WaterClass wc1 = IsWaterTile(tile) ? GetWaterClass(tile) : WATER_CLASS_CANAL;

	if (!IsWaterTile(tile)) {
		ret = DoCommand(tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
		if (ret.Failed()) return ret;
		cost.AddCost(ret);
		cost.AddCost(_price[PR_BUILD_CANAL]);
	} else {
		if (wc1 == WATER_CLASS_CANAL && !IsTileType(tile, MP_INDUSTRY) && GetTileOwner(tile) != OWNER_NONE) {
			ret = CheckTileOwnership(tile);
			if (ret.Failed()) return ret;
		}
	}