^ * — !W 
UNITED STATES DEPARTMENT OF AGRICULTURE 
DEPARTMENT BULLETIN No. 1340 
Washington, D. C. T October, 1925 
IRRIGATION REQUIREMENTS OF THE ARABLE 
LANDS OF THE GREAT BASIN 
SAMUEL FORTIER, Associate Chief of the Division of Agricultural Engineering 
Bureau of Public Roads 
CONTENTS 
Page 
Introduction 1 
Units and Forms of Expression 3 
The Great Basin 4 
General Character of the Soils of the Great Basin 5 
Climatic Conditions 6 
Water Supply 6 
Agricultural Products 12 
The Relation of Irrigation Water to Crop Production 13 
Time of Irrigation 19 
Conditions Influencing the Quantity of Water Required for Irrigation 29 
Water Requirements as Affected by State, Community, and Corporate Regulations . 33 
Lands to be Reclaimed 37 
Seasonal Net Water Requirements 38 
Use of Water on Crops in the Great Basin 39 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1925 
