A field survey yielded the channel cross$-$section data below. Calculate

the cross$-$section area of the active channel $($i$.$e$.,$ the part that has water

flowing$)$ and determine the discharge rate. Assume the average velocity

in the channel is $2\mathrm{.}1$ ft$/$s$.$

Red Butte Creek, Sunnyside Park Cross$-$section $3$

Station $($ft$)$ Elevation $($ft$)$ Notes

$04678\mathrm{.}45$ LB

$2\mathrm{.}24676\mathrm{.}85$

$3\mathrm{.}24676\mathrm{.}1$ WS

$5\mathrm{.}24675\mathrm{.}45$

$8\mathrm{.}44675$ TW

$12\mathrm{.}64675\mathrm{.}65$

$13\mathrm{.}24676\mathrm{.}1$ WS

$14\mathrm{.}34676\mathrm{.}45$

$20\mathrm{.}64678\mathrm{.}45$ RB

LB$=$ Left bank

WS$=$ Water surface

TW$=$ Thalweg

RB $=$ Right bank