Laserfiche WebLink
HYDROLOGY <br /> There are several key elevations that relate to the hydrology of the new pumping <br /> system. These elevations are listed here for reference. The elevations listed should be <br /> considered approximate and should be confirmed by a field survey. <br /> Robinson Reservoir Dam Crest Elevation: 10,894 feet <br /> Top of the Reservoir Spillway Gate: 10,890 feet <br /> Reservoir Spillway Concrete Floor: 10,887 feet <br /> Robinson Reservoir Dam is classified by the State as an existing large class 1 <br /> structure. According to the rules and regulations of the Dam Safety Branch of the State <br /> Engineer's Office, the inflow design flood for Robinson Reservoir is 75 percent of the <br /> Probable Maximum Flood. The reservoir must be capable of routing this flood with a <br /> minimum of one foot of freeboard. Robinson Reservoir can safely pass the design flood <br /> with a maximum water surface elevation of 10892.85 feet (1.15 feet of freeboard). This <br /> elevation was considered to be the absolute maximum water level in Robinson Reservoir <br /> for the preliminary design of the new pump station. <br /> Our analysis indicates that the proposed seepwater pond will be capable of <br /> containing in excess of 50 percent of the Probable Maximum Flood tributary to the pond. <br /> This is assuming that the crest of the new containment dike is at elevation 10892 feet. <br /> It is likely that this magnitude of flood protection greatly exceeds the requirements of the <br /> Emergency Preparedness Plan for the Climax Mine site. It is unlikely that the new <br /> containment dike would independently be a jurisdictional structure because it will be <br /> contained entirely within the existing reservoir, and the existence of the new dike will not <br /> have an adverse effect on the integrity or the flood discharge capability of the existing <br /> dam. <br /> The pattern of expected normal inflow to the reservoir and seepwater pond had to <br /> be estimated to determine the required pumping capacity of the new system. The total <br /> inflow to Robinson Reservoir originates from several sources. These sources include No. 1 <br /> 4 <br />