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hey. the Project is realy awesome. I have change a few things in the code (the LED blink now as long as the water level is too low and stop blinking es as soon as the water level ist enough), but you did a very good job :)
You made one little mistake (i was wondering, why 1.800.000 should bring a delay of 1h (1.800.000ms = 30 min.)). The data type of that number should not be int (int = 8bit = -32768 to 32767). I have change this to double (double = 32bit = more than enough = i dont know the name of this number :D )