(Best Management Practices) for Development in the Hill Country

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LCRA Highland Lakes Watershed Ordinance

Performance Standards Overview

How Does Stormwater Pollution Affect Our Waterways?

      Siltation of creeks and reservoirs Reduced fish and wildlife habitat Algal blooms and fish kills Increased growth of aquatic weeds Reduced recreational opportunities because of bacterial contamination Contamination of food and water sources

HLWO Jurisdictional Area

    Travis County (Lake Travis Watershed) Llano County (portion) Burnet County (Colorado River Watershed) Total Area 1,172 sq. mi.

What is regulated?

      Development (single family, subdivisions, multi-family, and commercial) that adds more than 10,000 sq. ft. of impervious cover or disturbs more than 1 acre of land Mine or Quarry projects that create more than 10,000 sq. ft. of impervious cover or disturb more than 5 acres of land Utility line construction and maintenance Dredge and Fill Standards (No permit required) Exemptions No Permit Required

HLWO Performance Standards

Performance Standards

• Pre-development Planning • Water Quality Management information • Buffer Zones • Construction- Phase Erosion and Sediment Control • Water Quality Education

Minimum Requirements

Meeting with LCRA staff to review project Plan showing drainage layout and BMP design Plan showing buffer zones for creeks, and buffer zone protection measures Construction-phase erosion control plan with details and specifications Contact LCRA to initiate education program

Permanent BMPs to Manage Hydrology and Water Quality

• Design objective – manage Streambank Erosion and Stormwater Pollutant Removal by intercepting and treating a water quality volume • Design Storm – 1 year, 3 hour – 1.93” • BMP Suites- primary and secondary BMPs • Primary BMPs (water quality basins) • Secondary BMPs (filter strips & infiltration devices) • BMPs placed in series to manage channel erosion and treat runoff quality • Pollutant removal performance – remove 70-75% of TSS, TP, oil and grease

Permanent Water Quality Basins • Bioretention basins (stand – alone) • Extended detention basins* • Sand filters* • Wet ponds (stand-alone with vegetated bench) • Wetland basins • Retention – irrigation (stand – alone) • Infiltration systems (secondary only) *must be combined with a secondary BMP

Marble Falls – Edwards Offices

Stand-alone bioretention basin Vegetated filter strip for driveway

Marble Falls – RSC Equipment – ED pond with secondary bioretention

Questions ??

Contacts LCRA Watershed Engineering & Planning 512-473-3200 Ext. 2324 Supervisor: Erik Harris, P.E.

Ext. 2091 Permit Review: Adam Boatright, P.E. Dean Thomas, P.E.

Ext. 4080 Ext. 2892 Inspections: Supervisor: David Williams Mark Neuman – North Brian Box - South Melissa Gabriel –Maintenance Ext. 3597 Ext. 2518 Ext. 3303 Ext. 2838 www.lcra.org

Go to “Water” then “Quality”, then select “Watershed Management Ordinance”

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