Index: /issm/trunk-jpl/src/c/analyses/HydrologyDCEfficientAnalysis.cpp
===================================================================
--- /issm/trunk-jpl/src/c/analyses/HydrologyDCEfficientAnalysis.cpp	(revision 16903)
+++ /issm/trunk-jpl/src/c/analyses/HydrologyDCEfficientAnalysis.cpp	(revision 16904)
@@ -97,5 +97,85 @@
 /*Finite Element Analysis*/
 ElementMatrix* HydrologyDCEfficientAnalysis::CreateKMatrix(Element* element){/*{{{*/
-	_error_("not implemented yet");
+
+	/*Intermediaries*/
+	int      meshtype;
+	Element* basalelement;
+
+	/*Get basal element*/
+	element->FindParam(&meshtype,MeshTypeEnum);
+	switch(meshtype){
+		case Mesh2DhorizontalEnum:
+			basalelement = element;
+			break;
+		case Mesh3DEnum:
+			if(!element->IsOnBed()) return NULL;
+			basalelement = element->SpawnBasalElement();
+			break;
+		default: _error_("mesh "<<EnumToStringx(meshtype)<<" not supported yet");
+	}
+
+	/*Check that all nodes are active, else return empty matrix*/
+	if(!basalelement->AllActive()) return NULL;
+
+	/* Intermediaries */
+	IssmDouble  D_scalar,Jdet,dt;
+	IssmDouble  epl_thickness;
+	IssmDouble *xyz_list = NULL;
+
+	/*Fetch number of nodes and dof for this finite element*/
+	int numnodes = basalelement->GetNumberOfNodes();
+
+	/*Initialize Element vector*/
+	ElementMatrix* Ke     = element->NewElementMatrix();
+	IssmDouble*    B      = xNew<IssmDouble>(2*numnodes);
+	IssmDouble*    basis  = xNew<IssmDouble>(numnodes);
+	IssmDouble     D[2][2]={0.};
+
+	/*Retrieve all inputs and parameters*/
+	basalelement->GetVerticesCoordinates(&xyz_list);
+	basalelement->FindParam(&dt,TimesteppingTimeStepEnum);
+	Input* thickness_input=element->GetInput(HydrologydcEplThicknessEnum); _assert_(thickness_input);
+	IssmDouble epl_specificstoring = EplSpecificStoring(basalelement);
+	IssmDouble epl_conductivity    = element->GetMaterialParameter(HydrologydcEplConductivityEnum);
+
+	/* Start  looping on the number of gaussian points: */
+	Gauss* gauss=element->NewGauss(2);
+	for(int ig=gauss->begin();ig<gauss->end();ig++){
+		gauss->GaussPoint(ig);
+
+		element->JacobianDeterminant(&Jdet,xyz_list,gauss);
+		thickness_input->GetInputValue(&epl_thickness,gauss);
+
+		/*Diffusivity*/
+		D_scalar=epl_conductivity*epl_thickness*gauss->weight*Jdet;
+		if(dt!=0.) D_scalar=D_scalar*dt;
+		D[0][0]=D_scalar;
+		D[1][1]=D_scalar;
+		GetB(B,element,xyz_list,gauss); 
+		TripleMultiply(B,2,numnodes,1,
+					&D[0][0],2,2,0,
+					B,2,numnodes,0,
+					&Ke->values[0],1);
+
+		/*Transient*/
+		if(dt!=0.){
+			element->NodalFunctions(basis,gauss);
+			D_scalar=epl_specificstoring*epl_thickness*gauss->weight*Jdet;
+
+			TripleMultiply(basis,numnodes,1,0,
+						&D_scalar,1,1,0,
+						basis,1,numnodes,0,
+						&Ke->values[0],1);
+		}
+	}
+
+	/*Clean up and return*/
+	xDelete<IssmDouble>(xyz_list);
+	xDelete<IssmDouble>(basis);
+	xDelete<IssmDouble>(B);
+	delete gauss;
+	return Ke;
+
+
 }/*}}}*/
 ElementVector* HydrologyDCEfficientAnalysis::CreatePVector(Element* element){/*{{{*/
@@ -200,2 +280,29 @@
 	return rho_freshwater*g*epl_porosity*(water_compressibility+(epl_compressibility/epl_porosity));		 
 }/*}}}*/
+void HydrologyDCEfficientAnalysis::GetB(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss){/*{{{*/
+	/*Compute B  matrix. B=[B1 B2 B3] where Bi is of size 3*NDOF2. 
+	 * For node i, Bi can be expressed in the actual coordinate system
+	 * by: 
+	 *       Bi=[ dN/dx ]
+	 *          [ dN/dy ]
+	 * where N is the finiteelement function for node i.
+	 *
+	 * We assume B has been allocated already, of size: 3x(NDOF2*numnodes)
+	 */
+
+	/*Fetch number of nodes for this finite element*/
+	int numnodes = element->GetNumberOfNodes();
+
+	/*Get nodal functions derivatives*/
+	IssmDouble* dbasis=xNew<IssmDouble>(2*numnodes);
+	element->NodalFunctionsDerivatives(dbasis,xyz_list,gauss);
+
+	/*Build B: */
+	for(int i=0;i<numnodes;i++){
+		B[numnodes*0+i] = dbasis[0*numnodes+i];
+		B[numnodes*1+i] = dbasis[1*numnodes+i];
+	}
+
+	/*Clean-up*/
+	xDelete<IssmDouble>(dbasis);
+}/*}}}*/
Index: /issm/trunk-jpl/src/c/analyses/HydrologyDCEfficientAnalysis.h
===================================================================
--- /issm/trunk-jpl/src/c/analyses/HydrologyDCEfficientAnalysis.h	(revision 16903)
+++ /issm/trunk-jpl/src/c/analyses/HydrologyDCEfficientAnalysis.h	(revision 16904)
@@ -27,4 +27,5 @@
 
 		/*Intermediaries*/
+		void GetB(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
 		IssmDouble EplSpecificStoring(Element* element);
 };
Index: /issm/trunk-jpl/src/c/classes/Materials/Matpar.cpp
===================================================================
--- /issm/trunk-jpl/src/c/classes/Materials/Matpar.cpp	(revision 16903)
+++ /issm/trunk-jpl/src/c/classes/Materials/Matpar.cpp	(revision 16904)
@@ -259,4 +259,6 @@
 		case HydrologydcEplPorosityEnum:             return this->epl_porosity;
 		case HydrologydcEplCompressibilityEnum:      return this->epl_compressibility;
+		case HydrologydcEplConductivityEnum:         return this->epl_conductivity;
+		case HydrologydcEplInitialThicknessEnum:     return this->epl_init_thickness;
 		case HydrologydcWaterCompressibilityEnum:    return this->water_compressibility;
 		case HydrologydcSedimentTransmitivityEnum:   return this->sediment_transmitivity;