Technical Reports Document Library

Note similar report for May 4, 1993-August 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.

At this time, Mr. James J. Malone, Director of Public Works for the City of Leon Valley, requested the District also perform a survey on the San Antonio Water System distribution system within the city limits of the City of Leon Valley. Approval for this survey was requested of and granted by Mr. Joe Aceves, President and Chief Executive Officer of San Antonio Water System. An additional pre-survey conference was held May 18, 1993 at the San Antonio Water system Northwest Service Center. 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 San Antonio Water System a revised master water plat with the final report .

Mark L. McGinnis of EUWD began the survey on June 15, 1993, and the survey was concluded on July 2, 1993. Over the course of the survey, EUWD staff surveyed a total of 1,275 access points including 914 customer service connections, 81 fire hydrants, 255 main line valves, and 25 other access points covering 15.29 miles of distribution mains. Computer leak sound correlation was performed on one location.

EUWD technicians detected a total of 26 leaks. This total included 2 meter box leaks, 2 fire hydrant leaks, 6 service line leaks, 1 valve leak , and 15 customer side leaks. EUWD staff estimates 20,684 gallons of water per day have been saved by the repair of 26 detected leaks as of August 9, 1993. The leaks discovered during the survey range from 14,400 gallons per day to small meter box leaks.

EUWD staff was unable to locate 18 valves and 21 customer service connections. An additional 8 valve stacks need cleaning and/or repair. EUWD staff noted 1 water meter that was not registering accurately.