How does it work?

The tool selects the land use relevant for each well and converts the quality impact on the recharge via simplified subsurface transport to the abstraction well(s ).

Software

The software has been developed to enable a quick scan of well water quality changes resulting from variations in land use. It answers questions like: How long will it take for a reduction in the use of agricultural fertilizer to be reflected in an improvement in abstracted water quality, and how extensive will this improvement be?

Implementation:
The tool is a simple, web-enabled GIS application, which handles one substance per simulation. The input takes the form of maps (in the ESRI-ASCII grid format) and a table (in a CSV file).

The following input maps are needed:

• Land use identified with integer IDs.
• Amount of recharge.
• Destination identified with integer well IDs, where 0 indicates that the recharge of a cell does not end up in a well.
• Travel time of recharge to well.

The input table must contain:

• A line with column headers : “date” for the first column and the land use IDs for the subsequent columns
• Subsequent lines consisting of a date followed by a concentration value for each land use

The output is a graph with the concentration development for each well ID found in the input.

There are several forms of support available to ensure you can optimise your use of WellGrapher and to update you on latest developments around the development of the water quality in abstraction wells.
Specifically, you can make use of the following options to suit your particular situation.

• A short introductory course on WellGrapher.
• Consultancy services.
  Specifically, the preliminary analysis with WFA can be extended with more detailed analyses by our experts of:
  o Water quality impact of various land uses
  o Groundwater flow
  o Quality changes during the subsurface transport.

Mentioned in: 4 Publications and 1 PhD Thesis
Enrolled in: 1 Case in 1 Country

Publications

• Cors van den Brink, Willem Jan Zaadnoordijk, Bas van der Grift, Peter C. de Ruiter, Jasper Griffioen (2008)
  Using a groundwater quality negotiation support system to change land-use management near a drinking-water abstraction in the Netherlands
  Journal of Hydrology (2008) 350, 339– 356
• Vink, Kees
  Pilotstudie met Respond naar winning Heumensoord wijst op hoge nutriëntenbelasting uit stedelijk gebied
  BTO 2007.026
• Wuijts, S., van Rijswick, H.F.M.W., Dik, H.H.J.
  Gebiedsdossiers voor drinkwaterbronnen. Uitwerking van risico's en ontwikkeling van maatregelen
  RIVM Rapport 734301032/2007 
• Cors van den Brink, Willem J. Zaadnoordijk (1995)
  Evaluation of Ground-Water Contamination from Nonpoint Sources: A Case Study
  Groundwater, Volume 33, Issue 3, pages 356-365, May 1995

PHD-thesis

• van den Brink, C
  Land use and groundwater quality
  ISBN: 978-90-6266-262-3