$8\mathrm{.}9\mathrm{.}1.$ In Example $8\mathrm{.}5,$ a culvert diameter of $1\mathrm{.}5$ m is required if this is the next largest standard size. As the design engineer, you would like to use a smaller culvert to save your client money. Would a $1\mathrm{.}25$ m diameter culvert meet the design requirements if:

a$.$ a well$-$rounded entrance was used along with increasing the pipe slope to $1\mathrm{.}0\%$ for the corrugated metal pipe?

b$.$ a concrete pipe was used without changing the slope or inlet condition?

The correct asnwer is:

a$.$ hL $=3\mathrm{.}10$ m$>2\mathrm{.}35$ m $($wont work$)$

b$.$ hL $=1\mathrm{.}98$ m$<mn>2</mn><mn>.</mn><mn>0</mn><mn>7</mn>$ m $($woll work$)$