OFFICE OF PUBLIC ROADS AND RTJBAL ENGINEERING. 375 



is maintained at Denver, Colo., and a report of results at this labo- 

 I'atory has been prepared and accepted for publication in the Journal 

 of Agricultural Research. Laboratory studies of the movement of 

 moisture in soils have been carried on at Riverside, Cal. 



PUMPING FOR IRRIGATON. 



The work under this project has consisted of giving advice to 

 farmers on the engineering features- of jDumping equipment; the 

 collection of information regarding the seasonal cost of pumping; 

 mechanical tests of pumps and pumping plants; studies of wells and 

 well casings with reference to supplying water for irrigation ; studies 

 of the possibilities of securing a water supply by piunping in specific 

 localities. Reports on pumping for irrigation in Kansas and Ne- 

 braska and on seasonal cost of pumping in the same territory have 

 been prepared for publication during the year. Work under this 

 project has been carried on in cooperation with the University of 

 Nebraska, the University of Nevada, the New Mexico AgricuUural 

 Experiment Station, and the Texas Board of Water Engineers. 



APPLIANCES AND EQUIPMENT FOR IRRIGATION. 



This project includes studies and experiments for the improve- 

 ment of irrigation equipment of all kinds, including dams, canals, 

 reservoirs, structures of all kinds, and miscellaneous equipment. 

 New and improved measuring devices have been designed and tested ; 

 a new spraying nozzle has been designed and public patent obtained; 

 a new type of pipe for conveying water under pressure has been 

 designed and tested; Farmers' bulletin on farm reservoirs has been 

 prepared and published; and a report on chutes and drops is in 

 preparation. 



FLOW OF WATER IN DITCHES, PIPES. AND OTHER CONDUITS. 



The work under this project consists of technical studies to work 

 out formulas for the flow of water in the various types of conduits 

 used to convey water for irrigation. A bulletin on* flow of water in 

 wood stave pipe has been issued ; data for a similar bulletin on flow 

 in concrete pipe have been prepared ; and work on the flow in metal 

 pipe has been begun. 



MEASUREMENT OF WATER FOR IRRIGATION. 



This work consists in laboratory and field experiments to develop 

 devices for measuring water for irrigation. Laboratory experiments 

 were carried on in cooperation with the Colorado Agricultural Ex- 

 periment Station, at Fort Collins, Colo. On the basis of the experi- 

 ments made, plans for two new devices have been prepared, and 

 articles describing the devices and giving discharge formulas and 

 tables have been published in the Journal of Agricultural Research. 

 These devices have been installed and tested under field conditions. 



CUSTOMS, REGULATIONS, AND LAWS RELATING TO IRRIGATION. 



Under this project are carried on studies of the influence of cus- 

 toms, regulations, and laws relating to irrigation, on the success of 

 farmers practicing irrigation, on the reclamation of arid lands by 



