This ongoing conservation service provides assistance to public water utilities in an effort to increase system efficiency and reduce system losses.
It includes the following services:
- Water Audits
- Leak Detection Surveys
- Meter Accuracy Testing
Water audits are periodic, quantitative assessments of water consumption, losses and leakage in public water supply distribution systems. The purpose is to quantify sources of water loss and non-revenue in a distribution system to develop an effective plan for water-loss control. Water audits create a water balance for the distribution system and divide water loss into various causes including: background leakage, meter losses, authorized use and other types of loss.
The District provides water audits as a free service to utilities in our region. District staff help a utility compile annual water use data into a water audit spreadsheet. Staff also provide a written assessment of water losses including potential strategies to reduce loss and recover lost revenue.
Leak detection is the systematic search for leaks within a utility's potable transmission and distribution system.
An effective leak detection program uses specialized equipment to identify leak sounds and to pinpoint the precise locations of underground leaks. Since leaks can develop at any time, detection should be an ongoing program rather than a one-time project.
Leak detection is accomplished in two phases. During the first phase, the entire system is acoustically surveyed on any available contact point such as valves, fire hydrants, service connections and blow-offs. Any points of interest are noted. During the second phase, each point of interest is further investigated with a computerized leak correlator that uses sonic transmission to pinpoint the exact location of the leak. The correlator eliminates the need for extensive hit-or-miss excavation.
Meter Accuracy Testing
Meter accuracy testing is an essential part of any water audit. The results of a water audit are valid only if the figures used, which come from the metering data, are accurate. At a minimum, all source meters should be verified every five years. The AWWA provides testing guidelines in Manual #6; Water Meters: Selection, Installation, Testing, and Maintenance.
Meter accuracy testing is offered for both source well meters (production) as well as service meters (consumption). Meters are tested with a non-intrusive, ultra-sonic, transit-time flowmeter.