The plan requirements shall be:
(A) Elevation area capacity curves for the storage facility including notation of the storage volumes allocated to runoff, and permanent residual water storage for other uses (wet basins only);
(B) Inflow hydrographs (detention volumes for rational method) for the 15-, 25- and 100-year recurrence interval design storms;
(C) Stage-discharge rating curves for each spillway and for combined spillway discharges; and
(D) Routing curves for the 15-year and all greater criteria recurrence interval design storms with time plotted as the abscissa and the following plotted as ordinates (this item is not required for the rational method):
(1) Cumulative inflow volume;
(2) Cumulative discharge; and
(3) Stage elevation.
(1999 Code, § 34-5-65)