42 BULLETIN 1026, U. S. DEPARTMENT OF AGRICULTURE. 
the size of the head he desires turned out. The riders meet every 
morning at the office, list the demands, and compare them with the 
credits remaining. Then they cover their " beats " and set the various 
gates to deliver the amounts demanded. The water is measured over 
wooden rectangular weirs and the proper depth over the weir is de- 
termined from tables which show for each size of weir the discharge 
in Colorado statute inches, cubic feet per hour, and cubic feet per 
24 hours. The rider's records include a daily report and a separate 
delivery account for each user. The daily report of deliveries shows 
the name of the farmer drawing ; size of weir ; depth over weir ; hours 
run and total cubic feet delivered during the day, the day being 
reckoned from midnight to midnight. In the record of delivery kept 
by the rider each user is given a separate account in which is entered 
a complete record of all water drawn. In addition there is kept at 
the office at Wellington a water ledger containing a record of all 
credits and of all deliveries as compiled from the daily reports of 
ditch riders. From this ledger the state of any account can be de- 
termined at a glance. 
GROSS DUTY FOR CANALS. 
To serve as a basis for computing the duty of water measured at 
the heads of canals of the valley, the total area and the crops irrigated 
by each canal in 1916 and 1917 are shown in Table 9. Each canal 
is credited with all the land and crops irrigated by it, either alone 
or in combination with other canals. Overlapping of areas served 
by two or more canals, is the cause of considerable duplication of 
acreage in the table. The effect of the war may be noted in the large 
increase in food crops as well as in the appreciable increase in the 
total acreage irrigated. 
In Tables 10 and 11 the water used by the canals of the valley in 
1916 and 1917 is shown with a proper segregation of direct flow and 
stored water. Under the head of direct flow has been included water 
on direct appropriations, foreign water not stored, and certain ex- 
change water. Thus, Windsor Reservoir water delivered to Greeley 
Canal No. 2 in payment for No. 2 water taken above in exchange is 
classed as direct flow. On the other hand river water taken by the 
Larimer County Canal in exchange for water in Lindenmeier Lake 
is classed as stored water. 
