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<br />'~J <br />00 <br />~ <br />N <br />;;::> <br /> <br />CONTENTS <br /> <br />&~m h~ <br />Introductory statement_ _ _ _.__ _~__________________h____h _____ II <br />Engineering orga.nization during construction _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ VI <br />Forevvord____________~________________________________________ VII <br />OOntents_____________________________________________________ rx <br />List of tigures_________________________________________________ xv <br />List of tables__________________________________________________ XV!I <br /> <br />CHAPTER I-IMPERIAL DAM AND THE COLORADO <br />RIVER <br />1 Introduction_________________________________________________ 1 <br />2 Yuma project________________________________________________ 3 <br />3 Gila project__________________________________________________ 5 <br />4 Imperial Valley_______________________________________________ 8 <br />5 All-American CanaL__________________________________________ 11 <br />6 Personnel____________________________________________________ 13 <br />7 Blbliography_________________________________________________ 14 <br /> <br />CHAPTER II-PRELIMINARY INVESTIGATIONS <br />INTRODUCTION <br />8 ~rlysurveyi_____.___.______________________________________ 15 <br />9 Laguna Ds.m and 8Iuiceway__________~_________________________ 15 <br />10 Seleotion of site for All-Amerio').n Canal diversion_________________ 17 <br />11 Problems involved____________________________________________ 18 <br />12 Geological conditions_________________________________h_______ 19 <br />13 Arizona:. abutment- _________~_______.h______________h_______ 20 <br />14 Elydrology___________________________________________________ 21 <br /> <br />SECURITY OF DAMS ON EARTEl FOUNDATIONS <br /> <br />15 Need for study_______________________________________________ 23 <br />16 Theoretical considerations_ _ _____.______ __ ______________ __~____ 24 <br />17 Assumptions zna.de in design_____.____________~___h___________ 25 <br />18 ConclumoDB_____________.____________________________________ 26 <br />19 Results of study_______________________________ _______________ 28 <br /> <br />TElE SUSPENDED LOAD <br /> <br />20 Early investigations___________________________________________ 28 <br />21 Changed river conditions_________________________u___________ 29 <br />22 Qua.ntity and grain size______________.________________________ 29 <br />23 SaU1plingprograU1____________________________________________ 30 <br />24- Silt-dischl1l'ge relation________________~________________________ 30 <br />25 Future silt loa.d of the Colorado River___________________________ 34 <br />26 Conclusions of Board of Engineers_________.____________~_______ 37 <br /> <br />EXPERIMENTAL INVESTIGATIONS <br /> <br />27 Denver hydraulic laboratory studies____________________________ 89 <br />28 Field hydraulic laboratory work________________________________ 40 <br />29 Results of field model tests____________________________________ 42 <br />30 Concrete test piles____________________________________________ 43 <br />rx <br />