When rainfall is less than normal for a period of weeks to years, streamflows decline, water levels in lakes and reservoirs fall, and the depth of water in wells increases. If dry weather persists and water supply problems develop, the dry period can become a drought An understanding of environmental science can lead to solutions. How can something is fixed if no one knows what's wrong? We can try to get everyone to realize there is a problem. There will also have to be sacrifices made.