Precipitation lapse rate
Precipitation tends to increase with elevation. MIKE SHE assumes that this increase is linear. Similarly, precipitation varies spatially across the catchment, but the amount of local precipitaiton is also a function of the elevation. However, the different areas will have precipitation-elevation relationships. So, for precipitation, it may be important to have a distribution of lapse rates that depends on the slope orientation, etc. Thus, it is likely necessary to have locally varying lapse rates that depend on the orientation of valleys.