WAsP11-contraints

Contraints in WAsP 11.02

In WAsP 11.02.0062 there are some new constraints on how WAsP interpolates/extrapolates in the default calculation heights and roughness lengths (both defined in the WAsP parameters). The consequence is that WAsP can no longer calculate outside the limits of the 5 default heights and roughness lengths. This is especially a problem for roughness length where the default maximum is 1.5 and in windPRO we use 1.6 for roughness class 4. This basically means if you have a project with roughness class 4 you will get the following error: “Error: -1, climate calculation: meso-scale roughness lies outside gwc roughness classes” if you use the default WAsP parameters. To fix the problem you can change the maximum roughness length in the WAsP parameters to 1.6.