Head loss caused by an obstruction in the pipe having an area A and maximum area of obstruction as a is given by the expression:
1
\(\rm h_{obs}=\left[ \frac{A}{C_c(A-a)}-2 \right]^2 \times \frac{V^2}{2g}\)
2
\(\rm h_{obs}=\left[ \frac{A}{C_c(A-a)}-1 \right]^3 \times \frac{V^2}{2g}\)
3
\(\rm h_{obs}=\left[ \frac{A}{C_c(A-a)}-1 \right]^2 \times \frac{V^2}{g}\)
4
\(\rm h_{obs}=\left[ \frac{A}{C_c(A-a)}-1 \right]^2 \times \frac{V^2}{2g}\)