--- a/src/water_cmd.c	Wed Jan 03 23:55:37 2007 +0000
+++ b/src/water_cmd.c	Thu Jan 04 01:10:39 2007 +0000
@@ -252,7 +252,7 @@
 		cost += ret;
 
 		if (flags & DC_EXEC) {
-			if (TileHeight(tile) == 0) {
+			if (TileHeight(tile) == 0 && HASBIT(p2, 0)) {
 				MakeWater(tile);
 			} else {
 				MakeCanal(tile, _current_player);