Storm Con 2008 LID Presentation LID
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Presentation of a StormCon 2008 Paper on LID Site Design - Separating the Possible from the Impossible
Storm Con 2008 LID Presentation LID
- 1. Main Office: 128 Cockeysville Road, Suite 200 Hunt Valley, Maryland 21030 410.785.0875 Northeast Office: 31 Gardiners Lane Hampton Bays, NY 11946 410.703.4936 LOW IMPACT DEVELOPMENT SITE DESIGN SEPARATING THE POSSIBLE FROM THE IMPOSSIBLE August 6, 2008 Theodore E. Scott, CPESC, PE T.E. Scott & Associates, Inc. Stormwater Maintenance, LLC tes@MdSWM.com www.SWMaintenance.com www.AppliedStormwater.com PRESENTATION LID R41
- 2. LOW IMPACT DEVELOPMENT SITE DESIGN INTRODUCTION 1999 Prince George¡¯s County Maryland LID Low Impact Development Hydrologic Criteria Replicate Existing Hydrology Utilize Numerous Micro Scale Measures National Hydrology Manual TSA TOOLS LID Module PRESENTATION LID R41
- 3. LOW IMPACT DEVELOPMENT SITE DESIGN DESIGN EXAMPLE Actual Project 3 Lot Residential Maryland 2000 Regulations ¨C CWP 1-Year Design Storm 1.75 acres LID Existing Conditions Wooded PRESENTATION LID R41
- 4. LOW IMPACT DEVELOPMENT SITE DESIGN EXISTING CONDITIONS METHODOLOGY Small Runoff Volumes Very Low Discharges TR55 Basis RCN Adjustment Limitations PRESENTATION LID R41 0.10 645 0.10 .19 55 1.75 Peak Discharge Rate (cfs) Runoff Volume (cf) Runoff Depth (in) Tc (hrs) Runoff Curve Number Area (acres)
- 5. LOW IMPACT DEVELOPMENT SITE DESIGN PROPOSED CONDITIONS PRESENTATION LID R41
- 6. LOW IMPACT DEVELOPMENT SITE DESIGN PROPOSED CONDITIONS Direct Runoff No Measures Proposed PRESENTATION LID R41 0.93 3074 0.48 .17 69 1.75 Peak Discharge Rate (cfs) Runoff Volume (cf) Runoff Depth (in) Tc (hrs) Runoff Curve Number Area (acres)
- 7. LOW IMPACT DEVELOPMENT SITE DESIGN DISCONNECTION BASED PRACTICES PRESENTATION LID R41
- 8. LOW IMPACT DEVELOPMENT SITE DESIGN DISCONNECTION BASED PRACTICES No Practices: With Disconnection Practices SATISFIES MARYLAND CWP CRITERIA PRESENTATION LID R41 0.93 3074 0.48 .17 69 1.75 Peak Discharge Rate (cfs) Runoff Volume (cf) Runoff Depth (in) Tc (hrs) Runoff Curve Number Area (acres) 0.62 2329 0.437 .17 66 1.75 Peak Discharge Rate (cfs) Runoff Volume (cf) Runoff Depth (in) Tc (hrs) Runoff Curve Number Area (acres)
- 9. LOW IMPACT DEVELOPMENT SITE DESIGN DISCONNECTION BASED PRACTICES PRESENTATION LID R41
- 10. LOW IMPACT DEVELOPMENT SITE DESIGN VOLUME BASED PRACTICES PRESENTATION LID R41
- 11. LOW IMPACT DEVELOPMENT SITE DESIGN VOLUME BASED PRACTICES No Practices: With Disconnection and Volume Practices PRESENTATION LID R41 0.93 3074 0.48 .17 69 1.75 Peak Discharge Rate (cfs) Runoff Volume (cf) Runoff Depth (in) Tc (hrs) Runoff Curve Number Area (acres) 0.10 592 0.09 .17 54 1.75 Peak Discharge Rate (cfs) Runoff Volume (cf) Runoff Depth (in) Tc (hrs) Runoff Curve Number Area (acres)
- 12. LOW IMPACT DEVELOPMENT SITE DESIGN VOLUME BASED PRACTICES PRESENTATION LID R41
- 13. LOW IMPACT DEVELOPMENT SITE DESIGN COMPOSITE PLAN DISTRIBUTED? PRESENTATION LID R41
- 14. LOW IMPACT DEVELOPMENT SITE DESIGN IS LID POSSIBLE IN MAINSTREAM DESIGN STUDIOS? Aggressive Hydrologic Goals Multiple Practices Microscale / Grading On-Lot Maintenance / Replacement As-Built Homeowner Responsibility PRESENTATION LID R41
- 15. LOW IMPACT DEVELOPMENT SITE DESIGN LID SITE DESIGN VS LID PRACTICES PRESENTATION LID R41
- 16. Main Office: 128 Cockeysville Road, Suite 200 Hunt Valley, Maryland 21030 410.785.0875 Northeast Office: 31 Gardiners Lane Hampton Bays, NY 11946 410.703.4936 THANK YOU LOW IMPACT DEVELOPMENT SITE DESIGN SEPARATING THE POSSIBLE FROM THE IMPOSSIBLE August 6, 2008 Theodore E. Scott, CPESC, PE T.E. Scott & Associates, Inc. Stormwater Maintenance, LLC tes@MdSWM.com www.SWMaintenance.com www.AppliedStormwater.com PRESENTATION LID R41