C153935 Contract - Laserfiche WebLink

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. .. . different levels of reallocation of space were identified as described"l'l"elow. The top of the existing conservation pool is at elevation 5432 feet MSL. The four target pools are: 5,434 MSL or 2900 acre-feet - At this level, the existing recreational features can be mitigated without relocation of structures; 5,435 MSL or 4,500 acre-feet - At this level, the existing recreational features will require mitigation expenditures to keep the system operational; 5,437 MSL or 7,700 acre-feet - At this level, major expenditures will be required to keep the existing recreational features operational; 5,444 MSL or 20,600 acre-feet - This is a previously determined level that would accommodate an acceptable adjustment in the flood control pool of Chatfield Reservoir. This elevation and volume may have basislstanding in 2001 under the Corps operational standards. The contractor will work with the Corps Contractor and the Recreation Study Contractor to re- evaluate these four target reallocation amounts. Four break point elevations will be re- established that best maximize the space available for water supply storage (this term shall include all uses in this work plan) using guidelines provided by the Corps Contractor (Simons and Associates) and the States "Recreation Impacts" Study Contractor (Foster Wheeler Environmental Corporation) to minimize the costs and impacts to recreation, the environment and flood control. This task includes evaluation of increasing the highest target to more than 20,600 acre-feet of space. b) The Contractor shall be familiar with all the contracts and other documents regarding the operation of Chatfield Reservoir including the 1979 set of contracts between the Corps, the state, and Denver Water. 2. Identifv water riqhts available for storaqe in the reallocated space. The contractor shall inventory and tabulate all the water rights for use of storage space in Chatfield Reservoir: including conditional and absolute decrees, as well as water rights applications that have been filed. Existing or proposed exchange agreements shall also be identified. 3. Identifv potential users of the reallocated space and evaluate their potentials uses. The Contractor shall identify and list entities that have a defined need for the water supply space or a storage decree in Chatfield Reservoir, including the CWCS. The contractor will evaluate each entity's water right decrees or applications or information about existing or potential sources of water and potential storage use patterns, all of this information is to be supplied by the entity. The contractor shall verify information with the Water Court. 4. Acquire available modelinq data. The contractor will acquire and develop an understanding of available model data: (a) South Metro Water Supply Studies' proposed use of Chatfield Reservoir for conjunctive use, (b) Denver Water's current operations under the 1979 agreement (c) Denver Water's interest in reallocated space, (d) Greenway Foundation's request for reallocated space, (e) Central Colorado Water Conservancy District's request for reallocated space, (f) Denver Water's drought draw down operations, and (g) storable inflows for junior water rights using Denver Water's Platte and Colorado Simulation Model (PACSM). Items (b), (c), (d), (f), and (g) will be made available by Denver Water for this project. 5. Develop representative storaqe use patterns for the tarqet amounts of reallocated space The contractor shall develop representative storage use patterns comprised of inflow, storage, and outflow on a daily time step that are in conformance with the Corps' model being used for the study.