Stormwater Mitigation Worksheet

Transcription

1 Planning & Development Dept. Infrastructure Division P.O. Box 11706, or 155 Johnston Street Rock Hill, South Carolina Phone: FAX: Date Received: _ Stormwater Mitigation Worksheet CRH Plan Review # Project Name/Phase: _ Date: _ Instructions: Insert worksheet into the Stormwater (SWPPP) Report, after Narrative. Include a separate worksheet for each stage of construction, as applicable. Summary and defining parameters shall be provided for each DB (detention basin) PLPD or AP (property line point of discharge or analysis point), pre and post development, and correspond with the report maps and calculations. Stormwater (SWPPP) Report must include page numbers for reference. Construction Stage: Erosion Control (initial stage) Post Construction (final stage) SCS Type II Distribution: 6 HR 24 HR Receiving Watershed or Waterbody: Stormwater Analysis Model Node Diagram Attached (with corresponding labels) List all DB and/or PLPD or AP s: Label Description & Location Check here if a detention waiver is requested for any, or all PLPD s. Detention waivers must be in accordance with Article of the Rock Hill Zoning Code and shall include a Detention Waiver Worksheet. List applicable PLPD s: South Carolina Certificate of Authorization Engineer s Seal & Signature X:\PLNDCC\Planpdf\STORMWATER_MITIGATION_WORKSHEET_PlanDev_ doc Page 1 of 5 5/18/15

2 DB (PLPD, as applicable): Summary Table Report Page # Ref. 2 yr _ cfs cfs cfs _ ft. _ ac ft 10 yr _ cfs cfs cfs _ ft. _ ac ft 25 yr _ cfs cfs cfs _ ft. _ ac ft 100 yr _ cfs cfs cfs _ ft. _ ac ft Top of Dam: Elev. ft., Area acres, Volume ac ft Spillway: Elev. ft., Volume ac ft Wet Basin Dry Basin Level Spreader/Veg. Filter Strip Sand Filter Prefabricated Device Other Wet Basin Mosquito Prevention Measure: Basin Elevation for Volume Requirement: _ ft DB (PLPD, as applicable): Summary Table Report Page # Ref. 2 yr _ cfs cfs cfs _ ft. _ ac ft 10 yr _ cfs cfs cfs _ ft. _ ac ft 25 yr _ cfs cfs cfs _ ft. _ ac ft 100 yr _ cfs cfs cfs _ ft. _ ac ft Top of Dam: Elev. ft., Area acres, Volume ac ft Spillway: Elev. ft., Volume ac ft Wet Basin Dry Basin Level Spreader/Veg. Filter Strip Sand Filter Prefabricated Device Other Wet Basin Mosquito Prevention Measure: DB (PLPD, as applicable): Summary Table Report Page # Ref. 2 yr _ cfs cfs cfs _ ft. _ ac ft 10 yr _ cfs cfs cfs _ ft. _ ac ft 25 yr _ cfs cfs cfs _ ft. _ ac ft 100 yr _ cfs cfs cfs _ ft. _ ac ft Top of Dam: Elev. ft., Area acres, Volume ac ft Spillway: Elev. ft., Volume ac ft Wet Basin Dry Basin Level Spreader/Veg. Filter Strip Sand Filter Prefabricated Device Other X:\PLNDCC\Planpdf\STORMWATER_MITIGATION_WORKSHEET_PlanDev_ doc Page 2 of 5 5/18/15

3 Wet Basin Mosquito Prevention Measure: Attach additional DB Summary Tables, as required. PLPD or AP: Summary Table Report Page # Ref. 2 yr _ cfs cfs ft. 10 yr _ cfs cfs ft. 25 yr _ cfs cfs ft. 100 yr _ cfs cfs ft. Description of Analysis Point: Wet Basin Dry Basin Level Spreader/Veg. Filter Strip Sand Filter Prefabricated Device Other or N/A Wet Basin Mosquito Prevention Measure: PLPD or AP: Summary Table Report Page # Ref. 2 yr _ cfs cfs ft. 10 yr _ cfs cfs ft. 25 yr _ cfs cfs ft. 100 yr _ cfs cfs ft. Description of Analysis Point: Wet Basin Dry Basin Level Spreader/Veg. Filter Strip Sand Filter Prefabricated Device Other or N/A Wet Basin Mosquito Prevention Measure: PLPD or AP: Summary Table Report Page # Ref. 2 yr _ cfs cfs ft. 10 yr _ cfs cfs ft. 25 yr _ cfs cfs ft. 100 yr _ cfs cfs ft. Description of Analysis Point: _ X:\PLNDCC\Planpdf\STORMWATER_MITIGATION_WORKSHEET_PlanDev_ doc Page 3 of 5 5/18/15

4 Wet Basin Dry Basin Level Spreader/Veg. Filter Strip Sand Filter Prefabricated Device Other or N/A Wet Basin Mosquito Prevention Measure: Attach additional PLPD/AP Summary Tables, as required. DB, PLPD or AP: Summary of Sub Basin Parameters Include all page number references for corresponding Stormwater Report calculations. Hydrologic Soil Group (contributing area) % of each: A B C D pg # Downstream Limiting Factors: Pre Development Post Development Total Basin Area: acres acres Sub Basin Designation: Sub Basin Designation: Sub Basin Designation: Sub Basin Designation: Sub Basin Designation: Sub Basin Designation: X:\PLNDCC\Planpdf\STORMWATER_MITIGATION_WORKSHEET_PlanDev_ doc Page 4 of 5 5/18/15

5 Sub Basin Designation: Attach additional Sub Basin Summaries, as required. X:\PLNDCC\Planpdf\STORMWATER_MITIGATION_WORKSHEET_PlanDev_ doc Page 5 of 5 5/18/15