. The design of a hydro-electric plant at Ottawa, Illinois . 50 -26 Highest temperature at Ottawa for 21 ^^ears. 65 65 83 92 99 103 112 103 102 90 75 64 112 The yearly rainfall is one of the most important items in thedevelopment of a hydro-electric plant. The rain fall of course controlsthe yearly runoff and the discharge of the river. Data for the rainfallin the years of 1900,1903 and 1908. The curve that is drawn for the year1903 is the one that will be used in calculations. The rainfallcomes in the months of June and July. At this time very heavy floodsare apt to occur. It wou
. The design of a hydro-electric plant at Ottawa, Illinois . 50 -26 Highest temperature at Ottawa for 21 ^^ears. 65 65 83 92 99 103 112 103 102 90 75 64 112 The yearly rainfall is one of the most important items in thedevelopment of a hydro-electric plant. The rain fall of course controlsthe yearly runoff and the discharge of the river. Data for the rainfallin the years of 1900,1903 and 1908. The curve that is drawn for the year1903 is the one that will be used in calculations. The rainfallcomes in the months of June and July. At this time very heavy floodsare apt to occur. It would seem that the river would be at its highestinthe fall of the year but thru -it all the records that have been takerthis is not the case. However the river comes up to the same heightin the fall that it does in the foregoing months but this lasts a few June 1902, inches of rain was recorded,whilefor the same month 1905 only inches of rain fell. It may also benoted that for the year 1902 in June the greatest amount of rain fell. that has heen recorded in the last tv/enty-five years. This vfai: a 3earof great floods thru out the United J^tates and of course this f^ives acondition that must be taken into account in case it should again comeafter the plant had been installed. The annual rainfall for the year1902 was inches. This is ab ut ?0 inches more than falls in theaverage year. The next highest came in 1907 when inches was record-ed. The minimujp. rainfall comes in October,the lowest amount being notedin 1904,when only .6 inches fell. In case of such a design the ca-acity of the reservoir is some-thing that has to be carefully considered. The volume of water thatpasses the section of the river where the dam is tc be located islimited between 6700 cubic feet per second and 47000 cubic feet persecond. This of course is dependent on the timp of the year,but thevariation of the river is rather great in the spring time owing to theheavy rai
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