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Allen Brook

Allen Brook. ENSC 285 Final Presentation 4.29.2005 Keith Jennings. Allen Brook Watershed. 37.5km2 3750ha Headwaters in Williston Mouth in South Burlington Intersects Muddy Brook before draining into the Winooski River. Allen Brook Subwatersheds.

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Allen Brook

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  1. Allen Brook ENSC 285 Final Presentation 4.29.2005 Keith Jennings

  2. Allen Brook Watershed • 37.5km2 • 3750ha • Headwaters in Williston • Mouth in South Burlington • Intersects Muddy Brook before draining into the Winooski River

  3. Allen Brook Subwatersheds • 12 Subwatersheds for the main stem’s 12 reaches • No tribs because no other streams contribute 10% to Allen Brook

  4. Allen Brook Land Cover

  5. Allen Brook Land Cover • Agriculture more common at upstream reaches • More urban and suburban cover at downstream reaches • Residential land occupies 6 times more space in reach M01 than in M12 • Forest cover is highest in the middle reaches • Total impervious cover for watershed is only 6.4%

  6. Allen Brook Soils

  7. Allen Brook Soils • Reaches M05 and M02 indicate frequent water table flooding. Can be a large problem for residences in the area. Both of those reaches are about 25% residential land. • Many of the soil hydrogroups are classified as ‘D’, which is a fairly impermeable soil type. Can lead to runoff issues during large storm events.

  8. Scenes in Allen Brook

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  21. Conclusions • Allen Brook is impacted by suburban development pressures in its downstream reaches • Agriculture has a large impact on the brook in upstream reaches • Culverts and berms are impacting where the stream can flow • Its natural pattern is being altered

  22. Conclusions • What do we do now? • Talk to developers and landowners • Development pressure in Williston will surely increase in the future • We should encourage developers to build away from sites in the watershed that will have an effect on channel morphology and stay away from sites that experience frequent flooding • Talk to farmers in upstream reaches and encourage them to let the stream return to its natural, unstraightened path • Encourage BMP’s in Williston to mitigate stormwater effects on Allen Brook

  23. Conclusions • Focus on higher impact reaches • Reaches M07, M08, M09 and M11 have been straightened • Downstream reaches are being encroached upon by suburban development • Look at mitigating impacts of development

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