Use the hydrograph and cross-section in Problem 6.4 for a dam break analysis. Divide the r...

Use the hydrograph and cross-section in Problem 6.4 for a dam break analysis. Divide the routing reach into three segments, each 1,524 m (5,000 ft) long using the same cross-section (natural conditions) for each segment. The dam is to be located at the down­stream end of channel 2 (IBSEG = 2). The initial water surface elevation in the reser­voir (WSELD) is 330.0 m (1,082.4 ft), initial breach width (BWDI) is 10.0 m (32.8 ft), final breach width (BWDF) is 40.0 m (132.2 ft), final breach elevation (BELF) is 305.0 m (1,000 ft), side slopes of the breach (SSB) are 0.5, start time of the breach (BTST) is 2.0 hrs, and time for the breach to develop (BTDR) is 6.0 hrs. The cross-sections above the dam are to be modified to represent the reservoir as follows:

Problem 6.4

The following cross-section is representative of a channel routing reach 4,573 m (15,000 ft) long. Estimate the relation between storage and discharge using the stan­dard step water surface profile computations for a range in discharge rates.

The Manning "n" values and channel slope listed below indicate the degree of chan­nel improvements.

Route the following hydrograph (tabulated at 1-hr intervals) through the routing reach for the natural, improved, and fully developed channel using the storage routing procedure.