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 Minimum Requirements

• Pre-development Planning Meeting with LCRA staff to review project

• Water Quality Management Plan showing drainage layout and BMP design information

• Buffer Zones Plan showing buffer zones for creeks, and buffer zone protection measures

• Construction- Phase Construction-phase erosion control plan with Erosion and Sediment details and specificationsControl

• Water Quality Education 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 & Planning512-473-3200 Ext. 2324

Supervisor: Erik Harris, P.E. Ext. 2091

Permit Review: Adam Boatright, P.E. Ext. 4080Dean Thomas, P.E. Ext. 2892

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

www.lcra.org Go to “Water” then “Quality”, then select “Watershed Management Ordinance”