In a wide stream, a suspended load sample taken at a height of

$0\mathrm{.}30$ m above the channel bed indicated a concentration of

$300$ ppm of sediment by weight. The stream has a bed slope of $1$

in $5000.$ Calculate the concentration of the suspended load at

$1\mathrm{.}30$ m above the channel bed. Take Hydraulic radius R$\text{'}=3m,$

fall velocity $=0\mathrm{.}03\frac{m}{s},$ depth $=4m$ and Von karman constant $=$

$0\mathrm{.}4$