Corrected calculation of mu
Corrected calculation of mu

landlab/landlab,cmshobe/landlab,RondaStrauch/landlab,SiccarPoint/landlab,decvalts/landlab,ManuSchmi88/landlab,ManuSchmi88/landlab,ManuSchmi88/landlab,csherwood-usgs/landlab,RondaStrauch/landlab,RondaStrauch/landlab,decvalts/landlab,cmshobe/landlab,csherwood-usgs/landlab,landlab/landlab,amandersillinois/landlab,Carralex/landlab,laijingtao/landlab,laijingtao/landlab,SiccarPoint/landlab,cmshobe/landlab,amandersillinois/landlab,Carralex/landlab,landlab/landlab,Carralex/landlab