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<br />) <br /> <br />those subdivisions of which separate presentation is not warranted or <br /> <br />desired. <br /> <br />Reach lengths are shortest where the physical, economic, and <br /> <br />political factors are heterogenous, Areas with steep slopes and rapidly <br /> <br />changing cross section geometry may have reach intervals every 1,000 ft, <br /> <br />Reach segments along a major river may be over two miles long, <br /> <br />STEP THREE: ESTABLISH ELEVATION-FREQUENCY REIATIONSHIPS <br /> <br />-> <br /> <br />Step Three is a series of three elements involving the primary <br /> <br /> <br />portion of the hydrologic and hydraulic studies required in establishing <br /> <br /> <br />the existing conditions, Step Three includes development of the stage- <br /> <br /> <br />discharge curve, which is the basic hydraulic relationship; and the <br />frequency-discharge curve, which is the basic hydrologic relationship. <br />The elevation-frequency (or stage-frequency) relationship is the function <br /> <br />derived by combining these two basic relationships, <br /> <br />Stage-Discharge Relationships <br />Definition, Stage-discharge relationships are functions that relate <br /> <br />the amount of stream discharge (Q) to water surface elevations. Elevation <br /> <br />is measured by the level of water above mean sea level (m,s,l.) or an <br /> <br />established water surface level, Discharge is measured in number of cubic <br /> <br />feet of water passing a gauging station in one second, Stage-discharge <br /> <br />relationships are also known as rating curves, An example of a rating <br /> <br />curve is shown in Figure V-3, <br /> <br />) <br /> <br />V-9 <br />