Flood & Erosion Control & Irrigation Programmes in the North Eastern
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FLOOD & EROSION CONTROL & IRRIGATION PROGRAMMES IN THE NORTH EASTERN REGION 3rd Sectoral Summit of North Eastern Council (11.03.2007) Ministry of Water Resources 1 LAND & WATER RESOURCES NE REGION WATER AVAILABILITY • All India 1869.00 BCM • Brahmaputra & Barak Basin 586.00 BCM • Geographical area of NER 26.13 M ha • Cultivable area 6.31 M ha • Ultimate Irrigation Potential of NER 4.32 M ha (MMI & Minor Irrigation) • Irrigation Potential created in NER 1.44 M ha (MMI & Minor Irrigation) (TILL MARCH,2004) 2 1 A. FLOODS & EROSION CONTROL FLOOD SCENARIO • The topographical and the geographical location of North East Region is unique with the hydro-meteorological situation making it one of the highest rainfall zone in the World. • The main rivers causing floods in the North-east region are the Brahmaputra, Barak and their tributaries. • Flood - Main causes: – High Flows – Inundation – Drainage congestion – Bank erosion • Floods in Assam are caused mainly due to narrowness of the valley, high rainfall in the catchment, unstable steep slopes, long monsoon period etc 3 FLOOD PRONE AREAS IN N-E REGION 4 2 Flood prone area of N-E States Sl. State Geographical Flood prone Flood prone No. area(mha) area (mha)( As area (mha) (As assessed by reported by RBA) State Government) 1 Arunachal Pradesh 8.37 - 0.12 2 Assam 7.85 3.15 3.82 3 Manipur 2.24 0.08 0.08 4 Meghalaya 2.24 0.02 0.10 5 Mizoram 2.11 - 0.05 6 Nagaland 1.66 - 0.01 7 Tripura 1.05 0.33 0.33 8 Sikkim 0.71 - 0.0 Total 26.23 3.58 4.53 5 BROAD STRATEGY FOR FLOOD & EROSION MANAGEMENT • Absolute flood control and protection not feasible; reasonable degree of protection from flood losses at economic costs necessary • A combination of structural and non-structural measures in a phased manner is the most accepted strategy for flood management • A comprehensive approach towards management of flood 6 3 Broad Functions of CWC in NE Region • Flood Forecasting and Warning system • Maintains Hydro Meteorological stations • Undertakes surveys and investigation • Monitoring of Irrigation projects • Techno economical appraisal of irrigation & flood management schemes • Technical Advice to N-E States & others regarding flood and erosion problems. 7 Flood Forecasting & Warning System Flood Forecasting(FF) & Warning System plays a significant role in reducing the loss of life and movable property during floods. CWC have a National Network of 26 FF Stations in NE Region. Forecasts are formulated using 0800 hrs/ 0900 hrs water level data and issued at 1000 hrs with advance warning time ranging from 6 hrs to 36 hrs in NER during flood season. 8 4 MAP OF NORTH EASTERN REGION 9 ara hy MAP OF us K TRIPURA ASSAM 22 H a S n E h D D h a g M l e a A i a M n L u G N A MIZORAM B G u m ti LEGEND 23 F F STATIONS FLOOD AFFECTED AREA 10 5 FF Stations of CWC Sl.No River Site State 1 Brahmaputra Dibrugarh Assam 2 Brahmaputra Neamatighat Assam 3 Brahmaputra Tezpur Assam 4 Brahmaputra Guwahati Assam 5 Brahmaputra Goalpara Assam 6 Brahmaputra Dhubri Assam 7 Burhidihing Naharkatia Assam 8 Burhidihing Chenimari(Khowang) Assam 9 Subansiri Badatighat Assam 10 Dikhow Shivsagar Assam 11 Desang Nanglamoraghat Assam 12 Dhansiri (S) Golaghat Assam 13 Dhansiri (S) Numaligarh Assam 11 FF Stations of CWC(Contd…) Sl.No River Site State 14 Kopilli Kampur Assam 15 Kopilli Dharmatul Assam 16 Jiabharali Jiabharali(NTX) Assam 17 Puthimari Puthimari (NTX) Assam 18 Pagladiya Pagladia(NTX) Assam 19 Barak APGhat Assam 20 Katakhal Matizuri Assam 21 Kushiyara Karimganj Assam 22 Manu Kailashar Tripura 23 Gumti Sonamura Tripura 24 Beki Beki NHX Assam 25 Manas Manas NHX Assam 26 Sankosh Golakganj Assam 12 6 FF Network Modernisation Flood forecasting network in NE region is to be modernised by using state of art technology Data Collection: Automatic Sensors Data Transmission: Automatic Data Transmission Technique e.g. Satellite, VSAT, Internet/Email, Mobile Phones etc Forecast Formulation: Computer Based Comprehensive Catchment Models. Forecast Dissemination: Computer Network and Satellite, Internet, E-mail etc. 13 Hydro Meteorological Observations Hydrological data of river basin is a pre-requisite for an accurate assessment of Water Resources, Planning optimum utilization for comprehensive development and flood management. CWC operates 133 hydro meteorological observation sites (State wise) in NE Region Sl. No. State No. of sites 1. Arunachal Pradesh 21 2. Assam 69 3. Manipur 1 4. Meghalaya 7 5. Mizoram 6 6. Nagaland 0 7. Sikkim 16 8. Tripura 13 Total 133 14 7 Preparing DPRs for Development in NE Region CWC undertakes surveys and investigation to prepare DPRs for development of power generation, irrigation, flood management and water supply. Number of projects investigated =39 Expected power potential =2,934 MW Expected Irrigation potential =324 Th.ha Number of projects under investigation =10 15 Monitoring of Water Resources projects CWC carries out monitoring of major and medium irrigation projects to ensure the achievement of physical and financial targets of creatcreationion of irrigation potential. Sl. State No. of Target Potential CLA/ Grant No. projects potential created up to released up monitored under AIBP March, 2006 to 16-2-2007 (Thousand (Thousand (Rs. in crore) hectare hectare) 1. Assam 11 163.51 69.26 110.72 2. Manipur 3 51.95 0.00 242.85 3. Meghalaya 1 4.78 0.00 4.00 4. Tripura 3 22.25 6.70 49.82 16 8 Techno economic appraisal of flood management schemes CWC carries out techno economic appraisal of flood management schemes for TAC of the Ministry of Water Resources. S.No. STATE No. of scheme cleared No. of scheme on from CWC which comments sent 1 Assam 31 22 2 Arunachal Pradesh 2 4 3 Manipur 6 0 4 Meghalaya 0 0 5 Mizoram 2 0 6 Nagaland 6 0 7 Sikkim 1 0 8 Tripura 1 0 Total 49 26 Brahmaputra Board 10 9 17 BRAHMAPUTRA BOARD Functions – Survey, investigation and preparation of Master Plans – Preparation of Detailed Project Reports for identified schemes in water resources projects and drainage development schemes – Construction of Multipurpose Dams and other works in North-East as approved by Central Government 18 9 BRAHMAPUTRA BOARD Completed Works (A) Survey, Investigation & Master Plans • Prepared 36 Master Plans for Brahmaputra, Barak & some of their tributaries. • Major recommendations in Master plans – Long term measures ¾Construction of storage reservoir ¾Watershed management ¾Flood forecasting – Short term measures ¾Embankment construction and improvement ¾Anti Erosion (AE) works ¾Drainage improvement 19 LOCATIONS OF MULTI-PURPOSE PROJECTS 20 10 Major Dams Proposed in Master Plans – Siang Dam (Siang/ Brahamaputra) – Subansiri Dam (Subansiri) – Dibang Dam (Dibang) – Lohit Dam (Lohit) – Tipaimukh Dam (Barak) – Pagladiya Dam (Pagladiya) – Manas & Sankosh Dams in Bhutan (Manas & Sankosh) 21 (A) Survey, Investigation &Master Plans (Contd.) DPRs for 5 Multi-purpose projects completed Siang & Subansiri Projects ¾ DPRs of Single high dams with flood moderation as one of the purposes for each of Siang and Subansari rivers was prepared. ¾ In view of submergence of major towns, Brahmaputra Board decided in favour of cascade development of 3 projects of lesser heights each as Upper, Middle and Lower for each Siang and Subansari rivers. ¾ After initial investigations by Brahmputra Board, the projects on cascade development were handed over to NHPC 22 11 Tipaimukh Dam •The DPR was completed by Brahmputra Board & project handed over to NEEPCO for contruction Pagladiya Dam •DPR completed, execution taken up by Brhamputra Board. •Construction could not start due to non completion of land acquisition and zirat survey by Govt. of Assam Bairabi Dam •DPR completd and project handed over to Mizoram government for construction. 23 (A) Survey, Investigation &Master Plans (Contd.) • Works of DPR of Dibang project partly completed and handed over to NHPC. • DPRs for 11 Drainage Development Schemes. 24 12 COMPLETED WORKS Contd…. (B) Execution of Identified Projects (from 1999-2000) (Central Sector) Anti-erosion & Flood Control projects (3 nos.) • Avulsion of River Brahmaputra at Dholla-Hatighuli Phase-I (for diversion of Debang River to its original course): Completed 2004-05 (Rs.10.47 crore) • Avulsion of River Brahmaputra at Dholla-Hatighuli Phase-II (for diversion of Lohit to its original course): Completed 2004-05 (Rs.4.95 crore) • Protection of Majuli Island from flood & erosion (Immediate Measures): Completed 2004-05 (Rs.5.92 crore) 25 SATELLITE PLANFORM SHOWING RIVER AVULSION & SHIFTING PROCESS AT CONFLUENCE ZONE OF MAINSTREAMS OF THE BRAHMAPUTRA NEAR SADIYA (TINSUKIA) Dehang Dibang Dibang Dehang Lohit Lohit SATELLITE IMAGERY OF SATELLITE IMAGERY OF YEAR 1990 YEAR 2002 26 13 INDEX MAP SHOWING AVULSION OF RIVER BRAHMAPUTRA AT DHOLA-HATIGHULI 27 TIE BUND PITCHING WITH SAND FILLING BAG AND BAMBOO CRIPS 28 14 SILTING NEAR RCC PORCUPINE AT DHOLA HATIGHULI 29 BRAHMAPUTRA BOARD ONGOING WORKS (A) Survey, Investigation &Master Plans Survey & investigation and preparation of 15 nos. Master Plans DPR for multi-purpose projects 8 nos. DPR for Drainage Development Schemes 22 nos. 30 15 ONGOING WORKS (B) Execution of identified projects (Central Sector) (i) Drainage 9 Harang, Barbhag, Amjur, Jengrai, Development nos. Jakaichuk, East of Barpeta, Schemes Joysagar, & Singla in Assam and Kailashahar in Tripura (ii) Multi-purpose 1 no. Pagladiya Dam Project Project (iii)Other Anti- 2 Protection of Majuli Island from erosion & nos. flood and erosion Phase-I Flood Control (Assam) Projects & Anti-erosion measures to protect Kushiabil & Durgajan village at Dimapur from River Dhansiri – South (Nagaland) 31 PAGLADIYA DAM PROJECT • Sanctioned in January 2001 for Rs. 542.90 crore (1999 price level) • Preparatory works of tender drawing and document, project site, colony roads etc. carried out • Project works held up due to resistance by Project Affected People (PAP) in Bodoland Territorial Autonomous Districts to Zirat Survey (property assessment) of PAP • Bodoland Territorial Council (BTC) have now intimated (Dec.