We implemented HydPy-Evap-MORSIM as discussed in #111. There is still room for minor technical improvements, but the model's "hydrological functioning" is clear now. We see a marked overprediction in evaporation in a project area in northern Germany, which agrees with LARSIM's tendency to estimate high (potential) evapotranspiration rates. Considering also the relevant uncertainties in some process equations (partly discussed in #111), we decided to be inspired by the original AMBAV model, developed and used by the German Meteorological Service (Deutscher Wetterdienst). For a start, we will create a new model called HydPy-Evap-AMBAV-1.0 or evap_ambav_1, which works precisely like HydPy-Evap-MORSIM, and then replace some of its equations with more AMBAV-like equations. I will note the changes in this issue to keep the overview and everybody informed. We will see if this effort results in a complete AMBAV-like model or more in a MORSIM-AMBAV hybrid.