A $10$ km$2$ watershed within the Azraq basin of soil group D of this area $8$ km$2$

of

hydrologic poor natural range land, $1$km$2$

of hydrologic poor woods and $1$ km$2$

of dirt

roads. Knowing that the major stream length is $10$ km and the land slope is $3\%$ and the

length along the main stream to a point nearest the watershed centroid is $8$ km$.$ A $1-$hrs

storm on the watershed produced the following hydrograph $($The baseflow $=100$

m$3$

$/$s$)$: