1. LCRA Highland Lakes Watershed Ordinance
Performance Standards Overview

2. 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
Construction-generated sediment changes the character of runoff from natural conditions– existing soils are pulverized by mechanical action of rock saws, hydraulic rams, construction traffic. Top soils and subgrade materials may be imported or moved within the site; Top soils are removed, often leaving poor mineral soils on the surface. The landscape and hydrology is changed by the addition of pollutants including fertilizers, pesticides, oil/grease, metals. Impervious surfaces gather these pollutants between rainfall events and discharge them to waterways during rainfall. Quarry and Mine Activities often have similar characteristics.

3. HLWO Jurisdictional Area
Travis County (Lake Travis Watershed)
Llano County (portion)
Burnet County (Colorado River Watershed)
Total Area ,172 sq. mi.

4. 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

5. 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 specifications
Control
Water Quality Education Contact LCRA to initiate education program

6. 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

7. 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

8. Marble Falls – Edwards Offices
Stand-alone bioretention basin
Vegetated filter strip for driveway

9. Marble Falls – RSC Equipment – ED pond with secondary bioretention

10. Questions ?? Contacts LCRA Watershed Engineering & Planning
Ext. 2324
Supervisor: Erik Harris, P.E. Ext. 2091
Permit Review:
Adam Boatright, P.E. Ext. 4080
Dean Thomas, P.E. Ext. 2892
Inspections:
Supervisor: David Williams Ext. 3597
Mark Neuman – North Ext. 2518
Brian Box - South Ext. 3303
Melissa Gabriel –Maintenance Ext. 2838
Go to “Water” then “Quality”, then select “Watershed Management Ordinance”