Table 

 Number 



TABLES 



Page 



Tile Acreages within Major Physiographic 



Positions of the San Joaquin Valley 



Floor, 1968 21 



Acreages and Number of Tile Systems 



within Different Soil Series and 



Physiographic Positions, 19do 23 



Average Annual Temperature at Selected 



Weather Stations Along the West Side .... 26 



Annual Precipitation at Selected 



Weather Stations Along the West Side .... 2« 



Acreage Tiled and Acreage Sampled for 



Nutrients In Major Tiled Areas 33 



Tile Drainage Systems and Acres Sampled 



by Soil Series and Physiographic Positions 



within the Major Tiled Areas, I908 3^ 



7 Average Discharge, Nutrient Concentrations, 

 and Total Dissolved Solids from San Joaquin 

 Valley Tile Drainage Systems 



8 Nutrients, Total Dissolved Solids and 

 Flows from Individual Tile Drains by Year . 



9 Hourly Variation of Flows, Nutrients and 

 Electrical Conductivity in Drainage 

 from Pour Tile Drainage Systems 



44 

 46 



.... 48 



10 Hourly Vs. Weekly Nitrogen Concentrations . . 49 



11 Average Discharge, Nutrient Concentrations, 

 and Total Dissolved Solids by Major 



Tiled Areas, 19^7 and I968 ->^ 



12 Comparison of Tile Drain Discharge by 



Various Crops ^ 



13 Tile Drain Discharge Vs. Irrigation 



Intensity within Major Tiled Areas, 19d7 • • O'^ 



14 Dissolved Oxygen Concentrations in 



Tile Drainage from Various Crops 0( 



Xlll 



