The Sayder syntheric unit hydrograph method is used for an ungaged watershed. The

watershed parameters are the following:

Watershed area $-20m{l}^2$

Stream length $=6\mathrm{.}1mi$

Length of channel $=4\mathrm{.}25ml$

$Cp=440$ and $C1=1\mathrm{.}88$

Show all equations and computations to determine:

A$)$ Sarder Standard Unit hydrograph

Lag time $=$

ir

Rainfall duration $=$

hr

Peak flow $=$

cfs

B$)$ If the real rainfall excess duration is $4$ hours find:

Adjusted lag time ${?}_{(})=$

ir

Peak discharge $=$

Peak flow $=$

hr

C$)$ For the $4-hr$ design event, the rainfall excess is $1\mathrm{.}5$ inches and base flow of $35$ cfs $,$

find:

Total peak flow of the watershed $=$

cfs