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<br />0::.;1862 <br />. <br /> <br />recently been constructed acrose the river below Trinidad and <br /> <br /> <br />although it may not be totally destroyed by a flood of this size, <br /> <br /> <br />it is estimated that damages in the amount of fully $20,000 <br /> <br /> <br />would result. The total estimated damages for a flood of the <br /> <br /> <br />1904 calib<Jr is then $301,000, which includes $25,000 damage <br /> <br /> <br />to landS and improvements as before. <br /> <br /> <br />A l,OOO-year flood v,ith its highly erosive velocities <br /> <br /> <br />would not only more completely destroy bridges and irrigation works <br /> <br /> <br />than the 1901. flood, but it would In addition be accompanied by <br /> <br /> <br />oxtensive channel changes. Heavy streum flows across farm lands <br /> <br /> <br />would Grode fertile surface soils in some places and deposit <br /> <br /> <br />infGrtile sand D.nd gravel bars in others. Crop and l,"nd damages <br /> <br /> <br />extending over several yec\rs following, together with damages <br /> <br /> <br />to farm improvements, are estimated at one-hillf their current <br /> <br /> <br />selling value of $57 Qn Qcre, or $570,000. DnmQge to irrigation <br /> <br /> <br />systems, bridges, und highwClYs i.B estimat.ed Qt $200,000 or roughly, <br /> <br /> <br />double the damnge with the 1904 flood, making a tokl damClge of <br /> <br /> <br />l~770,000 bDlow Trinidad for the I,OOO-year flood. <br /> <br /> <br />Records by the Water Commissioner show average annual <br /> <br /> <br />cost of improvements and maintenance for cll cQnu1s to be about <br /> <br /> <br />$ll,OOO. Although this indudes Cleaning of cD.mls and s orne im- <br /> <br /> <br />provements thereto, it is reQsonable to bGlieve that at leQst <br /> <br /> <br />$5,000 of this Qmount mQY bo attributed to floods causing excessive <br /> <br /> <br />silting and canal brectks neQr the int"kes. This figure is th"re- <br /> <br /> <br />fore adopted for aV<Jrnge do.muge per year for floods of from l- to <br /> <br /> <br />lO-yeur frequency. <br /> <br />. <br /> <br />. <br /> <br />76 <br /> <br />