Index: wflow-py/wflow/wflow_sbm.py
===================================================================
diff -u -rdef023660c30cb9c63deb1f58b559716ad15d2ed -r78b81240834b72259fab14b4081f2b9cf0cd44ec
--- wflow-py/wflow/wflow_sbm.py	(.../wflow_sbm.py)	(revision def023660c30cb9c63deb1f58b559716ad15d2ed)
+++ wflow-py/wflow/wflow_sbm.py	(.../wflow_sbm.py)	(revision 78b81240834b72259fab14b4081f2b9cf0cd44ec)
@@ -399,7 +399,7 @@
         self.updateFile = configget(self.config, "model", "updateFile", "no_set")
         self.origTopogLateral = int(configget(self.config, "model", "origTopogLateral", "0"))
 
-        if self.origTopogLateral:
+        if self.origTopogLateral == 0:
             self.logger.info("Applying the original topog_sbm lateral transfer formulation")
         else:
             self.logger.warn("Using the original (depreciated!!) wflow lateral transfer formulation")
@@ -707,6 +707,7 @@
         self.CumInfiltExcess = self.ZeroMap
         self.CumExfiltWater = self.ZeroMap
         self.CumSurfaceWater = self.ZeroMap
+        self.watbal = self.ZeroMap
         self.CumEvap = self.ZeroMap
         self.CumPotenEvap = self.ZeroMap
         self.CumPotenTrans = self.ZeroMap
@@ -1301,7 +1302,7 @@
     runId = "run_default"
     configfile = "wflow_sbm.ini"
     _lastTimeStep = 0
-    _firstTimeStep = 1
+    _firstTimeStep = 0
     LogFileName = "wflow.log"
     fewsrun = False
     runinfoFile = "runinfo.xml"