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. :/ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I. . . . . I. . I. . . . \: . . 8-07. Hydroelectric Power. There are currently no hydroelectric facilities to create hydroelectric power at Ridgway Darn. 8-08. Navi liation. There are no navigational benefits due co the water control plan, because the Uncompahgre River is not a navigable stream. Navigation is not a project purpose. 8-09. Droul'ht Contin~encv Plans. There are no formal Drought Contingency Plans for Ridgway Dam and Reservoir. Conservation storage in Ridgway Reservoir is managed by the TCWCD in accordance with water service commcts. During droughts, the rewCD can be expected to conserve water to the best of their abilities. The water conrrol diagram has a drought contingency incorporated within the parameter. Therefore, when there is a drought, the top of conservation is very high and the USBR can fill the reservoir, accordingly. 8-10. Flood Emeraencv Action Plans. The USER. has prepared an Emergency Action Plan (EAP), a component of the Standing Operating Procedures (SOP). The EAP covers actions to be taken in various emergency situations (i.e., oil pollution, landslides. and project security). The plan was prepared to minimize impacts during a flood emergency. Funher detailed information on flood emergency action plans can be found in the USBR's SOP, which. is referenced in Section 1- 03, Related Manuals and Reports. 8-1 t. Frequencies a. Unre~lated Flow Frequencies. Unregulated flows and statistical parameters for snowmelt floods for the Uncompabgre River at Ridgway Dam and Colona. are tabulated in Tables 8-3 and 8-4, respectively (see page T8-1). Snowmelt flow frequency curves for I-day, l5-day, 30-day, 60-day, 90-day, and lIO-day flows are shown on Pla(es 8-4 and 8-5, respectively. The curves were based upon criteria contained in Bulletin l7B. "Guidelines for Detennining Flood Flow frequency," published by the U.S. Water Resources Council. A conditional probability adjustment was applied to the data. The fmal statistics were adjusted to allow for orderly transition between curves of different durations. b. Regulated Flow Frequencies. For the Uncompahgre River at Colona, maximum one- day curves for regulated and unregulated conditions, are shown on Plate 8-6. The regulated curve was developed entirely through hypothetical tQutings. c. Pool Elevation Duration and Frequency. The Pool Elevation-Frequency Curve is shown on Plate 8-7. It was developcd by routing hypothetical events through the reservoir. The Pool Elevation-Duration Curve, Plate 8-8, and the Seasonal Variation of Reservoir Storage 8-4