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HomeMy WebLinkAboutMC DS Tract 7415 Hydrology Approved Study24-20001064 10/30/2024 24-20001064 10/30/2024 2 Table of Contents 1.0 PURPOSE...............................................................................................................3 2.0 GUIDELINES ..........................................................................................................3 3.0 DESIGN APPROACH.............................................................................................3 4.0 CONCLUSION AND RECOMMENDATIONS..........................................................4 Hydrology Calculations ........................................................................... back of report Inlet Sizing Calculations.......................................................................... back of report Basin Exhibit............................................................................ sleeve in back of report Drainage Exhibit ...................................................................... sleeve in back of report Reference............................................................................................... back of report 24-20001064 10/30/2024 3 1.0 PURPOSE The purpose for this drainage study is as follows: •To size sump in accordance with the City of Bakersfield requirements and guidelines. •To check curb capacities. 2.0 GUIDELINES The following design standards were used in the development of this study: 1. Initial times to concentration (roof to gutter) are 15 minutes for R-1 Development. 2. Approximately 100% of the site is Soil Group A – Kimberlina fine sandy loam, 0-2 percent slopes. The soil group was obtained from the US Department of Agriculture Soils Survey. A Soil Map is enclosed with this report. 3. The runoff coefficients used are: •0.15 - Park •0.69 - R-1, 3600-4000 SF (COMPOSITE) •0.85 - Pavement w/ Landscaping 3. Rainfall intensity curves used are those shown on Plate D-1 of the City of Bakersfield, Subdivision & Engineering Manual. 4. Sub-areas using multiple run-off coefficients are given a weighted average based on the area relative to each coefficient. 3.0 DESIGN APPROACH The contributing areas to the existing retention basin are zoned residential with arterial street (Allen Raod) therefore were modeled as such so that the improvements were accurate. The project area for the storm drain improvements are dictated by the flat terrain that is present. More specifically the improvements are designed to benefit all areas bounded to the north by South Pacific Railroad tracks, to the south by Tract 7408, to the east by vacant land and to the west by Allen Road that takes storm drain runoff into the Basin Drainage Area. Two catch basins (CB #1 & CB #2) will be located on Calle Airosa between the knuckles of Camino Vistosa and Camino Bendita will collect the discharge produced by Area A and Area B. Drainage Areas C and D will discharge into catch basins (CB #3 & CB #4) located north of the knuckle of Laguna Blanca Drive and Camino Bendita. CB #5 will collect the discharge produced by Area E on the knuckle of Laguna Blanca Drive and Camino Bendita. Drainage Areas F, G, & H will drain into catch basins (CB #6, CB #7, & CB #8) located on Camino Bendita at the T- intersection with Calle Torino. Drainage Areas I, J, and K (CB #9, CB #10, & CB #11) will discharge into catch basins located at the T-intersection of Camino Senda Verde and Camino Bendita. Based on the Addendum for the Tract 7408 Hydrology, existing Catch Basin #1, part of Tract 7408, collects runoff from a portion of Cantera Avenue and the park area (Drainage Area 1). Another portion of Tract 7408 included existing Drainage Area 2 includes a residential lots and a large portion of Allen Road which CB #2 will capture this surface discharge. The flows for the sizing of the pipes were estimated utilizing the City of Bakersfield Rational Method in accordance with the Subdivision Standards. Flows were computed for the 10-year event using the formula Q = CIA, where Q is the flow in cubic feet per second,C is the runoff coefficient,I is the intensity in inches per hour, and A is the catchment’s area in acres. Since the main purpose of this report is the storm drain system leading to the basin and the curb capacities were determined based the 5-year storm event. The coefficient values are provided for each area, and the calculations for the required and provided volumes are shown below and on the Basin Exhibit. 24-20001064 10/30/2024 4 Area Acres Coefficient C x A TRACT 7415 Park 3.18 0.15 0.48 R-1, 3600-4000 SF 31.27 0.69 21.57 TRACT 7415 Ʃ(CXA) =22.05 VOLUME REQUIRED (AF) =3.31 TRACT 7408 (per Approved Study) Park 2.98 0.15 0.44 R-1, 3600-4000 SF 35.30 0.69 24.36 Pavement with Landscaping 6.28 0.85 5.34 TRACT 7408 Ʃ(CXA) =30.14 ALL TRACTS Ʃ(CXA) =4.52 TOTAL (AC) 79.01 VOLUME REQUIRED (AF) =7.83 4.0 CONCLUSION AND RECOMMENDATIONS The main objectives of this study were to provide proper storm water runoff conveyance within the street R/W and an economical and reasonable design sizes for catch basins and other disposal inlets that meet the design standards set by the City of Bakersfield. T t.The overall watershed will maintain the same tributary area of 79.01 acres but will have slightly different distribution compared to the Approved Hydrology Study for Tract 7408 (See Reference). The area for the R-1 in Tract 7415 went from 33.35 acres to 31.27 acres since parts of the Tract would surface flow onto existing Tract 7408. Thus the acreage for this existing tract went up from 33.21 to 35.30 acres basin. The park value were also adjusted for Tract 7415 as well from 3.40 to 3.18 acres since grading allowed the runoff to flow southerly onto existing Tract 7408. The required basin volume was calculated using the City of Bakersfield sump volume equation (V=0.15 x Ʃ (CxA)). The required volume for will remain the same as calculated the Approved Hydrology Study for Tract 7408 (7.83 AF – Refer to Table above). The existing basin was designed with a 10.0-ft high design water surface with a capacity of 7.88 AF, as shown in the Approved Hydrology Study. The hydraulics routing and pipe sizing calculations for Tract 7415 will be submitted as part of a separate report with the submittal of the sewer & storm drain improvement plans. The overall watershed will maintain the same tributary area of 79.01 acres but will have slightly different distribution compared to the Approved Hydrology Study for Tract 7408 (See Reference). The area for the R-1 in Tract 7415 went from 33.35 acres to 31.27 acres since parts of the Tract would surface flow onto existing Tract 7408. Thus the acreage for this existing tract went up from 33.21 to 35.30 acres. The park value were also adjusted for Tract 7415 as well from 3.40 to 3.18 acres since grading allowed the runoff to flow southerly onto existing Tract 7408. The required basin volume was calculated using the City of Bakersfield sump volume equation (V=0.15 x Ʃ (CxA)). The required volume will remain the same as calculated the Approved Hydrology Study for Tract 7408 (7.83 AF – Refer to Table above). The existing basin was designed with a 10.0-ft high design water surface with a capacity of 7.88 AF, as shown in the Approved Hydrology Study. The hydraulics routing and pipe sizing calculations for Tract 7415 will be submitted as part of a separate report with the submittal of the sewer & storm drain improvement plans. 24-20001064 10/30/2024 SOIL MAP 24-20001064 10/30/2024 Hydrologic Soil Group—Kern County, California, Northwestern PartNatural ResourcesConservation ServiceWeb Soil SurveyNational Cooperative Soil Survey1/5/2024Page 1 of 4390884039089203909000390908039091603909240390876039088403908920390900039090803909160390924030475030483030491030499030507030515030523030531030539030547030475030483030491030499030507030515030523030531030539030547035°18'26''N119°8'51''W35°18'26''N119°8'22''W35°18'11''N119°8'51''W35°18'11''N119°8'22''WNMapprojection:WebMercatorCornercoordinates:WGS84Edgetics:UTMZone11NWGS840150300600900Feet050100200300MetersMapScale:1:3,430ifprintedonAlandscape(11"x8.5")sheet.SoilMapmaynotbevalidatthisscale.24-20001064 10/30/2024 MAP LEGENDMAP INFORMATIONArea of Interest (AOI)Area of Interest (AOI)SoilsSoil Rating PolygonsAA/DBB/DCC/DDNot rated or not availableSoil Rating LinesAA/DBB/DCC/DDNot rated or not availableSoil Rating PointsAA/DBB/DCC/DDNot rated or not availableWater FeaturesStreams and CanalsTransportationRailsInterstate HighwaysUS RoutesMajor RoadsLocal RoadsBackgroundAerial PhotographyThe soil surveys that comprise your AOI were mapped at1:24,000.Warning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Kern County, California, Northwestern PartSurvey Area Data: Version 16, Aug 31, 2023Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Mar 12, 2022—Mar22, 2022The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundimagery displayed on these maps. As a result, some minorshifting of map unit boundaries may be evident.Hydrologic Soil Group—Kern County, California, Northwestern PartNatural ResourcesConservation ServiceWeb Soil SurveyNational Cooperative Soil Survey1/5/2024Page 2 of 4 24-20001064 10/30/2024 Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 174 Kimberlina fine sandy loam, 0 to 2 percent slopes MLRA 17 A 41.2 100.0% Totals for Area of Interest 41.2 100.0% 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. Rating Options Aggregation Method:Dominant Condition Hydrologic Soil Group—Kern County, California, Northwestern Part Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/5/2024 Page 3 of 4 24-20001064 10/30/2024 Component Percent Cutoff: None Specified Tie-break Rule:Higher Hydrologic Soil Group—Kern County, California, Northwestern Part Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 1/5/2024 Page 4 of 4 24-20001064 10/30/2024 HYDROLOGY CALCULATIONS 24-20001064 10/30/2024 CITY OF BAKERSFIELD RATIONAL METHOD (In accordance with City of Bakersfield Standards) TABLE OF RUNOFF COEFFICIENTS R-1, 6000 SF 0.42 JOB TITLE:TRACT 7415 R-1, 6750 SF 0.4 DATE:Jun-24 R-1, 7500 SF 0.38 R-1, 10000 SF 0.34 Rational Values:R-1, 15000 SF 0.27 Event: 10 YEAR Values: 5,10, 50 COMPOSITE R-1, 3600-4000 SF 0.69 M.A.P. 6 in./yr. Values: 6, 10,15, 20, 25, 30 R-3, R-4, M-H 0.8 Commercial 0.9 Curve Values Parks 0.15 a: 2.38 I=a+bTc (Tc<20min.)Grasslands, Type A Soil 0.15 b: -0.058 Grasslands, Type B Soil 0.25 P60: 0.550 I=K1*(6.02*Tc)^(0.17*LN(p60/K1) Grasslands, Type C Soil 0.35 K1: 40.00 (Tc>=20min.)Grasslands, Type D Soil 0.45 Pavement with Landscaping 0.85 Backyards 0.05 Lawn-landscape 2% slope 0.10 0.17 Lawn-landscape 2-7% slope 0.15 0.22 Lawn-landscape 7% slope 0.20 0.35 SUBAREA C I A rslt Tc L dH Sg Q Street V Trial Tc Roof to Tm D Curb NAME Runoff Intensity Total Time Length Elev. Gutter Flow Type Vel. MIN. Gutter Travel Pipe Cap Coef. IN/HR Area Conc. Feet Diff.Slope CFS FPS Time Time Dia. In AC. MIN. Feet Ft/Ft MIN. MIN. In. AREA A 0.69 1.35 2.20 17.71 279.5 0.73 0.26% 2.05 60 1.72 17.71 15 2.71 0 4.1 AREA B 0.69 1.10 6.15 23.11 1000.0 2.93 0.29% 4.65 60 2.055 23.11 15 8.11 0 5.0 AREA C 0.69 1.08 4.57 23.52 935.1 2.32 0.25% 3.41 60 1.829 23.52 15 8.52 0 4.6 AREA D 0.69 1.21 3.57 20.16 556.1 1.39 0.25% 2.98 60 1.794 20.16 15 5.16 0 4.5 AREA E 0.69 1.50 1.301 15.12 18.5 0.2 1.08% 1.35.60 2.477 15.12 15 0.12 . AREA F 0.69 1.15 3.79 21.75 793.4 2.36 0.30% 3.00 60 1.959 21.75 15 6.75 0 4.4 AREA G 0.15 1.38 1.95 17.14 259.3 2.08 0.80% 0.40 60 2.018 17.14 15 2.14 0 2.0 AREA H 0.69 1.15 3.64 21.72 787.4 2.36 0.30% 2.88 60 1.953 21.72 15 6.72 0 4.4 AREA I 0.69 1.12 3.75 22.40 794.0 1.87 0.24%2.90 60 1.788 22.40 15 7.40 0 4.4 AREA J 0.69 1.20 2.30 20.52 625.0 1.98 0.32% 1.90 60 1.887 20.52 15 5.52 0 4.0 AREA K 0.15 1.38 1.22 17.19 259.4 2.08 0.80% 0.25 60 1.97 17.19 15 2.19 0 1.6 AREA 1 0.15 1.80 0.83 10.00 97 1.26 0.01 0.22 60 1.97 10 0 0.82 0 1.4 AREA 2 0.78 1.40 4.05 16.85 400 3.60 0.01 4.40 60 3.611 16.85 15 1.85 0 4.5 Tc CALCULATIONS TRACT 7415 REVISED TRACT 7408 Hydrology_10_yr - REV.xls McIntosh Associates 10800 Stockdale Hwy., Suite 103 Bakersfield, CA 93311 10 yr Calc 0 2.88 24-20001064 10/30/2024 INLET & PIPE SIZING CALCULATIONSINLETPE SIZING CALCULATIONSINLET 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area A: CB-1> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.025 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 2.05 Highlighted Q Total (cfs) = 2.05 Q Capt (cfs) = 2.05 Q Bypass (cfs) = -0- Depth at Inlet (in) = 6.40 Efficiency (%) = 100 Gutter Spread (ft) = 10.002 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area B: CB-2> Curb Inlet Location = Sag Curb Length (ft) = 6.25 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.035 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 4.65 Highlighted Q Total (cfs) = 4.65 Q Capt (cfs) = 4.65 Q Bypass (cfs) = -0- Depth at Inlet (in) = 7.33 Efficiency (%) = 100 Gutter Spread (ft) = 9.94 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area C: CB-3> Curb Inlet Location = Sag Curb Length (ft) = 5.00 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.031 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 3.41 Highlighted Q Total (cfs) = 3.41 Q Capt (cfs) = 3.41 Q Bypass (cfs) = -0- Depth at Inlet (in) = 6.96 Efficiency (%) = 100 Gutter Spread (ft) = 9.99 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area D: CB-4> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.033 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 2.98 Highlighted Q Total (cfs) = 2.98 Q Capt (cfs) = 2.98 Q Bypass (cfs) = -0- Depth at Inlet (in) = 7.06 Efficiency (%) = 100 Gutter Spread (ft) = 9.74 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Monday, Jun 17 2024 Drainage Area E: CB-5> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.020 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 1.35 Highlighted Q Total (cfs) = 1.35 Q Capt (cfs) = 1.35 Q Bypass (cfs) = -0- Depth at Inlet (in) = 5.79 Efficiency (%) = 100 Gutter Spread (ft) = 9.48 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area F: CB-6> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.033 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 3.00 Highlighted Q Total (cfs) = 3.00 Q Capt (cfs) = 3.00 Q Bypass (cfs) = -0- Depth at Inlet (in) = 7.08 Efficiency (%) = 100 Gutter Spread (ft) = 9.79 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area G: CB-7> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.020 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 0.40 Highlighted Q Total (cfs) = 0.40 Q Capt (cfs) = 0.40 Q Bypass (cfs) = -0- Depth at Inlet (in) = 4.52 Efficiency (%) = 100 Gutter Spread (ft) = 4.21 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area H: CB-8> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.032 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 2.88 Highlighted Q Total (cfs) = 2.88 Q Capt (cfs) = 2.88 Q Bypass (cfs) = -0- Depth at Inlet (in) = 7.00 Efficiency (%) = 100 Gutter Spread (ft) = 9.82 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area I: CB-9> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.032 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 2.90 Highlighted Q Total (cfs) = 2.90 Q Capt (cfs) = 2.90 Q Bypass (cfs) = -0- Depth at Inlet (in) = 7.01 Efficiency (%) = 100 Gutter Spread (ft) = 9.87 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area J: CB-10> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.024 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 1.90 Highlighted Q Total (cfs) = 1.90 Q Capt (cfs) = 1.90 Q Bypass (cfs) = -0- Depth at Inlet (in) = 6.27 Efficiency (%) = 100 Gutter Spread (ft) = 9.92 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 Inlet Report Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.Wednesday, Jun 12 2024 Drainage Area K: CB-11> Curb Inlet Location = Sag Curb Length (ft) = 3.50 Throat Height (in) = 4.00 Grate Area (sqft) = -0- Grate Width (ft) = -0- Grate Length (ft) = -0- Gutter Slope, Sw (ft/ft) = 0.083 Slope, Sx (ft/ft) = 0.020 Local Depr (in) = 2.00 Gutter Width (ft) = 2.00 Gutter Slope (%) = -0- Gutter n-value = -0- Calculations Compute by: Known Q Q (cfs) = 0.25 Highlighted Q Total (cfs) = 0.25 Q Capt (cfs) = 0.25 Q Bypass (cfs) = -0- Depth at Inlet (in) = 4.25 Efficiency (%) = 100 Gutter Spread (ft) = 3.08 Gutter Vel (ft/s) = -0- Bypass Spread (ft) = -0- Bypass Depth (in) = -0- 24-20001064 10/30/2024 DBASIN EXHIBIT 24-20001064 10/30/2024 DRAINAGE EXHIBIT 24-20001064 10/30/2024 24-2000106410/30/2024 DREFERENCET 24-20001064 10/30/2024 Know what'sRREFERENCE ONLY24-2000106410/30/2024 TRACT 7408 and FUTURE TRACT 7415 BASIN SIZING CALCULATIONS 1 341.5 340.5 330.5 10 feet Abtm =26,566 sq ft =0.61 acres Amid =34,266 sq ft =0.79 acres Atop =42,636 sq ft =0.98 acres Provided Sump Capacity =343,778 Cu. FT 7.89 AC-FT TABLE OF RUNOFF COEFFICIENTS C x A = FUTURE TR 7408 TR 7415 R-1, 6000 SF 0.42 R-1, 6750 SF 0.4 R-1, 7500 SF 0.38 R-1, 10000 SF 0.34 R-1, 15000 SF 0.27 R-2 0.55 COMPOSITE R-1, 3600-4000 SF 0.69 33.35 33.21 45.93 R-3, R-4, M-H 0.8 Commercial 0.9 Industrial 0.8 Parks 0.15 3.40 2.77 0.93 Grasslands, Type A Soil 0.15 Grasslands, Type B Soil 0.25 Grasslands, Type C Soil 0.35 Grasslands, Type D Soil 0.45 Pavement with Landscaping 0.85 6.28 5.34 Backyards 0.05 Lawn-landscape 2% slope 0.17 Lawn-landscape 2-7% slope 0.22 Lawn-landscape 7% slope 0.35 n C x A =52.19 TR 7415 TR 7408 Total 36.75 42.26 =Acres 79.01 Required Sump Capacity = 0.15 x C x A = 0.15 X n C x A =7.83 AC-FT 0.06 AC-FT FUTURE Total Difference of Bottom Area of Sump Half Depth Area of Sump Area of Design Water Level Prismoidal Formula: Volume = 1/6 x(Abtm+4Amid+Atop) x D Required Sump Capacity Depth from Design Water Surface = Provided Sump Capacity Freeboard (ft)=Lowest Inlet Elev = Water Surface Elev =Bottom Basin Elev = 8 24-20001064 10/30/2024