140 LANDS OF THE ARID REGION OF THE UNITED STATES. 
At Monroe a stream issues from the Sevier table, and is used for the 
irrigation of the field cultivated by that settlement. Its flow is estimated 
at 40 feet in the middle of July. At Richfield, on the other side of the 
valley, is a stream coming from the Pavant, with a flow of about 20 feet, 
and at Glencove a stream of 25 feet. At Salina is a large tributary issuing 
from a great canon through the north end of the Sevier Plateau, and its 
measurement indicated a flow of 165 feet. The total between Monroe and 
Salina, inclusive, would thus reach 250 feet, to which might be added 
some smnaller tributaries, not specifically mentioned, amounting perhaps to 
10 feet, giving a total of 260 feet. Adding this to the tributaries between 
the upper forks and Joseph City, and to the main river itself, we have, as 
the total above Gunnison, 1,320 feet. This estimate being for the early 
part of July, and obviously largely in excess of the amount which is 
available at the critical period, in the last week of that month and the first 
week in August, what allowance should be made for the diminution of 
supply during the month of July it is difficult to determine. The smaller 
tributaries, as a rule, shrink much more than the larger. Those which enter 
the stream lower down decline more during July than those which join it 
farther up. ‘Taken altogether, I am satisfied that it would be unsafe to 
estimate the irrigating capacity in the first week of August at more than 
60 per cent. of that found in the first week of July, and I regard 50 per 
cent. as a much more probable estimate. For want of a better one, | adopt 
it, and this gives the estimated irrigating capacity of the Sevier and its 
tributaries above the junction of the San Pete at 660 cubic feet per second 
during the critical period. 
The water supply in the San Pete Valley was measured by Mr. 
Renshawe during the latter part of July, and found by him to be as 
follows: 
Volume of flowing water, in cubic feet per second, of streams in San Pete Valley. 
Feet 
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Fountain! Green.ss Vote sites ae ace nae ser baa cate neces ee a eeeenne Meets ores Sialslniciovtersioteleteletemte 10 
