TABLE OF CONTENTS (Continued) 



Page 



Effective and Critical Placement of Tile Drain .... 19 



Physiographic Positions I9 



Recent Alluvial Fan I9 



Older Alluvial Fan 20 



Basin Rim 20 



Basin 20 



Tiled Acreages within Physiographic Positions ... 21 



Soils and Soil Characteristics 21 



Morphology and Genesis 21 



Description of Soils 22 



Soils on Recent Alluvial Fans ....!!!!!] 2^ 



Soils of Older Alluvial Fans ', [ 24 



Soils of the Basin Rim Position [ 25 



Soils of the Basin Position ', 25 



Climate 26 



Temperature 26 



Precipitation 27 



Agriculture and Agricultural Practices 27 



Crops 28 



Current Irrigation 29 



Sources '.'.'.' 29 



Types of Irrigation ........'.'.'.'.'..', 29 



SECTION IV. METHODS AND MATERIALS 3I 



Monitoring Tile Drainage Systems 31 



Historical Monitoring 3I 



vaii 



