Urban Stream Syndrome

hipwader

Reedy Creek suffers from Urban Stream Syndrome.   

You can help!

Nitrogen and phosphorus are nutrients that are found naturally in the environment.  However, a lot of human activities create excesses of these nutrients.   For example, the fertilizers you might put on your lawn or garden or the detergent you use to wash your car each probably contain nitrogen and phosphorus in some form.  Pet waste contains nitrogen and phosphorus too.  When these things wash into stormwater drains, they ultimately end up in our creeks and steams.   There, either of two things can happen.  If it‘s just a little bit of nutrients, and the water flows slowly through the environment, plants and microbes can take care of the nutrients, changing them into forms that are harmless to the environment.

Unfortunately, a lot of streams in our cities suffer from “Urban Stream Syndrome”.  This could mean that the water does not flow slowly (maybe it’s been channelized) or that the amount of nutrient input is just too much for the plants and microbes to handle.  Those nutrients ultimately end up in our nation’s coastal areas, including the Chesapeake Bay.  Here, those excess nutrients affect the habitability of the water for other species by causing harmful algal blooms and “dead zones” of water with low oxygen.

Over several months during Fall 2016, students from the University of Richmond studied Reedy Creek for a Microbial Ecology class.  They found that the creek shows a lot of the characteristics of urban stream syndrome, including high numbers of indicator bacteria, high nitrogen levels, and low levels of dissolved oxygen.  However, they also found that after the water passed through Crooked Branch Ravine Park and approached its merger with the James River, levels of at least one chemical containing nitrogen (nitrate) declined to a normal level.  What this means is that the microbes and plants in the park were doing their job!

Within urban environments, natural areas can provide us with “ecosystem services” like reducing nutrients in stormwater.  It’s up to us, however, to make sure we don’t overwhelm the system. We can do this by planting rain gardens that absorb stormwater, picking up pet waste, and by thinking about what we let wash into the storm drains.  We can also advocate for sensible and forward-thinking urban planning that incorporates as much nature as possible

Dr. Amy Treonis, Associate Professor of Biology, University of Richmond

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The Hip Waders Journal is a series of posts about watershed issues with suggestions for how to improve water quality and support the local ecosystem right from your own yard.  Click the link for easy access to all posts.

 

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