Do Problem $16\mathrm{.}18$ in the text on page $740.$ The IDF curve referenced in the problem $($Figure $16\mathrm{.}6$ in the text$)$ has been copied below.

Figure $16\mathrm{.}6$ Intensity$-$duration$-$frequency $($DF$)$ curves for Eridgewater, CT$.$

After identifying the design flow for each section $($that is$,12,23,$ and $34),$ design the storm sewer pipes if the value of Manning's $n=0\mathrm{.}016$ and the surface slopes provided below are applicable to the problem.

$\backslash$table$[[\backslash$table$[[$Pipe$],[$Section$]],\backslash$table$[[$Length$],[($ff$)]],\backslash$table$[[$Surface Slope$],[(\%)]]],[12,600,0\mathrm{.}5],[23,600,0\mathrm{.}25],[34,300,0\mathrm{.}02]]$

Assume that the following pipe sizes are standard and check to make sure that the sizes you select conform to minimum velocity and maximum diameter criteria. If you need to adjust the slope of the pipe to accommodate a given flow, identify the slope of the pipe that will be required. Your final answer for each pipe section should clearly identify:

Selected pipe diameter $($in$)$

Slope of pipe in ground $(\%)$

Velocity in pipe $($ft$/$s$)$ when full

Capacity of pipe $($cfs$)$ when running full $($this may be larger than the design capacity$)$

Std Pipe Sizes $($in$)$: $,6,8,10,12,15,18,21,24,27,30,33,36,42,48,54,60,66,72,84,96$

$16\mathrm{.}18$ A storm system consists of four areas with details as shown in Fig. P$16\mathrm{.}18.$ The direction of flow from each area and between the manholes is given by an arrow. Determine the $10-$year peak rate of flow for each sewer section by the rational method, assuming that Figure $16\mathrm{.}6$ reflects the intensity$-$duration$-$frequency relation for the area. The travel time between each manhole $=5$min.

Figure P$16\mathrm{.}18$

$\backslash$table$[[$Drainage Unit,Area $($acres$),$Cocfficient, $C,\backslash$table$[[$Overland llow time$],[($min$)]]],[$A$,5,0\mathrm{.}6,8\mathrm{.}0],[$B$,5\mathrm{.}4,0\mathrm{.}7,9\mathrm{.}2],[$C$,2\mathrm{.}5,0\mathrm{.}7,7\mathrm{.}0],[$D$,6\mathrm{.}5,0\mathrm{.}5,14\mathrm{.}5]]$