NASA researchers are utilizing satellite and ground-base observations of precipitation to formulate data that will better water quality. Currently data is based strictly on meteorological statistics of precipitation from weather stations. This new method was tested and is shown to be more effective in enhancing the nature of water. NASA is looking to expand this model to areas of the world without adequate weather observation.
http://www.sciencedaily.com/releases/2010/07/100726084743.htm