CoCoRaHS (The Community Collaborative Rain, Hail and Snow Network) a simple, low-cost national volunteer precipitation monitoring network is now in it's fifteenth year. It has become the largest single source of daily precipitation measurements in the country. Our motto is "Because every drop counts!" Each day citizens from all fifty states and parts of Canada take backyard observations of precipitation and report them via the CoCoRaHS web site. With over 19,000 volunteers this high quality data set is used by hundreds of organizations from the National Weather Service to local county stormwater entities. CoCoRaHS's high resolution monitoring helps better capture and document the frequency, timing and geographic distribution of extreme events.
During the past several years many observers have filed reports of drought impacts. These reports contribute to the US Drought Monitor, which plays a role influencing policy and decision making. Finally, the 'up' side of the water cycle is being reported by numerous CoCoRaHS volunteers. Reference evapotranspiration, which paints a picture of a community's water balance, is now being reported along with daily precipitation observations.Find out more about the network, how it relates to rainwater harvesting and how you can participate and contribute to helping map the nation's rainfall. Network membership is free and all that's required is the purchase of a 4" diameter high quality plastic rain gauge for around $30.
Even if you don't participate you can view and learn about the rain that has fallen in your community. Want to go further? As mentioned above, some volunteers are even observing how much of that rainfall is going back into the atmosphere by measuring Reference Evapotranspiration. During our presentation will talk about the network, it's history, why measuring rainfall is important and the many opportunities that exist for you to participate.