CLASSIFICATION IN BELATION TO WATEK RESOURCES. 181 



XI. Cost of construction : 



1. Detailed estimate. 



2. Bases for estimate. 

 XII. Present status of project: 



1. Worls completed: 

 (a) Amount. 

 (6) Character. 

 (c) Criticisms. 

 XIII. Eevenue: 



1. Water rights. 



2. Number of acres covered. 



3. Number of acres sold. 



4. Town sites. 



5. State contract. 



6. Settlers' contract. 

 XIV. Appendixes: 



1. Maps. 



2. Geologic sheets. 



3. Photographs. 



4. Precipitation records. 



5. Stream-flow records. 

 XV. Suggestions. 



Recommendations. 



Conclusions. 



Extensions. 



To determine whether or not an area of land is commercially 

 feasible of reclamation by irrigation the following matters require 

 especially careful study: 



Available water supply. 



Present utilization of water for irrigation. 



Duty of water. 



Character of lands to be irrigated. 



Crops. 



Character of irrigation works. 



avah-abtit; wateb sttpply. 



To determine the available water supply a careful investigation 

 is made of the streams from which the water is to be diverted. A 

 study is made of all stream-flow measurements, and if records of 

 daily discharge are available for a number of years, hydrographs 

 are prepared showing graphically the daily fluctuations of the 

 stream. On these hydrographs a line may be drawn representing 

 the equivalent of prior rights. This done, the unutilized flow may 

 be readily determined. Where irrigation has been practiced for a 

 number of years, these hydrographs may show clearly that the normal 

 flow during the irrigation season is already appropriated and that 

 the unutilized flow occurs during the winter and during flood stages. 

 To utilize fully the run-off from the streams- under such conditions 

 reservoii-s must be constructed to store the water that is now wasted. 



