physical & quality groundwater monitoring information for effective management information for...
TRANSCRIPT
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Physical & Quality Groundwater Physical & Quality Groundwater Monitoring Monitoring
Information for effective management Information for effective management Groundwater Management for
Hygiene and Sanitation IWSD – Harare June 2011
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Millions of m3 pumped every year: Monitored? Who? How?
100’s of thousands of users: Registered? Controlled?
10’s of thousands of wells/boreholes: Registered? Maintained? Info. about location, abstraction levels, water levels, water quality, formation, etc –
1000’s of sources of pollution: Location, nature & quantity of pollutants? aquifer vulnerability?
Many governing departments/institutions: Joint management ? Coordination / cooperation?
GROUNDWATER STATUS QUOGROUNDWATER STATUS QUO
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MONITORING: WHO? MONITORING: WHO?
• Who requires/requests for monitoring?
• Who determines priorities and expected outcomes?
• Who pays?
• Who implements the monitoring?
• Who owns/ shares the data?
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GROUNDWATER USE AND QUALITY GROUNDWATER USE AND QUALITY MONITORING MONITORING
• Principles of groundwater monitoring
• Monitoring cycle and tools
• Monitoring resource use and aquifer response
• Groundwater quality monitoring
• Effectiveness, cost and quality control
• Examples
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WHAT IS MONITORING NOT?WHAT IS MONITORING NOT?
PROVIDING IRRELEVANT INFORMATION TO ILL DEFINED QUESTIONSPROVIDING IRRELEVANT INFORMATION TO ILL DEFINED QUESTIONS
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WHAT IS GROUNDWATER MONITORINGWHAT IS GROUNDWATER MONITORING?
Groundwater monitoring comprises the collection, analysis and storage of data
on a regular basis to provide information for effective groundwater management
to a variety of stakeholders.
Monitoring makes groundwater visible, if…….
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SYSTEM BASIC FUNCTION WELL LOCATIONS
Primary(Referenc
e)
evaluation of general groundwater behaviour, e.g.: trends(variation in land use) and processes (recharge)
in areas withuniform
hydrogeologyand land use.
Secondary(Early
warning Protection
)
protection against potential impacts to:well-fields/springheads for public WSurban infrastructure (land subsidence)archaeological sites against rising WTgroundwater-dependent ecosystems
around facilities/areas/
features requiring
Protection.
Tertiary(Pollution impacts)
early warning of groundwater impacts from:• diffuse sources (intensive agr. land use)• point sources (industrial sites etc)
immediately down +
up-gradient from hazard
Compliance
(management)
Complying to requirements in a permit (abstraction rates, quality changes, water level decline)
Around groundwater well fields
Groundwater Monitoring Systems by FunctionGroundwater Monitoring Systems by Function
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Object of protectionEarly warning
Pollution sourceImpact monitoring
Groundwater abstractionCompliance /management + early warning
monitoring
Impacts
Risks
Impacts
Risks
Trend monitoring
Purpose and function of monitoringPurpose and function of monitoring
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Groundwater is invisible
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Maputo 1984
Recharge estimations
So = 40 mm
Rainfall: 800-850 mm/year
Recharge: 165-185 mm/year
RECHARGE ESTIMATES MAPUTORECHARGE ESTIMATES MAPUTO
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Monitoring for well field operaton- daily abstraction / pumping hours- well performance
Monitoring - water level fluctuations- water quality for purpose of use
Monitoring for resource mgt.- allocation / abstraction control- quality /pollution control- environmental flows- information sharing/ knowledge dev.- awareness /demand mgt.
Monitoring - linkage with other planning sectors.
Well field operation Industrial Drinking water Irrigation water
Monitoring well
MONITORING: DIFFERENT PURPOSE <> SAME MONITORING: DIFFERENT PURPOSE <> SAME DATA DATA
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Groundwater is a hidden resource to which we have no direct access
Contrary to surface water, changes in groundwater quality and quantity are slow processes which cannot be determined by snap shot monitoring
Changes in groundwater quality are often irreversible
WHY IS GROUNDWATER MONITORING WHY IS GROUNDWATER MONITORING IMPORTANT? IMPORTANT?
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GROUNDWATER USE AND QUALITY GROUNDWATER USE AND QUALITY MONITORING MONITORING
• Principles of groundwater monitoring
• Monitoring cycle
• Monitoring resource use and aquifer response
• Groundwater quality monitoring
• Effectiveness, cost and quality control
• Examples
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THE MONITORING CYCLETHE MONITORING CYCLE
Management question Management question and monitoring and monitoring
objectivesobjectives
Definition of informationDefinition of information needsneeds
Collection of static and Collection of static and dynamic datadynamic data
Data storage, Data storage, interpretation and interpretation and
disseminationdissemination
Management information Management information and actionsand actions
• Trends and Trends and changeschanges
• Impacts and risksImpacts and risks
• Compliance Compliance
• Groundwater Groundwater specificspecific
• Water useWater use
• Supporting dataSupporting data
Information > data > information
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Type of data
Static data (design phase, reference)
Dynamic data (monitoring changes)
Groundwater specific data
- existing data on grw. levels - existing data on grw. quality- tests on existing wells- information from new wells- aquifers tests
- monitoring observation wells (levels and quality)- monitoring existing wells- monitoring springs
Water use
- population registers- water use inventories
- demographic changes - monitoring water use
Supporting data
- surface water / springs- climate data- land use data- geological data (existing wells)
- surface water monitoring- rainfall /climate data- changes in land use
WHAT DATA DO WE COLLECTWHAT DATA DO WE COLLECT??
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• Monitoring networks• Network density (hydrogeological and hydro-chemical
heterogeneity/complexity)• Location observation points (existing used wells,
abandoned wells, new observation wells, climate, surface water, water use)
• Monitoring parameters • Measuring and sampling frequency (instruments,
budget, monitoring program)
• Satellite images and airborne surveys • Statistics
Factors determining design• Budget, • Monitoring objectives
HOW DO WE MONITOR ? HOW DO WE MONITOR ?
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MONITORING POINTSMONITORING POINTS
Climate
River water
Wadi Flows
Groundwater
Water use
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GROUNDWATER USE AND QUALITY GROUNDWATER USE AND QUALITY MONITORING MONITORING
• Principles of groundwater monitoring
• Monitoring cycle and tools
• Monitoring resource use and aquifer response
• Groundwater quality monitoring
• Effectiveness, cost and quality control
• Examples
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AQUIFER REPONSE: WATER LEVELS AQUIFER REPONSE: WATER LEVELS
•Historic data
Example: Water saving to reduce aquifer depletion
•Monitoring data
•Baseline data (reference)
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MONITORING FOR RESOURCE USE & AQUIFER RESPONSEMONITORING FOR RESOURCE USE & AQUIFER RESPONSE
Monitoring of groundwater levels and groundwater use is needed to verify the predicted aquifer response for management scenarios.
Important issues: •knowledge of the reference situation: historic and baseline data•groundwater flow is related to the groundwater levels•water level response is related to the use
But: There remains always a certain uncertainty
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HYDROGRAPHS: NYAMANDLOVU SST AQUIFER
Nyamandlovu SST Aquifer: BH Umgu-093 Hydrograph
1110.00
1112.00
1114.00
1116.00
1118.00
1120.00
1122.00
1124.00
1126.00
1128.00
1130.00
01/1989 Sep-90 May-92 Jan-94 Sep-95 May-97 Jan-99 Sep-00
Year
Wat
er L
evel
Alt
itu
de
(m)
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•Direct monitoring- metering and regular inspection
•Indirect monitoring - energy consumption and average pumping rates- pumping hours and average pumping rate- population estimates and random tests (drinking water)- use of remote sensing information (irrigation water use)
MONITORING GROUNDWATER USE MONITORING GROUNDWATER USE
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GROUNDWATER USE AND QUALITY GROUNDWATER USE AND QUALITY MONITORING MONITORING
• Principles of groundwater monitoring
• Monitoring cycle and
• Monitoring resource use and aquifer response
• Groundwater quality monitoring
• Effectiveness, cost and quality control
• Examples
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MONITORING FOR GROUNDWATER QUALITY MONITORING FOR GROUNDWATER QUALITY
Sampling of production wells• cheap but often unreliable/not representative
• useful to determine the reference situation
Sampling of purpose- drilled monitoring wells:• Reference monitoring for natural water quality /natural recharge
• Offensive monitoring of pollution sources
• Defensive monitoring for groundwater supplies
• Evaluation monitoring for sites of known aquifer contamination
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MONITORING STRATEGIESMONITORING STRATEGIES
Offensive monitoringEarly detection of incipient aquifer contamination by known pollution sources
Defensive monitoringProvide warning of pollution plumes threatening potable well fields or individual wells
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WHERE TO LOCATE MONITORING POINTS ?WHERE TO LOCATE MONITORING POINTS ?
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Physical parameters (indicators)- Electric conductivity /temperature
- pH
- DO
•Manuel and automatic recorders
Water sampling and analysis
parameters selected in the light of the quality objective and pollution hazard assessment: quality assurance and control
MONITORING FOR GROUNDWATER QUALITY MONITORING FOR GROUNDWATER QUALITY
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GROUNDWATER USE AND QUALITY GROUNDWATER USE AND QUALITY MONITORING MONITORING
• Principles of groundwater monitoring
• Monitoring cycle and
• Monitoring resource use and aquifer response
• Groundwater quality monitoring
• Effectiveness, cost and quality control
• Examples
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HOW ARE RESPONSIBILITIES HOW ARE RESPONSIBILITIES SHARED ?SHARED ?
Typical division of responsibilities• National level: basic reference networks/ climate stations
• Regional level/RBA/AMOR: regulation control + protection
• Contractors: contractual obligation for well testing
• Large abstractors: monitoring requirements in permit
• Local water users: self monitoring / awareness
Legal and regulatory basis required through water rights / water allocation plan /permitting system etc
+ Data collected by other agencies+ Data collected by other agencies
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QUALITY ASSURANCE AND QUALITY QUALITY ASSURANCE AND QUALITY CONTROLCONTROL
Prevention (assurance) is better than cure (control)
• Starts with the observer: cross checks, keep your eyes open
• Guidelines: follow procedures (e.g. for sampling)
• Keep copy of field readings • QA/AC on chemical analysis• QC procedures for data entry in MIS• QC control in data processing
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HOW ENSURE THAT MONITORING IS COST HOW ENSURE THAT MONITORING IS COST EFFECTIVE?EFFECTIVE?
• Monitoring by objectives
• Include cost-benefit analysis in project design
• Promote cost effectiveness and reliability by:• Defining clear information needs
• Use of data already collected in other programs
• Use of existing wells (abstraction wells and abandoned wells)
• Use of indicators: water level/temperature /EC (divers)
• Promoting self monitoring and self regulation
• Effective QC and QA system
Monitoring is considered expensive because the return on investment is generally not visible in the short run
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GROUNDWATER USE AND QUALITY GROUNDWATER USE AND QUALITY MONITORING MONITORING
• Principles of groundwater monitoring
• Monitoring cycle and
• Monitoring resource use and aquifer response
• Groundwater quality monitoring
• Effectiveness, cost and quality control
• Examples
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Groundwater fund used for:- Monitoring- Research- Training & manpower dev.
•Tariff 8.5 Bht
•Tariff 3.5 Bht
BANGKOK: REGULATION AND GROUNDWATER FUNDBANGKOK: REGULATION AND GROUNDWATER FUND
- Regulatory and economic measures
- Imposed based on monitoring information
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CONCLUSIONCONCLUSION
WHAT IS THE HEIGHT OF
THAT TOWER IN METERS ?
I HAVE MEASURED IT WITH TWO DIFFERENT
MEASURING TAPES AND THE HEIGHT IS 26 +/- 2 METERS.
Monitoring makes groundwater visible if it:
• addresses well-defined management information needs (demand driven), is
• cost-effectively implemented providing
• reliable information
Thank you
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Exercise: 3 Groups
1 Monitoring a dune infiltration system to protect a drinking water well field against seawater intrusion
2 Monitoring plan for an industrial site to prevent spreading of possible contaminants through the groundwater
3 Monitoring system for trend monitoring in a sedimentary shallow aquifer in river basin
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Exercise: 3 Groups
• Define the monitoring objectives and basic design parameters
• What are the main benefits and who are the main beneficiaries of the monitoring
• Suggestions to make the monitoring plan cost effective
• How to assure sustainable financing?
• Who will implement the monitoring and how is the monitoring information handled to address the management objectives
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HYDROCHEMISTRY: QA and QR !!!HYDROCHEMISTRY: QA and QR !!!
• Field measurements (EC and pH)• Sampling procedures • Ion balance• Extreme values (high and low) • Use certified labs• Contra expertise (5% of the samples)
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GROUNDWATER SAMPLINGGROUNDWATER SAMPLING