This document summarizes water use and conservation efforts in College Station, Texas. It discusses promoting water efficiency and reducing lawn overwatering from 2011 to 2013. Key points include that residential customers use 22,000 gallons daily in the summer on average, 50-55% of residential use is for outdoor watering, and a program targeted 5,500 customers using over 100,000 gallons in the summer months, providing them with individual water budgets based on lot size and landscape area. The program helped reduce the percentage of customers overwatering from 80% in 2010 to 30% in 2013 and cut total overuse by millions of gallons.
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Water Conservation Update
1. RA Kaiser
J Totten
CP Khedun
AC Lewis
J Nations
V Garcia, Jr.
A Landon
LC Sansom
J Andrus
2. COLLEGE STATION WATER USE
Residential Customers: 22,000 customers
Average Summer daily use total: 20 million gal/day
Total Service Area Population: 85,000
Water conservation practices: Block rates, reuse, irrigation
check up, water waste restrictions, rain barrel rebate,
educational information
3. PROMOTING EFFICIENCY/REDUCE LAWN
OVERWATERING: 2011 TO 2013.
50-55% of annual residential use is outdoor watering
City use
• Winter average about 8-9 mgd
• Summer average about 20 mgd
Residential customers
• Winter: 7,500 g/month
• Summer: 20,000+g/m
TARGET AUDIENCE
• Residential customers using over 100,000 gallons (less winter
use) for summer months
About 5,500 customers in 18 neighborhoods/40% of water use
4. COMPUTING WATER BUDGETS
Data Source
• Monthly water use records from College Station Water Utilities
• Irrigation Area: Lot size, less building footprint from Brazos Appraisal District
• Texas ET Network potential evapotranspiration (PET) data
• NWS rainfall data
Estimated monthly indoor water use
• Estimate average winter consumption (AWC)
• AWC = Average of three lowest winter months [November – February]
Summer water consumption (SWC) [April – September] for each
household
• SWC = Monthly Usage − AWC
6. A SAMPLE IRRIGATION AREA
Sample lot
• Parcel Area:
21,780 ft2
• Living Area:
2,377 ft2
• Building Area: 4,083 ft2
• Driveway Area: 2,440 ft2
• Irrigation Area: 15,257 ft2
7. WATER BUDGET FOR SAMPLE LOT
2012 Total Water Use
45,000
40,000
35,000
Gallons
30,000
25,000
20,000
15,000
10,000
5,000
0
April
May
Irrigation
June
Coefficient Method
July
August
GIS Method
September
8. EXAMPLE OF UNDER BUDGET
ACTUAL RESIDENT SUMMER
2012 CONSUMPTION
13. NEXT YEAR
Information on weekly water budgets
• ET network
• Rainfall by sectors of city
• Send weekly watering reports to customers/ TV station announcement
Application of new technology
• Rainfall controller shut off
• Soil moisture controller shut off.