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Interlinking of River Basins in India - Alternative Layout

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Interlinking of River Basins in India - Alternative Layout Wshop Int. Riv. Bas. (Dec 2004), Jour. Engg. Geol. (ISEG), Vol. XXXI, No. 1-4, Dec 2004 Keynote A d d r ^ Interlinking of river basins in India - Alternative layout Harsh Gupta Abstract Interlinking of river basins in India, has been discussed over the years but could not be given a proper shape due to lack of financial resources, or lack of will for implementation. Basically three important alternative proposals w/ere considered- the Dastur's Plan, Dr. K.L.Rao’s Plan for linking of Ganga and Cauvery and a proposal of NWDA, for linking various river systems for irrigation. This paper, while dwelling upon these alternatives briefly, discusses the pros and cons with respect to topography, hydrology and geotechnlcal aspects. Transfer of very large amount of water from Ganga and Brahmputra by having major link canals would require consumption of Hydroelectric power for stage pumping from El. 250m to 500m. Through this paper, the author proposes a Mega Project, having major link canals from Ghaghra to Ganga, Ganga to Chambal, Brahmputra to Cauvery, and a Garland canal linking various parts of U.P., Bihar, West Bengal, Orissa, for irrigating central and southern parts of India. He also indicates possibilities of creating number of dams and reservoirs enroute so that additional storage capacity and hydroelectric potential could be generated from within the system, through a number of powerhouses located south of the Vindhyans, in order to compensate loss of stage uplifting of water at Rana-Pratap sagar and Gandhisagar Dams on river Chambal. An additional link from Ootacmund to Raichur is also proposed to augment supply to southern link canal from Pandurna to Dundigal. Introduction -NWG, by learned Dr. K.L.Rao, the then Chairman, CWPC (Rao, 1975) wherein the Interlinking of river basins in India, has idea limited to linking of Brahmputra and the remained an unresolved issue over decades Ganga with Cauvery, was mooted to provide either due to lack of financial resources or irrigable water to the water deficient regions lack of will for implementation; this issue has Southern India. Earlier to this, a scheme been debated upon in various fora and a was put forwarded by captain M.N. Dastur, number of approaches and schemes have airlines pilot that mainly comprised; been formulated from time to time. (s) ^200 Km long 300m wide Himalayan After its initial conception as visualized by Canal at el. between 457 m and 335m Sir. Arthur Cotton of the then British Rajya above MSL, aligned along the southern in India, primarily as a navigation scheme, slope of Himalayas running from Ravi the project was reconsidered in mid 'h the west and Brahmputra and seventies, under the National Water policy beyond in the east, with pondage created in the form of some 90 lakes. Director, Engineering Geology (NJP) 8th Floor, A Block, Vashundhara, Geological Sun/ey of India, Aliganj, Lucknow 226 024 (b) The southern and central region was 2. Godavari (Inchumpalli Low Dam)- covered by a garland canal which was Krishna (Nagarjunasagar Tail Pond) 9300 km in length 300m wide. These Link. two canal systems were suggested to 3. Godavari (Polavaram) - Krishna be connected at two points one near (Vijaywada) Link. Delhi the other near Patna. 4. Krishna (Almatti) -Pennar Link. Implementation of this Mega Project, ever- 5. Krishna (Srisailam) - Pennar Link. since, had remained in the mindset of our 6. Krishna (Nagarjunasagar) -Pennar National Water Development Agency under (Somasila) Link. whose direction the proposal of interlinking 7. Pennar (Somasila) -Cauvery (Grand of river basins is contemplated in India. anicut) Link. Various alternative schemes are under 8. Cauvery-(Kattalai)-Vagai-Gundar-Link. consideration of the NWDA, who is working 9. Ken -Betwa Link. with other nodal agencies like the Geological 10. Parbati-Kalsindhi -Chambal Link. Survey of India, etc. in carrying out different 11. Par-Tapi-Narmada Link. stages of feasibility studies. (Srivastava et. 12. Damanganga-Pinjal Link. al.,2002). 13. Bedthi-Vardha Link. Under the National Perspective Policy two 14. Netravati -Hemavati Link. main components viz. a) the Himalayan 15. Pamba-Achankovii Component with 19 links and b) a Peninsular Component with 17 links were defined. The NWDA in 1991-92 made headway when it Approach and Objective identified besides the above links, 49 diversion points and 55 storage reservoirs In the initial proposal the desired scheme after topographical studies. The details of was planned mainly for navigation but the link schemes are as under; subsequently under the Nation Water Policy, the main approach was diverted to provide a. Himalayan Development Component surplus water to deficient areas. 1. Brahmputra-Ganga Link (Manas- Transferring of about 1680 cumecs of this Sankosh-Tista-Ganga) Link. vital resource would require uplifting by 2. Kosi - Ghagra Link. pumping to the order of 50-550m in height, 3. Gandak -Ghagra Link. and would require a huge amount of energy 4. Ghagra - Yamuna Link. intake. The country’s power resources are 5. Sarda -Yamuna Link. already very less and the requirement will 6. Yamuna Rajasthan Link. increase manifold in the years to come. As 7. Chunar -Sone Barrage Link. such the power required for this project shall 8. Son Dam-Southern tributaries of Ganga have to be drawn from within the system. It link. would also be very important to harness the 9. Ganga -Damodar -Subernarehka Link. hydro potential thus generated within the 10. Subernrekha -Mahanadi Link. system is to be distributed as a regulated 11. Kosi-Machi Link. supply for irrigation besides power 12. Farakka. Bramputra - Ganga Link generation throughout the year. Hence, the (Jogigopa -Tista -Farakka Link) Mega Project shall have to be a multipurpose scheme, for navigation, to b. Peninsular River Development provide irrigation in water scarcity areas, Component power generation, flood control in surplus 1. Mahanadi (Manibhadra)-Godavari areas and also supply water for domestic & (Dowlaiswaram) Link. industrial needs. In order to fulfil the above objective our goal should therefore be; Geologically, the canal route from • Diversion of surplus discharge of Indo- Dibrugarh to Munger lies in the Quaternary Gangetic-Brahmputra basins into river sediments mainly comprising assorted basins of Maharastra, Gujarat, Andhra coarse sands, fine sands and silt occurring Karnataka and other states south of the as high level terrace deposits of the Vindhyans. Brahmputra and Ganga Plains. As one • Examine status of existing projects comes down towards the west the grain size • Review status of projects under reduces. In the Bihar Plains the ground construction water levels are shallow, as such, problems • Inter relationship with other projects, of slope failures in the soft unconsolidated highways, railways, etc. deposits and marshy ground conditions • Future planning; Review capacity, would be encountered during excavation of power generation, yield/ fetch and the canal. discharges, their distributaries Moreover, a Right Bank Canal linking systems, command areas of existing Ganga -Son, etc, off-taking from Kanpur or Irrigation and Power Projects and plan Patna at an elevation of 100 m+ would them as part of the Mega scheme, with considerably reduce the hydrological regime up-gradation and modifications. of the Indo-Gangetic system as the Ganga • Review possibilities of interlinking and its tributaries would have already been routes, reservoirs, diversion points and diverted to the western sector. Instead, it power generation points, etc. would be prudent to restrict the diversion of • Plan phasing out of the Mega Project Brahmputra for basinal transfer to Southern into executable smaller units. Sector at Munger, and cross it over Ganga, by constructing an aqueduct over Ganga (as All the above alternative proposals have discussed in suggested scheme, Fig.1). The their own benefits and limitations. It should layout would be more or less similar to that be our effort to foresee that an optimised proposed by NWDA, except that no water blueprint of this Mega Project is finalised from Ganga would be added to the lower after deliberations and thorough studies, canal system. A suitable bed gradient need taking all the pros and cons in the wider to be given to this East Coast Canal with perspective, before taking up the enroute augmentations from Mahanadi, components schemes, for feasibility studies Godavari, Krishna, Cauvery and other and execution, individually. rivers. Construction of a Himalayan Canal as Geologically, the southern banks of Ganga suggested by M.N. Dastur, would have been form terraces with assorted riverine a possibility in the pre-independence period. sediments and residual soils derived from Diversion of Brahmputra linked with Manas. the rock of Bundelkhand Granite, the Tista. Sankosh. and Gandak to the western Vindhyans, Gondwana and other Groups section (i.e. west of Delhi), may be a difficult and the pediplains of Mahanadi, Godavari proposition due to our territorial boundaries deltas, Krishna delta, etc. with Bhutan, Bangladesh, and Nepal. In the Western Sector, the diversion of Further, with a Diversion Structure surplus waters of Ghagra. Sarda. and somewhere near Dibrugarh (el. 150m) on the Ramganga rivers through a common canal, right bank of Brahmputra, a canal via could be diverted to Bhimgoda Headworks Dhekachuli, Jalpaiguri and Kishanganj etc., (existing) on Ganga and then transfer it to may be viable at El. 100m ± only, and unduly the Main Western Yamuna Canal and the extending it upto either Patna or Kanpur Main Link Cana! systems for transfer of (El. 138m) would not be economical. Ganga to Chambal, that could be planned as described in suggested Scheme at item elevations 250m to 306m and from 306m to B (Fig. 1c). This diversion canal linked with 507m in two stages, after suitable the Narwara Branch canal of Bhakra Main remodelling of additional capacity at Canal could be possible at an elevation of Gandhisagar, if finally found feasible. about El. +250m.
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