2018-04-13_HYDROLOGY - M2004044 - Laserfiche WebLink

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Aggregate Industries South Platte Combined SWSP April 13, 2018 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 13 of 20 Left Hand Ditch Company The Applicant seeks to rely on the historic consumptive use for the shares determined in case no. 87CW127. Prior to use of these shares as a replacement source, the Applicant must demonstrate that the shares have continued to be used in approximately the same way as considered in case no. 87CW127 since the decree was entered on June 5, 1991 (that there has been no change in circumstance), or the Applicant must take into account any periods of non-use or undecreed use in determining the actual historic consumptive use of the shares. Leggett-Owens Reservoir Prior to use of these shares as a replacement source, the Applicant must provide a full historic consumptive use analysis for the subject shares. Lupton Bottom Seep Ditches No. 1 and No. 2 Prior to use of these shares as a replacement source, the Applicant must provide a full historic consumptive use analysis for the subject shares. Platte River Power Authority Lease Aggregate has previously utilized leased water from the Platte River Power Authority (“PRPA”) as a replacement source in this SWSP. For this SWSP period, the use of leased water from the PRPA is not necessary and is not proposed to be utilized. In the future, Aggregate may use leased water from the PRPA if a supplemental source of replacement water is needed. Silver Heights Lease Aggregate seeks the flexibility to use water from this source when needed. Applicant must be able to account for and deliver Plum Creek water, including proper accounting and tracking in the Chatfield Reservoir Daily accounting; augmentation station releases, transit loss, etc. Smith & Emmons Ditch Aggregate owns 1.5 of 8 total outstanding shares in the Smith & Emmons Ditch Company. The 1.5 Smith & Emmons Ditch shares were historically used to irrigate 68 acres of pasture grass. Using a Blaney-Criddle analysis the potential crop consumptive use for the 68 acres was determined to be 108.7 acre-feet. Assuming a 10% ditch loss and 55% farm efficiency the dry-year consumptive use was determined to be 91.65 acre-feet for the 1.5 shares. The expected credit for the Smith & Emmons Ditch shares has been estimated from a dry-year farm headgate delivery (using a 10% ditch loss) of 169 acre-feet per share, or 253.5 acre-feet for 1.5 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. The total consumptive use credit in 2016 is projected to equal 178 acre-feet. This amount is greater than the dry-year yield because no augmentation deliveries were made in 2015, resulting in no subsurface return flow obligations for 2016. The applicant anticipates installing a return structure to measure Smith & Emmons Ditch deliveries associated with the subject shares back to the stream prior to the 2016 irrigation season. The applicant may not utilize the 1.5 shares of Smith & Emmons Ditch as a replacement source in this SWSP until such time as all required measurement and bypass structures have been installed and approved by the water commissioner. Dewatering All sites that are actively dewatering have been equipped with a Totalizing Flow Meter (“TFM”) to measure the dewatering discharge. Monthly dewatering volumes must be recorded