Transcript Assam Agricultural Competitiveness Project

ASSAM AGRICULTURAL
COMPETITIVENESS PROJECTADDITIONAL FINANCING
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Groundwater Monitoring System
BACKGROUND - RATIONALE FOR THIS SYSTEM

Abundance rainfall during monsoon (ranging from 1500 3000 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
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NERIWALM STUDY OF 2004 …. KEY FINDINGS
NERIWALM: North
Eastern Regional
Institute of Water and
Land Management
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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 Normal Total
Annual
Safe No of STW's Category
District rainfall rainfall groundwater yield of that can be
recharge availability ground
installed
water
Ha
mm
Ha-m
Ha-m
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
Semi-Critical
Kamrup (M)
98072
1800
17594
12690
9242
3081
Safe
Nalbari
98013
2772
35583
38035
25842
8614
Safe
435343
445525
220553
73518
Safe
Total
The number of STWs to installed per district under AACP and other
schemes is determined based on these two Studies done under AACP
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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.
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
Telemetric system for automatic monitoring at required frequency
VISIT TO HIMACHAL PRADESH & PUNJAB

Team of officials from PCU and Agriculture Engineering
Dept. led by SPD had visited HP and Punjab to have firsthand exposure of Groundwater monitoring system
established under Bank financed HP-II
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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 shortterm and long-term hydrologic stresses

Shallow aquifers frequent measurements,
while deep confined aquifers need less.

Measurement Frequency should link to
withdrawal of GW
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VISIT TO HP & PUNJAB: EXPERIENCE GAINED
 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
..CONTD.
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IMPLEMENTATION ARRANGEMENTS

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
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IMPLEMENTATION ARRANGEMENTS
… CONTD

Process for hiring experts for GWM Cell such as HydroGeologists, 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
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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
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DISTRICT WISE No. OF PIEZOMETER BORE-HOLE
Sl.
District
SCHEDULE-A
1 Baska
2 Nalbari
3 Barpata
4 Goalpara
5 Bongaigaon
6 Dhuburi
7 Kokrajhar
8 Chirang
Total
SCHEDULE-B
9 Kamrup (M)
10 Kamrup (R)
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12
13
14
Darrang
Udalguri
Sonitpur
North
Lakhimpur
15 Dhemaji
Total
No.of
Approx. Comple Sl.
Piezometer value of tion
Bore hole work (Rs. Period
Lakhs)
10
6
10
10
8
10
10
10
74
69.56
180
8
10
10
10
15
10
10
73
68.62
180
District
SCHEDULE-C
16 Nagaon
17 Morigaon
18 Golaghat
19 Jorhat
20 Sivsagar
21 Dibrugarh
22 Tinsukia
Total
SCHEDULE-D
23 Cachar
24 Karimganj
25 Hailakand
i
Total
Grand Total
No.of
Approx. Comple
Piezomete value of
tion
r Bore
work (Rs. Period
hole
Lakhs)
15
9
10
10
10
10
10
74
69.56
180
15
7
7
27.26
80
29
250
235.00
Bid Doc. for Civil Work finalized
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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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