http://www.helium.com/knowledge/255812-what-is-the-reason-that-rivers-are-straightened-and-what-is-the-effect-on-the-environment.xml Helium.com > Ecology & Environment > What is the reason that rivers are straightened, and what is the effect on the environment? en-us Copyright Helium.com Thu, 24 Sep 2009 13:08:42 GMT Thu, 24 Sep 2009 13:08:42 GMT