DESIGN ANALYSIS OF DIVERSION HEADWORKS FOR WATER INTAKE OF HFCL PLANT AT NAMRUP

Abstract

Quite often, revamping of a large scale industrial unit require upgrading the input parameters of the manufacturing processes. One such real life example happens to be the proposed revamping of public sector HFCL plant at Namrup in Assam, which requires an important input of 2 cumecs of assured and uninterrupted water throughout the year from the river Disang—a gravel/boulder stage river. The fluvial characteristic of gravel bed rivers quite significantly differ from that of sand-bed rivers in many aspects such as sediment size, sediment transport, unpredictable geological features that may be encountered under river bed and sides, variedly changing flow etc. has been made in this dissertation to analyze the design aspects for suitable diversion head works. The report includes an in depth design analysis of various alternatives of diversion head works on the bouldery bed Disang river a tributary of Bramaputra river originating from the Nagaland hills, for suitable safe river diversion structures. The following three alternative varieties along with cost comparison was under taken namely, a fully gated low-crest barrage with mass cement concrete body material. 2. an ungated high-crested over flow weir at pond level with a two-gated under sluices with mass cement concrete body material. 3. same hydraulic features as at sl. no. (ii) above, but with R.R. masonry works....