Index: trunk/styles/standard/elemstyles.mapcss
===================================================================
--- trunk/styles/standard/elemstyles.mapcss	(revision 13979)
+++ trunk/styles/standard/elemstyles.mapcss	(revision 14050)
@@ -1394,4 +1394,8 @@
     width: 2;
     color: manmade#d8d8d8;
+}
+way[man_made=dyke] {
+    width: 2;
+    color: dyke#0aa846;
 }
 node[man_made=lighthouse] {