1 is in Common Area 22 of the Windward of Legacy project, between James Dean Drive and Larson Dr. Only 1 of these 4 connection points have been designed for developed runoff from the subject site, therefore, a by-pass storm network has been designed on the west side of Larson Dr. to not overload the Windward at Legacy storm systems. The by- pass system discharges into a dry detention basin on the south side of the Windward at Legacy development. Portions of the Windward at Legacy drainage report dated February 10, 2021, has been provided in Section 2 of this report. Windward structure EX 674 is the easternmost connection point and was planned to receive an undeveloped flow of 6.85 cfs. However, the pipe system was designed with extra capacity and as-builts show that the pipes were constructed steeper than the design, therefore, an additional 6.67 cfs of capacity can be accounted for in the existing pipes. This results in 13.52 cfs of available capacity in EX 674. The proposed calculations have 11.37 cfs draining to EX 674. Windward structure EX 656 was designed to be the next connection point west of EX 674, but it will be removed and the connection point will become EX 655. EX 656 was designed to receive a developed flow of 23.84 cfs. Proposed calculations have 22.87 cfs of flow draining to EX 655. Cottages at Carmel Weihe Engineers, INC. 7/18/2023 Windward structure EX 644 was designed to accept undeveloped runoff west of James Dean Dr. at a rate of 13.49 cfs. The actual connection point will be at EX 641, with EX 644 still being used to accept some developed surface flow. Additionally, EX 640 will also accept some developed surface flow from the subject site. The design proposed flow from the subject site entering this existing system is 12.64 cfs. Windward structure EX 619 was designed to accept undeveloped runoff east of Larson Dr. at a rate of 8.67 cfs. The actual connection pont will be at EX 617, with EX 619 still being used to accept some developed surface flow. The design proposed flow from the subject site entering this existing system is 4.88 cfs. The proposed by-pass storm sewer system west of Larson Dr. will convey 29.28 cfs of flow through a 42” RCP. All storm runoff passing through Windward at Legacy will enter 1 of 2 dry detention basins that have been sized to handle the developed flow from the subject site. Refer to Section 3 for the pipe sizing calculations and Figures 3.1-3.5 for the Pipe Sizing Basin Maps. LOCATION MAP Date: June 14, 2023FIGURE 1.1 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S PROJECT LOCATION COTTAGES AT CARMEL CARMEL, IN FEMA MAP Date: June 14, 2023FIGURE 1.2 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S PROJECT LOCATION COTTAGES AT CARMEL CARMEL, IN AERIAL MAP Date: June 14, 2023FIGURE 1.3 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S PROJECT LOCATION COTTAGES AT CARMEL CARMEL, IN Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4/17/2023 Page 1 of 344278904427950442801044280704428130442819044282504427890442795044280104428070442813044281904428250580980581040581100581160581220581280581340581400581460581520581580 580980 581040 581100 581160 581220 581280 581340 581400 581460 581520 581580 40° 0' 2'' N 86° 3' 5'' W40° 0' 2'' N86° 2' 38'' W39° 59' 49'' N 86° 3' 5'' W39° 59' 49'' N 86° 2' 38'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 16N WGS84 0 100 200 400 600 Feet 0 40 80 160 240 Meters Map Scale: 1:2,940 if printed on A landscape (11" x 8.5") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:15,800. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Hamilton County, Indiana Survey Area Data: Version 23, Sep 3, 2022 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jun 15, 2022—Jun 21, 2022 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. Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4/17/2023 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI FnB2 Fox loam, 2 to 6 percent slopes, eroded 5.0 16.5% HeF Hennepin loam, 18 to 50 percent slopes 1.2 3.9% St Sleeth loam 5.6 18.4% We Westland silty clay loam, 0 to 2 percent slopes 14.4 47.1% YflB2 Fox loam-Urban land complex, 2 to 6 percent slopes, eroded 0.0 0.1% YoxA Ockley silt loam-Urban land complex, 0 to 2 percent slopes 4.0 13.1% YsnA Sleeth loam-Urban land complex, 0 to 2 percent slopes 0.1 0.2% YwqA Westland silty clay loam-Urban land complex, 0 to 2 percent slopes 0.2 0.7% Totals for Area of Interest 30.5 100.0% Soil Map—Hamilton County, Indiana Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 4/17/2023 Page 3 of 3 COMPLIANCE WITH MASTER PLAN FIGURE 2.1 EXISTING CONDITIONS EXHIBIT Date: June 14, 2023 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S COTTAGES AT CARMEL CARMEL, IN FUTUREDEVELOPMENTFIGURE 2.2 PROPOSED CONDITIONS EXHIBIT Date: July 18, 2023 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S COTTAGES AT CARMEL CARMEL, IN EX 674CONNECTIONEX 655CONNECTIONEX 641CONNECTIONEX 619CONNECTION42" BY-PASSSYSTEM Basin Type of Cover/Percent Weighted Name A B C D Condition of Cover of Basin A B C D CN SITE 0% 0% 0% 100% Impervious 65% 98 98 98 98 98.0 0% 0% 0% 100% Open Space, Good Cond. 35% 39 61 74 80 80.0 SITE 100%91.7 Prepared By:TPG Soil Group % Curve Number (CN) Job No.:W22-0131 Proposed Conditions Checked By:RME Weighted Curve Project:Cottages at Carmel Number Calculations Date:6/14/2023 PIPE SIZING CALCULATIONS OHU6040.56 AC6050.64 AC6060.28 AC6070.35 AC6080.43 AC6090.48 AC0.97 AC6220.13 AC6240.50 AC6250.21 AC6260.09 AC6270.10 AC6280.20 AC6290.77 AC6300.27 AC6310.32 AC0.35 AC6350.54 AC6420.07 ACEX 6190.27 AC 6440.18 AC6450.23 ACFIGURE 3.1 STORM INLET BASIN MAP Date: July 18, 2023 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S COTTAGES AT CARMEL CARMEL, IN 6100.97 AC6110.54 AC6120.27 AC6130.40 AC6140.40 AC6150.14 AC6160.07 AC6170.04 AC0.04 AC6320.41 AC6330.46 AC6340.38 AC6360.35 AC0.24 AC6380.25 AC6390.30 AC6400.31 AC6410.40 AC6420.07 AC6450.23 AC6510.41 AC6520.53 AC0.80 ACEX 6420.11 ACEX 6440.61 AC 6460. 0 5 A C6480.59 AC6490.61 AC6500.33 AC6530.10 AC6540.09 AC6550.19 AC6580.23 ACFIGURE 3.2 STORM INLET BASIN MAP Date: July 18, 2023 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S COTTAGES AT CARMEL CARMEL, IN 6150.14 AC6160.07 AC6170.04 AC6180.04 AC6190.40 AC6200.71 AC6370.24 AC6380.25 AC6390.30 AC6400.31 AC6410.40 ACEX 6410.80 ACEX 6420.11 AC6460.05 AC6486550.19 AC6560.29 AC6571.18 AC6580.23 AC6600.16 AC6610.54 AC6640.37 AC6650.34 AC6660.05 AC6670.44 AC6680.75 AC6690.61 AC 6700.28 AC6720.54 AC6730.19 ACEX 6720.43 AC0.08 AC6810.49 ACFIGURE 3.3 STORM INLET BASIN MAP Date: July 18, 2023 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S COTTAGES AT CARMEL CARMEL, IN 6156160.07 AC6170.04 AC6180.04 AC6190.40 AC6200.71 AC6370.24 AC6400.31 AC641EX 6400.18 ACEX 6410.80 ACEX 6420.11 AC6 4 6 0. 0 5 A C6550.19 AC6560.29 AC6571.18 AC6580.23 ACEX 6550.21 AC6590.10 AC6600.16 AC6610.54 AC6640.37 AC6650.34 AC6660.05 AC6670.44 AC6680.75 AC6700.28 AC6720.54 AC6730.19 ACEX 6720.43 ACEX 6740.08 AC6810.49 ACFIGURE 3.4 STORM INLET BASIN MAP Date: July 18, 2023 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S COTTAGES AT CARMEL CARMEL, IN FUTUREDEVELOPMENT 6610.54 AC6640.37 AC6650.34 AC6660.05 AC6680.61 AC 6730.19 AC6740.52 AC6750.47 AC6762.57 ACEX 6720.43 ACEX 6740.08 AC6780.07 AC 6770.31 AC6790.47 AC6800.30 AC6810.49 AC6820.87 AC6840.62 AC6850.41 AC6830.11 AC FIGURE 3.5 STORM INLET BASIN MAP Date: July 18, 2023 WEIHE weihe.net Indianapolis, Indiana 46280 10505 N. College Avenue 317 | 846 - 6611E N G I N E E R S COTTAGES AT CARMEL CARMEL, IN Project: Date: Job No.: Checked By: Prepared By: Str. # Total Total Impervious Total Pervious Composite Drainage Area Area "c" Value Area, At Aimp Aper (acre) (acre) (acre) Cw 604 0.56 0.04 0.51 0.25 605 0.64 0.04 0.59 0.24 606 0.28 0.25 0.03 0.78 607 0.35 0.25 0.10 0.66 608 0.43 0.29 0.14 0.64 609 0.48 0.32 0.16 0.63 610 0.97 0.69 0.28 0.66 611 0.54 0.42 0.12 0.71 612 0.27 0.14 0.13 0.53 613 0.40 0.28 0.11 0.66 614 0.40 0.27 0.13 0.64 615 0.14 0.05 0.08 0.45 616 0.07 0.06 0.02 0.69 617 0.04 0.04 0.00 0.82 618 0.04 0.03 0.02 0.60 619 0.40 0.30 0.11 0.68 620 0.71 0.55 0.16 0.70 622 0.13 0.13 0.00 0.85 624 0.50 0.34 0.15 0.65 625 0.21 0.14 0.07 0.64 626 0.09 0.08 0.02 0.74 627 0.10 0.08 0.02 0.74 628 0.20 0.14 0.06 0.67 629 0.77 0.01 0.76 0.21 630 0.27 0.22 0.05 0.72 631 0.32 0.25 0.07 0.71 632 0.41 0.33 0.08 0.72 633 0.46 0.37 0.09 0.72 634 0.38 0.12 0.26 0.40 635 0.54 0.15 0.40 0.38 636 0.35 0.09 0.26 0.37 637 0.24 0.18 0.06 0.69 638 0.25 0.21 0.04 0.75 639 0.30 0.18 0.12 0.58 640 0.31 0.20 0.11 0.62 641 0.40 0.32 0.08 0.72 642 0.07 0.02 0.05 0.36 EX 619 0.27 0.10 0.17 0.44 644 0.18 0.13 0.05 0.67 645 0.23 0.20 0.03 0.76 651 0.41 0.31 0.10 0.69 Value Calculations Composite "c" RME TPG Cottages at Carmel 7/18/2023 W22-0131 Project: Date: Job No.: Checked By: Prepared By: Str. # Total Total Impervious Total Pervious Composite Drainage Area Area "c" Value Area, At Aimp Aper (acre) (acre) (acre) Cw Value Calculations Composite "c" RME TPG Cottages at Carmel 7/18/2023 W22-0131 652 0.53 0.38 0.16 0.66 EX 640 0.18 0.09 0.09 0.51 EX 641 0.80 0.50 0.30 0.61 EX 642 0.11 0.09 0.02 0.72 EX 644 0.61 0.22 0.39 0.43 646 0.05 0.04 0.01 0.69 648 0.59 0.39 0.20 0.63 649 0.61 0.41 0.21 0.63 650 0.33 0.23 0.09 0.67 653 0.10 0.08 0.02 0.73 654 0.09 0.08 0.01 0.75 655 0.19 0.14 0.05 0.68 656 0.29 0.12 0.17 0.47 657 1.18 0.60 0.58 0.53 658 0.23 0.16 0.08 0.64 0.00 EX 655 0.21 0.09 0.12 0.47 659 0.10 0.05 0.06 0.49 660 0.16 0.06 0.10 0.44 661 0.54 0.39 0.15 0.67 664 0.37 0.29 0.08 0.71 665 0.34 0.25 0.10 0.66 666 0.05 0.04 0.01 0.78 667 0.44 0.31 0.13 0.66 668 0.75 0.53 0.22 0.66 669 0.61 0.23 0.38 0.45 670 0.28 0.23 0.05 0.73 672 0.54 0.39 0.15 0.67 673 0.19 0.13 0.06 0.66 674 0.52 0.41 0.12 0.70 675 0.47 0.35 0.12 0.69 676 2.57 2.15 0.42 0.74 EX 672 0.43 0.34 0.09 0.71 EX 674 0.08 0.04 0.05 0.49 677 0.31 0.27 0.04 0.76 678 0.07 0.05 0.02 0.66 679 0.47 0.38 0.09 0.73 680 0.30 0.25 0.04 0.76 681 0.49 0.30 0.19 0.60 682 0.87 0.71 0.16 0.73 Project: Date: Job No.: Checked By: Prepared By: Str. # Total Total Impervious Total Pervious Composite Drainage Area Area "c" Value Area, At Aimp Aper (acre) (acre) (acre) Cw Value Calculations Composite "c" RME TPG Cottages at Carmel 7/18/2023 W22-0131 683 0.11 0.09 0.01 0.79 684 0.62 0.51 0.10 0.74 685 0.41 0.23 0.18 0.56 Shallow Conc Flow Travel Time: Channel Flow Travel Time: Short Grass 0.15 Grass 0.03 Dense Grass 0.24 Concrete 0.015 Shallow Conc Flow (Unpaved): Pavement 0.011 Rip-Rap 0.035 Shallow Conc Flow (Paved): 2 Yr, 24 Hr Rainfall= 2.66 Overland Flow Travel Time: Tc minimum= 5 Paved Gutter & Channel Flow Tc Basin Len S n T_t Len S n T_t Len S Pave/Un Vel T_t Len A Pw r S n Vel T_t (ft)%(min)(ft)%(min)(ft)%P or U (ft/s)(min)(ft)(sf)(ft)(ft)%(ft/s)(min)(min) PR-619 46 1.00 0.24 11 0 160 1.00 P 2.03 1 170 4.00 1 13.1 PR-644 62 1.00 0.24 14 0 52 2.00 P 2.87 0 416 5.00 1 15.8 PR-656 47 1.00 0.24 11 0 50 2.08 P 2.93 0 957 5.00 3 14.8 PR-674 30 1.00 0.24 8 0 0 1.00 P 2.03 0 480 4.00 2 9.9 PR-BYP 95 1.50 0.24 17 0 0 1.00 P 2.03 0 2000 5.00 7 23.5 604 25 4.00 0.24 4 75 24.00 0.24 5 205 1.00 U 1.61 2 0 10.6 605 33 3.00 0.24 5 67 18.00 0.24 5 188 1.00 U 1.61 2 0 12.1 606 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 607 52 1.70 0.24 10 0 0 1.00 P 2.03 0 0 9.9 608 40 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.9 609 40 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.9 610 41 1.30 0.24 9 0 0 1.00 P 2.03 0 0 9.1 611 65 1.00 0.24 15 0 0 1.00 P 2.03 0 0 14.6 612 35 2.00 0.24 7 0 0 1.00 P 2.03 0 0 6.8 613 38 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.5 614 40 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.9 615 70 2.00 0.24 12 0 0 1.00 P 2.03 0 0 11.8 616 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 617 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 618 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 619 38 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.5 620 42 1.00 0.24 10 0 103 1.00 P 2.03 1 0 11.2 622 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 624 39 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.7 625 39 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.7 626 12 1.00 0.24 4 0 0 1.00 P 2.03 0 0 5.0 627 12 1.00 0.24 4 0 0 1.00 P 2.03 0 0 5.0 628 23 1.00 0.24 6 0 0 1.00 P 2.03 0 0 6.4 629 24 4.50 0.24 4 76 11.20 0.24 6 120 1.00 U 1.61 1 0 11.2 630 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 Channel Flow Overland Flow Channel Flow Mannings Values (n) Overland Flow Overland Flow Shallow Conc. Flow Cottages at Carmel 7/18/2023 W22-0131 RME TPG Time of Concentration Calculations Prepared By: Checked By: Job No.: Date: Project: Shallow Conc Flow Travel Time: Channel Flow Travel Time: Short Grass 0.15 Grass 0.03 Dense Grass 0.24 Concrete 0.015 Shallow Conc Flow (Unpaved): Pavement 0.011 Rip-Rap 0.035 Shallow Conc Flow (Paved): 2 Yr, 24 Hr Rainfall= 2.66 Overland Flow Travel Time: Tc minimum= 5 Paved Gutter & Channel Flow Tc Basin Len S n T_t Len S n T_t Len S Pave/Un Vel T_t Len A Pw r S n Vel T_t (ft)%(min)(ft)%(min)(ft)%P or U (ft/s)(min)(ft)(sf)(ft)(ft)%(ft/s)(min)(min) Channel Flow Overland Flow Channel Flow Mannings Values (n) Overland Flow Overland Flow Shallow Conc. Flow Cottages at Carmel 7/18/2023 W22-0131 RME TPG Time of Concentration Calculations Prepared By: Checked By: Job No.: Date: Project: 631 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 632 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 633 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 634 35 2.00 0.24 7 0 95 1.30 U 1.84 1 0 7.6 635 40 3.00 0.24 6 0 95 1.00 U 1.61 1 0 7.4 636 40 3.00 0.24 6 0 0 1.00 P 2.03 0 0 6.4 637 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 638 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 639 36 2.00 0.24 7 0 53 1.10 U 1.69 1 0 7.4 640 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 641 22 1.00 0.24 6 0 0 1.00 P 2.03 0 0 6.2 642 0 1.00 0.24 0 0 0 0.00 U 0.00 0 0 5.0 EX 619 30 1.00 0.24 8 0 91 1.30 P 2.32 1 0 8.5 644 28 1.00 0.24 7 0 0 1.00 P 2.03 0 0 7.5 645 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 651 30 1.00 0.24 8 0 0 1.00 P 2.03 0 0 7.9 652 32 1.00 0.24 8 0 0 1.00 P 2.03 0 0 8.3 EX 640 43 1.00 0.24 11 0 0 1.00 P 2.03 0 0 10.5 EX 641 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 EX 642 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 EX 644 30 1.00 0.24 8 0 403 1.00 U 1.61 4 0 12.0 646 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 648 30 1.00 0.24 8 0 0 1.00 P 2.03 0 0 7.9 649 30 1.00 0.24 8 0 0 1.00 P 2.03 0 0 7.9 650 30 1.00 0.24 8 0 0 1.00 P 2.03 0 0 7.9 653 15 1.00 0.24 5 0 0 1.00 P 2.03 0 0 5.0 654 15 1.00 0.24 5 0 0 1.00 P 2.03 0 0 5.0 655 18 1.00 0.24 5 0 0 1.00 P 2.03 0 0 5.2 656 47 1.00 0.24 11 0 0 1.00 P 2.03 0 0 11.3 Shallow Conc Flow Travel Time: Channel Flow Travel Time: Short Grass 0.15 Grass 0.03 Dense Grass 0.24 Concrete 0.015 Shallow Conc Flow (Unpaved): Pavement 0.011 Rip-Rap 0.035 Shallow Conc Flow (Paved): 2 Yr, 24 Hr Rainfall= 2.66 Overland Flow Travel Time: Tc minimum= 5 Paved Gutter & Channel Flow Tc Basin Len S n T_t Len S n T_t Len S Pave/Un Vel T_t Len A Pw r S n Vel T_t (ft)%(min)(ft)%(min)(ft)%P or U (ft/s)(min)(ft)(sf)(ft)(ft)%(ft/s)(min)(min) Channel Flow Overland Flow Channel Flow Mannings Values (n) Overland Flow Overland Flow Shallow Conc. Flow Cottages at Carmel 7/18/2023 W22-0131 RME TPG Time of Concentration Calculations Prepared By: Checked By: Job No.: Date: Project: 657 54 1.00 0.24 13 0 0 1.00 P 2.03 0 0 12.6 658 36 1.00 0.24 9 0 0 1.00 P 2.03 0 0 9.1 EX 655 38 1.00 0.24 10 0 0 1.00 P 2.03 0 0 9.5 659 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 660 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 661 36 1.00 0.24 9 0 0 1.00 P 2.03 0 0 9.1 664 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 665 22 1.00 0.24 6 0 0 1.00 P 2.03 0 0 6.2 666 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 667 63 1.00 0.24 14 0 0 1.00 P 2.03 0 0 14.3 668 61 1.00 0.24 14 0 0 1.00 P 2.03 0 0 13.9 669 18 1.00 0.24 5 0 61 1.00 U 1.61 1 0 5.9 670 18 1.00 0.24 5 0 0 1.00 P 2.03 0 0 5.2 672 37 1.00 0.24 9 0 0 1.00 P 2.03 0 0 9.3 673 18 1.00 0.24 5 0 0 1.00 P 2.03 0 0 5.2 674 18 1.00 0.24 5 0 0 1.00 P 2.03 0 0 5.2 675 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 676 39 2.00 0.24 7 0 0 1.00 P 2.03 0 0 7.4 EX 672 23 1.00 0.24 6 0 0 1.00 P 2.03 0 0 6.4 EX 674 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 677 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 678 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 679 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 680 24 1.00 0.24 7 0 0 1.00 P 2.03 0 0 6.6 681 16 1.00 0.24 5 0 0 1.00 P 2.03 0 0 5.0 682 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 683 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 684 0 1.00 0.24 0 0 0 1.00 P 2.03 0 0 5.0 685 80 2.00 0.24 13 0 0 1.00 P 2.03 0 0 13.1 Shallow Conc Flow Travel Time: Channel Flow Travel Time: Short Grass 0.15 Grass 0.03 Dense Grass 0.24 Concrete 0.015 Shallow Conc Flow (Unpaved): Pavement 0.011 Rip-Rap 0.035 Shallow Conc Flow (Paved): 2 Yr, 24 Hr Rainfall= 2.66 Overland Flow Travel Time: Tc minimum= 5 Paved Gutter & Channel Flow Tc Basin Len S n T_t Len S n T_t Len S Pave/Un Vel T_t Len A Pw r S n Vel T_t (ft)%(min)(ft)%(min)(ft)%P or U (ft/s)(min)(ft)(sf)(ft)(ft)%(ft/s)(min)(min) Channel Flow Overland Flow Channel Flow Mannings Values (n) Overland Flow Overland Flow Shallow Conc. Flow Cottages at Carmel 7/18/2023 W22-0131 RME TPG Time of Concentration Calculations Prepared By: Checked By: Job No.: Date: Project: