The Department of Natural Resources and Environmental Control (DNREC) Division of Watershed Stewardship Sediment and Stormwater Program has released new and revised regulatory guidance documents for public review. These documents support Regulation No. 5101 Sediment and Stormwater Regulations (DSSR), as set forth at 7 Del.C. §4006(h) and (i).

The new and revised regulatory guidance documents, and brief descriptions follow:

• Regulatory Guidance Memo 6 (RGM-6): Extended Detention RPv Credit and Design Procedures, provides background on the regulatory requirements for managing RPv credits, defines how RPv credit is quantified, and establishes procedures for demonstrating compliance and RPv credit when utilizing extended detention BMPs.
• DURMMv2.6 (EXCEL) combines the two current versions of DURMMv2.51 into a single workbook, modifies the computation for submerged gravel wetland, reduces the number of BMPs computed in series, and provides additional tools to demonstrate compliance for extended detention BMPs in accordance with RGM-6.
• Summary Table for Site RPv Compliance (EXCEL) has revised notes to reference DURMMv2.6.

The DNREC Sediment and Stormwater Program hereby provides notice of these regulatory guidance documents, pursuant to 7 Del.C. §4006(i), which incorporates the provisions of 7 Del.C. §6004. A public hearing will NOT be held unless the Secretary receives a meritorious request for a hearing within 15 days of date of this notice, ending July 16, 2026. A request for a public hearing shall be in writing and show familiarity with the regulatory guidance document and provide a reasoned statement of the regulatory guidance document’s probable impact.

These documents and supporting information may be reviewed at the following link: dnrec.delaware.gov/watershed-stewardship/sediment-stormwater.

Questions regarding the revised regulatory guidance documents may be directed to Bonnie Arvay, bonnie.arvay@delaware.gov.

Related Topics:  permitting and regulation, public comment, public notice, public review, sediment and stormwater, watershed stewardship