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4. Hydrology and Hydraulics <br /> 4.1 Inflow Hydrology <br /> The Overland Ponds and Treiber Pits are off-channel, below grade storage reservoirs. The <br /> reservoirs are disconnected from the overland hydrology and the only surface water inflow is <br /> from precipitation or pumped water. The Tri-Districts have ditch shares in the New Mercer <br /> Ditch Company and have rights to convey up to 10 cfs from the New Mercer Ditch into <br /> Overland Ponds Pond 1. <br /> The Tri-Districts have the water rights for 93 cfs, which is conveyed via the Pleasant Valley <br /> Pipeline. However, there is currently not a pipeline which connects the Pleasant Valley <br /> Pipeline and the Overland Ponds-and Treiber Pits. The Tri-Districts intend to construct a <br /> future branch line from the Pleasant Valley Pipeline to the project site. <br /> The Cache la Poudre River flows to the north of the Treiber A and Treiber B ponds and is <br /> hydraulically connected to the river and the groundwater system. As part of a system-wide <br /> reclamation plan, the Tri-Districts have constructed a slurry wall around Treiber A. Future <br /> cutoff-walls or slope liners are planned to hydraulically disconnect Treiber B from the river <br /> and groundwater. Future reclamation activities within Currie A, and Currie B are unknown <br /> at this time. <br /> 4.2 Interconnect Configuration <br /> Each interconnect consists of an upstream gated intake structure, interconnect pipeline, and a <br /> downstream impact basin with riprap lining. The components of the design are described <br /> further below. <br /> Calculations for the capacity of the interconnects at maximum discharge and normal water <br /> surface conditions are shown in Appendix D. <br /> A summary of selected design data for the interconnects is presented in Table 3. <br /> G E I Hydrology and Hydraulics I f0 <br />