Building a rain gauge to measure the amount of rain your area receives in a week is an easy and educational project for children and adults. Rain measurement helps farmers and others make decisions about planting, harvesting, and irrigating crops; it also enables engineers to design effective storm drains, bridges, and other structures. By using a few household items and the steps below, you can make your own gauge to measure the rainfall in your neighborhood.
Follow the steps in: http://www.wikihow.com/Measure-Rain
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