Monday, April 21, 2014

Fayetteville sets rules to manage stormwater runoff to Pye Lake


By Josh Akeman

Fayetteville city council voted unanimously at last Thursday's meeting to approve a staff recommendation to establish the Pye Lake Southern Tributary Special Watershed District and place requirements on any future developers to account for increased stormwater runoff water flows.
Director of Public Services Chris Hindman explained that approximately 362 acres of property has drains into Pye Lake's southern tributary, and the flows of stormwater have increased since the development of
the Villages residential community which sits at the northwest end of the basin.
The basin extends southeast through downtown Fayetteville to Grady Avenue in the south and as far as Johnson Avenue to the east. Hindman explained that many of the properties in this area did not have the sort of detention pond requirements that developments have today, so most of the flow is feeding directly into the Pye Lake's southern tributary.
Hindman said that given that the area around the Villages is one of the city's most likely locations for future development it was wise to get out ahead of the matter.
"There's no flooding or anything we're just trying to take a proactive approach in this particular basin," Hindman said, "What it would mean in laymans terms is they would have to have more onsight storage [detention ponds] for any new development."
In particular developers will be required to do most extensive Pre-Design evaluation of the watershed and downstream analysis which will come before the city for review.
"In the predevelopment phase design of a project we will require a developer to analyze downstream points, like where it goes under the road and where it hits Pye Lake. We'll make them analyze their impact on those points and we will not allow any increased flows at those points especially at Highway 54 and Pye Lake.
In his memo to council, Hindman explained that a Dec. 2012 analysis found that development of the Villages subdivision had increased stormwater flows "from 21.37 cubic feet per second to 149.34 cubic feet per second at peak flow rate at the watershed outlet."
The report also found the estimated runoff volume had nearly tripled from about 412 cubic feet to about 1,172 cubic feet.
The report estimated that if remaining properties "are developed with the current zoning and land use classifications we estimate the potential Future Land Use conditions will be 197.96 cubic feet per second peak flow rate at the watershed outlet and will be an increase of 48.62 cubic feet per second over the 2010 Land Cover flow rates. The estimated runoff will increase to 1,761,036 cu ft and will be an increase of 588,544 cubic feet from the 2010 Land Cover flow rates."
The new requirements will put the onus on developers to create detention ponds so that no discharge is added at any of the "required analysis points" and also that "discharge onto neighboring properties must be reduced to eighty percent of the pre-development discharge rate."


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