10 Opflow January 2020 www.awwa.org/opflow Leak Detection https://doi.org/10.1002/opfl.1306 Jessica Green is a maintenance planner at New Braunfels Utilities ( www.nbutexas.com ), New Braunfels, Texas. Paul Gagliardo is an independent consultant working with Utilis ( www.utiliscorp.com ), San Diego. PHOTOGRAPHS: UTILIS N EW BRAUNFELS, TEXAS, is located in the greater San Antonio area. When the city’s water utility, New Braunfels Utilities (NBU), decided to cut its nonrevenue water (NRW) losses in 2014, it embarked on a five-year zone-leak monitoring program using various technologies to conduct a full-system, traditional boots-on-the-ground zone monitoring survey between 2014 and 2018. In 2018, NBU served a population of 84,200 through 39,060 service connections. An average of 13.3 mgd was supplied to the system, with a net sales volume of 10.9 mgd. This equated to an NRW volume of 2.4 mgd, or 18 percent. As detailed in AWWA’s Manual of Water Supply Practices M36, Water Audits and Loss Control Programs ( www. awwa.org/M36 ), NRW is defined as the total of real losses, or system leakage; apparent losses, such as meter inaccuracies and unauthorized con-sumption; and unbilled authorized consumption, such as system flushing and firefighting flows. Total NRW loss is modest, but the cost of produc-ing water is high. Thus, reducing real water losses significantly helps the utility’s bottom line. In 2019, NBU tested a new program using satel-lite radar remote survey technology to pre-locate likely leaks to determine the technical efficacy and value of this option. To monitor its entire network on an ongoing basis, NBU contracted with Utilis, a San Diego–based company that uses synthetic aperture radar satellite data and a proprietary algorithm to specifically identify areas with soil moisture at a depth underground that often signi-fies drinking water leaks from pipes. This informa-tion was provided to the utility to complement its existing leak detection and repair program. Through its approach to reducing real water losses, a small Texas utility demonstrates how it uses technology, innovation, and smart planning to benefit itself and its customers. BY JESSICA GREEN AND PAUL GAGLIARDO SATELLITE DATA COMPLEMENT TRADITIONAL LEAK DETECTION AND REPAIR PROGRAMS 2020 © American Water Works Association 

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