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Watershed Management : Instream Impacts   



General information on Blue Green Algae in Florida

What is Blue Green Algae, why is it there, what problems does it cause? This is a great brochure for public education.



Impact of River Channelization on Seismic Risk: Shelby County, Tennessee
The lower 35.4 km of the Wolf River, in the city of Memphis, Shelby County, Tennessee, was channelized in 1964 to reduce flooding. Detailed channel surveys conducted in 1959 and 1990 document river and floodplain changes 26 years after channelization. Channelization resulted in a straighter, steeper, deeper, wider, and smoother channel, thus causing an increase in channel velocity, cross-sectional area, and discharge capacity. Subsequent to channelization, Wolf River became shallower near its mouth, entrenched 3 m in its upstream reach, and formed a nick point at the eastern end of the channelized reach that migrated 11.3 km upstream. Tributaries to the channelized segment of the Wolf River have also entrenched. In addition, the floodplain along the channelized reach underwent dissection and denudation and the banks of the Wolf River were an average of 1 m lower in elevation than they were in 1959. Channelization and subsequent river changes have reduced flooding in the channelized portion of the river as intended. However, negative consequences of these river changes include (1) costly bridge and pipeline repair, (2) river and wetlands habitat destruction, (3) probable increased susceptibility for earthquake liquefaction and associated lateral spreading of the Wolf River floodplain, and (4) increased earthquake risk due to building development on the Wolf River floodplain.

Montgomery County, MD Green Infrastructure Plan
This website displays the Green Infrastructure Functional Master Plan with the following goals: Provide a policy guide for development and zoning decisions; help guide master plans; provide a planning tool to help improve water quality; realize forest protection goals; increase the potential for state funding of open space preservation; and support the desired development pattern identified in the county's General Plan and facilitate smart growth.


Montgomery County, MD Special Protection Areas for Streams
The streams in Montgomery County, including those found in parkland, on private property, or elsewhere in the neighborhood, are an important part of the natural resources of the county. A healthy stream provides recreational, natural, and aesthetic benefits. Over 1500 miles of streams in Montgomery County provide habitat to our rich and diverse aquatic life and water-dependent wild life. A healthy stream contributes to good drinking water and helps protect the Chesapeake Bay.


Nonpoint Education For Municipal Officials
The program uses GIS maps, aerial photography and satellite imagery to illustrate the connection between land use and water quality in a particular community or watershed. NEMO is designed to help local land-use decision makers deal with the complexities of nonpoint source water pollution. (Four SE states are developing NEMO programs: AL, GA, SC and TN.)

On Farm Assessment and Environmental Review (OFAER)
The On Farm Assessment and Environmental Review (OFAER) project provides livestock producers a confidential, comprehensive and objective assessment of water quality, odor and pest risk factors at their operations.

RELATIONSHIP OF FOREST DESTRUCTION AND SOIL DISTURBANCE TO INCREASED FLOODING IN THE SUBURBAN NORTH CAROLINA PIEDMONT
A research study was conducted to determine the significance of soil disturbance, urban vegetation and infiltration in suburban stormwater management. A considerable amount of suburban land is commonly denuded and soil sufficiently disturbed to produce a marked increase in downstream flooding. Sensitive land use planning can significantly reduce the amount of tree destruction and soil disturbance during urban development. Reclamation of disturbed sites through urban soil and tree management has the potential to significantly increase the low infiltration conditions thereby reducing the volume of stormwater runoff.

STREAM CHANNELIZATION IN THE DOG RIVER WATERSHED, AL
Two common reasons for stream modification in the Dog River Watershed are to control flooding and erosion. Channelization activities within the study area include bank clearing, riprapping, gabions, widening, deepening, realignment, and lining. These stream modifications impact the stream's physical, chemical, and biological characteristics. This study focuses on stream flow (volume and rate), dissolved oxygen, water temperature and observed biological characteristics in an attempt to relate water quality and stream channelization.

Urbanization and Streams EPA Case Studies
The following case studies demonstrate the impacts that increased flow due to urbanization can have on urban streams. Like urban streams, each case study is unique. The case studies look at different attributes such as habitat, stream stability, and sedimentation. In some cases, where field data did not quantify the impacts, models were applied to estimate impacts. When available, cost information related to the impacts and restoration is included. Southeast case studies include:
Holmes Run Watershed - Fairfax County/Falls Church, Virginia
Peachtree Creek - Atlanta, Georgia
Atlanta Metropolitan Area - Dekalb County, Georgia
Various Streams - North Carolina Piedmont

Urbanization and Streams: Studies of Hydrologic Impacts
Hydrologic impacts due to urbanization are reported to cause water quality problems such as sedimentation, increased temperatures, habitat changes, and the loss of fish populations. Although there is widespread recognition that these problems are caused by increased runoff volumes and velocities from urbanization and associated increases in watershed imperviousness, much of the reported information has been anecdotal. The summaries and analyses of reports and case studies in this report are intended to go beyond the anecdotal and provide documentation of problems and sources, as well as a foundation for further investigation.


 
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