Technical Reports Document Library

Note similar report for June 15, 1993-July 2, 1993, a time period included in this report.

On December 7, 1992, the Edwards Underground water District (EUWD) received a completed application form from the city of Leon Valley requesting a leak detection/location survey on its water distribution system. A pre-survey conference was held March 18, 1993 at the City Public Works Center to discuss the work to be performed. It was agreed that EUWD would perform sonic leak detection on all available access points, computerized leak location as needed, record any unusual system conditions found, and submit to the city a revised master water plat with the final report.

Mark L. McGinnis of EUWD began the survey on May 4, 1993, and the survey was concluded on July 2, 1993. Over the course of the survey, EUWD staff surveyed a total of 2,401 access points including 1,715 customer service connections, 184 fire hydrants, 475 main line valves, and 27 other access points covering 32.95 miles of distribution mains. Computer leak sound correlation was performed on four locations.

EUWD technicians detected a total of 76 leaks. This total included 24 meter box leaks, 2 fire hydrant leaks, 28 service line leaks, 1 main leak, 1 valve leak, and 20 customer side leaks. EUWD staff estimates 305,500 gallons of water per day has been saved by the repair of 36 detected leaks as of August 9, 1993. The leaks discovered during the survey range from 300,960 gallons per day to numerous small meter box leaks.

As part of the survey, EUWD staff located 63 main line valves, 12 fire hydrants, and 0.1 miles of distribution main not shown on the master water plats. EUWD staff was unable to locate 14 main line valves and 3 fire hydrants. An additional 25 valve stacks need cleaning and/or repair. EUWD staff noted 3 water meters that were not registering accurately.