Laserfiche WebLink
<br />00241 7 <br /> <br />RECLAMATION RESERVOIR DATA DEFINTIONS <br /> <br />General <br /> <br />Dam design and reservoir operation utilize reservoir capacity and water surface elevation <br />data. To ensure uniformity in the establishment, use, and publication of these data, the <br />following standard definitions of water surface elevations and reservoir capacities are <br />used throughout Reclamation. Reservoir capacity as used here is exclusive of bank <br />storage capacity. <br /> <br />Water Surface Elevation Definitions <br /> <br />Maximum Water Surface.-The highest acceptable water surface elevation with all <br />factors affecting the safety of the structure considered. It is the highest water surface <br />elevation resulting from a computed routing of the inflow design flood through the <br />reservoir under established operating criteria. This surface is also the top of the surcharge <br />capacity . <br /> <br />Normal Water Surface.- The highest elevation that water is normally stored, or that <br />elevation which the reservoir should be operated for conservation purposes. <br /> <br />'---../ <br /> <br />Top of Exclusive Flood Control Capacity 0" The reservoir water surface elevation at the <br />top of the reservoir capacity allocated to exclusive use for the regulation of flood inflows <br />to reduce damage downstream. <br /> <br />Maximum Controllable Water Surface Elevation.-The highest reservoir water surface <br />elevation at which gravity flows from the reservoir can be completely shut off. <br /> <br />Top of Joint Use Capacity.-The reservoir water surface elevation at the top of the <br />reservoir capacity allocated to joint use, i.e., flood control and conservation purposes. <br /> <br />Top of Active Conservation Capacity.-The reservoir water surface elevation at the top <br />of the capacity allocated to the storage of water for conservation purposes only. <br /> <br />Top of Inactive Capacity.-The reservoir water surface elevation below which the <br />reservoir will not be evacuated under normal conditions. <br /> <br />Top of Dead Capacity.- The lowest elevation in the reservoir from which water can be <br />drawn by gravity. <br /> <br />Streambed at the Dam Axis.- The elevation of the lowest point in the streambed at the <br />axis or centerline crest of the dam prior to construction. (This elevation normally <br />defines the zero for the area-capacity tables). <br /> <br />I <br />I <br />--' <br />.~: " <br /> <br />-I <br /> <br />.'::."- <br /> <br />.' . <br /> <br />I <br /> <br />I <br />, <br />