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

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0% 5% 10% 15%20% 25%30% 35%40% 45% 50%55% 60%65% 70%75% 80%85% 90% Impervious Cover

• Pct. Total Annual Precipitation

Converted Baseflow Stormflow Storm flow: direct flood runoff from rainfall Base Flow: clear, clean creek flow between storm events

Stream Bank Erosion

Stream Bank Erosion

Source: Raymond Chan & Associates, Technical Procedures for the Watershed Erosion Assessments, September, 1997.

1 2 3 4 5 6 7 8 9 10 11 12 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Impervious Cover Enlargement Ratio Alluvial Channel Rock-Bottomed Channel Rock-Controlled Channel

Sewage Spills

Effects of Development on Our Water:

Storm Runoff Pollution

Example: Curve indicates that Chemical Oxygen Demand loads at 35% IC will be 15 times higher than background loads.

the Edwards Aquifer

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

SA ETJ SA Limits NB ETJ SM ETJ

Limits on Development