Added precipitation effeciency calculation to params.py
Added precipitation effeciency calculation to params.py

scollis/SHARPpy,djgagne/SHARPpy,blizzardwarriorwx/SHARPpy,blizzardwarriorwx/SHARPpy,djgagne/SHARPpy,djgagne/SHARPpy,blizzardwarriorwx/SHARPpy,djgagne/SHARPpy,blizzardwarriorwx/SHARPpy,scollis/SHARPpy,scollis/SHARPpy,scollis/SHARPpy