Delaware

BMP Standards and Specifications — 13.0 Wet Ponds

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DRAFT public-notice chapter (source PDF: 13-0-Wet-Ponds-DRAFT-strikethrough.pdf) — not a final adopted manual by itself. Covers only Wet Ponds post-construction BMP standards. RPv/Cv/Fv event definitions and numeric depths are referenced to the Delaware Sediment and Stormwater Regulations rather than fully specified here; only the 100-year flooding-event storage limit is explicit. No required hydrologic/hydraulic software named. No adoption/effective date in text.

Fields not found in document: document_metadata.adoption_or_effective_date, document_metadata.last_revised_date, design_criteria.required_hydrologic_hydraulic_software

Document Metadata

Jurisdiction level

state

“Wet Ponds constructed to meet regulatory stormwater management requirements in the State of Delaware”
Section 13.2

State

Delaware

“design shall be provided to DNREC or their delegated Agency.”
Section 13.6, Liners

Version / edition

Section 13.0 Wet Ponds (DRAFT strikethrough public-notice revision)

“13.0 Wet Ponds”
Section 13.0; source PDF filename 13-0-Wet-Ponds-DRAFT-strikethrough.pdf

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“Additionally, Wet Quantity Management Ponds and Wet ED Ponds should be sized to manage the Conveyance Event and Flooding Event as required in accordance with the Delaware Sediment and Stormwater Regulations.”
Section 13.6

Design Criteria

Design storm return periods (years)

100-year

“The total storage, including any ponding for larger flooding events (100-year storm) should not extend more than 5 feet above the permanent pool unless specific design enhancements to ensure side slope stability, safety, and maintenance are identified and approved.”
Section 13.6, Maximum Extended Detention Levels

Water quality volume method

Wet ED Ponds receive RPv credit by providing 48-hour extended detention of the Resource Protection Volume (RPv); Wet Quantity Management Ponds used solely for quantity management receive 0% RPv retention credit. Exact RPv depth/volume definition is deferred to the Delaware Sediment and Stormwater Regulations (not restated in this chapter).

“A Wet ED Pond differs from a typical Wet Quantity Management Pond in that a Wet ED Pond provides 48-hour detention of all or a portion of the Resource Protection Volume (RPv).”
Section 13.0

Peak flow calculation method(s)

Site-adjusted runoff curve number (RCN) reflecting upland volume reduction when computing Cv and Fv, Outflow hydrograph peak discharge not exceeding five times the average discharge rate (for 48-hour RPv extended detention)

“For treatment train designs where upland practices are utilized for treatment of the resource protection storm (RPv), designers can use a site-adjusted runoff curve number (RCN) that reflects the volume reduction of upland practices to compute the Cv and Fv that will be treated by the Wet Pond.”
Section 13.6

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Wet Quantity Management Pond (13-A), Wet Extended Detention (ED) Pond (13-B)

“Design variants include: 13-A Wet Quantity Management Pond; 13-B Wet Extended Detention (ED) Pond”
Section 13.0