242 UNIVERSITY OF COLORADO STUDIES 



retain their original slopes of 2 : i and the grade is uniform. The channel 

 is composed of firm gravel and sand of which no pebbles are over one 

 half-inch in diameter, and is clean and free from vegetation. It has 

 been in use two years as a carrier of water for storage. See Figs. 1, 1a 

 and ib. 



Observation No. ib 



This experiment was performed on the above canal at the same section 

 to ascertain the influence of varying discharge. A series of tests for this 

 purpose was planned but was interrupted by adverse conditions. 



Observation No. 2. Louden Ditch 



The Louden ditch at this point is a wide, shallow canal with a clean, 

 sandy bottom entirely free from weeds or aquatic growth. The banks 

 while rough at the top are worn to the usual elliptical shape in the portion 

 of the cross-section regularly filled with water; the ditch on the whole 

 would be considered as being in fair condition. See Figs. 2 and 2a. 



Observation No. 3. Rist and Goss Ditch 



This ditch was the smallest on which readings were taken and was 

 also one of the best as regards general condition. Although a main 

 canal, it is scarcely larger than a lateral, averaging only five or six feet 

 in top width. It is built in heavy loam and the sides and bottom are 

 coated with sediment. There are no weeds which interfere with the 

 flow and there is no aquatic growth. 



Observation No. 4. Old Barnes Ditch at Lake Loveland Inlet 



The ditch at this point is in very good condition. It is constructed in 

 firm earth and the channel is well coated with sediment. There are no 

 stones or pebbles of consequence. The banks are smooth and regular. 

 Long grass overhangs the sides, but it does not hinder the flow of the 

 water. There is no aquatic growth. See Figs. 4 and 4a. 



Observation No. 5. Geo. Rist Ditch 



The readings on this ditch were taken about one half-mile below the 

 headgate. The ditch is built in coarse mesa material varying from 



