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Archive for the ‘Why We Need Clean Streams’ Category

 

This begins 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.

We hope you will enjoy

hipwader

Our Reedy Creek logo is very simple, but says a lot about what we think is important.

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The leaf over the top represents canopy as well as understory shrubs and trees, perennials, and other plants.  A healthy canopy, composed primarily of species native to the area, protects streams, improves water quality,  cools the air in summer, and provides life support services for animals from insects to mammals.

The blue at the bottom represents the stream, of course.  A healthy stream should be clear, not muddy; rocky streams such as our should have clean bottoms with little silt and should be free of obvious green algae during warm weather

The stonefly in the middle represents what’s missing from Reedy Creek because of human activity.  This insect lives in water during its nymphal stage* and requires good water quality to survive.  We have changed the entire ecology of the stream!

nymph is the immature form of some invertebrates, particularly insects, which undergoes gradual metamorphosis  before reaching its adult stage.

Please stay tuned for more! 

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Erosion and sedimentation are natural processes that occur with stream flow.  Gravel and cobble-sized sediments are very important as habitat for stream-bottom macroinvertebrates, such as the larvae of caddisflies and stoneflies, and as spawning habitat for fish.  But too much sediment can cause problems. For example, sand and finer grained sediment, including silts and clays, can degrade gravel and cobble habitats.

The effect of too much fine sediment on a stream can be illustrated by the following pictures.

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This first picture shows cobble-sized sediments.  Light and air can filter through to the streambed allowing macroinvertebrates and other aquatic life to thrive.

“Bad Sediment” Stream Bed is Smothered

This second picture shows a streambed that has literally been smothered by fine sediment.   Light and air cannot filter through to the streambed and macroinvertebrates and other aquatic wildlife such as small fishes cannot utilize the small spaces between sediment particles.  The source of this fine sediment can be runoff from roofs and lawns, as well as development, in urban areas.  When such runoff reaches storm drains, it is discharged directly into our waterways.

Sometimes particles carried in urban runoff can be too fine to settle to the bottom.  Because of their small size, such particles often float throughout the water and can be carried all the way to the Chesapeake Bay. Once in the Bay, cloudy water does not allow sunlight to filter through to grasses growing on the bottom.  Bay grasses need sunlight to grow; without it, these grasses die. This is turn affects the young fish and blue crabs that depend on bay grasses for shelter. Excess sediment suspended in the water is one of the leading causes of the Chesapeake Bay’s poor health.

Your landscape can have an impact on local ecosystems and further downstream.  Take these steps to reduce sediment in our streams:

  • Reduce the amount of stormwater that leaves your property.
  • Plant native trees and shrubs, especially where erosion is a problem.
  • Sign up for a free watershed protection audit.  We can help you find ways to reduce your watershed footprint.  We will also be glad to talk to you about our Financial Incentive Program.

Sources and More Information:

http://www.swrcb.ca.gov/water_issues/programs/nps/docs/protocols_sediment_factsheet.doc http://www.chesapeakebay.net/sediments.aspx?menuitem=14691

http://www.muddywaterwatch.org/faq/why_sediment_bad_rivers

http://www.krisweb.com/stream/sediment.htm

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