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002047 . where A is the reservoir surface area (L2) CI to C~ are coefficients in the pOlynomial (variOus units) The coefficients in the equation must be determined outside the program using one of the multiple regression programs available on most computer systems and programmable desk calculators. * They are computed by entering pairs of values of the surface storage volumes and corresponding surface areas. Coefficients that are insignificant or unused may be left blank on input. (3) Contents and outlet works capacities (Card 7-3). - Three levels or volumes are used to divide the reservoir into four zones with associated minimum and maximum outlet works capaci- ties, as shown in Figure 3. They are: Zone I - The DEAD STORAGE VOLU~IE marks the top of the dead storage, conservation, or inactive storage pool. When levels are in this zone, no water can be passed through the outlet works. The extent of this zone may be modified through use of variable constraints as described later. . Zone II - The SPILLWAY CREST VOLUME marks the top of the normal operating zone which is immediately above the dead storage zone. When the water level is in this zone, all releases are assumed controlled and the minimum required release is zero. The maximum allowable release is based on the MAXIMUM OUTLET CAPACITY. Zone III - The top of the spill zone is given by the DAM CREST VOLUME. When the water level is in the zone between the spillway and dam crests, provision is made for a minimum required release based on flows through uncontrolled spillway works. These are based on the MINIl-MI FLOOD CAPACITY, which may be zero. The maximum allowable release, based on the MAXIMUM FLOOD CAPACITY, includes controlled and uncontrolled spills along with all other outlet works operating at full capacity. Zone IV - When water levels are above the dam crest, it is assumed that the dam is overtopped and the entire . * For example, the well-known BMD programs. 2-5