Small streams are threatened by urbanization, logging, and agriculture. Scientists have uncovered evidence that makes stream more important in land-use policies.
"Nitrogen runoff into waterways has become an escalating environmental problem over the last 50 years, but a recent study found that small streams are extremely efficient at removing excess nitrogen?as much as half of the nitrogen that enters them...Land-use policies up until now have focused on terrestrial solutions for inhibiting nitrogen pollution...[w]hat this study shows is that we can reduce the amount of nitrogen that is being carried downstream by maintaining streams and wetland areas."
Thanks to Abhijeet Chavan
FULL STORY: Streams Reduce Nitrogen Pollution, Scientists Find

Planetizen Federal Action Tracker
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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
New York City School Construction Authority
Village of Glen Ellyn
Central Transportation Planning Staff/Boston Region MPO
Institute for Housing and Urban Development Studies (IHS)
City of Grandview
Harvard GSD Executive Education
Regional Transportation Commission of Southern Nevada
Toledo-Lucas County Plan Commissions