354 



fry. SEDIMENTATION IN RESERVOIRS 



[Ch. 20 



from a boat suitable for carrying the equipment and operating person- 

 nel. 



The hydrographic party for reservoir-sedimentation investigations 

 consists of four to five men specially trained for their duties. These are 



Fig. 2. Echo sounder showing chart. 



a chief hydrographer, an instrumentman, a boat operator, a sounding- 

 recorder operator, and a distance-wheel operator. It is desirable for the 

 recorder operator or another man in the party to have some knowledge 

 of radio and electronic circuits. 



Other Equipment 



Equipment is designed to provide complete mobility and to permit 

 the entire outfit to move readily from a reservoir in one part of an 

 area to that in another area perhaps a hundred or more miles distant. 

 Automobile equipment consists of one sedan, a %-ton covered truck 

 with four-wheel drive, and a boat trailer. The boat that carries the 

 equipment is 20 feet long and has a beam of 5 feet and a draft of about 

 1 foot when loaded. (See Fig. 3.) The boat is especially fitted with 



