Index: /issm/trunk-jpl/src/c/classes/Elements/Element.cpp
===================================================================
--- /issm/trunk-jpl/src/c/classes/Elements/Element.cpp	(revision 22135)
+++ /issm/trunk-jpl/src/c/classes/Elements/Element.cpp	(revision 22136)
@@ -1815,8 +1815,10 @@
 	IssmDouble* base     = xNew<IssmDouble>(numvertices);
 	IssmDouble* values   = xNew<IssmDouble>(numvertices);
-
-	parameters->FindParam(&deepwaterel,BasalforcingsDeepwaterElevationEnum);
-	parameters->FindParam(&upperwaterel,BasalforcingsUpperwaterElevationEnum);
-	parameters->FindParam(&deepwatermelt,BasalforcingsDeepwaterMeltingRateEnum);
+	IssmDouble time;
+
+	parameters->FindParam(&time,TimeEnum);
+	parameters->FindParam(&deepwaterel,BasalforcingsDeepwaterElevationEnum,time);
+	parameters->FindParam(&upperwaterel,BasalforcingsUpperwaterElevationEnum,time);
+	parameters->FindParam(&deepwatermelt,BasalforcingsDeepwaterMeltingRateEnum,time);
 
 	this->GetInputListOnVertices(base,BaseEnum);
Index: /issm/trunk-jpl/src/c/modules/ModelProcessorx/CreateParameters.cpp
===================================================================
--- /issm/trunk-jpl/src/c/modules/ModelProcessorx/CreateParameters.cpp	(revision 22135)
+++ /issm/trunk-jpl/src/c/modules/ModelProcessorx/CreateParameters.cpp	(revision 22136)
@@ -34,4 +34,5 @@
 	bool         autodiff_mass_flux_present = false;
 	bool         mass_flux_present          = false;
+	bool         interp;
 	IssmDouble **array                      = NULL;
 	int         *mdims_array                = NULL;
@@ -43,4 +44,5 @@
 
 	IssmDouble *temp = NULL;
+	IssmDouble *transparam = NULL;
 	IssmDouble  yts;
 	int         N,M;
@@ -173,7 +175,11 @@
 			break;
 		case LinearFloatingMeltRateEnum:
-			parameters->AddObject(iomodel->CopyConstantObject("md.basalforcings.deepwater_melting_rate",BasalforcingsDeepwaterMeltingRateEnum));
-			parameters->AddObject(iomodel->CopyConstantObject("md.basalforcings.deepwater_elevation",BasalforcingsDeepwaterElevationEnum));
-			parameters->AddObject(iomodel->CopyConstantObject("md.basalforcings.upperwater_elevation",BasalforcingsUpperwaterElevationEnum));
+			iomodel->FindConstant(&interp,"md.timestepping.interp_forcings");
+			iomodel->FetchData(&transparam,&N,&M,"md.basalforcings.deepwater_melting_rate"); 
+			parameters->AddObject(new TransientParam(BasalforcingsDeepwaterMeltingRateEnum,&transparam[0],&transparam[M],interp,M)); _assert_(N==2 || N==1);
+			iomodel->FetchData(&transparam,&N,&M,"md.basalforcings.deepwater_elevation"); 
+			parameters->AddObject(new TransientParam(BasalforcingsDeepwaterElevationEnum,&transparam[0],&transparam[M],interp,M)); _assert_(N==2 || N==1);
+			iomodel->FetchData(&transparam,&N,&M,"md.basalforcings.upperwater_elevation"); 
+			parameters->AddObject(new TransientParam(BasalforcingsUpperwaterElevationEnum,&transparam[0],&transparam[M],interp,M)); _assert_(N==2 || N==1);
 			break;
 		case MismipFloatingMeltRateEnum:
Index: /issm/trunk-jpl/src/m/classes/linearbasalforcings.m
===================================================================
--- /issm/trunk-jpl/src/m/classes/linearbasalforcings.m	(revision 22135)
+++ /issm/trunk-jpl/src/m/classes/linearbasalforcings.m	(revision 22136)
@@ -47,19 +47,19 @@
 			if ismember('MasstransportAnalysis',analyses) & ~(strcmp(solution,'TransientSolution') & md.transient.ismasstransport==0),
 				md = checkfield(md,'fieldname','basalforcings.groundedice_melting_rate','NaN',1,'Inf',1,'timeseries',1);
-				md = checkfield(md,'fieldname','basalforcings.deepwater_melting_rate','>=',0,'numel',1);
-				md = checkfield(md,'fieldname','basalforcings.deepwater_elevation','<','basalforcings.upperwater_elevation','numel',1);
-				md = checkfield(md,'fieldname','basalforcings.upperwater_elevation','<',0,'numel',1);
+				md = checkfield(md,'fieldname','basalforcings.deepwater_melting_rate','>=',0,'singletimeseries',1);
+				md = checkfield(md,'fieldname','basalforcings.deepwater_elevation','<','basalforcings.upperwater_elevation','singletimeseries',1);
+				md = checkfield(md,'fieldname','basalforcings.upperwater_elevation','<=',0,'singletimeseries',1);
 			end
 			if ismember('BalancethicknessAnalysis',analyses),
 				md = checkfield(md,'fieldname','basalforcings.groundedice_melting_rate','NaN',1,'Inf',1,'size',[md.mesh.numberofvertices 1]);
-				md = checkfield(md,'fieldname','basalforcings.deepwater_melting_rate','>=',0,'numel',1);
-				md = checkfield(md,'fieldname','basalforcings.deepwater_elevation','<','basalforcings.upperwater_elevation','numel',1);
-				md = checkfield(md,'fieldname','basalforcings.upperwater_elevation','<=',0,'numel',1);
+				md = checkfield(md,'fieldname','basalforcings.deepwater_melting_rate','>=',0,'singletimeseries',1);
+				md = checkfield(md,'fieldname','basalforcings.deepwater_elevation','<','basalforcings.upperwater_elevation','singletimeseries',1);
+				md = checkfield(md,'fieldname','basalforcings.upperwater_elevation','<=',0,'singletimeseries',1);
 			end
 			if ismember('ThermalAnalysis',analyses) & ~(strcmp(solution,'TransientSolution') & md.transient.isthermal==0),
 				md = checkfield(md,'fieldname','basalforcings.groundedice_melting_rate','NaN',1,'Inf',1,'timeseries',1);
-				md = checkfield(md,'fieldname','basalforcings.deepwater_melting_rate','>=',0,'numel',1);
-				md = checkfield(md,'fieldname','basalforcings.deepwater_elevation','<','basalforcings.upperwater_elevation','numel',1);
-				md = checkfield(md,'fieldname','basalforcings.upperwater_elevation','<',0,'numel',1);
+				md = checkfield(md,'fieldname','basalforcings.deepwater_melting_rate','>=',0,'singletimeseries',1);
+				md = checkfield(md,'fieldname','basalforcings.deepwater_elevation','<','basalforcings.upperwater_elevation','singletimeseries',1);
+				md = checkfield(md,'fieldname','basalforcings.upperwater_elevation','<=',0,'singletimeseries',1);
 				md = checkfield(md,'fieldname','basalforcings.geothermalflux','NaN',1,'Inf',1,'timeseries',1,'>=',0);
 			end
@@ -80,14 +80,14 @@
 
 			floatingice_melting_rate=zeros(md.mesh.numberofvertices,1);
-			floatingice_melting_rate(find(md.geometry.base<=md.basalforcings.deepwater_elevation))=md.basalforcings.deepwater_melting_rate;
-			pos=find(md.geometry.base>md.basalforcings.deepwater_elevation & md.geometry.base<md.basalforcings.upperwater_elevation);
-			floatingice_melting_rate(pos)=md.basalforcings.deepwater_melting_rate*(md.geometry.base(pos)-md.basalforcings.upperwater_elevation)/(md.basalforcings.deepwater_elevation-md.basalforcings.upperwater_elevation);
+			floatingice_melting_rate(find(md.geometry.base<=md.basalforcings.deepwater_elevation(1,1)))=md.basalforcings.deepwater_melting_rate(1,1);
+			pos=find(md.geometry.base>md.basalforcings.deepwater_elevation(1,1) & md.geometry.base<md.basalforcings.upperwater_elevation(1,1));
+			floatingice_melting_rate(pos)=md.basalforcings.deepwater_melting_rate(1,1)*(md.geometry.base(pos)-md.basalforcings.upperwater_elevation(1,1))/(md.basalforcings.deepwater_elevation(1,1)-md.basalforcings.upperwater_elevation(1,1));
 			WriteData(fid,prefix,'name','md.basalforcings.model','data',2,'format','Integer');
 			WriteData(fid,prefix,'data',floatingice_melting_rate,'format','DoubleMat','name','md.basalforcings.floatingice_melting_rate','mattype',1,'scale',1./yts,'timeserieslength',md.mesh.numberofvertices+1,'yts',md.constants.yts)
 			WriteData(fid,prefix,'object',self,'fieldname','groundedice_melting_rate','format','DoubleMat','name','md.basalforcings.groundedice_melting_rate','mattype',1,'scale',1./yts,'timeserieslength',md.mesh.numberofvertices+1,'yts',md.constants.yts)
 			WriteData(fid,prefix,'object',self,'fieldname','geothermalflux','name','md.basalforcings.geothermalflux','format','DoubleMat','mattype',1,'timeserieslength',md.mesh.numberofvertices+1,'yts',md.constants.yts);
-			WriteData(fid,prefix,'object',self,'fieldname','deepwater_melting_rate','format','Double','name','md.basalforcings.deepwater_melting_rate','scale',1./yts)
-			WriteData(fid,prefix,'object',self,'fieldname','deepwater_elevation','format','Double','name','md.basalforcings.deepwater_elevation')
-			WriteData(fid,prefix,'object',self,'fieldname','upperwater_elevation','format','Double','name','md.basalforcings.upperwater_elevation')
+			WriteData(fid,prefix,'object',self,'fieldname','deepwater_melting_rate','format','DoubleMat','mattype',3,'timeserieslength',2,'name','md.basalforcings.deepwater_melting_rate','scale',1./yts,'yts',md.constants.yts)
+			WriteData(fid,prefix,'object',self,'fieldname','deepwater_elevation','format','DoubleMat','mattype',3,'name','md.basalforcings.deepwater_elevation','yts',md.constants.yts)
+			WriteData(fid,prefix,'object',self,'fieldname','upperwater_elevation','format','DoubleMat','mattype',3,'name','md.basalforcings.upperwater_elevation','yts',md.constants.yts)
 		end % }}}
 	end
Index: /issm/trunk-jpl/src/m/consistency/checkfield.m
===================================================================
--- /issm/trunk-jpl/src/m/consistency/checkfield.m	(revision 22135)
+++ /issm/trunk-jpl/src/m/consistency/checkfield.m	(revision 22136)
@@ -149,5 +149,5 @@
 	lowerbound=getfieldvalue(options,'>=');
 	field2=reshape(field,prod(size(field)),1);
-	if getfieldvalue(options,'timeseries',0), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
+	if (getfieldvalue(options,'timeseries',0) | getfieldvalue(options,'singletimeseries',0)), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
 	if any(field2<lowerbound),
 		md = checkmessage(md,getfieldvalue(options,'message',...
@@ -158,5 +158,5 @@
 	lowerbound=getfieldvalue(options,'>');
 	field2=reshape(field,prod(size(field)),1);
-	if getfieldvalue(options,'timeseries',0), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
+	if (getfieldvalue(options,'timeseries',0) | getfieldvalue(options,'singletimeseries',0)), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
 	if any(field2<=lowerbound),
 		md = checkmessage(md,getfieldvalue(options,'message',...
@@ -169,5 +169,5 @@
 	upperbound=getfieldvalue(options,'<=');
 	field2=reshape(field,prod(size(field)),1);
-	if getfieldvalue(options,'timeseries',0), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
+	if (getfieldvalue(options,'timeseries',0) | getfieldvalue(options,'singletimeseries',0)), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
 	if any(field2>upperbound),
 		md = checkmessage(md,getfieldvalue(options,'message',...
@@ -178,5 +178,5 @@
 	upperbound=getfieldvalue(options,'<');
 	field2=reshape(field,prod(size(field)),1);
-	if getfieldvalue(options,'timeseries',0), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
+	if (getfieldvalue(options,'timeseries',0) | getfieldvalue(options,'singletimeseries',0)), field2=reshape(field(1:end-1,:),prod(size(field(1:end-1,:))),1); end
 	if any(field2>=upperbound),
 		md = checkmessage(md,getfieldvalue(options,'message',...
@@ -244,7 +244,12 @@
 				['field ''' fieldname ''' columns must not contain duplicate timesteps']));
 		end
-	else
-		md = checkmessage(md,getfieldvalue(options,'message',...
-			['field ''' fieldname ''' should have 2 lines']));
-	end
-end
+	elseif size(field,1)==1,
+		if size(field,2)~=1, 
+			md = checkmessage(md,getfieldvalue(options,'message',...
+				['field ''' fieldname ''' should be either a scalar or have 2 lines']));
+		end
+	else
+		md = checkmessage(md,getfieldvalue(options,'message',...
+			['field ''' fieldname ''' should have 2 lines or be a scalar']));
+	end
+end