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Show - FLOOO FlOOD ftOUDCONIRO3TUDIESSED CONTROL L STUDIES SHEDNEW SHfO SHfONEW HNE/ HNE HNENIIGNT NEW NIIGNT / 11GHT lIGHT ON PROBLEM I ISalt ; I ISalt Salt Lake City , Nov 29The 29-The 29 The 29 -The The - The character char- char character - . | acter of counhy counby country locks rocks is a factor fa tor in m mflood inflood [ flood contiol conbol control that flood investigatorsfrequently mvestigators investigators mvestigatorsfrequently investigatorsfrequently frequently overlook , according to Clif Clifford Clif- Clif Clifford Clifford - , ford J Okeson , bachelor of geologicengineering geologic geologicengineering I Iengmeermg engmeermg engineering , U of U , whose study on onErosion onErosion I ) IErosIOn ErosIOn Control in Salina Canyon ' ' ! ' ! sheds sneas new lIght ngnu on un the me flood nuua control cumiui I ) Iproblem | mteimounItain problem of Utah and the mteimoun- mteimoun mteimoun-I I mteimoun-I mteimoun I mteimounItarn mteimounltain - ltain tain tarn country , and alco al'o alo al : ' blasts the thetheory thetheory , theory that blanket prevention meas.1 meas1 measI measures meas.1ures meas- meas measIures - . I Iures ures can be used wilh WITh equal success In Inall inall inall InI I all regions The paper was given at atthe atthe atthe the recent convention of the UtahAcademy Utah UtahI UtahAcademy UtahAcademy I Academy of Science . In his paper , Mr Okeson pointedout pomted pointed I 1 1out Iout out that the areas in Salina canyonwhere canyon canyonwhere I where the run-off run off run-of of - ! is greatest , are un underlain un- un underlain . - derlain by tertiary and certain certam cre- cre cretaceous cre ere cretaceous - . taceous sandstones that are cemented cementedtogether cementedtogether cementedtogether , together by a line l1ne clay Impregnated Impregnatedwith impregnatedwith impregnatedwith with soluble sulphates and other salts saltswhich saltswhich saltswhich which make them extremely susceptible susceptibleto to erosion In these non-resistant non resistant - for- for formations formations for formations - mations where decomposition is not notstayed notstayed notstayed stayed , the soluble sulphates and cal calcium cal- cal calcium calcium - cium carbonate are leached out byground by byground byground ground waters wat.ers . in early spiing spling spring , with theresult the theresult theresult result that the sand grains grams are heldtogether held heldtogether heldtogether together only by slay particles particlesSubsequent particlesSubsequent particlesSubsequent Subsequent rains tend to swell sv.ell svell ssell . the theclay theclay theclay clay particles pai pal tides ticles into and almost putty- putty puttylike puttylike putty-like putty like - like impcr\ impcr lIl1pcn impcriousness rmpcrtiousness \ iousness , with the result resultthat resultthat resultthat that , instead lnsteaa mstead of percolating thlOUgh through throughthe thlOUghthe thioughthe the : ; soil 011 , the water is shed off by the theclayey theclayey theclayey clayey veneer and moves into nearby nearbydeclevitIes nearbydeclevities nearbydeclevities declevitIes whence it finds its way to tothe tothe tothe the large gulches gulche where great havoc is iswrought iswrought iswrought iswroughtThp wrought wroughtThp wroughtThe Thp The lack of vegetation is not somuch so somuch somuch much a problem of soil chemistry asit as asit asit it is of soil sOlI physics physic.s . , according to MrOkeson Mr MrOkeson MrOkeson Okeson Soil Sol1 of this . kind 1.ind 1ind is rich richenough richenough richenough enough to sustain almost any kind hind of ofmdigenous ofindigenous ofindigenous mdigenous indigenous vegetation , but the flow of ofrain ofrain ofrain rain must be checked longpnough long enough pnough to toenter toenter toenter enter the soil and thus enable vegeta vegeta- vegetation vegetation vegetation - - tion barriers to get g'Lt gLt ' stirtcd st'1rted st1rted st'irted stirted ' ' This has hasbeen hasbeen hasbeen been done with success in some parti parts par partsof partiof > of the legion region where dams have been beenbuilt beenbuilt beenbuilt built across gulches to check the flowof 1'low 1low flow 1'lowof flowof ' of water so that sediments are de deposited de- de deposited deposited - - posited The writer assailed rodentsas rodents as a no cause of much headwarfl headward arc1 cutting |