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<br />.~,! I ~ :-... <br />L .:1(... u <br /> <br />. <br /> <br />be a.dequa.te to l'r~V8_1t the overflow of tt.e da", i:,: t:~=-:es <br /> <br />45 <br /> <br />of high wator aft~r such overflow ba~~ne urclesir[ilile. <br /> <br />When t~i3 structure had reacied t~e desi~ed height <br /> <br />and slopas, t~1.::~ 3:(1ti~e .1I.pstrean faco \vonld b03 tro"Jgbt to <br /> <br />~~ ~ven slopa by depoeiting rnn~llzr roc~ until the 3t~i~ce <br /> <br />Wd,S OI!looth eno-,,1g..':l to be paved :,it;, concrete. A concrete <br /> <br />pavemJnt wo~ld th"n be provided or considerable thickness <br /> <br />anQ rei~orced with ste31. This ~rou1d cover the entir~ <br /> <br />face of th3 d~ from the river bed to ~'e top and would bs <br /> <br />securely s8ale~ to t~e cliffs on sitne, side to prsvent <br /> <br />percolation thro~~ the dam so far as practicable. <br /> <br />Prior to placing the coff~r dan or arv of the rock <br /> <br />fill, it is proposed to drive a row of sheet steel piling <br /> <br />. <br /> <br />as deaply as p:...~acticab18 acrO::i.; t;13 upstream toa of t:13 dnm <br /> <br />to be later conr~cted and sealed firmly to the tee of the <br /> <br />COnC:L'3t:;! pav~:nent O~"1 tl18 1,'/at3r fac.e of the datil. <br /> <br />'!lhe pla.ciLg of the rock fill 3l1o"\11d be cOf:l)leted a. <br /> <br />yei:U" or ..nOTa J,Jfor~ begin!1ing the cOLstruction of thC3 c.on- <br /> <br />creta pave~ent. This time \~uld be occupied in slopi~g up <br /> <br />t...1.e watdr f.J.ce prepa=atcry to plE..ciJ.1g .~ha pa"rement. The <br /> <br />co"s truction ef the P3.'l&ffi,',Jl t HOule. be 30 plaomed that the <br /> <br />se;,;liing of tm p.:lVOlJ13nt to t:le ::OC~( of the abut~ents would <br /> <br />be t113 la'.:,t finishi:::!g tuue:l of the darn so as to give the <br /> <br />maS3 the u1aXi~ ti~a fo~ ~Bttla~~~t ~3for3 ~king thiE junction. <br /> <br />. <br />