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Home My WebLink AboutStormwater Report Designing The Future Preliminary Stormwater Narrative College Park Church Outdoor Venue 2606 W. 96th Street Carmel, Indiana MERITCORP PROJECT NUMBER: M20027 DATE: June 14, 2022 Owner/Developer: College Park Church 2606 W. 96th Street Carmel, Indiana Prepared for: Aspen Group 9645 Lincoln Way Lane, Suite 201 Frankfort, Illinois 60423 Prepared by: MeritCorp Group, LLC 4222 Meridian Parkway, Suite 112 Aurora, Illinois 60504 www.meritcorp.com MeritCorp Group, LLC College Park Church Outdoor Venue Carmel, Indiana Preliminary Stormwater Narrative Additional Office Location: 4222 Meridian Parkway, Suite 112 Gurnee, IL Aurora, IL 60504 Integrity.Precision.Quality.Excellence.Merit PH: 630-554-6655 P a g e | 1 TABLE OF CONTENTS GENERAL SITE NARRATIVE ............................................................................................................................................ 2 EXISTING SITE CONDITIONS ........................................................................................................................................... 2 PROPOSED SITE CONDITIONS ......................................................................................................................................... 2 APPENDIX Appendix 1: Proposed Detention Exhibit, Rational Method Calculation ATTACHMENTS Attachment 1: Preliminary Engineering Plans MeritCorp Group, LLC College Park Church Outdoor Venue Carmel, Indiana Preliminary Stormwater Narrative Aurora, IL Gurnee, IL Integrity.Precision.Quality.Excellence.Merit 4222 Meridian Parkway – Suite 112, Aurora, Ilinois 60504 - PH: 630-554-6655 P a g e | 2 GENERAL SITE NARRATIVE The subject site will consist of multiple lots situated within the jurisdictional boundaries of Carmel, Hamilton County, Indiana in Section 8, Township 17 North, Range 3 East. The subject development area does not contain wetlands, riparian areas, or floodplain areas. MeritCorp Group, LLC is assisting Aspen Group by preparing planning and engineering documents for the proposed Outdoor Venue. The narratives and subsequent exhibits provided in this Preliminary Stormwater Narrative are provided for Technical Advisory Committee (TAC) and Special Use Approval submittals. EXISTING SITE CONDITIONS The existing College Park Church campus contains the existing church building, surface parking lot, stormwater management facilities, underground utilities and a vacant land area to the north. Adjacent property uses include residential to the north, south (S. of W. 96th Street) and west. The property adjacent to east property line (E. of Towne Road) is a heavily wooded area with Delaware Creek and a large stormwater area connected to the creek. The overall site topography indicates the campus generally drains to the series of stormwater management facilities located along the west property line. The basins include three detention basins that are hydraulically connected with storm pipe. The highwater elevations are tiered and decrease as they drain south and discharge to a series of storm sewers which head east and discharge to an existing swale located at the southeast corner of the site. This swale then discharges to Delaware Creek via culverts. The existing subject development area is the previously mentioned existing vacant area located north of the church and parking lots. The vacant area is generally planned to drain south into existing drainage swales along the south and west sides of the development area. These swales are collected by an existing 18” flared end section located at the southwest corner of the area and discharges to the existing storm sewer system. The storm sewer system discharges to the northernmost basin of the three detention basins located along the west property line. A small portion of the area is wooded and drains north into an existing drainage swale and ultimately drains to Delaware Creek. PROPOSED SITE CONDITIONS Development will primarily be an outdoor venue building, covered patio area and restrooms. Construction will include the construction of a walking path, sanitary and water services to serve the proposed building and an expansion to the existing northernmost detention basin. To the extent possible, the development area will continue to follow the existing drainage patterns and is graded to continue to discharge to the existing swales. Development and the proposed grading have been designed to reduce the areas discharging north. The development area will total approximately 2.26 acres and require detention. The pond addition was calculated using the Rational Method as required in the City of Carmel Stormwater Technical Standards Manual (Refer to the Rational Method Calculation in Appendix 1). As noted above, the northwesternmost detention basin will be expanded to provide an additional 0.16 acre-ft of required detention storage (Refer to the Proposed Detention Exhibit). College Park Church Outdoor Venue Carmel, Indiana Preliminary Stormwater Narrative APPENDIX APPENDIX 1 PROPOSED DEVELOPMENT AREANORTH1" = 60'GRAPHIC SCALECOPYRIGHT C 2022DATE: DESCRIPTION:COLLEGE PARK CHURCH OUTDOOR VENUE 2606 WEST 96TH STREET CARMEL, INDIANAPROJECT NO. M20027 eritCorpM G R O U P , L L CDRAWN BY:JDSCHECKED BY:CLSSHEET NO.1/106/14/2022 ISSUED FOR REVIEW eritCorp Engineering - Planning - Surveying - Environmental M G R O U P , L L C Other Office Locations: Gurnee, IL 4222 Meridian Parkway, Suite 112 Aurora, IL 60504 Office 630.554.6655 Lic. No. 184-005860 www.meritcorp.comPROPOSED DETENTION EXHIBITEXISTING DETENTION VOLUMEPROPOSED POND EXPANSIONDETENTION VOLUME Area Tributary to Site A = 2.26 acres Allowable Release Rate = 0.30 cfs/ac 100-year 100-yr Allowable Release Q= 0.68 cfs C-Value Pavement Area= 0.36 acres 0.85 Building Area= 0.24 acres 0.90 Pervious Area= 1.66 acres 0.20 Composite (C-Value)= 0.38 Storm Runoff Rainfall Drainage Inflow Rate Net allowable Storage Rate Storage Rate Duration Coefficient Intensity Area Qi=C*i100*A Release Rate Qi-Qo (Qi-Qo)*t*60 t (min) C i100 (in/hr) A (acres) (cfs) Qo (cfs)(cfs) (cf) 5.0 0.38 9.12 2.26 7.79 0.678 7.11 2133 10.0 0.38 7.78 2.26 6.64 0.678 5.97 3580 15.0 0.38 6.77 2.26 5.78 0.678 5.10 4593 20.0 0.38 5.99 2.26 5.12 0.678 4.44 5325 30.0 0.38 4.84 2.26 4.13 0.678 3.46 6220 40.0 0.38 4.05 2.26 3.46 0.678 2.78 6674 50.0 0.38 3.47 2.26 2.96 0.678 2.29 6856 60.0 0.38 3.03 2.26 2.59 0.678 1.91 6875 90.0 0.38 2.24 2.26 1.91 0.678 1.23 6669 120.0 0.38 1.87 2.26 1.60 0.678 0.92 6617 180.0 0.38 1.42 2.26 1.21 0.678 0.53 5775 240.0 0.38 1.15 2.26 0.98 0.678 0.30 4379 300.0 0.38 0.97 2.26 0.83 0.678 0.15 2707 360.0 0.38 0.85 2.26 0.73 0.678 0.05 1035 420.0 0.38 0.75 2.26 0.64 0.678 -0.04 -945 480.0 0.38 0.67 2.26 0.57 0.678 -0.11 -3048 540.0 0.38 0.61 2.26 0.52 0.678 -0.16 -5089 600.0 0.38 0.56 2.26 0.48 0.678 -0.20 -7191 720.0 0.38 0.48 2.26 0.41 0.678 -0.27 -11581 1080.0 0.38 0.34 2.26 0.29 0.678 -0.39 -25119 1440.0 0.38 0.27 2.26 0.23 0.678 -0.45 -38657 6875 CF 0.16 AC-FT Detention Storage Calculations for 100-Yr Storm (Based on The City of Carmel Stormwater Technical Standards Manual) REQUIRED STORAGE = REQUIRED STORAGE = 100-YEAR RATIONAL METHOD DETENTION CALCULATIONS Prepared By: CLS Carmel, Indiana Reviewed By: CLS MeritCorp Project Number: M20027 June 14, 2022 College Park Church Outdoor Venue