The following data are given: vertical-walled reservoir, surface area = 1,000 acres; emergency spillway width = 97.1 ft (ideal spillway); H = water surface elevation (in ft) above the spillway crest; and initial inflow and outflow are both 100 cfs.
(a) In acre-ft and cfs-days, determine the values for reservoir storage S corresponding to the following values of H: 0, 0.5, 1, 1.5, 2, 3, and 4 ft.
(b) Determine the values of the emergency spillway Q corresponding to the depths named in part (a).
(c) Carefully plot and label the discharge–storage curve (cfs versus cfs-days) and the storage-indication curve (cfs versus cfs, Fig. 9.24) on rectangular coordinate graph paper.
(d) Determine the outflow rates over the spillway at the ends of successive days corresponding to the following inflow rates (instantaneous rates at the ends of successive days): 100, 400, 1200, 1500, 1100, 700. 400, 300, 200, 100, 100, and 100. Use a routing table similar to the one used in Example 9.10 and continue the routing procedure until the outflow drops below 10 cfs.
(e) Plot the inflow and outflow hydrographs on a single graph. Where should these curves cross?
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