Heavily Irrigated and Chemically-Treated Turf Inappropriate and - PowerPoint PPT Presentation

Inappropriate and Poorly-Regulated Land Use Heavily Irrigated and Chemically-Treated Turf

Inappropriate and Poorly-Regulated Land Use Sewage Effluent Irrigation

Sprawling Development

Effects of Development on Our Water: Decreased Base Flow in Streams Decreases Aquifer Recharge

Effects of Development on Our Water: Decreased Base Flow in Streams Decreases Aquifer Recharge 90% 80% Storm flow: direct Pct. Total Annual Precipitation flood runoff from 70% Stormflow rainfall 60% Converted 50% 40% Base Flow: clear, clean creek flow between storm 30% Baseflow events 20% 10% 0% 0% 5% 10% 15%20% 25%30% 35%40% 45% 50%55% 60%65% 70%75% 80%85% 90% Impervious Cover

Stream Bank Erosion

Stream Bank Erosion 12 11 10 Alluvial Channel 9 Rock-Bottomed Channel 8 Rock-Controlled Channel Enlargement Ratio 7 6 5 4 3 2 1 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Impervious Cover Source: Raymond Chan & Associates, Technical Procedures for the Watershed Erosion Assessments, September, 1997.

Sewage Spills

Effects of Development on Our Water: Storm Runoff Pollution the Edwards Aquifer Example: Curve indicates that Chemical Oxygen Demand loads at 35% IC will be 15 times higher than background loads .

Engineered Controls Fail

Engineered Controls Fail Filtration Control Basin

Engineered Controls Fail SAMS CLUB – Sedimentation Filtration

Engineered Controls Fail SAMS CLUB – Sedimentation Filtration

Engineered Controls Fail SAMS CLUB – Sedimentation Filtration

Engineered Controls Fail SAMS CLUB – Sedimentation Filtration

Engineered Controls Fail SAMS CLUB – Sedimentation Filtration

Limited Geographical Jurisdiction SM ETJ SA ETJ SA Limits NB ETJ

Limits on Development