For the elevation, storage and outflow data shown below create the associated $2\frac{S}{}t+O$ chart. Plot the chart using $2\frac{S}{}t+O$ as the ordinate, and $O$ as the abscissa$.($This was also called the storage indication chart.$)$ Use a routing interval of $0\mathrm{.}2$ hours.

Route the following hydrograph through the above retention pond. Use a routing interval of $0\mathrm{.}2$ hours.