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Home My WebLink AboutGrading Plans - 11/06/2024TX TXINV-01INV-02INV-03INV-04INV-05 INV-06INV-07INV-08INV-09 CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB CB U.S. H W Y . 1 8 3 CALLED 199.93 ACRES DOC. NO. 201800093 O.P.R.B.C. CALLED 102.07 ACRES DOC. NO. 201702618 O.P.R.B.C. CALLED 147.709 ACRES VOL. 1480 PG. 291 P.R.B.C. CALLED 2771.474 ACRES DOC. NO. 202114141 O.P.R.B.C. PROPOSED SITE IMPROVEMENTS PROJECT SITE L: \ P r o j e c t s \ 2 4 0 0 1 c - 1 8 3 S o l a r L a m p a s a s \ D r a w i n g s \ 2 4 0 0 1 c - 0 0 - C V R - 0 0 . d w g DE S C R I P T I O N DW N DA T E NO . 18 3 S O L A R - P H A S E 1 15 5 0 0 S O U T H H I G H W A Y 1 8 3 LA M P A S A S , B U R N E T C O U N T Y , T E X A S CH K www.conterraeng.com 242 Linden Street #5943 Fort Collins, CO 80524 720-689-5806 DESIGNER: APPROVER: JOB #: DATE: 05/16/24JJC ETN24001 NOT F O R CON S T R U C T I O N ET N 5/ 1 6 / 2 4 A JJ C 60 % S U B M I T T A L C0.0 CO V E R S H E E T 183 SOLAR - PHASE 1 15500 SOUTH HIGHWAY 183 LAMPASAS, BURNET COUNTY, TEXAS 60% CIVIL SUBMITTAL 242 Linden Street #5943 Fort Collins, CO 80524 720-689-5806 www.conterraeng.com SHEET INDEX SHEET #SHEET TITLE C0.0 COVER SHEET C0.1 GENERAL NOTES C1.0 EX. CONDITIONS & DEMOLITION PLAN C2.0 OVERALL SITE PLAN C2.1 DETAILED SITE & EROSION CONTROL PLAN CD2.1 SITE DETAILS CD2.2 SITE DETAILS CD2.3 SITE DETAILS CD2.4 SITE DETAILS PROJECT CONTACTS OWNER:183 SOLAR PRASHANT GABANI PRASHANT@183SOLAR.COM CIVIL ENGINEER:CONTERRA ENGINEERING 242 LINDEN STREET #5943 FORT COLLINS, CO 80524 (720)689-5806 JJ CUTLER, P.E. JCUTLER@CONTERRAENG.COM ELECTRICAL ENGINEER:ILLUMINE-i 1320 ARROW POINT DR, SUITE 501 (510) 989-4799 VIJAY S. VIJAYARAGHAVAN.S@INLLUMINEI.COM REFERENCES REFERENCE AUTHOR/CREATOR DATE SOURCE TITLE OR FILE NAME TOPOGRAPHIC SURVEY SURVEY WORKS 3/12/2024 OWNER Topo DWG File.dwg ALTA SURVEY MAPLE & ASSOCIATES -OWNER "Survey 15500.pdf" (Ground survey completed 01/30/22) GEOTECHNICAL REPORT MLA GEOTECHNIAL APRIL 2024 OWNER Geotechnical Feasibility Evaluation - Highway 183 Solar PERMITTING REPORT ESE PARTNERS 3/11/2024 OWNER Environmental Permit Matrix CIA REPORT ESE PARTNERS 3/11/2024 OWNER Critical Issues Analysis - 15500 South Highway 183 VICINITY MAP SCALE: 1" = 15,000 SITE MAP SCALE: 1" = 1,000 U.S. H W Y . 1 8 3 LAMPASAS KEMPNER BRIGGS 183 281 190 49 3 6 49 3 0 49 3 2 49 2 8 SCALE IN FEET 50 50 1000 EXISTING ONE STORY HOUSE 3,300 SF FFE=4928.30 GARAGE ADDITION FFE=4926.30 HOUSE ADDITION FFE=4928.30 10 4925.66 FG 4925.00 FG MATCH EXISTING FG MATCH EXISTING 4925.56 EOP 4925.46 EOP INSTALL SWALE BETWEEN NEW GARAGE AND EXISTING SHED. AIMED AT SAND PLAY AREA. EXISTING SAND PLAY AREA. THIS SAND AREA WILL ACT AS DETENTION AND WATER QUALITY CAPTURING, TREATING AND DISCHARGING THE 100-YR STORM EVENT EXISTING CAPACITY = 360 CUBIC FEET REQUIRED CAPACITY=261 CUBIC FEET GENERAL NOTES: THE INFORMATION PROVIDED HEREIN IS GATHERED FROM EXISTING DONDITION ASSESSMENT AND INFORMATION AVAILABLE AT THE TIME OF DESIGN. CONTRACTOR TO CONFIRM ALL EXISTING CONDITIONS AND NOTIFY ENGINEER OF ANY DISCREPANCIES PRIOR TO START OF CONSTRUCTION. THE TOPOGRAPHIC INFORMATION SHOWN ON THIS PLAN HAS BEEN GATHERED FROM THE CITY OF FORT COLLINS GEOGRAPHIC INFORMATION SYSTEMS WEBSITE. PRIOR TO CONSTRUCTION, ALL GRADES AND ELEVATIONS SHOULD BE CONFIRMED. NOTIFY ENGINEER OF ANY DISCREPANCIES ASBUILT CONDITIONS WILL NEED TO BE SURVEYED AND PROVIDED TO ENGINEER FOR THE LOT GRADING CERTIFICATION. GRADING NOTES: THIS SITE IS NOT LOCATED IN A DESIGNATED BASIN WITHIN THE CITY OF FORT COLLINS. THE TOP OF FOUNDATION IS TO BE AT LEAST 6" ABOVE THE HIGHEST GRADE SURROUNDING THE STRUCTURE. THERE IS TO BE A MINIMUM GRADE OF 5% AWAY FROM THE STRUCTURE WITHIN THE FIRST 10'. ALL SLOPES TO BE A MINIMUM OF 2% IN LANDSCAPE AREAS. CONTRACTOR TO LOCATE AND VERIFIY LOCATION OF ALL EXISTING UTILITIES PRIOR TO CONSTRUCTION. PROVIDE POSITIVE DRAINAGE AWAY FROM ALL NEW AND EXISTING BUILDINGS. ARCHITECTURAL 100=4928.30 THE ELEVATIONS SHOWN ON THIS PLAN ARE FOR REFERENCE ONLY, AND HAVE NOT BEEN TOPOGRAPHICALLY SURVEYED. ALL DOWNSPOUTS TO BE DIRECTED AWAY FROM BUILDING AND TOWARDS SAND PLAY AREA. STORMWATER NOTES: EXISTING IMPERVIOUSNESS: ROOFTOP (HOUSE & SHED): 4,900FT2 AT 90% DRIVEWAY & PATIO: 19,600FT2 AT 90% GRAVEL: 1,600FT2 AT 40% LANDSCAPE (C/D SOILS): 409,761FT2 AT 2% TOTAL AREA: 435,861FT2 WEIGHTED IMPERVIOUSNESS: 7.1% PROPOSED IMPERVIOUSNESS: ROOFTOP (HOUSE & SHED): 7,100FT2 AT 90% DRIVEWAY & PATIO: 19,600FT2 AT 90% GRAVEL: 1,600FT2 AT 40% LANDSCAPE (C/D SOILS): 407,561FT2 AT 2% TOTAL AREA: 435,861FT2 WEIGHTED IMPERVIOUSNESS: 7.5% 4927.80 4927.80 4927.80 49 2 2 49 2 4 49 2 0 49 1 8 49 3 0 49 2 8 49 2 6 4934 4932 4936 4938 4934 49 3 8 49 3 4 49 3 6 49 3 4 49 3 2 49 3 2 49 3 4 4936 Historic Basin Design Data I (%) = 100% 90% 90% 40% 2% 2%I (%) Basin Name Design Point Apaved streets (sf) Adrives/conc (sf)Aroof (sf)Agravel (sf) Alscape (B soil) (sf) Alscape (sf) ATotal (sf)ATotal (ac)Effective Imp Area (sf)Imp (%) H1 1 19,600 4,900 1,600 409,761 435,861 10.01 30885.22 7.1% Proposed Basin Design Data I (%) = 100% 90% 90% 40% 2% 2%I (%) Basin Name Design Point Apaved streets (sf) Adrives/conc (sf)Aroof (sf)Agravel (sf) Alscape (B soil) (sf) A (C/D soil) (sf) ATotal (sf)ATotal (ac)Effective Imp Area (sf)Imp (%) P1 1 19,600 7,100 1,600 407,561 435,861 10.01 32821.22 7.5% Difference:1936.00 0.44% 2021/06/302021/07/23Nov 18, 2021Nov 1, 2024 Grading/Stormwater Plan Accepted (Building Permit Released) Accepted by: Date: Derek Lutz 11/06/2024 November 1, 2024 Derek Lutz, P.E. Fort Collins Water Utilities 700 Wood Street Fort Collins, CO 80521 RE: 2522 Kechter Road Residential Home Addition Drainage Memo Residential Permit Number B2407536 Dear Derek: This letter has been prepared to summarize the drainage impacts associated with the proposed construction of an addition to an existing home located at 2522 Kechter Road. The existing single-family detached residence will remain in place, and a proposed addition totaling approximately 2,200 square feet will be added. Existing Conditions The existing single-family detached residence at 2522 Kechter Road sits on a 10.006-acre lot, is bound to the north by Stetson Creek HOA open space, to the west by a residential property at 2500 Kechter Road, to the south by Kechter Road, and to the east by a single-family residence at 2524 Kechter Road and the residential development of Sage Creek. Muskrat Ditch crosses the from east to west along the north edge of the property which is encompassed by a Storm & Drainage Easement dedicated to the City of Fort Collins. The existing site consists of an approximately 3,300 square foot single story residence, grasses, trees and an asphalt paved driveway. The site is relatively flat and drains from south to north into Muskrat Ditch. Kechter Road sheet flows into a roadside ditch and does not drain onto the property. It appears the south property line is the top of a berm which prevents any stormwater from the right-of-way entering the project site. According to the NRCS Web Soil Survey, this site has hydrologic soil group C. The existing weighted imperviousness is 7.1%, see impervious calculation spreadsheet attached herein. The site is located in FEMA Flood Zone X, area of minimal hazard, per FEMA Flood Insurance Rate Map number 08069C0994F, effective date 12/19/2006. Proposed Conditions The site topography itself is to remain as it currently is. Grading around the additions will be minimal and intended to provide positive drainage away from the foundation and rest of the home. Downspouts will be added at the additions, and/or tied into the existing downspouts. These downspouts will drain out into the grassed area around the house. According to the Drainage Information Required for Residential Permit Applications, this is a “large project”. That is, this project proposes to add more than 1,000 square feet of impervious area. Although it is not the intention of the code to add water quality and detention ponds to individual residential sites, it is imperative that the additional runoff due to the added imperviousness is collected, treated and discharged in a manner to not cause negative impacts downstream. This site is not a typical residential site in the city limits in that this house sits on 10 acres surrounded by grasses and trees. Therefore, the additions, even though large for a residential property, are relatively Grading/Stormwater Plan Accepted (Building Permit Released) Accepted by: Date : Derek Lutz 11/06/2024 2522 Kechter Road November 1, 2024 2 of 2 small compared to the size of the lot. The existing weighted imperviousness is 7.1%, and the final proposed imperviousness is 7.5%, see attached impervious calculation spreadsheet attached herein. The typical allowable imperviousness in the Old Town or Spring Creek drainage basins are between 30% and 40%. Even though this property is well below typical residential development impervious values, water quality and detention will be addressed as follows: The water quality will be addressed by implementing Mile High Flood Districts (MHFD) Minimizing Directly Connected Impervious Area (MDCIA). This will be achieved by routing all downspouts from the house directly into a vegetated landscape buffer. There is approximately 155’ between the house and the easement encompassing Muskrat Ditch, which this property drains to. The large landscape buffer will allow minor storm events to spread out, slow down, and infiltrate into the soils while filtering out sediments and pollutants from the roofs and driveway prior to entering the Ditch. In addition to implementing the MDCIA and vegetated landscape buffer, a large portion of the site drains towards a sand play area. This sand will also help to capture and filter runoff from larger storm events. The detention to attenuate peak flows from the proposed additions can also be handled with the sand play area. The sand is approximately 1,800 square feet in area with an average depth of 6”. Utilizing a conservative estimate for voids of 0.40 in play sand, this gives the sand area potential detention capacity of 360 cubic feet. According to MHFD’s Detention Design spreadsheet attached herein, the detention volume required for the 100-year storm is 0.006acre-feet, or 261 cubic feet. Therefore, the sand play area has 138% of the capacity required. The largest portion of the house addition is located just up hill from the sand area, therefore, the downspouts can be situated such that they cross the vegetated landscape buffer prior to entering the sand area for detention and infiltration. The outlet of the sand area will be a natural grass edge that will act as a level spreader preventing erosion and slowing the discharge. Infiltration of the stormwater will prevent any ponding concerns in the lower levels of the sand area. Erosion and Sediment Control During construction, temporary erosion and sediment control practices will be used to limit soil erosion and sediment discharge off the site. In our professional opinion, the development of this project will have no adverse impacts on the surrounding developments. Please feel free to contact me to discuss any questions you may have. Sincerely, By: ________________________________ Erik T. Nakos, P.E. Managing Partner Attachments: Impervious Calculations Spreadsheet, MHFD – Detention Design Spreadsheet 2021/06/302021/07/23Nov 18, 2021Nov 1, 2024 Historic Basin Design Data I (%) = 100% 90% 90% 40% 2% 2%I (%) Basin Name Design Point Apaved streets (sf) Adrives/conc (sf)Aroof (sf)Agravel (sf) Alscape (B soil) (sf) Alscape (sf) ATotal (sf)ATotal (ac)Effective Imp Area (sf)Imp (%) H1 1 19,600 4,900 1,600 409,761 435,861 10.01 30885.22 7.1% Proposed Basin Design Data I (%) = 100% 90% 90% 40% 2% 2%I (%) Basin Name Design Point Apaved streets (sf) Adrives/conc (sf)Aroof (sf)Agravel (sf) Alscape (B soil) (sf) A (C/D soil) (sf) ATotal (sf)ATotal (ac)Effective Imp Area (sf)Imp (%) P1 1 19,600 7,100 1,600 407,561 435,861 10.01 32821.22 7.5% Difference:1936.00 0.44% Project: Basin ID: Depth Increment = 0.10 ft Watershed Information Flood Control Only Media Surface -- 0.00 -- -- -- 0 0.000 Selected BMP Type =No BMP -- 1.00 -- -- -- 3,387 0.078 1,693 0.039 Watershed Area = 10.01 acres -- 2.00 -- -- -- 6,161 0.141 6,467 0.148 Watershed Length = 1,300 ft -- 3.00 -- -- -- 7,802 0.179 13,449 0.309 Watershed Length to Centroid = 650 ft -- 4.00 -- -- -- 9,556 0.219 22,128 0.508 Watershed Slope = 0.020 ft/ft -- 5.00 -- -- -- 11,432 0.262 32,622 0.749 Watershed Imperviousness = 7.10% percent -- 6.00 -- -- -- 13,448 0.309 45,062 1.034 Percentage Hydrologic Soil Group A = 0.0% percent -- 7.00 -- -- -- 15,642 0.359 59,607 1.368 Percentage Hydrologic Soil Group B = 0.0% percent -- 7.80 -- -- -- 18,698 0.429 73,343 1.684 Percentage Hydrologic Soil Groups C/D = 100.0% percent -- -- -- -- Target WQCV Drain Time = N/A hours -- -- -- -- Location for 1-hr Rainfall Depths = User Input -- -- -- -- -- -- -- -- -- -- -- -- Optional User Overrides -- -- -- -- Water Quality Capture Volume (WQCV) = 0.041 acre-feet acre-feet -- -- -- -- Excess Urban Runoff Volume (EURV) = 0.057 acre-feet acre-feet -- -- -- -- 2-yr Runoff Volume (P1 = 0.71 in.) = 0.020 acre-feet 0.71 inches -- -- -- -- 5-yr Runoff Volume (P1 = 0.92 in.) = 0.039 acre-feet 0.92 inches -- -- -- -- 10-yr Runoff Volume (P1 = 1.12 in.) = 0.104 acre-feet 1.12 inches -- -- -- -- 25-yr Runoff Volume (P1 = 1.41 in.) = 0.377 acre-feet 1.41 inches -- -- -- -- 50-yr Runoff Volume (P1 = 1.66 in.) = 0.564 acre-feet 1.66 inches -- -- -- -- 100-yr Runoff Volume (P1 = 1.92 in.) = 0.824 acre-feet 1.92 inches -- -- -- -- 500-yr Runoff Volume (P1 = 3.14 in.) = 1.848 acre-feet inches -- -- -- -- Approximate 2-yr Detention Volume = 0.027 acre-feet -- -- -- -- Approximate 5-yr Detention Volume = 0.078 acre-feet -- -- -- -- Approximate 10-yr Detention Volume = 0.115 acre-feet -- -- -- -- Approximate 25-yr Detention Volume = 0.151 acre-feet -- -- -- -- Approximate 50-yr Detention Volume = 0.162 acre-feet -- -- -- -- Approximate 100-yr Detention Volume = 0.240 acre-feet -- -- -- -- -- -- -- -- Define Zones and Basin Geometry -- -- -- -- Select Zone 1 Storage Volume (Required) = acre-feet -- -- -- -- Select Zone 2 Storage Volume (Optional) = acre-feet -- -- -- -- Select Zone 3 Storage Volume (Optional) = acre-feet -- -- -- -- Total Detention Basin Volume = acre-feet -- -- -- -- Initial Surcharge Volume (ISV) = N/A ft 3 -- -- -- -- Initial Surcharge Depth (ISD) = N/A ft -- -- -- -- Total Available Detention Depth (Htotal) =user ft -- -- -- -- Depth of Trickle Channel (HTC) =user ft -- -- -- -- Slope of Trickle Channel (STC) =user ft/ft -- -- -- -- Slopes of Main Basin Sides (Smain) =user H:V -- -- -- -- Basin Length-to-Width Ratio (RL/W) =user -- -- -- -- -- -- -- -- Initial Surcharge Area (AISV) =user ft 2 -- -- -- -- Surcharge Volume Length (LISV) =user ft -- -- -- -- Surcharge Volume Width (WISV) =user ft -- -- -- -- Depth of Basin Floor (HFLOOR) =user ft -- -- -- -- Length of Basin Floor (LFLOOR) =user ft -- -- -- -- Width of Basin Floor (WFLOOR) =user ft -- -- -- -- Area of Basin Floor (AFLOOR) =user ft 2 -- -- -- -- Volume of Basin Floor (VFLOOR) =user ft 3 -- -- -- -- Depth of Main Basin (HMAIN) =user ft -- -- -- -- Length of Main Basin (LMAIN) =user ft -- -- -- -- Width of Main Basin (WMAIN) =user ft -- -- -- -- Area of Main Basin (AMAIN) =user ft 2 -- -- -- -- Volume of Main Basin (VMAIN) =user ft 3 -- -- -- -- Calculated Total Basin Volume (Vtotal) =user acre-feet -- -- -- -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- After providing required inputs above including 1-hour rainfall depths, click 'Run CUHP' to generate runoff hydrographs using the embedded Colorado Urban Hydrograph Procedure. Volume (ft 3) Volume (ac-ft) Area (acre) DETENTION BASIN STAGE-STORAGE TABLE BUILDER Optional Override Area (ft 2) Length (ft) Optional Override Stage (ft) Stage (ft) Stage - Storage Description Area (ft 2) Width (ft) 2522 Kechter Road Pre Development Detention Volume MHFD-Detention, Version 4.05 (January 2022) Example Zone Configuration (Retention Pond) MHFD-Detention_v4-05, Basin 11/1/2024, 10:23 AM Project: Basin ID: Depth Increment = 0.10 ft Watershed Information Flood Control Only Media Surface -- 0.00 -- -- -- 0 0.000 Selected BMP Type =No BMP -- 1.00 -- -- -- 3,387 0.078 1,693 0.039 Watershed Area = 10.01 acres -- 2.00 -- -- -- 6,161 0.141 6,467 0.148 Watershed Length = 1,300 ft -- 3.00 -- -- -- 7,802 0.179 13,449 0.309 Watershed Length to Centroid = 650 ft -- 4.00 -- -- -- 9,556 0.219 22,128 0.508 Watershed Slope = 0.020 ft/ft -- 5.00 -- -- -- 11,432 0.262 32,622 0.749 Watershed Imperviousness = 7.50% percent -- 6.00 -- -- -- 13,448 0.309 45,062 1.034 Percentage Hydrologic Soil Group A = 0.0% percent -- 7.00 -- -- -- 15,642 0.359 59,607 1.368 Percentage Hydrologic Soil Group B = 0.0% percent -- 7.80 -- -- -- 18,698 0.429 73,343 1.684 Percentage Hydrologic Soil Groups C/D = 100.0% percent -- -- -- -- Target WQCV Drain Time = N/A hours -- -- -- -- Location for 1-hr Rainfall Depths = User Input -- -- -- -- -- -- -- -- -- -- -- -- Optional User Overrides -- -- -- -- Water Quality Capture Volume (WQCV) = 0.044 acre-feet acre-feet -- -- -- -- Excess Urban Runoff Volume (EURV) = 0.061 acre-feet acre-feet -- -- -- -- 2-yr Runoff Volume (P1 = 0.71 in.) = 0.021 acre-feet 0.71 inches -- -- -- -- 5-yr Runoff Volume (P1 = 0.92 in.) = 0.041 acre-feet 0.92 inches -- -- -- -- 10-yr Runoff Volume (P1 = 1.12 in.) = 0.107 acre-feet 1.12 inches -- -- -- -- 25-yr Runoff Volume (P1 = 1.41 in.) = 0.380 acre-feet 1.41 inches -- -- -- -- 50-yr Runoff Volume (P1 = 1.66 in.) = 0.567 acre-feet 1.66 inches -- -- -- -- 100-yr Runoff Volume (P1 = 1.92 in.) = 0.827 acre-feet 1.92 inches -- -- -- -- 500-yr Runoff Volume (P1 = 3.14 in.) = 1.852 acre-feet inches -- -- -- -- Approximate 2-yr Detention Volume = 0.029 acre-feet -- -- -- -- Approximate 5-yr Detention Volume = 0.081 acre-feet -- -- -- -- Approximate 10-yr Detention Volume = 0.118 acre-feet -- -- -- -- Approximate 25-yr Detention Volume = 0.155 acre-feet -- -- -- -- Approximate 50-yr Detention Volume = 0.167 acre-feet -- -- -- -- Approximate 100-yr Detention Volume = 0.246 acre-feet -- -- -- -- -- -- -- -- Define Zones and Basin Geometry -- -- -- -- Select Zone 1 Storage Volume (Required) = acre-feet -- -- -- -- Select Zone 2 Storage Volume (Optional) = acre-feet -- -- -- -- Select Zone 3 Storage Volume (Optional) = acre-feet -- -- -- -- Total Detention Basin Volume = acre-feet -- -- -- -- Initial Surcharge Volume (ISV) = N/A ft 3 -- -- -- -- Initial Surcharge Depth (ISD) = N/A ft -- -- -- -- Total Available Detention Depth (Htotal) =user ft -- -- -- -- Depth of Trickle Channel (HTC) =user ft -- -- -- -- Slope of Trickle Channel (STC) =user ft/ft -- -- -- -- Slopes of Main Basin Sides (Smain) =user H:V -- -- -- -- Basin Length-to-Width Ratio (RL/W) =user -- -- -- -- -- -- -- -- Initial Surcharge Area (AISV) =user ft 2 -- -- -- -- Surcharge Volume Length (LISV) =user ft -- -- -- -- Surcharge Volume Width (WISV) =user ft -- -- -- -- Depth of Basin Floor (HFLOOR) =user ft -- -- -- -- Length of Basin Floor (LFLOOR) =user ft -- -- -- -- Width of Basin Floor (WFLOOR) =user ft -- -- -- -- Area of Basin Floor (AFLOOR) =user ft 2 -- -- -- -- Volume of Basin Floor (VFLOOR) =user ft 3 -- -- -- -- Depth of Main Basin (HMAIN) =user ft -- -- -- -- Length of Main Basin (LMAIN) =user ft -- -- -- -- Width of Main Basin (WMAIN) =user ft -- -- -- -- Area of Main Basin (AMAIN) =user ft 2 -- -- -- -- Volume of Main Basin (VMAIN) =user ft 3 -- -- -- -- Calculated Total Basin Volume (Vtotal) =user acre-feet -- -- -- -- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- After providing required inputs above including 1-hour rainfall depths, click 'Run CUHP' to generate runoff hydrographs using the embedded Colorado Urban Hydrograph Procedure. Volume (ft 3) Volume (ac-ft) Area (acre) DETENTION BASIN STAGE-STORAGE TABLE BUILDER Optional Override Area (ft 2) Length (ft) Optional Override Stage (ft) Stage (ft) Stage - Storage Description Area (ft 2) Width (ft) 2522 Kechter Road Post Development Detention Volume MHFD-Detention, Version 4.05 (January 2022) Example Zone Configuration (Retention Pond) MHFD-Detention_v4-05, Basin 11/1/2024, 10:22 AM