$A_1{V}_1=A_2{V}_2$

A rectangular pipe with a cross section of $1ft.2ft.$ is flowing full at a $4$ CFS velocity of $2$ feet per second $($FPS$).$ What is the flow in CFS$?$ in GPM$?(1800$ gpm$)$

A $24$ inch diameter pipe is flowing full at $2$ FPS$.$ What is its flow in CFS$?$

$(6\mathrm{.}28$ CFS$)$

What is the vel. in FPS of a $48$ inch dia. pipe flowing full at $12,500$ GPM$?$

$(2\mathrm{.}22$ FPS$)$

Compute the flow in GPM in a ${42}^{?}$ dia. pipe flowing at a vel. of $3\mathrm{.}5$ FPS$?$

$(15,100gpm)$