Groundwater Mapping Concept

Challenge

Explotation of the groundwater ressources requires knowledge of the hydrogeology in order to achieve a sustainable management and use of the ressources.

Solution

The Danish concept to Groundwater mapping is a comprehensive and efficient framework to aquire sufficient and accurate knowledge on the groundwater ressources. Groundwater mapping consists of several activities to collect, process and combine surface and subsurface data of an area. Depending on existing knowledge and data, different elements within the framework can be relevant for at specific project.

The relevant data consist of geophysical, geological, hydrogeological, hydrological data, geochemistry and land use data. The processing provides a hydrogeological model and by combining groundwater modeling with pollution risks vulnerable groundwater ressources can be mapped and used for designing sustainable groundwater abstraction. The surveys will result in a huge amount of data and an important part of the Danish concept is to offer relevant databases and specialized software. The quality of the data is very important and quality control systems together with the right specifications are also included in the concept.

Illustration

GroundwaterMappingIllustration

Time Frame

The overall timeframe for conducting a groundwater mapping will depend on the area size and the number of activities included in the project. It also depends on the requirements for drilling campains to verify the geophysical survey. However data collection including surveys and processing, followed by modeling and reporting can be conducted within ½-2 years.

General Activities
Project Management

The project management is provided to ensure the project is completed according to specification, plans and agreements. There will be focus on collaboration, finances and time throughout the project. To achieve flow, project management will constantly focus on those activities that are located further into the future.

Capacity Building

Capacity building is an ongoing process through which individuals, groups,organisations and societies enhance their ability to understand and conduct elements of groundwater mapping.

IT-infrastructure

The necessary IT infrastructure is part of the overall solution. Servers and software are offered as part of the project.

Logistics

In order to carry out a project as smoothly as possible a local office will be established or an agreement will be made with a local geological specialist company. The local office will handle any customs cleares, necessary authorizations and local laws.The office also serves as the basis for cooperation with local partners.

Concept in Detail
Preproject Activities

Provide an inception report to point out relevant elements in a groundwater mapping project. This also includes identification of local stakeholders and partners.

Background Research

Factfinding on existing data and information relevant for the groundwater ressources – data on geochemistry, geology, hydrogeology, land use, surface waters, water use, pumping and pollution.

Geophysical Survey

SkyTEM airborne survey combined with other relevant geophysical metodes to provide large scale mapping of the subsurface electrical resistivity and converting it into hydrogeological information.

Drilling and Monitoring Campaign

In situ information on geology and hydrogeology is acquired through the planning and execution of programs for drilling, logging and pumping tests. Monitoring campaigns also includes measurements of groundwater levels and development of map of the water level.

Geochemistry & Impact from Land Use and Pollution

By collecting and analysing groundwater samples, the chemical composition is revealed. The nature of the impact that groundwater has been exposed to on its way down through the soil is described by combining information on land use and pollution with geology.

Geology and Hydrogeology

Geological and geophysical data are interpreted into a geological model. The geological frame is expanded using af conceptual understanding into a hydrogeological model. The hydrogeological model combines data and assumptions in order to achieve and understand the flow regime.

Hydrological and Groundwater Modelling

3D groundwater modeling is used with the results of the chemical, geological and hydrogeological mapping to achieve a better understanding of water balances, groundwater recharge and flow patterns and transport times. The groundwater model constitutes subsequently a tool for testing different strategies for the exploitation and management of groundwater resources.

Report and Documentation

The work and findings carried out are reported and documented in comprehensive reports. The complete groundwater mapping will result in designation of groundwater resources and their vulnerability. Recommendations on sustainable groundwater management wil be given in the reports.

System Setup

Managing and quality assurance of collected and existing data is done using databases – eg. geological, geophysical and geochemical databases. Specifications and design of the databases, quality systems is provided.

Methodology

Depending on existing data and knowledge the further investigation is designed for optimal results. Design includes choice and description of methodology to conduct investigations.

 

Solution Delivered By
Depending on the activites relevant for a specific project a number of companies are included in the project organisation. It can be some or all of the following companies and institutions:
SkyTEM is a unique geophysical survey method using airborne survey systems. It is the only existing airborne geophysical system to be specific developed to do groundwater surveys.
Experts in geology and hydrogeology modelling. Services also include setting up systems for data management and databases on local and governmental level and capacity building.
Provider and experts of geological and hydrogeological modeling tool. Services also include geological modeling and capacity building within geological and hydrological
modeling.
Developer and manufacturer of sensors. Product range includes transducers for displacement,
pressure, differential pressure, level and the associated signal conditioners.
To learn more about this concept, please contact:
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