. The design of a hydro-electric plant at Ottawa, Illinois . - waves and frost. The frost is the bi^g^st force and this vrill beallowed for by expansion joints. \Then the river stands at 33 feet the gate if v-ide open v;ill allowv/ater 10 feet deep to flov/ over the spillway. The following dimensionsgive the shape of the spillway such that the greatest amount of watercan be discharged over the spillv/ay in the shortest time. The curvev:hich any fallinr body takes when forced out in a horizontal plane and. 21. is acted upon by the fo^-ce of r-rnvity,forms a parabola. equation of theoxiwe i
. The design of a hydro-electric plant at Ottawa, Illinois . - waves and frost. The frost is the bi^g^st force and this vrill beallowed for by expansion joints. \Then the river stands at 33 feet the gate if v-ide open v;ill allowv/ater 10 feet deep to flov/ over the spillway. The following dimensionsgive the shape of the spillway such that the greatest amount of watercan be discharged over the spillv/ay in the shortest time. The curvev:hich any fallinr body takes when forced out in a horizontal plane and. 21. is acted upon by the fo^-ce of r-rnvity,forms a parabola. equation of theoxiwe is, 2 ,,y = 4 ax ,or it is representee by the line CPT on plate ffoga The shane of the spillv-a- will fbllovr directly alon,?; this line since, thisgives just the friction of the concrete against rater,^nr lo-^s not allov;any air pockets to get the dan and the water. Thia is very impor-tant f)r in sone former dam construction there was a great deal of troubledue to the away of the foundation of the dam and causing a completev/reck. This ivashing av:ay is due to the fact .that if the down stream sideis vertical ther. the water in falling over the spillvmy forms a suctionchamber between it and the dam,and the air pressure forces the water backagainst th-^ base,causing wear on this part. Plate26a will show the resultstaken fron thf^. practical design of the ogee dam which is the standard kindthe goverment installs. The vertical up stream side is rounded off at the top with aquarter
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