Index: /issm/trunk-jpl/src/m/classes/hydrologyglads.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/hydrologyglads.m	(revision 27392)
+++ /issm/trunk-jpl/src/m/classes/hydrologyglads.m	(revision 27393)
@@ -14,5 +14,5 @@
 		%Channels
 		ischannels           = 0;
-		channel_conductivity = 0.;
+		channel_conductivity = NaN;
 		channel_sheet_width  = 0.;
 
@@ -71,5 +71,5 @@
 			%Channels
 			md = checkfield(md,'fieldname','hydrology.ischannels','numel',[1],'values',[0 1]);
-			md = checkfield(md,'fieldname','hydrology.channel_conductivity','size',[md.mesh.numberofvertices],'>=',0,'NaN',1,'Inf',1);	
+			md = checkfield(md,'fieldname','hydrology.channel_conductivity','size',[md.mesh.numberofvertices 1],'>=',0,'NaN',1,'Inf',1);	
 			md = checkfield(md,'fieldname','hydrology.channel_sheet_width','numel',[1],'>=',0);	
 
Index: /issm/trunk-jpl/src/m/classes/hydrologyglads.py
===================================================================
--- /issm/trunk-jpl/src/m/classes/hydrologyglads.py	(revision 27392)
+++ /issm/trunk-jpl/src/m/classes/hydrologyglads.py	(revision 27393)
@@ -22,5 +22,5 @@
         #Channels
         self.ischannels = 0
-        self.channel_conductivity = 0.
+        self.channel_conductivity = np.nan
         self.channel_sheet_width = 0.
 
@@ -95,5 +95,5 @@
         #Channels
         md = checkfield(md, 'fieldname', 'hydrology.ischannels', 'numel', [1], 'values', [0, 1])
-        md = checkfield(md, 'fieldname', 'hydrology.channel_conductivity', 'numel', [1], '>', 0)
+        md = checkfield(md, 'fieldname', 'hydrology.channel_conductivity', 'size', [md.mesh.numberofvertices], '>', 0)
         md = checkfield(md, 'fieldname', 'hydrology.channel_sheet_width', 'numel', [1], '>=', 0)
 
@@ -122,5 +122,5 @@
         #Channels
         WriteData(fid, prefix, 'object', self, 'class', 'hydrology', 'fieldname', 'ischannels', 'format', 'Boolean')
-        WriteData(fid, prefix, 'object', self, 'class', 'hydrology', 'fieldname', 'channel_conductivity', 'format', 'Double')
+        WriteData(fid, prefix, 'object', self, 'class', 'hydrology', 'fieldname', 'channel_conductivity', 'format', 'DoubleMat', 'mattype', 1)
         WriteData(fid, prefix, 'object', self, 'class', 'hydrology', 'fieldname', 'channel_sheet_width', 'format', 'Double')