| MEMBERSHIPS |
National
Utility Contractors
Association |
The Associated
General Contractors of
America (AGC) |
Georgia Utility
Contractors
Association, Inc. |
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| Stream Bank Restoration |
| Project: | Riverside Diversion Structure |
| Owner: | Gwinnett County Public Utilities |
| Location: | Gwinnett County, Georgia |
| Engineer: | Arcadis |
| Contact: | Anwer R. Ahmed, PE |
| Project Superintendent: | Donald Spinks |
| Completion Date: | October 2007 |
| Project Details: | Installation of Cross Vane and J-Hook structures for the purpose of directing storm run-off into man made flood plain storage area. The installation of field stone and granite foundation stone for use on project was the original work scope. Due to settlement of stones during construction into soft soil, a field modification was made. Sheet piles were driven approximately 12 feet deep (to resistance) in order to support stone structures. Structures were then built upon the sheet piles. |
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| Before this site was developed, water flowing under Riverside Drive through these three culverts entered a county-owned flood plain area. |
An attractive natural space emerged after development, which included walking trails, ponds and carefully-selected plantings. |
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| The principal control and diversion structures are the Cross Vane and Wier which create this small pool. Water entering the site is first collected in this small pool, and then gently flows out through one of two channels. |
The Cross Vane is one of the spillways out of the pool. The boulders and rocks not only stabilize the structure, but help clean and areate the water flowing over them, enhancing the habitat for the fish living in this stream. |
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| On the Wier side of the pool, water trickles over a spillway, passes under a foot bridge and enters the first of a series of small flood control collection ponds, which also form habitat for wildlife. |
Park managers can implement additional devices to further control water flow, such as the mechanism visible here. Slots on the sides of the boulders on either side of the channel can hold heavy wooden boards in place, further controlling water levels during high runoff. |
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| Resistance against erosion is critical for the success of this structure. Looking back from under the bridge, we see not only this intriguing and beautiful perspective, but the 2000-pound boulders making up the Wier. |
Both the county authority responsible for its development, and the residents and wildlife who will enjoy its use, benefit from the many sustainable solutions employed throughout the site. |
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