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Nj future redevelopment forum 2019 adams

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Michele Adams presentation for stormwater management session at Redevelopment Forum 2019.

Published in: Government & Nonprofit
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Nj future redevelopment forum 2019 adams

  1. 1. NJDEP’S NEW PROPOSED STORMWATER RULE Michele Adams, PE LEED AP Meliora Design michelea@melioradesign.com
  2. 2. Proposed changes published December 3, 2018 https://www.nj.gov/dep/rules/notices/20181203a.html Written comments until February 1, 2019 This is the first of additional updates and changes the Department is considering. TIMELINE
  3. 3. REMOVED: Identify non-structural stormwater management strategies and require that they be incorporated into the design of major development to the “maximum extent practicable” N.J.A.C. 7:8-5.3 ADDED: Minimum Standards for groundwater recharge, stormwater runoff quality, and stormwater runoff quantity shall be met using green infrastructure. Updating definitions, minor changes, and cross-references KEY PROPOSED CHANGES FOR MAJOR DEVELOPMENTS
  4. 4. APPLICABLE TO MAJOR DEVELOPMENT MAJOR DEVELOPMENT • Disturbing 1 or more acres of land or • Increasing Impervious by one quarter acre or more • One-quarter acre or more of “regulated motor vehicle surfaces” • Government projects included
  5. 5. MODIFIED AND ADDED DEFINITIONS GREEN INFRASTRUCTURE Manages Stormwater close to its source by: 1. Treating stormwater runoff through infiltration into subsoil 2. Treating stormwater runoff through filtration by vegetation or soil 3. Storing stormwater runoff for reuse
  6. 6. Porous Paving Conventional Paving “The use of Green Infrastructure BMPs such as Pervious Paving, Infiltration Basins, and Bioretention Systems will more effectively achieve the Department’s goals under existing rules.”
  7. 7. Pervious Paving Pervious Paving Conventional Paving
  8. 8. Infiltration Basins
  9. 9. Bioretention
  10. 10. • Groundwater Recharge • Retain 100% average annual preconstruction GW recharge or • Recharge 2-year net increase, pre- to post-development • Stormwater Runoff Quantity • Maintain 2-, 10-, and 100-year pre- to post hydrographs • Maintain 2-, 10-, and 100-year pre- to post peak rates and no downstream damage • Peak rates reduced 50%, 75%, and 80% for 2-, 10-, and 100 year events • Tidal Hazard areas – downstream impacts MINIMUM STANDARDS FOR GROUNDWATER RECHARGE AND STORMWATER RUNOFF QUANTITY UNCHANGED
  11. 11. “applicable when the major development results in an increase of ¼ acre or more of regulated vehicle surface” • 1.25-inch water quality design storm MINIMUM STANDARD FOR STORMWATER RUNOFF QUALITY MODIFIED AS FOLLOWS:
  12. 12. OTHER MODIFIED AND ADDED DEFINITIONS CONTRIBUTARY DRAINAGE AREA Area from which stormwater runoff drains to a stormwater management measure, not including the area of the stormwater management area itself.
  13. 13. OTHER MODIFIED AND ADDED DEFINITIONS MOTOR VEHICLE SURFACE • Used by Motor Vehicles • Pervious or Impervious REGULATED IMPERVIOUS SURFACE (new) • Net increase in impervious • Total area of impervious surface collected by new stormwater system • Total area of impervious surface to be collected by an existing system • Total area of impervious surface collected by an existing stormwater conveyance system where the capacity of that system is increased. OTHERS • Tidal Flood Hazard Area, Water Control Structure, Community Basin, Disturbance
  14. 14. (Continued)
  15. 15. • Guidance to municipalities on mitigation (offsetting) • Guidance on Community Basins for municipalities to address flooding and CSOs OTHER PROPOSED CHANGES FOR MAJOR DEVELOPMENTS
  16. 16. SOCIAL ECONOMIC ENVIRONMENTAL BENEFITS • Reduce Flooding • Improve Water Quality • Increasing Groundwater Recharge • Protecting Stream Channel Integrity • Reducing Erosion • Maintaining Adequacy of Bridges and Culverts • Improving Air Quality • Reducing Heat Island • Decreasing Energy Use A Triple Bottom Line approach
  17. 17. Questions?

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