2019-08-27_HYDROLOGY - M1989120 - Laserfiche WebLink

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Amended Aggregate Industries South Platte Combined SWSP August 27, 2019 Plan I Ds 3614, 47731 3624, 47721 4616, 3437, 3376, 3650, 3668, and 5475 Page 14 of 21 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 Et Emmons Ditch Aggregate owns 1.5 of 8 total outstanding shares in the Smith Et Emmons Ditch Company. The 1.5 Smith Et 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 Applicant will install a return structure to measure Smith &t Emmons Ditch deliveries associated with the subject shares back to the stream prior to claiming use of this source. The applicant may not utilize the 1.5 shares of Smith Et 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. Dewateri ng 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 monthly with the meter readings included on submitted accounting. As long as dewatering operations remain continual at constant rates the net accretions are assumed to offset any lagged depletions. Under this assumption, the Applicant is not claiming any dewatering credit. Once dewatering operations stop, or are significantly reduced, at specific sites the monthly meter readings will be used to analyze post pumping depletions. The sites that will be actively dewatered during this SWSP period are the Wattenberg Pit, W.W. Farms Pit, and the Tull Pit.