How to make a cheap Rain Gauge

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Read this nice blog about How to make a cheap Rain Gauge. Rainfall measurement is very helpful in understanding the weather around you. For example if you want to harvest rainwater, understanding rainfall patterns and quantities helps to get a good design for the storage and recharge. Here is how you can make a cheap rain gauge and start putting it to use this monsoon. http://rainwaterharvesting.wordpress.com/2013/06/08/how-to-make-a-cheap-rain-gauge/ You need a 1 litre or a 2 litre PET or PVC bottle. The bottle should have a flat base and be vertical for the most part.