Tuesday,
April 1, 2003, Chandigarh, India
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Admn clarifies on Sukhna water level Chandigarh, March 31 In a statement issued here today, Mr Krishanjit Singh, Superintending Engineer, Construction Circle-II, said the fear expressed by Dr Dhillon was “totally wrong and unfounded.” It was proposed to raise the sill level by two feet from the maximum pond level of 1161 feet (and three feet from the maximum flood level of 1160 feet). Detailed technical examination had been underway in the department for the past six months, various alternatives and its impact had been studied in depth. Since the department did not possess the requisite expertise to handle such hydel problems, first the BBMB authorities were consulted and a number of meetings were held with Mr D. S. Notra, Chief Engineer, BBMB, and efforts were made to find the old design and the drawings. Only one old drawing of profile of the existing spillway structure could be traced. However, the structure design could not be traced. The design wing of the National Hydel Power Corporation (NHPC) was also contacted. Mr A. K. Sachdeva, Executive Director, NHPC, has suggested that the department should contact Mr M.P. Jain, a former Director, Hydel Designs, Punjab Irrigation Department, who had been heading hydel design organisation. After detailed discussion with him, the work for necessary modifications of the existing structure was assigned to him. It was found that keeping all the factors in view, it will be possible to raise the water level only by two feet. Pros and cons of various alternatives such as raising the height of the gate with its lifting mechanism, raising the sill level of the regulator along with the modification in civil structure and introduction of breast wall at the top near the gates were studied. Of these three alternatives, raising of sill level by two feet without any modification of the gates was found to be most economical and effective. Therefore, it was decided to raise the sill level of the regulator and make corresponding changes in the civil structure after detailed discussions. The lifting of the crest of the regulator by two feet from the maximum pond level did not alter any forces on the gates, piers and abutments. The raised water level did necessitate the changes in design of glacis, cistern, energy dissipating devices and downstream protection works. These changes were carried out after detailed studies as per standard engineering practices for such type of structures which included checking the adequacy of water way, length of impervious floor with respect to exit gradient, depth of upstream and downstream cut of walls against scour length and level of stilling basin with respect to hydraulic jump, uplift pressure, energy dissipation required, protection work on upstream and downstream of the regulator. Based on these detailed studies, the required remedial measures had been proposed to be carried out. These measures were sufficient for the safety of the structure against any type of failure. The apprehension of Dr Dhillon that masonry wall (piers and abutments) of spillway would not be able to withstand the additional pressure of water head was incorrect because there was no increase in pressure on the gates or masonry walls after raising of sill level. The earthen dam with stone pitching on the lake side had also been checked and found to be strong enough for this additional level of water. |
Weak trees to be pruned Chandigarh, March 31 He said, “These trees have become potential threat to the children and also to residents nearby as these could fall in the prevailing strong winds”. Mr D.S. Mangat, DPI (Schools), has taken a note of this problem and requested the Engineering Department to prune these trees, he added. |
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