City of North Little Rock

Stormwater Best Management Practices

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Construction-phase BMP manual for North Little Rock MS4 (Chapter 14). Explicitly states this edition focuses primarily on construction-phase controls; post-construction design storms, peak-flow methods, and hydrologic software are not specified. Sediment trap sizing uses ½-inch runoff over 24 hours; 0.5-inch rainfall is an inspection trigger, not a return-period design storm.

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

Document Metadata

Jurisdiction level

municipality

“as mandated by the City’s Municipal Separate Storm Sewer System (MS4) permit”
Cover

State

Arkansas

“Arkansas Department of Environmental Quality’s General Permit for Small MS4s”
Section 1.2

Version / edition

2025

“City of North Little Rock2025”
Cover

Adoption / effective date

2025

“City of North Little Rock2025”
Cover

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“This manual is issued under the authority of the City of North Little Rock’s Stormwater Ordinance (Chapter 14 of municipal code) and supports the City’s responsibilities as a regulated Municipal Separate Storm Sewer System (MS4)”
Section 1.2

Design Criteria

Design storm return periods (years)

Not found in document

No evidence cited

Water quality volume method

Construction-focused manual; no post-construction water quality volume formula. Temporary sediment traps/basins sized for settling and storage zones of at least 70 CY/acre and 53 CY/acre of contributing drainage area, respectively, based on ½ inch of runoff volume over a 24-hour period. Site BMPs must be inspected every seven calendar days and within 24 hours of a rainfall event of 0.5 inches or greater.

“Size traps to accommodate both a settling and storage zone with minimum volumes of 70 CY/acre and 53 CY/acre of contributing drainage area, respectively, based on ½” of runoff volume over a 24-hour period.”
Section 3.3.5 Sediment Basins

Peak flow calculation method(s)

Not found in document

No evidence cited

Required hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Mulch and Straw Cover, Rolled Erosion Control Practices (RECP), Wetting / Dust Control, Outlet Protection, Inlet Protection, Silt Fence, Compost Socks, Sediment Basins / Sediment Traps, Construction Entrance/Exit, Runoff Control – Ditches and Check Dams, Concrete Washouts, Spill Prevention, Stockpile Management

“3.2 Erosion Control Practices ... 3.3 Sediment Control Practices ... 3.4 Good Housekeeping Measures ... Mulch & Straw Cover ... RECP ... Outlet Protection ... Inlet Protection ... Silt Fence ... Compost Socks ... Sediment Basins ... Construction Entrance ... Concrete Washouts”
Table of Contents; Sections 3.2–3.4