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<br />2. ELEVATION-STORAGE RELATIONSHIP. <br /> <br />Several methods have been developed for determining the elevation <br />storage relationship for a reservoir. These methods involve the ,use of topographic <br />mapping or surveys and apply geometric techniques to determine the volume for each <br />elevation. <br /> <br />2.1 CONIC METHOD. <br /> <br />The conic method involves digitizing surface areas at each elevation <br />contour shown on topographic mapping. Geometric shape of the reservoir between <br />contours is assumed to be similar to a truncated cone. Therefore, incremental <br />volumes can be computed from the conic equation as shown in Figure 1. Volume of <br />a cone is computed as : <br /> <br />V = VaAh <br /> <br />(3) <br /> <br />where: <br /> <br />A = Surface area of circular portion of cone. <br />h = Height of the cone <br /> <br />The frustrum of a cone, which is the volume between two <br /> <br />bases is computed as: <br /> <br />V = Vah (A + A 2 + ..J A A ) <br />1 1 2 <br /> <br />(4) <br /> <br />where: <br /> <br />h = Distance between the two bases. <br />A lA 2 = Surface areas of base 1 and 2. <br /> <br />7-72 <br />