increase _BIG_ELEV in lake_mapper
increase _BIG_ELEV in lake_mapper

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