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<br />O ' " --. 'J5 <br />J ii.,; ,) - <br /> <br />" <br /> <br />Reservoir <br /> <br />General. - Dam design and reservoir operation use reservoir capacity and water <br />surface elevation data. To ensure uniformity in the establishment, use, and <br />publication of these data, the following standard definitions of water surface <br />elevations and reservoir capacities shall be used. Reservoir capacity as used <br />here is exclusive of bank storage capacity. <br /> <br />Surcharge Capacity. - The reservoir capacity provided for use in passing the <br />inflow design flood through the reservoir. It is the reservoir capacity between <br />the maximum water surface elevation and the highest of the following elevations <br />(1) top of exclusive flood control capacity, (2) top of joint use capacity, or <br />(3) top of active conservation capacity. <br /> <br />Total Capacity. - The reservoir capacity below the highest of the elevations <br />representing (I) the top of exclusive flood control capacity, (2) the top of <br />joi nt use capacity, or (3) the top of act ive conservation capacity . Total <br />capacity is used to express the total quantity of water which can be impounded <br />and is exclusive of surcharge capacity. <br /> <br />Live Capacity. - That part of the total reservoir capacity which can be withdrawn <br />by gravity. This capacity is equal to the total capacity less the dead capacity. <br /> <br />Active Capacity. - The reservoir capacity normally usable for storage and <br />regulations of reservoir inflows to meet established reservoir operating <br />requirements. It extends from the highest of (I) the top of exclusive flood <br />control capacity, (2) the top of joint use capacity, or (3) the top of active <br />conservation capacity, to the top of inactive capacity. It is also the total <br />capacity less the sum of the inactive and dead capacities. <br /> <br />Exclusive Flood Control Capacity. - The reservoir capacity assigned to the sole <br />purpose of regulating flood inflows to reduce possible damage downstream. In <br />some instances, the top of exclusive flood control capacity is above the maximum <br />controllable water surface elevation. <br /> <br />Joint Use Capacity. - The reservoir capacity assigned to flood control purposes <br />during certain periods of the year and to conservation purposes during other <br />periods of the year. <br /> <br />Active Conservation Capacity. - The reservoir capacity assigned to regulate <br />reservoir inflow for irrigation, power, municipal and industrial use, fish and <br />wildlife, navigation, recreation, water quality, and other purposes. It does not <br />include exclusive flood control or joint use capacity. It extends from the top <br />of the active conservation capacity to the top of the inactive capacity. <br /> <br />Inactive Capacity. - The reservoir capacity exclusive of and above the dead <br />storage from which water is normally not available because of operating <br />agreements or physical restrictions. Under abnormal conditions, such as a <br />shortage of water or a requirement for structural repairs, water may be evacuated <br /> <br />5 <br />