[vc_row full_width=”stretch_row_content_no_spaces”][vc_column][vc_column_text]Rescue after Hurricane Ida[/vc_column_text][vc_raw_html]JTNDZGl2JTIwY2xhc3MlM0QlMjJjYXJvdXNlbC1jYXB0aW9uJTIwZC1tZC1ibG9jayUyMGQtc20tYmxvY2slMjIlM0UlMEElM0NoMSUzRUxlc3NvbnMlMjBmcm9tJTIwVHJvcGljYWwlMjBTdG9ybSUyMElkYSUzQyUyRmgxJTNFJTBBJTNDJTJGZGl2JTNF[/vc_raw_html][/vc_column][/vc_row][vc_row][vc_column][breadcrumb-shortcode][/vc_column][/vc_row][vc_row][vc_column width=”2/3″][vc_column_text]

Directly Resulted in The Loss of Thirty Lives

Record Rainfalls

  • Newark experienced an all-time record for highest one-hour rainfall total (3.65 inches)
  • Documented 10+ inches of rainfall in parts of Hunterdon, Essex, Middlesex and Union Counties

Severe Flash Flooding Due to Intense Precipitation

  • Storm sewers were overwhelmed
  • Streams and rivers couldn’t convey so much water in such a short time
  • More than 12 rivers exceeded their 100-year flood levels

Ida Compared with Existing Flood Hazard Rules

The current FHACA Rules set the design flood elevation (DFE) as the higher of:

  • Flood elevation mapped by NJDEP
  • FEMA 100-year elevation plus 1 ft

Ida case studies show average elevations of 3.1 feet above FEMA’s 100-year flood elevation

New Design Flood Elevation (DFE)

  • To help protect communities from future flood damage, the DFE along streams and rivers will be raised by 2 ft above current standard.
  • New DFE is the higher of:
    • Flood elevation mapped by NJDEP (where available) plus 2 ft
    • FEMA 100-year elevation plus 3 ft
  • When calculating flow rates to determine DFE:
    • Compute flow rates based on future anticipated 100-year precipitation
    • Model design flood based on 125% of the computed flow rates

New Stormwater Management Standards

  • Account for existing increased rainfall and prepare for likely further increases results in nominal additional effort or cost during development
  • Achieve greater runoff and flood control with, for example, a 2% increase in the amount of property required for stormwater controls
  • Deploy regulation consistent with Governor EO 100 approach of utilizing flexible standards commensurate with risk recognizing that no one-size fits all
  • See potential increases in the size of stormwater BMPs to accommodate the adjusted rainfall amounts for a warehouse development in examples below

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