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<br />CONTENTS (Continued) <br /> <br />Draina~e (Continued) <br /> <br />Chapter I Introduction (continued) <br />Project drainage facilities and cost estimate 10 <br />Chapter II Investigations... .' '__' 12 <br />Investigations program. . . . . . . . . . . . 12 <br />Subsurface exploration. .. . . . . . . . 12 <br />Deep hole drilling, sampling, and testing. 12 <br />Escarpment observations. 14 <br />Gradation analyses . . . . . . . . . . . 14 <br />Seismic probes . . . . . . . . . . . . . 14 <br />Land classification borings and studies. 14 <br />Compilation and analysis of data 14 <br />Permeability studies. 20 <br />Water table studies 21 <br />Quality of water. . . 21 <br />Topography. . . . . . 21 <br />Methods of estimating drainage requirements 22 <br />Investigations required during irriga- <br />tion development. 22 <br />Chapter III Red Mesa area. . . 25 <br />Location. . . . 25 <br />Lands and water 25 <br />Geology . . . . 25 <br />Physiography. . 26 <br />General configuration. 26 <br />Drainage network . . . 28 <br />Soils and subsurface materials. 28 <br />Stratigraphy, texture, and structure 28 <br />Unconsolidated materials. 28 <br />Soils . 29 <br />Gravels . 29 <br />Bedrock . 32 <br />Permeability 32 <br />Salinity and alkalinity. 37 <br />'Ground water table. . . . . 39 <br />Existing drainage facilities. 39 <br />Drainage characteristics of project lands 41 <br />Naturally drained lands. 41 <br />Drainage-deficient lands 41 <br />Drainage requirements 42 <br />Chapter IV Dry Side area. . . 43 <br />Location. . . . 43 <br />Lands and water 43 <br />Geology . . . . 43 <br />Physiography. . 44 <br />General configuration. 44 <br />Drainage network . . . 47 <br /> <br />Pa~e <br /> <br />v <br />