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<br />. A conventional concrete parapet wall of varying height (depending on the specific plan <br /> <br /> <br />altemative) will be constructed along the upstream crests of both dams_ to each abutment and <br /> <br /> <br />to the training walls of the new RCC spillway section. The parapet wall can increase the <br /> <br /> <br />head available by one to three feet, reducing the required width of the spillway. <br /> <br />The following sizing alternatives for Plan C are evaluated in Chapter V: <br /> <br /> <br />.........................tMaximum.... \..... <br />-.-.- -. -----....-. <br />.................... .... -- <br />.....---....... ......---.....--......_,....... <br />.....................?D. j~~lj~r.ge...................... <br />..-----..-...-.-.-..-.-..--.-......----. <br />.....--...... _____. ..... ." <br />......................(.......1:.)........................... <br />.------......._.....'.- . -...-.... <br />........}......}.... ~. S.t... <br /> <br />iJ.>:ir~pe~}...... Max:\V~ffl'\~~~~C~ <br />........p:eigbtti .. .... ........Eleya.tiOil .. ..... <br />i.J(feetY> ... . <br /> <br />C-I <br />C-2 <br />C-3 <br />C-4 <br /> <br />200 <br />140 <br />95 <br />65 <br /> <br />10,988 <br />9,409 <br />7,625 <br />6,053 <br /> <br />o <br />I <br />2 <br />3 <br /> <br />5,358 <br />5,359 <br />5,360 <br />5,361 <br /> <br />D. Plan D - Overtopping Protection for the North Dam <br />Plan D alternatives generally consist of constructing a nonerodable facing for the north dam <br />of the reservoir as shown in Figures IV-4, IV-5 and IV-6. A stepped RCC facing would allow the <br />entire dam to be overtopped during an extreme hydrologic event without damage. By utilizing the <br />entire dam width the overtoppable dam crest could be situated at an elevation above the existing <br />spillway, or a fuse plug could be constructed, causing more frequent spillway flows to proceed out <br />of the existing spillway. Plan D-I has the spillway crest placed at the 100-year flood level of the <br />reservoir assuming the existing spillway is to function alone up to the 100-year flood. In Plan D-2 <br />the spillway crest is 1.4 feet lower than the 100-year flood level and a fuse plug would be <br />constructed on the spillway crest to a height equal to the 100-year flood level. <br /> <br />Hydrologic analysis of Plan 0-1 shows that the top of the north dam can be reduced to <br />elevation 5,354.6 without the design flood overtopping the south dam if the south dam is raised. <br /> <br />20 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />