REMODELING OF EXISTING SPILLWAYS (PART 3)

REMODELING OF EXISTING SPILLWAYS (PART 3) By R.M.Khatsuria

Hydrotopics

Remodeling for ensuring structural safety

 

A necessity for remodeling to ensure structural safety may arise because

 

  • the dam is pretty old and turns out to be structurally unsafe according to present practice
  • increased inflow/outflow discharge requires a wider section of the spillway
  • additional loads are introduced following a major earthquake

 

In the above cases, hydrologic and hydraulic safety considerations are also involved together with structural safety that generally requires strengthening of the dam cross section with buttresses and other similar measures. However, for spillway, widening of the cross section is the only alternative available. In addition to ensuring a good bond between the old and the new construction, such a modification would have serious implications on the hydraulics of the spillway and energy dissipating arrangements. Figure 1 depicts a possible remodeling of an existing spillway by way of flattening of the rear slope for widening of…

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