Dam Break Analysis for Vaigai Dam
Name of Institution : Institute of Hydrology and Hydraulics, Poondi

Name of P.I. : Er. R. Srinivasan

Duration & date of start : 2 Years, 12.3.1993

Date of Completion : Completed in December 1997.

Abstract of findings:

    Calculation of probable maximum flood (PMF) and floods of various frequencies such as 100, 200, 500 and 1000 years for Vaigai Dam.

    Analysis of flood elevation for floods of various frequencies including PFM and for various dam break models including overtopping using MIKE-11, in the downstream of Vaigai Dam upto Madurai town.

    Preparation of flood zone map for river reaches providing boundaries of inundated areas for various floods.

    Ascertaining the probable damages that will be caused in those reaches due to flood waves for worst hypothetical dam break modes.

    Typical specific study for damages to Madurai town under assumed hypothetical dam break.

What value addition the scheme has made into the existing state of art:

    It is very useful study for Dam break analysis.

How the result can be put to use

   Dam Break Analysis for Vaigai dam is the maiden attempt in Tamilnadu. Flood zone maps due to hypothetical dam break are prepared in five reaches upto Madurai Town (72.50 km.) These maps can be utilised to forewarn the people living in the flood zone. Further settlements and important installation inside the flood zone can be discouraged by education or by legislation.

    The Probable Maximum Precipitation and Probable Maximum Flood calculated can be utilised to design irrigation structure across Vaigai river. .

What action has been taken so far in this regard

    The Govt. of Tamilnadu has been requested to get similar studies conducted for other structures also.

What action is further required

   MOWR may sponsor a study to evaluate the feasibility of present approach in comparison to river methods.

What efforts have been made for the dissemination of research findings

   Engineers of Tamilnadu Irrigation Deptt. have been trained. As the study was conducted by field engineers, no papers were published.