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Conveyance Efficiency: <br />Church Ditch conveyance losses are approximately 25 percent. <br />Irrigated Acreage and Crop Types: <br />There are approximately 474 irrigated acres of grass <br />pasture under the Church Ditch that are out side of municipal boundaries, based on the <br />SPDSS irrigated acreage assessment. Irrigated acreage identified unde r the Church Ditch <br />was at a maximum of 694 acres in th e assessment of 1956 aerial photography. This <br />acreage does not include some m unicipal parks, open space, and other areas that may be <br />supplied by the Church Ditch since the SPDSS irrigated acreage assessment focused on <br />agricultural irrigation and analyzed only irrigated areas outside of municipal boundaries <br />in the SPDSS study area. <br />Ground Water Use: <br /> There is no significant ground wa ter use under the Church Ditch. <br />Return Flow Locations: <br />Return flows from irrigation of la nds along the Church Ditch en route <br />to Standley Lake and seepage losses from operation of the inlet canal occur to Clear <br />Creek and to Van Bibber, Ralston, and Leyde n Creeks which are all tributary to Clear <br />Creek. <br />Measurement Device: <br />Church Ditch headgate diversions fr om Clear Creek are measured with a <br />12-foot Parshall Flume equipped with a clock recorder. Diversions from Church Ditch <br />into Standley Lake occur at three headgates that are measured separately, including two <br />3-foot Parshall flumes and one 2-foot Parsha ll flume. All the diversions enter the west <br />side of the reservoir. <br />HydroBase Data: <br />Daily data for Church Ditch are av ailable in HydroB ase (Version 20060808) <br />Figure 2 <br />starting in 1952, as summarized on a monthly basis in . Average annual total <br />diversions were approximately 11,100 ac-ft fo r the 1952 to present period. Diversions <br />have reduced through the Church Ditch over th e last 20 or so year s due to numerous <br />changes of Church Ditch shares (inches), which typically allo w the Standley Lake Cities <br />to divert their Church Ditch water and other Clear Creek supplies through various <br />locations, including the Croke Canal that delivers water to Standley Lake. <br />Missing data from 1950 to 1951 were not available from the Cities of Northglenn and <br />Westminster or FRICO. Records of various di version and release classes are available in <br />HydroBase for portions of the 1952 to present period. <br />5 of 24 <br />