Brigit Afshar University of Texas at Austin Statistics in Water Resources May 2009.

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Presentation transcript:

Brigit Afshar University of Texas at Austin Statistics in Water Resources May 2009

Conventional Rainwater Harvesting System Roof Catchment Storage Tank Gutter First-Flush Diverter 10 gal./1000 sq. ft. (TWDB) Downspout Overflow Spout Adapted from: Texas Commission on Environmental Quality (TCEQ) “Harvesting, Storing, and Treating Rainwater for Domestic Indoor Use.”

Feasibility  National Atmospheric Deposition Program (NADP) VS.

Domestic Indoor Water Demand Number of people per household3 Water Consumption of FixtureAssumptions Household Monthly (30-day) Demand Toilets Ultra Low Flow Toilets (post- 1993)1.6gal/flush6flushes/person/day864 Dual Flush1gal/flush liquids flushes/person/day0 1.6gal/flush solids flushes/person/day0 Baths and Showers Showerhead2.2gal/min5minutes/person/day990 Baths50gal/bath baths/day0 Faucets2.2gal/faucet/min5minutes/person/day990 Appliances (per-use, not per- person) Clothes washer (Front-loading, gal)20gal/load2.6loads/week208 Dishwasher8gal/cycle0.7cycles/day168 TOTAL 3220 Source: TWDB; AWWA,1999

Assumptions Monthly Annual Indoor water demand (gallons)3220 Irrigation (gallons, Mar-Oct)150 Collection surface (sq. ft.)2500 Starting volume (gallons)3000 Collection rate (gal/in. rain/sq.ft)0.62 Collection efficiency0.85 Indoor water demand (gallons)38640 Irrigation (gallons, Mar-Oct)1200 Collection surface (sq. ft.)2500 Starting volume (gallons)10000 Collection rate (gal/in. rain/sq.ft)0.62 Collection efficiency0.85

Climate Regions of Texas Source: NADP, 2009Source: Texas Center for Policy Studies, 1995

Upper Rio Grande and Far West Month Irrigation Demand Total Demand (gallons) Average rainfall (inches) Rainfall collected (gallons) End-of-month storage (gal) January February March April May June July August September October November December Total:

Northeast West Central

Annual Analysis

Texas Harvesting Potential RegionNeeds Met Water Saved (gallons/year) Far WestPartial High PlainsPartial Lower GulfYes North TexasYes NortheastYes South CentralYes Upper GulfYes West CentralYes 31381

United States Hydrologic Regions Source: NADP, 2009

United States Harvesting Potential RegionNeeds Met Water Saved (gallons/yr) 13 Rio GrandePartial Upper COPartial Lower COPartial Great BasinPartial15955 AlaskaPartial22725

Questions?