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<br />-s- <br />Settlement: The soils underlying the dan consist of soft to medium <br />stiff clays for about 30 feet in depth. These soils will consolidate <br />due to the imposed loadings of the enbanlc~ent. [•7e estimate approxi- <br />mately 12 inches of settlement for the maxim~un emban}~ent height. <br />Fig. 3E shows the approximate.settle~nent alon7.the centerline as well <br />as the time settlement. [•7e estimate at least 304s settlement will occur <br />during construction. Overbuild of the dam as well as caribering of the <br />outlet works will be required to compensate for settlement. Monuments <br />' will be established on the embank^~ent to nonitor_ettlement and <br />horizontal movement. <br />Seepage: The proposed dam will be constructed mostly fron claystone <br />• 'and clay soils. These materials are. essentially impervious ~.~hen <br />contacted to the specified density. The underlying soils also consist <br />of clays of low permeability. There will be so;~e underseenage beneath <br />the dam; however, this will not affect stability and will not be of <br />large volume. Complete control of seepage is not essential fra;~ an <br />operational point of view. <br /> <br />Outlet Works: The 18-inch dia-ieter CP1P outlet works will be placed at <br />elevation 7306. This is about 20 feet below the dam crest. Since some <br />settlement of the embankment will take place for a fairly lone period <br />of time after construction, we suggest the outlet works be cambered. <br />Camber on the order of 5 to 6 inches should be satisfactory. Seepage <br />rnllars are also suggested for the outlet works. There shaUld be a <br />• minimum of two seepage collars, one placed near each of the ends. <br />_~~ <br />'. ~ _ <br />