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Presentation on theme: "ASSAM AGRICULTURAL COMPETITIVENESS PROJECT- Additional Financing"— Presentation transcript:

Groundwater Monitoring System

2 Background - rationale for this system
Abundance rainfall during monsoon (ranging from mm), yet farmers are unable to maximize income, as they lack access to water during winter months World Bank financed ARIASP & AACP provided irrigation pumps for shallow tube wells (STW) to farmer groups, for tapping high watertable & abundant groundwater in Assam Installation of STW needs to be done considering balance between recharge potential & potential discharge to meet crop demand, water logging mitigation measures, so as to protect existing investment in STWs Increasing number of installed STWs, therefore warranted monitoring to avoid over exploitation of groundwater for ensuring its sustainable use

3 NERIWALM study of 2004 …. Key findings
NERIWALM: North Eastern Regional Institute of Water and Land Management

4 NERIWALM study of 2011 …. Key finding
DISTRICT WISE SAFE YIELD OF GROUND WATER FOR 6 MAJOR DISTRICTS WHERE 80% STWS ARE INSTALLED District Area of District Normal rainfall Total rainfall recharge Annual groundwater availability Safe yield of ground water No of STW's that can be installed Category Ha mm Ha-m Nos. Barpeta 232077 2097 83233 79792 51066 17022 Safe Bongaigaon 111242 2300 45715 51839 26461 8820 Semi-Critical Dhubri 239962 2762 77258 92709 27001 9000 Critical Goalpara 200309 2374 89302 81915 40067 13356 safe Kamrup (R) 307375 1871 86657 88545 40874 13625 Kamrup (M) 98072 1800 17594 12690 9242 3081 Nalbari 98013 2772 35583 38035 25842 8614 Total 435343 445525 220553 73518 The number of STWs to installed per district under AACP and other schemes is determined based on these two Studies done under AACP

5 Objective of Establishing GWM System
AACP-AF aims to establish a comprehensive groundwater monitoring system to support Agriculture Department in- Taking strategic decision on future investments on STW programs, water recharge structures, etc Planning density of STW with respect to hydro-geological regions Planning agriculture based interventions to manage water demand leading to sustainable use of resources Water level & quality monitoring stations Include installation of piezometers, telemetric digital water level recorders (DWLR) and water quality sensors (at selected locations) coupled with stations. Telemetric system for automatic monitoring at required frequency

Team of officials from PCU and Agriculture Engineering Dept. led by SPD had visited HP and Punjab to have first- hand exposure of Groundwater monitoring system established under Bank financed HP-II

7 VISIT TO HP & Punjab: experience gained
Bore-well locations: based on grid maps Network of Bore-wells: equipped with DWLRs and telemetry systems For groundwater data collection & uploading to a central Server system in real time Measurement Frequency: Should be adequate to detect short-term & seasonal groundwater fluctuation Should be able to discriminate effects of short- term and long-term hydrologic stresses Shallow aquifers frequent measurements, while deep confined aquifers need less. Measurement Frequency should link to withdrawal of GW

To address manpower constraint in Agriculture Dept. -telemetric system of Piezometer should be installed Location of Piezometers must be in public places such as Block Office, Govt. owned premises for safety Piezometer Diameter should be atleast in 6” (150 mm) Boreholes should be protected with RCC box on top Adequate protection measure for Piezometer necessary

GW Monitoring Cell established-Nodal Officer in place Prepared 15x15 Km Grid map of Assam and also for each districts: All except two Hill districts covered (25 districts) Finalized total number Piezometer based on grid map: 250 Areas near river basins excluded Exact location of Piezometer being finalized – would be completed before award of contract for civil work Collaboration with CGWB for Technical Advice/Support Time frame: Complete Civil Work: within 6 months; by Sep. 2013 Procurement Telemetric DWLR, through ICB: Sep. 2013 Commissioning of the GW system: Oct. 2013

Process for hiring experts for GWM Cell such as Hydro- Geologists, Chemists, GIS expert, computer operators, etc. for GWM cell is ongoing- TORs being drafted Existing district level engineers, would be given additional responsibility to look after GWM stations. Identified engineers would be trained GWM Cell would also have responsibility of monitoring GW quality, regarding presence of any hazardous elements Automatic Weather Station (AWS) will also be installed for each block in the State Telemetric-GSM system would be web enabled, with open data sharing principle, online data back-up arrangement


12 Groundwater Monitoring Well Design .. Key elements
Diameter of the bore hole-150 mm Depth of bore-hole-Standard 30 meter Lockable steel cover to be fitted & secured in concrete box seal, to protect bore-wells Vent hole near top of protective casing to prevent explosive gas build-up & to allow water levels to respond naturally to barometric pressure changes Drain hole at base of protective casing to prevent water build-up. Concrete box seal to extend below frost depth Bore-holes would be placed at an elevated area to avoid flooding

Sl. District No.of Piezometer Bore hole Approx. value of work (Rs. Lakhs) Completion Period SCHEDULE-A SCHEDULE-C 1 Baska 10 69.56 180 16 Nagaon 15 2 Nalbari 6 17 Morigaon 9 3 Barpata 18 Golaghat 4 Goalpara 19 Jorhat 5 Bongaigaon 8 20 Sivsagar Dhuburi 21 Dibrugarh 7 Kokrajhar 22 Tinsukia Chirang Total 74 SCHEDULE-D SCHEDULE-B 23 Cachar 27.26 80 Kamrup (M) 68.62 24 Karimganj Kamrup (R) 25 Hailakandi 11 Darrang 29 12 Udalguri Grand Total 250 235.00 13 Sonitpur 14 North Lakhimpur Dhemaji 73 Bid Doc. for Civil Work finalized

14 Way Ahead Determine location/ elevation of piezometers accurately using GPS, so that groundwater flow maps can be prepared Share the GW data to Irrigation Dept., CGWB and other agencies for needful. Findings of GWM system, could pave the way for adoption of Ground Water Policy for Assam State has recently adoption Groundwater Act THANKS CLICK


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