Q$1.$ There is a proposal for a development plan over a $10Ha$ land having $5\%$ slope, comprising sandy soil.

The site is within the City centre and the surface runoff drains to the public sewer.

Rules and regulations of the City dictates any development plan CAN NOT EXCEED $80\%$ of the overall

land area.

The plan is to construct sports centre consisting several facilities with $30,000m2$ closed area covered

with roofs and the remaining permissible area will be covered with compacted gravel to be used as

carparks, driveways and walks.

Regional Meteorology Department statistics indicate total annual rainfall intensity of $1200mm.$

a$.$ Calculate the existing greenfield peak surface runoff to the sewer in $1\frac{t}{s}.$

b$.$ Calculate the possible peak discharge in $1\frac{t}{s}$ to be drained into the sewer after completion of the

development plan. Ignore about the flow time delay within the field.

c$.$ If an idea is to benefit from the rainwater harvesting for the roofed areas, calculate the size of a tank

in $m^3.$ to store rainwater for a storm that lasts $10$ hours.Solve Step by step for an upvote!