How to Measure Precipitation in Ten Easy Steps:To make a rain gauge for the measurement of the amount of rainfall in your area receives in a week is an easy and educational project for students and ordinary persons. Rain measurement helps farmers to make decisions about irrigating crops, harvesting, and planting. It is helpful for engineers to design effective bridges, storm drains, and structures etc. Using a few household items, you can make your own gauge to measure the rainfall privately.
Follow the given steps, and you can make your own rainfall accurate measurement:
1) Put several rain gauges in different places like in a field, your back yard/schoolyard etc to see how much the measurements vary.
2) Take a tall, clear, cylindrical glass container such as a large soda or water bottle. The container should have a wide mouth to catch the rain. Should be clean the bottle thoroughly before using.
3) In case of plastic bottle, cut off its top 4 inches/10 cm then place it upside-down in the container, making a funnel to catch the rain then stick tightly with water proof tape to secure the funnel to the container.
4) Keep the rain gauge upright for accurate rain measurement. Should be place the it in a sturdy container, like a heavy bucket or a flowerpot.
5) Take a waterproof marker and a ruler, and mark a scale on your rain gauge in inches (or centimeters) on the outside of the container. Should not insert a ruler into the container, as you will probably not be able to secure it and your rain measurement will not be accurate.
6) Place your rain gauge in an open area on level surface and make sure that it is away from trees, your house, or other structures to prevent any additional water from dripping into your gauge.
7) Make sure that there are no structures close to the gauge, this may affect its ability to accurately record rainfall. For example buildings or trees which can create shadowed areas or eddies because of that rain falling does not accurately represent the actual amount that has fallen.
8) Check your rain gauge by looking at the waterline straight on, at eye level. You need to check it every day to see how much rain has fallen in the previous 24 hours. Your reading must be from the bottom of the curve for an accurate reading.
9) Make a 7 x 7 chart to mark the amount of rainfall on a graph or chart. Mark the days of the week along the top and 1 to 7 inches/2.5 to 17.8 cm along the side. When you draw a dot for each day to indicate the amount of rain you received, by using a ruler to connect the dots you will be able see the fluctuations in the rain measurement for that week.
10) After each recording empty the rain gauge or subtract reading of the previous day to ensure accuracy.