Install a rain barrel this spring and use the water to irrigate your landscaping throughout the summer

During a rainstorm, rainwater seeps into the ground until the ground is saturated and the remaining water runs off into drains and ultimately streams and rivers.  With the increase in impervious surfaces in cities, less water infiltrates during a storm.  The increase in runoff can overwhelm the storm sewer system and cause local flooding.  Harvesting rainwater using a rain barrel reduces the harmful effects of runoff, and on-site use of captured rainwater reduces water treatment needs and reduces the use of potable water for residential needs. 
 
For more information refer to the following links:
Pennsylvania Department of Environmental Protection (http://www.elibrary.dep.state.pa.us)
http://www.dauphincd.org/swm/bmptour.html
http://www.dnr.state.md.us/sustainability/rain_barrel.asp