REMODELING OF EXISTING SPILLWAYS (PART 3)


Pratik Solanki:

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

Originally posted on 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…

View original 502 more words

REMODELING OF EXISTING SPILLWAYS (Part 2)


Pratik Solanki:

REMODELING OF EXISTING SPILLWAYS (Part 2) BY R.M.Khatsuria

Originally posted on Hydrotopics:

 

(For similar topics refer http://hydrotopics.wordpress.com)

 

R.M.Khatsuria

(email: rmkhatsuria@rediffmail.com

 

 

 (Want to refer Part 1?)

Remodeling for the purpose of increasing the storage of the reservoir involves raising of the reservoir level above the normal operating level and this would result in additional submergence of land in the upstream. In the case of ungated spillways, the normal operating level is at the crest level and there always is a temporary submergence caused by the overflow depth during the passage of floods. Thus, the full reservoir level (FRL) can be raised up to the maximum depth of overflow corresponding to the allowable limit of the upstream submergence. However, with the gated spillways, the FRL is required to be raised, which brings additional area under the submergence, beyond that corresponding to the original FRL. Thus, the remodeling is to be accomplished under the above mentioned pre-requisites.

When…

View original 767 more words