From Equation 4-24 



then 





Q.. = 



'^ 1+7 ' 



and 



%> Q-rt' ^lt> ^^^ %. ^°^ each reach are shown in Figure 4-50b. 



Now the after-inlet condition can be analyzed. 



Q„(I2) = 284,000 yd?/yr. (same as "before inlet") , 



%{2,3) = Q«(i,2) = 284,000 yd?/yr. (reach 2 is stable) . 



The gross transport rate across the inlet with the new y = 3.5 using 

 Equation 4-24, is: 



Qn(2.5)(l+T) 



%{2,3) = (284,000 yd?/yr.) f^J , 

 %{2,3) = 512,000 yd?/yr. . 

 The inlet sink (Qp = 15 percent of (^(2,3) 



Q~2 = 512,000 yd.Vyr. X 0.15 , 

 Q2 = 77,000 yd?/yr. 

 The erosion value from Reach 3 now becomes : 



Reach 3 erosion = spit accretion + inlet sink - net littoral drift 

 right of inlet. 



\3) «i3)) - %0,4) ^ ^2 - %i2,3) ' 



^(3) {^H3)) " 400,000 yd?/yr. + 77,000 yd?/yr. - 284,000 yd?/yr. , 



b(^) (q^(^^) = 193,000 yd?/yr. . 



4-138 



