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Contact Us
Director's Office
Municipal Plaza Building
114 W. Commerce
San Antonio, Texas 78205
Main Line: (210) 207-8022
Fax: (210) 207-4406

Drainage Management

Storm Water Maintenance Summary

The Department of Public Works is responsible for maintaining our City’s storm water drainage system and engineering improvement projects to help reduce flooding during rain events. These efforts include maintaining drainage infrastructure such as: maintaining natural and concrete-lined channels, channel concrete repair, street sweeping and sidewalk cleaning in the Downtown area, and Right of Way and median vegetation maintenance. We also review residential and commercial storm water development plans to ensure future construction projects and private development do not adversely impact current drainage systems. If there is a resource that would be helpful to you and it is not available, please let us know by contacting us at

Flood Insurance Image   Flood Maps
Digital Flood Insurance Rate Maps (DFIRM) approved by the Federal Emergency Management Agency (FEMA)
311   311 City Connect
To submit a storm water related service request, please call 311 or make a report on line through City Connect – Online Services
Flood Maps   National Flood Insurance Program (NFIP)
Federally regulated insurance program which allows the City to enforce floodplain management standards and allows property owners and renters to purchase flood insurance
Elevation Certificate   Elevation Certificate
FEMA, National Flood Insurance Program - Elevation Certificate and instructions
Drainage Terms   Drainage Terms
A glossary of key drainage terms


Storm Water Maintenance Snapshot

We maintain:

  • 3,340 acres of Earthen Drainage Channels or 400 miles of Earthen Drainage Channels
  • 140 miles of Concrete Drainage Channels
  • 1,195 acres of Street Rights of Way
  • 719 individual Medians totaling 167 acres
  • 317 individual Flood Buyout Properties totaling 111 acres
  • 192 miles of Natural Waterways (104 miles maintained by internal crews and 88 miles maintained by contract services)
  • 581 miles of Underground Storm Sewers


We sweep and clean:

  • 2,366.76 gutter miles Arterial/Collector Streets
  • 6,580.88 gutter miles Residential Streets
  • 106.18 gutter miles of Streets in Central Business District (CBD)
  • 8,000 Storm Sewer Inlets

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