Harris County

Harris County Low Impact Development & Green Infrastructure Design Criteria for Storm Water Management

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Compare each cited field to the official PDF before relying on it. What this means

LID/GI design criteria (2011). Full HCFCD PCPM remains portal-gated; this PDF covers SWQ 1" treatment and LID IMPs used with county detention criteria. Pipeline excerpt repair removed 4 unlocated citation(s).

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

Other manuals in Texas: City of Amarillo, City of Arlington, City of Austin, City of Beaumont / Jefferson County Drainage District No. 6, City of Brownsville, City of College Station, City of Corpus Christi, City of Denton, City of El Paso, City of Fort Worth, City of Frisco, City of Garland, City of Grand Prairie, City of Houston, City of Killeen, City of Laredo, City of Lubbock, City of McAllen, City of McKinney, City of Mesquite, City of Pasadena, City of Pearland, City of Plano, City of Round Rock, City of San Antonio, City of Waco, Dallas / North Central Texas (iSWM), Tarrant County, Texas, Texas Commission on Environmental Quality

Document Metadata

Jurisdiction level

Not found in document

No evidence cited

State

Texas

“Harris County Flood Control District”
Cover

Version / edition

Not found in document

No evidence cited

Adoption / effective date

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No evidence cited

Last revised date

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Relationship to state manual

independent

“interim guidelines ... HCPID-AED and HCFCD Storm Water Management Programs”
Background

Design Criteria

Design storm return periods (years)

Not found in document

No evidence cited

Water quality volume method

Projects exceeding one acre require a Storm Water Quality (SWQ) Permit and SWQMP; treat the first 1 inch of runoff. LID IMPs (bioretention, vegetated swales, permeable pavement, rainwater harvesting, green roofs, filter strips, planters, tree box filters) may satisfy quality and detention credits per Table 1. Conventional gravity detention minimum rate 0.55 ac-ft per acre (Table 3); LID projects may use reduced detention with approved low-impact approach.

“Treatment of the first 1" of runoff ... Storm Water Quality Permit required”
Table 5 / §2.4

Peak flow calculation method(s)

Detention and hydrograph matching per HCPID-AED / HCFCD requirements, Minimum detention 0.55 ac-ft/acre for gravity systems

“The minimum detention rate for gravity drained detention basin systems is 0.55 ac-ft”
Table 3

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Disconnection of roof runoff and impervious surfaces, Vegetated filter strip, Vegetated swale / bioswale, Rainwater harvesting, Bioretention systems, Permeable pavement, Tree box filter, Storm water planter box, Green roof

“Roof Runoff & Impervious Surfaces 3.2 Vegetated Filter Strip 3.3 Vegetated Swale 3.4 Rainwater Harvesting 3.5 Bioretention Systems 3.5.1 Requirements 3.5.2 Sizing a Bioretention system 3.5.3 Engineered Soil Media 3.5.4 Underdrain 3.5.5 Observation/Cleanout Pipe 3.5.6 Positive O”
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