City of College Station
iSWM Criteria Manual for Site Development and Construction
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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 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), Harris County, Tarrant County, Texas, Texas Commission on Environmental Quality
Document Metadata
Jurisdiction level
City
No evidence cited
State
Texas
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Version / edition
Revised January 2015 (December 2009 base)
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Adoption / effective date
2015-01
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Last revised date
2015-01
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Relationship to state manual
adopts state manual directly
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Design Criteria
Design storm return periods (years)
1-year, 25-year, 100-year
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Water quality volume method
Water Quality Protection Volume (WQv) based on 1.5 inches of rainfall (85th percentile storm), not a return-period storm. Option 2: treat WQv by reducing TSS from the development site for runoff from rainfalls up to 1.5 inches. Primary structural controls sized for WQv are expected to remove about 70–80% of annual average TSS load when designed per specifications. Methods to compute WQv referenced to Water Quality Technical Manual Section 1.2.
No evidence cited
Peak flow calculation method(s)
Rational Method, SCS Unit Hydrograph Method, Streambank Protection: control 1-year, 24-hour storm (Streambank Protection Volume / SPV), including 24-hour extended detention option, Conveyance: 25-year, 24-hour storm, Flood Mitigation: 100-year, 24-hour storm, Downstream assessment required for streambank protection, conveyance, and flood mitigation
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Hydrologic/hydraulic software
Not found in document
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Approved BMP categories
Bioretention, Enhanced swales (dry, wet, wetland), Detention, Filter strips, Sand filters / filter boxes, Infiltration wells and trenches, Ponds, Porous surfaces, Green roofs, Rainwater harvesting, Wetlands, Submerged gravel wetlands, Alum treatment, Proprietary systems
No evidence cited