IRRIGABLE LANDS OF THE VALLEY OF THE SEVIER. ibys) 
stream oceurs during the middle of August, just after, or sometimes even 
during, those irrigations in which the greatest amount is required. ‘The 
critical period of the crops occurs, therefore, just before, and sometimes 
dangerously near, the period of rapid decline in the water supply. It will 
therefore be evident that it is not a very easy matter to determine the exact 
stage of water which can serve as a criterion of the irrigating capacity. My 
own measurements, however, were hardly a matter of choice, but were 
made at the most advantageous period which could be selected without 
interfering with the primary objects of the expedition. 
The Sevier was measured at the junction of the two main forks, at the 
north end of Circle Valley, on the 6th and 7th of July. The method adopted 
was first to find a section of the water at a given point by soundings and 
by actual measurement of the width of the water surfaces, and measuring 
the surface velocity by means of floats. ‘The most probable mean result 
of several measurements was found to be 410 cubic feet per second for the 
East Fork, and 450 feet per second for the South Fork, or a total of 860 feet. 
While this measurement was made the South Fork was being drawn 
upon above for the watering of about 1,100 acres near Panguitch, 35 miles 
farther up the stream, and also for watering about 600 acres in Cirele Val- 
ley, about 3 to 4 miles above. The amount of water used in Circle Valley 
was probably greater than that at Panguiteh, since the method employed 
was much more wasteful, and no provision made for returning the tail 
water to the stream. On the other hand, a large proportion of the tail water 
from both places finds its way back to the channel in spite of waste, but 
how much it is impossible to conjecture. I think, however, that 75 cubic 
feet per second would cover the loss from these sources. 
Below the point of measurement the Sevier receives the following 
affuents: At Van Buren’s ranch is a cluster of very large springs, fur- 
nishing about 55 cubic feet per second. Between Van Buren’s and Marys- 
vale are three streams, yielding together about 30 feet, and Bullion Creek 
at Marysvale carries about 40 feet. There is still another affluent at 
Marysvale with about 30 feet. Finally, Clear Creek, north of Marysvale 
Canon, gives about 45 feet, making the total contributions between the 
junction of the forks and Joseph City about 200 feet. 
