SPDSS_Task7-2_WellUseWellAugmentationPlans

A number of possible explanations exist for the variation in number of wells tied to acreage from the list of wells in HydroBase, including: • Wells may be mis-located in the GIS coverage and therefore not assigned to irrigated parcel(s). • Wells are not active. • Wells not decreed or decreed for less than 50 gallons per minute. • Wells are decreed for other uses (e.g., augmentation, recharge, domestic, municipal, commercial, stock water, etc.). • The association of a well to the augmentation plan ID may be incorrect in HydroBase. System Overview The augmentation plans under the Riverside Canal are used to divert its junior direct flow and storage recharge rights, in priority, into various recharge sites under the canal system when water is available in the South Platte River. The canal company prefers to run recharge water when there is no irrigation water carried through the system because they receive recharge credit for the ditch loss at those times. Per the various decrees, lagged accretions to the South Platte River from diversions to recharge are accounted via the Stream Depletion Factor (SDF) method. None of the wells were historically metered or have calibrated electric coefficients; therefore, no actual pump records are available. Administration of out-of-priority lagged well depletions is requested in the 02CW86 application with priority dates specific to the member wells' water rights. Recommendations Recommendations for representing the various augmentation plans under the Riverside Canal in the initial development of the SPDSS StateMod Water Resources Planning Model input files are presented below based on review of the decrees and interviews with canal company personnel and Division 1 personnel. Augmentation Plan Demands To represent pumping for the entire SPDSS study period (1950 to present), well pumping to supply irrigated lands should be estimated by the consumptive use algorithm in StateCU and StateMod, to meet the irrigation water requirement less simulated surface water deliveries (if applicable). Lagged well depletions affect river flows based on timing and location factors defined in StateMod input files. Lagged depletions and the supplies used to meet those obligations should be accounted in one Riverside Canal Well Depletions Plan structure (ID 0102522) below the canal corresponding with administration of the augmentation plan. Augmentation Plan Supplies Various sources are typically available to supply water to replace lagged well depletions. The sources and the structures related to the Riverside Canal augmentation plan system recommended for inclusion in the SPDSS model are summarized in Table 2. Augmentation supplies are as follows: • Recharge rights from the river for the Riverside Canal augmentation plan system are summarized in Table 3. A-64 ofA-106