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• With the passage of Senate Bill 200 (1987) legislative session), a <br />portion of certain fees collected by the State Engineer is credited to ground <br />water management cash fund (C.R.S. Section 1, 37-80-111.5). Part of the cash <br />fund is to be expended in establishing and maintaining a ground water data <br />network and provide appropriate data to the public as expeditiously as <br />! possible. The Denver basin network and water level report is part of the <br />overall goals established by Senate Bill 200. <br />Purpose <br />The purpose of this report is to provide measurements of depth to the <br />spring 1990 ground water level, and depths to ground water level for up to <br />four measurements taken prior to 1990, and list the change between the 1988 <br />and 1989 and 1989-1990 water levels. All measurements are in feet below land <br />surface datum. The measurements were made either with a steel tape, an <br />electric sounder, or by airline methods. Some data has been furnished by <br />local water -supply and distribution companies which maintain either daily or <br />monthly water level records. A short summary of observations of the four <br />• aquifers follows. <br />Dawson Aquifer - Of the 42 wells which were measured all but 10 experienced a <br />water level decline since spring 1989. The declines range from 0.1 foot to <br />90.0 feet with most of the higher declines occurring in the Parker and Castle <br />Rock areas. South of Castle Rock the 1989-1990 decline ranges from 0.1 foot <br />! to about 7 feet. Water level rises range from about 1 foot to about 6 feet <br />and are attributed to periods of inactivity before the wells were measured. <br />Denver Aquifer - Of the 42 wells measured all but 10 experienced a water level <br />decline since spring 1989. The declines ranged from about 1 foot to about 270 <br />feet. The latter is from a well in a municipal well field and probably <br />! represents a level taken shortly after the well had been pumped. Most of the <br />domestic well declines are less than 5 feet since spring 1989. <br />Arapahoe Aquifer - Of the 93 wells measured only 24 wells experienced a water <br />level decline and 17 of these are public supply wells. The declines range <br />from about 2 feet to 525 feet; the latter being the water level in a recently <br />! pumped municipal well. the average water level decline in the domestic wells <br />measured is about 4 feet since spring 1989. Approximately one half of the <br />wells which experienced a water level rise are domestic wells and one half are <br />municipal wells. The average rise of the water level in the domestic wells <br />measured is 5 feet. the average rise in water level of the municipal well <br />measured is about 80 feet. <br />Laramie -Fox Hills Aquifer - Approximately 30 percent of the Laramie -Fox Hills <br />wells monitored are domestic, the remainder are used for municipal, <br />semi -municipal or irrigation purposes. Of the 56 wells measured nearly half <br />experienced a water level decline and nearly half experienced a water level <br />rise. Approximately 50 percent of the wells which exhibited a water level <br />! decline are municipal wells and most of these are located in the northern one <br />half of the Denver Basin. Most of the measured water level declines are <br />occurring in wells located north of Township 6 south. Of the 20 wells which <br />experienced a water level rise, 14 are municipal. If is possible that a short <br />term reduction in LF -aquifer water withdrawals is responsible for the apparent <br />rises. <br />-2- <br />! <br />