Task $1(15\%)$:

Design a GRP pipe to drain the major road shown in Figure $1.$ Assume a design discharge of $775\frac{L}{s}$ and a

longitudinal slope of $1\mathrm{.}4\%.$ How much is the $($discharge$)$ capacity of the pipe? What percentage of pipe's

capacity is used? What should be the selected design AEP?

Assume the available pipe sizes and maximum velocity are the same as concrete ones.

Task $2(15\%)$:

Design a non$-$vegetated earthen rectangular channel for the above task using the same information. Discuss

the pros and cons of channel and pipe and draw their cross sections.