Design for Water Quality CE 365K Hydraulic Engineering Design Spring 2015 David R. Maidment.

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Presentation transcript:

Design for Water Quality CE 365K Hydraulic Engineering Design Spring 2015 David R. Maidment

Water Quality

Background of Clean Water Act 1972 Clean Water Act prohibits any discharge of pollutants without NPDES permit - (fishable and swimmable) 1987 Clean Water Act amended to require NPDES permits for stormwater discharges Permits require implementation of Best Management Practices (BMPs) to reduce pollutant discharges to “Maximum Extent Practicable”

Location of Impaired Waters

What can we do about water quality? Water quality enhancement structures –Sand filters, wet ponds –Screening inlets to storm sewers –Low Impact Development Total maximum daily load (TMDL) –Comes from Clean Water Act –Pollution load that a water body can accept and still maintain its beneficial uses (aquatic life support, recreation, water supply)

Water Body Impairments on the 303(d) list for Austin area

Water Body Impairments on the 303(d) list for Austin area

Sediment control over Edwards Aquifer Edwards Aquifer rules are part of the water quality standards in Title 30 of the Texas Administrative Code and are set out by TCEQ to help protect water quality in the Edwards Aquifer Chapter 3 has design guidance

Best Management Practices for Sediment Control

Extended Detention Basin

Grassy Swale

Vegetative Filter Strips

Sand Filters

Bioretention

Wet Basin

Constructed Wetland

Cartridge Filter System

Permeable Pavement

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