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<br />47 <br /> <br /> <br />OC1829 <br /> <br />. <br /> <br />nnd represents the flood for which the dam Clnd reDervoir, together, <br /> <br />]Jlust be desigrwd. HydrogrnphB of the same type llre o.dopted for the <br /> <br />probo.ble floods of the 50-yei'r o.nd lesser frequency, lihilo that for <br /> <br />the 1925 flood, as shown, governs flows of great0r frequency. OVer <br /> <br />drainage uree.s less in extt,nt.. <br /> <br />fE!?hitble F'lo.ods <br /> <br />There are t\!O types of floods chc..rLcteristic of this ".rGt,: <br /> <br />onG QS the result of loce.I "cloudbursts" which occur "very year with <br /> <br />varying magnitudes, and the other from general rains of which only <br /> <br />one is of record (l904). The distinction is clear cut, the former <br /> <br />resulting in a high peak discharge vlith reliit:Lvely small volume and <br /> <br />. <br /> <br />tIw latter combining both large discharge and volume. <br />Tho folloVi.lng cOI:1pilation of flood d.:,to. shows the nw:tbor <br /> <br />of floodil of vccrious w:cgni tudcos recordod "t Trirdd,,([ for the period <br /> <br />1922-1937, vlith the addition of thet of 1904. <br /> <br />EurJber of Floods <br /> <br />. <br /> <br />1,00012,000 l6,000 .- <br />5,000 7,000 9,000 l2,00O 20,000 25,000 !,5,000 <br />S.F. S.F. S.F. S.},!'. S.F. SIF. S.F. S.l1'. . SIF. S,Ft <br />or or or or or or or or or or <br />OV".t_ pY<2.f over over .,....Qver over over OVGr over over -- <br />120 77 4l 25 l7 II 4 3 2 .. 1 <br /> . --~ <br />--.....-. - - <br />100 200 500 1000 2000 !,OOO gOOO 45000 <br />A.F. .Lt.li'\. A..F. lLF It.F' I 1\.F J.~:..F . .A.F... <br />or or or 01' or or or I or <br />over O'-':Y1: I-:over over over -- over ..Q.Y..er over <br />. <br />l20 105 75 4.3 l5 I 4 2 1 <br /> i ..-.- <br />-- <br />