2012-09-20_HYDROLOGY - M1987049 - Laserfiche WebLink

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Depth to Ground Water (Feet) Percent Reduction in CU Credit' Native Grass Alfalfa 1 85% 100% 2 50% 90% 3 30% 75% 4 20% 50% 5 15% 35% 6 10% 20% 7 5% 15% 8 0% 10% Jeffrey Clark RMCC Combined SWSP - AMENDMENT June 7, 2012 Page5of7 11 The Applicant shall perform an inspection and provide verification for all parcels of dried up land used to generate augmentation credits during the term of this SWSP. The final verification of dry up will be in the form of an affidavit signed by an individual having personal knowledge of the dry up for the entire irrigation season for each parcel of land used in this SWSP. In accordance with the attached protocol for dry -up of irrigated land, the Applicant shall provide a written notification to the water commissioner and division engineer by April 1, 2013 identifying the lands to be dried up for the 2013 irrigation season. By October 31, 2012 the Applicant shall provide an affidavit to the water commissioner and division engineer that identifies and confirms the lands that were dried up during the 2012 irrigation season in order that the final determination of augmentation credits for the irrigation season can be made along with mapping showing any revisions to the dried -up acreage. The Applicant shall modify accounting to reflect that the credit from any dried up fields containing alfalfa or native grass was assessed in the following manner: (a) For fields deep tilled or chemically treated to successfully kill alfalfa or native grass, 100% credit will be given for consumptive use as otherwise computed under the conditions of this approval. (b) For fields not deep tilled or chemically treated to successfully kill alfalfa or native grass, records of monthly monitoring of depth to ground water at existing irrigation wells or existing or new monitoring wells or piezometers within % -mile of each alfalfa or native grass field must be maintained. Credits will be reduced according to the following table when depth to ground water is less than the depth assumed to provide no significant contribution to native grass or alfalfa growth. Measurements taken at the start of each month will determine the necessary reduction in credit to be applied during the following month. The applicant may use another methodology upon review and approval by the State Engineer and Division Engineer. 1. Adapted from EVAPOTRANSPIRATION AND AGRONOMIC RESPONSES IN FORMERLY IRRIGATED MOUNTAIN MEADOWS, South Park, Colorado, March 1, 1990; Revised September 1, 1991 12. The approval of this substitute water supply plan does not relieve the Applicant and /or landowner of the requirement to obtain a Water Court decree approving a permanent plan for augmentation or mitigation to ensure the permanent replacement of all depletions, including long -term evaporation losses and lagged depletions after gravel mining operations have ceased. If reclamation of the mine site will produce a permanent water surface exposing groundwater to evaporation, an application for a plan for