Baseline 



20 



10 - 



^ - 



-20 - 



Survey I ( I Jun '70) 

 Area A A' BC 



Survey 2 { 5 Sep 70) 

 Area AA'b'C 



50 



100 150 200 250 300 350 



Distance Along Profile from Baseline 



LmA (lft,)(5265ft.2) 



Unit Volume for Survey I = V,, = -i^*— = —. = l95Cu.Yd. 



^ 27 27ft.ryd. 



L A ( I f t ) ( 4955ft ^ ) 



Unit Volume for Survey 2 = V„ = -^^— '■ —. '■ — = 184 Cu.Yd. 



27 27ft7yd. 



400 



Change in Unit Volume = AV^^ 184-195= -IICu. Yd. 



AVu (365) ( 184 yd^ - I95yd3 ) (365 days) 



Annual Rate - = = 



( tg-t,) ( 5Sep'70- I Jun'70) 



(96days) 



42 Cu.Yd. 



Figure 10. Example of profiles and volumetric change computation. 



20 



