Water Loss Control Action Plan

Because the rolling 3-year average distribution system leakage is greater than 10-percent, a water loss control action plan is needed. Systems with distribution system leakage between 20% and 29% percent must:
  • Assess data accuracy.
  • Assess data collection methods and errors.
  • Implement field activities to reduce leakage within 12 months.
Furthermore, the water loss control action plan must include:
  • Water loss control methods to be implemented
  • An estimate of how long it will take to achieve the distribution system leakage standard.
  • A budget that demonstrates how we will pay for controlling the leakage.
  • Any technical or economic concerns that will prevent us from complying with the standard.
Meters
Inaccurate supply meters are not considered a likely source of the high distribution system leakage. All of the meters are relatively new and the readings are in line with the expected pumping capacity.

Service meter accuracy is considered a possible source of the high distribution system leakage. Some of the meters have been checked and were found to be within acceptable ranges. However, many of the Country Club meters are well over 20-years old and are likely inaccurate and in need of replacement.

Fire Hydrants
Water usage from fire hydrants is considered another source of the high DSL. In more recent years, Yakima County has placed greater emphasis on metering consumption from fire hydrants and now owns 4 hydrant meters to rent out to contractors. Yakima County will continue to emphasize the importance of metering hydrant usage.

Leak Survey
A leak survey was completed in 2008 in the older part of the system that identified 5 minor leaks. Two of the leaks were repaired and the others are being monitored. A leak survey was done on the remainder of the system in 2009 and 2 small leaks were found. One leak is a hydrant that needs to be repaired and the other is a small leak that is also being monitored. A 2-inch flow meter to the Polly Lane apartments was found to be not registering low flows.

Control Methods
Water loss control methods planned include:
  1. Check source meter calibration in 2009. Estimated cost is $5,000.
  2. Begin implementing an automated meter reading system by 2010. Install the meters over a period of 3 years and complete the installation by the end of 2012. Estimated cost is $120,000 in the first year and $140,000 each year thereafter.
The County has established a goal of meeting the distribution system leakage standard of 10-percent beginning in 2013. Additional time will be required if meeting the standard requires replacement of water lines.

There are no known technical concerns that will prevent us from complying with the standard, but economics are a concern. Meeting the distribution system standard will cost an estimated $400,000. If mains need to be replaced, then the cost could increase dramatically. Costs for meeting the distribution leakage standard are included in the Financial Program in Chapter 11.