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<br />..,. <br />ClO <br />.. <br />N <br /> <br />o <br /> <br />CONTENTS <br /> <br />iXI <br /> <br />ALL-AMERICAN CANAL HEADWORKS <br />&dion Page <br />70 Gate structure_ - - - --___ --- --__ ______ __ ____________________,.__ 91 <br />71 Roller gates and hoists_H_____________________________________ 91 <br />72 Pile footings_ _ _________ _ ____ __ ____ __ _______________ _ _________ 96 <br />73 Service bridge____________ _ __ __________________________ __ _____ 96 <br />74 Trash rack_ _ -_________________ ______ __ ____ ___________________ 96 <br />SLUICEWAY STRUCTURE <br /> <br />75 General_____________________________________________________ 99 <br />76 Nonoverflow structures_______ ________________ __ ____ __ _________ 99 <br />77 Gate structure and aprons____________________________________ 103 <br /> <br />OVERFLOW WEIR <br /> <br />78 Dimensions and loading__________________________________u___ 104 <br />79 Slabs and buttresses__________________________________________ 108 <br />80 Aprons______________________________________________________ 108 <br /> <br />GILA CANAL HEAD WORKS, ARIZONA ABUTMENT, AND DIKE <br /> <br />81 General arrangernent__________________________________________ 110 <br />82 River diversiollu____________ __ ___ ___ ____ __________________ __ _ 114 <br />83 NOlloverflow structure L_____________________________________ 114 <br />84 Gate structure L____________________________________________ 114 <br />85 Nonoverflow structures 2 and 3________________________________ 118 <br />86 Gate structures 2 and 3______ _ ____ __ __ ______ ____________ _______ 118 <br />87 Apron_______________________________________________________ 118 <br /> <br />CHAPTER IV-DESIGN OF DESILTING WORKS <br /> <br />INTRODUCTION <br /> <br />88 Volume of the suspended load__________________________________ 121 <br />89 Characteristics Of sedimentation basins_________________________ 122 <br /> <br />SELECTION OF TYPE OF DESILTING WORKS <br /> <br />90 Efficiency of Laguna desilting works____________________________ 124 <br />91 Flushingtype________________________________________________ 125 <br />92 Desilting heads and hoppers___________________________________ 126 <br />93 Rectangular plan_____________________________________________ 126 <br />94 Radial-flow tanks__ _ _ _ ___________u_____________________ _____ 129 <br />95 Skewbasins_________________________________________________ 131 <br />96 Rotary scrapers_ __ ____________________________ __ __ ___________ 134 <br /> <br />ALL-AMERICAN CANAL DESILTING WORKS <br /> <br />97 Gener&layout_______________________________________________ 136 <br />98 Intake canal_________________________________________________ 136 <br />99 Influent-channel gate structures____________________h__________ 138 <br />100 Influent channels__ _________________ ____ _________ _____________ 141 <br />101 Settling basins_ ___________ __ ____ __ ________________ ___________ 144 <br />102 Scrapers_____________________________________________________ 146 <br />103 Sludge disposal____ _ _____ __ ___________________u______________ 148 <br />104 Sludge galleries_______________________________________________ 149 <br />105 Pedest~____________________________________________________ 149 <br />106 ControL_______________ ______________ ______ __________ _______ 152 <br />107 Bypass and effluent channels___________________________________ 153 <br />108 All-AIDerlc"", Can!'! dikes_.___.________________ ________________ 154 <br />