public boolean buildRiver(Land land, int direction){
		land.isWeet = true;
		int x = land.x;
		int z = land.z;
		if(land.height > lakeLevel){
			if(direction == 0){
				buildRiver(world[x-1][z], direction);
			}else if(direction == 1){
				buildRiver(world[x+1][z], direction);
			}else if(direction == 2){
				buildRiver(world[x][z-1], direction);
			}else{
				buildRiver(world[x][z+1], direction);
			}
		}
		return true;
	}