XCIX 



The "overflow" may be omitted, if desired, as the 

 "flume" can be readily adapted to the jjiirposes of car- 

 rying ofl" any surx)lns water. As the flume, however, 

 requires constant attention to insure its operation, the 

 "overflow" should be retained, if practicable, in which 

 event it is of even greater importance than in the case of 

 the x)onds already described that it should be placed in 

 firm ground. 



The accomx)anying diagrams represent a vertical sec- 

 tion, and corresponding horizontal x)rojection of the 

 embankment, /i— showing the position of tlie flume, F^ 

 and its controlling valves, d, d; i ogether with that of 

 the crib- work. "T/, O, C," which is constructed on the 

 pond side, and is designed to support the screens em- 

 ployed to ])revent the escape of the Carp and the ingress 

 of otlier flsh. 



The flume is phxced, as before, on a level with the bot- 



