Designs Changes by CWC of Polavaram Head Works

New Delhi : Union Minister for Jal Shakti, Gajendra Singh Shekhawat   in a written  reply in Rajya Sabha  today. said that Implementation of Polavaram Irrigation Project, including the planning and design of its various components, is being done by the Government of Andhra Pradesh (GoAP). However, approval/ vetting of the designs is being done by Central Water Commission (CWC), to reaffirm their conformity with the relevant codal provisions, as well as with the provisions of Godavari Water Dispute Tribunal Award, 1980.

As informed by GoAP, vetting by CWC has led to changes in design of some components of the project, including height of the upstream and downstream coffer dams, depth of foundations, grades of concrete of spillway in deep blocks, diaphragm wall cutoff for the left side of upstream coffer Dam, chipping in gate grooves, stop log gates grooves, second stage concreting in spillway, etc.

As further informed by GoAP, details of necessary additional works emerging as per the recommendations of the Dam Design Review Panel and as approved by the CWC, are as follows:

 

 

S No. Component Original Design/ Scope of work Revised Design
1. Gap-I Earth Dam Earth cum Rockfill Dam with D wall type cutoff and ground improvement work with vibro stone columns and Deep soil mixing.
2. Gap-III Earth dam Concrete Dam
3. Spill Channel End Cutoff Z- sheet pile Reinforcement Cement Concrete Diaphragm wall
4. Gap-II Ground improvement works Sand replacement (clay removal) Vibro stone columns and Deep soil mixing.
5. Slope protection works for Spillway and Spill Channel No provision available Cut slopes with rock bolting, Shotcreting etc.

 

 

 

Government of India is providing 100% reimbursement of the remaining cost of the irrigation component of the project for the period starting from 01.04.2014, to the extent of the cost of the irrigation component on that date.

GoAP has confirmed the same.