2012-03-14_HYDROLOGY - M2004051 - Laserfiche WebLink

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Jared Dains South Platte Combined Replacement Plan March 14, 2012 Page 11 alfalfa. Using a Blaney - Criddle analysis the potential crop consumptive use for the 72.1 acres was determined to be 130.75 acre -feet. Assuming a 30% ditch loss and 55% farm efficiency the dry year consumptive use for the 0.371 Brighton ditch shares was determined to be 46.5 acre -feet. Aggregate will utilize the entire 1.038 shares for use in this plan. The expected credit for the Brighton Ditch shares has been estimated from a dry -year farm headgate delivery (using a 30% ditch loss) of 283 acre -feet per share, or 293 acre -feet for all 1.038 shares. Return flows consist of surface return flows, which are based on current deliveries, and subsurface return flows which are based on the previous year's total deliveries. In 2011, Aggregate delivered only 172 acre -feet of the Brighton Ditch shares because the full yield of the water right was not needed to meet the replacement obligations. The total consumptive use credit in 2012 is projected to equal 156 acre - feet, which is greater than the dry -year yield because of the reduced subsurface return flow obligation requirement resulting from low deliveries in 2011. Old Brantner Ditch Aggregate currently has use of 11 shares of Old Brantner Ditch, however they do not propose to utilize those shares in this plan. Bergen Reservoirs 4, 5, & 6 Aggregate acquired shares (estimated to be 191 shares out of the 403.5 total shares) in the Bergen Reservoir from its predecessor, Cooley Gravel Company, however they do not propose to utilize those shares in this plan. Last Chance Ditch Company No. 2 Aggregate acquired 0.3154 shares (certificate nos. 248 & 251) in the Last Chance Ditch Company No. 2 from its predecessor, Cooley Gravel Company, however they do not propose to utilize those shares in this plan. Lupton Bottom Seep Ditches No. 1 and No. 2 Aggregate acquired 100% ownership of the Lupton Bottom Seep Ditches No. 1 and No. 2 from the Lupton Bottom Ditch Company, however they do not propose to utilize this source in this plan. Huett Seepage Ditch Aggregate acquired 100% ownership of the Huett Seepage Ditch from its predecessor, CAMAS Colorado, however they do not propose to utilize this source in this plan. Dewatering Credit The applicant will account for the depletions and accretions to the river that resulted from dewatering operations and will include this information on their monthly accounting. Prior to claiming any credit for the water returned to the stream system from dewatering in excess of lagged dewatering depletions (a net accretion), the applicant must install a totalizing flow meter that accurately measures the quantity of water being pumped and returned to the stream system via dewatering operations. No net accretion credits will be given to any dewatering operation whose volume is based on the assumed dewatering flow rate after March 30, 2012. This SWSP will not be renewed until all dewatering activities have a totalizing flow meter installed, regardless if the result is a net accretion or net depletion. Long Term Depletions and Reclamation In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division of Reclamation, Mining, and Safety ( "DRMS "), all sand and gravel mining operators must