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<br />. <br /> <br />Reservoir Routings <br />A study of the relationship between flood inflow to a reservoir <br />and the resulting controlled and uncontrolled outflow from the reser- <br />voir. If there is insufficient storage volume and controlled releases <br />cannot be made fast enough through an outlet works and/or the emergency <br />spillway, the dam embankment or structure will be overtopped. <br /> <br />Runoff <br />The quantity of rainfall which flows over the surface to enter the <br />stream as discharge volume. The difference in quantity between rain- <br />fall and runoff represents losses to infiltration, detention storage, <br />and evapo-transpiration. <br /> <br />S <br /> <br />This represents the standard deviation of the logarithm of the <br />flows, which is the second moment in the statistical analysis of a flow <br />record. It is a statistical measure of the range of variation of flows <br />around the mean flood. <br /> <br />SCS Curve No. <br />The curve number represents a specific rainfall-runoff relation- <br />ship which is based on the cover-complex in the basin being studied. <br /> <br />Skew <br /> <br />Skew is the third moment in a statistical analysis of a flow <br />record. It is a statistical measure of the deviation of the distribu- <br />tion away from the normal "bell shaped" curve. <br /> <br />Snyder's Constants <br />These constants are used in empirical relationships to develop a <br />unit hydrograph for a drainage basin. The constants affect the magni- <br />tude of the peak and the peaking time of the unit hydrograph. <br /> <br />Standard Deviation <br />(See "S") <br /> <br />Stream Gage <br />A device to indicate the water depth of a stream at the gage site. <br />The discharge at this location can be determined by using the stage or <br />water level measured by the gage and comparing it to a stage-discharge <br />relationship which has been established for that stream at the stream <br />gage location. <br /> <br />SWMM <br /> <br />Environmental Protection Agency's Storm <br />one of several computer programs that can be <br />model. <br /> <br />Water Management Model-- <br />used as a hydrologic <br /> <br />. <br /> <br />A-5 <br />