$1.$ Determining GW recharge from baseflow $($Meyboom Method$)$

Problem $1$a$.$

Determine the amount of ground$-$water recharge that takes place from the end of the base recession of runoff year $1$ to the start of the baseow recession of runoff year $2.$ The value of Q$0$ for the first recession is $760$m$3/$s and it takes $6\mathrm{.}3$ months$($mo$)$ for the discharge to reach $0\mathrm{.}1$Q$0$ :

Compute the volume of annual recharge that occur between runoff year $1$ and runoff year$2.$

Problem $1$b$.$Semilogarithmic stream hydrograph showing baseflow recessions.

Analysis of baseflow recession curves from a drainage basin has yielded a recession constant $1\mathrm{.}55$x$10-2/$day when discharge is in ft$3/$sec and time is in days.

$1.$ If a recession begins with a discharge of $328$ ft$3/$s and t is in days, what will be the flow after $35$ d and $70$ d$?$

$2.$ If the recession begins with a discharge of $2356$ ft$3/$s$,$ what would be the flow in $5$d$?$

Problem $1$c$.$

The flow of a river at the start of a baseflow recession was $712$ m$3/$s; after $60$ day the flow declined to $523$ m$3/$s$.$

$1.$ What is the recession constant?

$2.$ What would be the flow after $112$ day?

Problem $1$d$.$

This figure is the hydrograph of a river with a long summer baseflow recession. Compute the volume of annual recharge that occur between runoff year $1$ and runoff year $2.$