Information on seepage gains and losses is needed by water managers at the Central Utah Water Conservancy District (CUWCD) to determine the total amount of water lost to the subsurface in an approximate 6-mi stretch of the Mapleton Lateral Canal located between the mouth of Spanish Fork Canyon and the city of Mapleton, Utah (fig. 1). The canal is approximately 10 to 15 ft in width and is mostly of earthen construction except for a small section lined with concrete. Flow in the canal generally occurs during May through September, the primary irrigation season. This report describes the methods used to obtain flow measurements made along Mapleton Lateral Canal from May to September to determine the amount of seepage gains and losses and discusses the results of four sets of measurements
