Index: wflow-py/wflow/wflow_sbm.py
===================================================================
diff -u -r0b96c88d78399876956d6e546c7c88dc65f11075 -r0767337f4510ceba10d041dfb6639e069503798d
--- wflow-py/wflow/wflow_sbm.py	(.../wflow_sbm.py)	(revision 0b96c88d78399876956d6e546c7c88dc65f11075)
+++ wflow-py/wflow/wflow_sbm.py	(.../wflow_sbm.py)	(revision 0767337f4510ceba10d041dfb6639e069503798d)
@@ -1303,14 +1303,14 @@
 
         #only run the reservoir module if needed
         if self.nrres > 0:
-            self.ReservoirVolume, self.Outflow, self.ResPecrFull,\
+            self.ReservoirVolume, self.Outflow, self.ResPercFull,\
             self.DemandRelease = simplereservoir(self.ReservoirVolume, self.SurfaceRunoff,\
                                                  self.ResMaxVolume, self.ResTargetFullFrac,
                                                  self.ResMaxRelease, self.ResDemand,
                                                  self.ResTargetMinFrac, self.ReserVoirLocs,
                                                  timestepsecs=self.timestepsecs)
             self.OutflowDwn = upstream(self.TopoLddOrg,cover(self.Outflow,scalar(0.0)))
-            self.Inflow = cover(self.OutflowDwn,self.Inflow)
+            self.Inflow = self.OutflowDwn + cover(self.Inflow,self.ZeroMap)
 
 
         self.ExfiltWaterCubic = self.ExfiltWater * self.ToCubic