DIKE AT FRONT 

 EDGE OF BENCH 



TA • TURNING AREA NOT LEVELED 

 B » LEVEL BENCHES 

 C « AREAS NOT LEVELED 

 7777m END DIKE (BROAD BASE) 



Figure 4.— Layout of level bench system without contributing area. 



.. DIKE AT FRONT TA = TURNING AREA NOT LEVELED 



EDGE OF BENCH B = LEVEL BENCHES 



CA= CONTRIBUTING AREA 



VZZZZ& END DIKE (BROAD BASE) 



Figure 5,— Layout of level bench system with contributing area. 



Construction Costs 



The principal factor affecting the costs of 

 construction is the total amount of earth to be 

 moved. The cost of moving a cubic yard of 

 earth will vary considerably from one bench 



construction job to another, and there seems 

 to be no standard set of coefficients for com- 

 puting costs for varying quantities of earth 

 moved (12, 13). Inquiries were made of sev- 

 eral persons familiar with earthmoving tech- 

 niques — including contractors, irrigation and 



8 



