diff --git a/flow_bc.c b/flow_bc.c
new file mode 100644
index 00000000..b0a3a62e
--- /dev/null
+++ b/flow_bc.c
@@ -0,0 +1,45 @@
+#include <stdlib.h>
+
+#include "flow_bc.h"
+
+
+/* ---------------------------------------------------------------------- */
+flowbc_t *
+allocate_flowbc(size_t nf)
+/* ---------------------------------------------------------------------- */
+{
+    size_t    i;
+    flowbc_t *new;
+
+    new = malloc(1 * sizeof *new);
+    if (new != NULL) {
+        new->type  = malloc(nf * sizeof *new->type);
+        new->bcval = malloc(nf * sizeof *new->bcval);
+
+        if ((new->type == NULL) || (new->bcval == NULL)) {
+            deallocate_flowbc(new);
+            new = NULL;
+        } else {
+            for (i = 0; i < nf; i++) {
+                new->type [i] = UNSET;
+                new->bcval[i] = 0.0;
+            }
+        }
+    }
+
+    return new;
+}
+
+
+/* ---------------------------------------------------------------------- */
+void
+deallocate_flowbc(flowbc_t *fbc)
+/* ---------------------------------------------------------------------- */
+{
+    if (fbc != NULL) {
+        free(fbc->bcval);
+        free(fbc->type );
+    }
+
+    free(fbc);
+}
diff --git a/flow_bc.h b/flow_bc.h
new file mode 100644
index 00000000..bd8598ce
--- /dev/null
+++ b/flow_bc.h
@@ -0,0 +1,20 @@
+#ifndef FLOW_BC_H_INCLUDED
+#define FLOW_BC_H_INCLUDED
+
+#include <stddef.h>
+
+enum flowbc_type { UNSET, PRESSURE, FLUX };
+
+typedef struct {
+    enum flowbc_type *type;
+    double           *bcval;
+} flowbc_t;
+
+
+flowbc_t *
+allocate_flowbc(size_t nf);
+
+void
+deallocate_flowbc(flowbc_t *fbc);
+
+#endif  /* FLOW_BC_H_INCLUDED */