5 Colo. Code Regs. § 1002-42.5
Current through Register Vol. 47, No. 20, October 25, 2024
Section 5 CCR 1002-42.5 - DEFINITIONSThe following definitions are applicable to these regulations:
(1) "Alluvium" is clay, silt, sand or gravel, or similar unconsolidated detrital material deposited during comparatively recent geologic time by a stream or other body of running water as a sorted or semisorted sediment in the bed of the stream or on its flood plain or delta, or as a cone or fan at the base of a mountain slope.(2) "Confined Groundwater" is groundwater under greater than atmospheric pressure beneath or between layers of relatively impermeable material; the static water level rises above the bottom of the confining layer.(3) "River Alluvium and Terrace Gravel System" are aquifers located within those alluvium formations mapped on the "Geologic Map of Colorado" (Ogden Tweto, 1979) as "Qa-Modern Alluvium." (includes Piney Creek Alluvium and younger deposits) and "Qg-Pinedale and Bull Lake Age Gravels and Alluvium." (includes Broadway and Louviers Alluvium).(4) "Saturated Zone" is a subsurface zone in which all of the interstices are filled with water under pressure greater than that of the atmosphere. This zone is separated from the zone of aeration by the water table.(5) "State" is defined in the Constitution of the State of Colorado, article 1 as commencing on the thirty-seventh parallel of north latitude, where the twenty-fifth meridian of longitude west from Washington crosses the same; thence north, on said meridian to the forty-first parallel of north latitude; thence along said parallel, west, to the thirty-second meridian of longitude west from Washington; thence south, on said meridian, to the thirty-seventh parallel of north latitude; thence along said thirty-seventh parallel of north latitude to the place of beginning.(6) "Unconfined Groundwater" is groundwater that has a free water table; i.e., water not confined under pressure beneath relatively impermeable rocks.(7) "Upper Hydro-Stratigraphic Unit" is the uppermost layer of groundwater incorporating any aquifer or other zone of groundwater occurrence which is the first encountered beneath the ground surface and includes all saturated geologic formations, unconsolidated alluvium and colluvium, and hydraulically connected zones in bedrock.37 CR 13, July 10, 2014, effective 7/31/201440 CR 03, February 10, 2017, effective 3/2/201740 CR 23, December 10, 2017, effective 12/31/201741 CR 11, June 10, 2018, effective 6/30/201843 CR 11, June 10, 2020, effective 6/30/2020