Waterwijzer Overlay

The waterwijzer overlay provides the yield loss of crops based on several input parameters. The yield loss is currently calculated by the Waterwijzer Landbouw module, which is described here.

Usage

The Waterwijzer Overlay results can be used to:

Calculate the loss of earnings based on existing crops for currently known highest and lowest ground water levels.
Calculate the loss of earnings for crops when using different ground water level management strategies simulated by a Ground Water Overlay or a Subsidence Overlay.
Determine the best type of crop per parcel given the highest and lowest ground water levels and type of soil.

Considerations

The Waterwijzer Overlay calculates loss of earnings for agriculture crops based on:

A climate scenario;
A weather station;
Type of soil;
Type of crop;
Highest and lowest (averaged) ground water levels;
The irrigation parameter, which in the Waterwijzer tool is active for a number of the crop types, is currently not taken into account.
The version of the Waterwijzer tool, for which we currently always use 2.0.0.

Result types

The overlay offers the following result types, each storing the agricultural loss of earnings in percentage. The categories are:

Dry: low water levels cause crops to dry out;
Wet: high water levels cause crops' roots to suffocate;
Indirect: Indirect causes, related to combinations of crop, soil, weather and water levels
Salt: salt water irrigation causes damage to crops;
Total: the sum of the previous four categories.

How-to's

Module

A Waterwijzer Overlay can be configured by opening the Waterwijzer Overlay Wizard. More in-depth information can be found under each of the categories below.