9/4/2023 0 Comments How to use google earth pro![]() To convert cubic feet (ft 3) of rainwater to gallons, multiply the cubic feet figure by 7.48. So, for our example site receiving 11.56 inches of annual rainfall, I divide 11.56 by 12 = 0.96 feet. If you are like me, you normally measure rainfall in inches, not feet, then divide inches of rain by 12 ( there are 12 inches in a foot) to get rainfall in feet. Once you have your surface areas figured out you can then calculate how much rain falls on each catchment surface area by multiplying the catchment area’s surface area by the volume of rain falling on that surface.ĬATCHMENT AREA (ft 2) x RAINFALL (ft) = TOTAL RAINWATER (ft 3) ![]() To keep the math simple, I break the catchment areas into squares, rectangles, or triangles.įor a square or rectangle, multiply its length by its width to get the surface area in square feet or square meters.įor a triangle, multiply its base by its height, then divide by 2 to get the surface area.įor examples, more clear explanations of the math, and other equations see the calculations appendix of Rainwater Harvesting for Drylands and Beyond, Volume 1, 3 rd Edition Using Google Earth Pro – to do the measuring and math for youĬheck out the video below to see how you can use Google Earth Pro to measure and calculate the surface are of your catchment areas.Ĭalculating rainfall volumes for your catchment area(s) If using metric measurements – use meters, to get your surface areas in square meters. You can use the scale on the image (see bottom left corner of image above), to measure/estimate the length (in feet) and width (in feet) of your various catchment areas to get their surface areas in square feet. Using the scale on the aerial view – a method requiring you to use a ruler and do some simple math to figure out your catchment’s surface area(s) Note: on Google Earth Pro you can rotate your view, whereas I haven’t figured out how to do so on Google Maps. As of this writing, on a laptop, you can get rid of the tilt by simultaneously hitting the Shift and U keys on your keyboard. Search on-line for how to get rid of the tilt (the method seems to change as they update the apps, or depending on what device you are using). ![]() I hate that, as you want the view from directly overhead. Look up the site on the app, choose “satellite” view, and zoom in as you like.Īs you zoom in, your view may tilt. You can use the online version of Google Maps at įor Google Earth Pro, you need to download the app onto your computer or smart phone. How to use Google Maps or Google Earth Pro to figure out a site’s rainwater catchment area(s) and rainfall incomeīy Brad Lancaster,
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