Technical Reports Document Library

On August 25, 1993, the Edwards Underground Water District (EUWD) received a request from the City of Kirby to perform a leak detection I location survey on its water distribution system. A pre-survey conference was held April 20, 1995. at the City of Kirby Public Works Center to discuss the work to be performed. It was agreed that EUWD staff would perform sonic leak detection on all available access points and computerized leak location as needed. A final report, including any unusual system condition found and an updated master water plat would be submitted to the City at the conclusion of the survey.

John E Gapinski of EUWD began the survey on May I, 1995. With the approval of Mr. Sidney Lankford, Sr., Public Works Director for the City of Kirby the survey was halted and restarted on three occasions. The survey was performed May 1, 1995 – May 16, 1995. June 6, 1995 – June 30, 1995, and October 25, 1995 -December 12, 1995. Over the course of the survey, EUWD staff surveyed a total of 3,080 access points including 2.64 7 customer service connections, 122 fire hydrants, 292 main valves, and 19 other access points covering 28.18 miles of distribution main. Computer leak sound correlation was performed at one location by EUWD staff.

EUWD staff detected 104 utility side leaks and 39 customer side leaks for a total of 144 leaks. The utility side leaks included 68 service leaks, 31 meter box leaks, 1 main valve leak, 1 main leak and 3 fire hydrant leaks. EUWD staff estimates 30,661 gallons of water per day has been saved by the repair of 54 utility side leaks as of February 14, 1996. The leaks discovered during the survey range from 5,328 gallons per day to numerous small meter box leaks.

As part of the survey, EUWD staff located 57 valves of various types. 15 fire hydrants and 3,250 feet of main not shown on the master water plats. EUWD staff were unable to locate 52 valves of various types and 6 fire hydrants shown on the master water plats. An additional 22 items were discovered to need some type of repair, cleaning, or adjustment.