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.