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NJAFM 2012 A NNUAL C ONFERENCE S TORMWATER M ANAGEMENT II S TORMWATER M ANAGEMENT T ECHNIQUES

NJAFM 2012 A NNUAL C ONFERENCE S TORMWATER M ANAGEMENT II S TORMWATER M ANAGEMENT T ECHNIQUES F OR S INGLE F AMILY H OMES H ORMOZ P AZWASH , P H .D., P.E., F.ASCE, D.WRE O CTOBER 2, 2012. S TATE O F A RT P RACTICES OBJECTIVES

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NJAFM 2012 A NNUAL C ONFERENCE S TORMWATER M ANAGEMENT II S TORMWATER M ANAGEMENT T ECHNIQUES

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  1. NJAFM 2012 ANNUAL CONFERENCE STORMWATER MANAGEMENT II STORMWATER MANAGEMENT TECHNIQUES FOR SINGLE FAMILY HOMES HORMOZ PAZWASH, PH.D., P.E., F.ASCE, D.WRE OCTOBER 2, 2012

  2. STATE OF ART PRACTICES OBJECTIVES LID/GREEN DEVELOPMENT/SUSTAINABLE DEVELOPMENT REDUCE IMPERVIOUS COVERAGE AND RUNOFF ON A LOT/SITE BASIS PROPER CRITERION OF DEVELOPMENT IMPACT LAND DISTURBANCE AND IMPERVIOUS COVERAGE PER CAPITA BASIS INTRODUCED BY: HORMOZ PASWASH IN HIS 2011 BOOK: “URBAN STORM WATER MANAGEMENT”

  3. IMPACTS OF SINGLE FAMILY HOMES • Storm Water Management Regulations Cover Major Developments. • Single Family Homes Form Majority of Developments (Impervious Coverage), However, They Are Free From State Regulations. • Older Homes Generally Have No Provision for Stormwater Management. • Newer Homes (Which are Becoming Increasingly Larger in Dwelling Footprint) Seldom Incorporate Any Measure to Control Either the Peak or Volume of runoff. • Single Family Homes are the Culprit of Flooding Problems. (See the Next Two Tables)

  4. Table 2OVERALL PER CAPITA IMPERVIOUS COVERAGESINGLE FAMILY HOMES Table 1LOT IMPERVIOUS COVERAGESINGLE FAMILY HOMES * Based on family of 4 for smaller than 1 acre and family of 5 for 1 and 2 acre lots.

  5. PER CAPITA IMPERVIOUS COVERAGEMulti Family Residential Developments Example: Cambridge Crossings, Clifton, NJ Site Area = 42.5 Acres Development Area = 28.4 Acres Impervious coverage = 15.6 Acres * (including streets) No. of Units = 640 One/two bedrooms Households (2.2 per unit) = 1408 Per Capita Disturbance = 483 ft2/capita * Pre-existing impervious coverage = 20.3 acres

  6. PER CAPITA IMPERVIOUS COVERAGE6 Story Apartment Buildings Estimate 1500 SF Apt. (50’ x 30’ Flat) 2 Household / Apt. Households 12 / 1500 SF Foot Print Street 12 x 50 = 600 SF Total Imp. Area = 2100 SF Per Capita Imp. = 2100:12 = 175 SF/capita High Rises < 100 SF/capita

  7. Proposed Storm Water Management MeasuresFor Single Family Homes A. Disconnection of Roof Leaders (Downspots) From Driveways: Redirecting Runoff to Lawn/Landscape Area Photo 1, Roof Drain Photo 2, Own Home The Universal Runoff Model Introduced by the Author in 2009 Provides Means of Estimating This Effect. For More Information on This Model (Method), See 2011 Urban SWM Book B. Directing Roof Drains to Lawn Depression, Rain Gardens Photo 3 (Lawn Depression, Hawthorne Ambulance Corp.) Photo 4 Rain Garden (Planted Depression in Own Backyard C. Retaining Roof Runoff in Seepage Pits/Chambers Photos 5 and 6 D. Harvesting Roof Rain in Rain Tanks (Above Ground) or Underground Cisterns E. Using Pavers (Open Joint) for Driveways, Patios and Walks Photo 7

  8. RECOMMENDATIONS Adopting an Ordinance Requiring Zero Increase in Runoff Volume For Single Family Homes Design Storm, 10 Year – 60 Minute Storm (2-Inch Rainfall)

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