return (grid == DNGN_SHALLOW_WATER || grid == DNGN_DEEP_WATER);

    return (grid == DNGN_SHALLOW_WATER
            || grid == DNGN_DEEP_WATER
            || grid == DNGN_WATER_RESERVED);

    DNGN_WATER_STUCK,

    DNGN_WATER_RESERVED,

    // WATER_STUCK is a placeholder for last iteration's generated water.

    // WATER_RESERVED is a placeholder for last iteration's generated water.

                     DNGN_SHALLOW_WATER, DNGN_WATER_STUCK);

                     DNGN_SHALLOW_WATER, DNGN_WATER_RESERVED);

                    int badness = count_neighbours(x, y, DNGN_WATER_STUCK);

                    int badness = count_neighbours(x, y, DNGN_WATER_RESERVED);

                         DNGN_LAVA, DNGN_WATER_STUCK);

                         DNGN_LAVA, DNGN_WATER_RESERVED);

                     DNGN_WATER_STUCK, DNGN_SHALLOW_WATER);

                     DNGN_WATER_RESERVED, DNGN_SHALLOW_WATER);