85 



tiai-t oct'upies tlie middle portion of the valley. In order to ol)t<iin a 

 fair test for tiie entire valle}' three other tracts of land were selected 

 in other sections of the valley. 



IIAKLAN DITCH. 



The ITarlan ditch diverts Avater from the Bitter Root River near the 

 C'omo bridge and carries water to the farm of Mr. W. U. Harlan. 

 This farm consists of a gravel and sand wash from a canyon entering 

 the valley from the east. The area irrigated was S3 acres. The water 

 was measured near the upper end and a small loss was sustained in 

 transmission and 25 per cent was wasted at the lower side of the farm. 

 The discharges given below are 25 per cent less than those shown by 

 the measurements: 



Duty of \rater under ]V. li. Harkni's ditch for tJie aecison of 1903. 



B.\.SS RROTHEKS DITCH. 



Bass Brother.s' ditch diverts water from a small stream of the same 

 name which is a tributary of the Bitter Root River. This ditch irri- 

 gates about 400 acres of very fertile land on the west side of the Bittei- 

 Root River al)out 5 miles northwest from Stevensville. The soil of 

 this farm i.s a compound of decomposed granite and vegetation, with 

 some sand and gravel. It is about 2 feet deep and slopes quite rapidl}^ 

 toward the middle of the valley. 



On INIay 2G, 1903, a rating flume was placed in the ditch as it enters 

 the field. The record of gauge height was kept by an automatic regis- 

 ter. There were no seepage losses of noticeable quantity. The 

 monthly discharge and the depth of irrigation are given in the follow- 

 ing table: 



Duty of ivater under Bass Brothers' ditch, for the season of 1903. 



