Given:

• The lake level above the datum, H = 150 feet
• The stilling basin invert height above the datum, Z = 15 feet
• The channel width at all sections, w = 60 feet
• The discharge from the reservoir and over the spillway, Q = 15,000 ft3/s
• The energy loss between crest of the spillway and y1 location for all cases = 10 ft
  1. Part 1: The tailwater elevation so that the hydraulic jump will form in the stilling basin is 38.756 ft.
  2. Part 2: 12 concrete baffles will be placed in the stilling basin to lower the tailwater height requirements. Each baffle is 2.5 feet wide and 3 feet in height placed perpendicular to the flow. Assuming an effective coefficient of drag of 0.5 for the baffle blocks, based on the upstream velocity and combined frontal area of the blocks, determine the tailwater (TW) height requirements to form the hydraulic jump in the basin.
  3. Calculate the energy losses in the stilling basin with and without the baffles.
  4. Compare the difference between energy losses with tailwater differences. Any conclusion?

Answer rating: 100% (QA)

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