Design Notebook: May 1999, Heartherridge Wetlands

The city of Tulsa, Okla., commissioned the restoration of the Heatherridge Storm Water Detention Facility after damage to natural wetlands occurred during the construction of a road.

The entire site is comprised of 22 acres, with two ponds surrounded by a suburban neighborhood. The ponds, totaling 7.7 acres in size, are divided by an access road. To maintain an equal water elevation in each pond, the ponds are connected beneath the road by drainage pipes. The project required six weeks to complete.

DESIGN CHALLENGE. The objective of this $450,000 wetland mitigation project was to transform the existing storm water detention facility into a naturalized environment that would capture storm water run-off and prevent destructive flooding common in midwestern storm showers. Another goal was to aid in filtering out environmental contaminants, thereby increasing water quality.

DESIGN SOLUTIONS. One of the first steps in creating this wetland environment was to conduct soil tests and to clean and grade all planting areas. Another initial task was to measure the water depths along the ponds’ edges since water depth is critical to the survival of aquatic plant life. All algae from the ponds was removed – much of it manually, to minimize chemical applications.

As part of the reforestation efforts, more than 3.2 acres of land surrounding the ponds were seeded, and about 1,000 whips (larger than seedling-sized trees) were installed. These new trees create a buffer around the pond edges and screen the area from the nearby residential community. Seven-foot metal T-posts with tree identifications were used to stake upright and mark the reforestation trees.

One of the largest challenges of this project was the vast amount of plant material. More than 127,000 aquatic herbaceous plants were located, purchased from five different states (with similar climate zones) and delivered by refrigerated truck and installed. Placement of these wetland materials varied according to the specific water requirements of each species. By their very nature, these materials are extremely sensitive to drying out, hence crews staggered the delivery of these items in intervals so that plant storage was minimal.

The equipment list for this flood control project was short: a small tractor with a rake attachment; a skid steer with an auger; and a boat. Thus, nearly all of the work was completed by hand, which made for a number of time-consuming tasks. The boat was the only transportation crews had to the two islands, making planning and the sequencing/scheduling of work critical. Once the planting was complete, a 9,500-linear-foot nylon twine fence was installed around the ponds and islands to keep geese out of planted areas, allowing the plants to establish.

THE RESULTS. Two years later, the dangers of stream erosion and flooding have been greatly reduced by the tremendous storage capacity of the two ponds, which slowly release water back into the local stream. Also, excess storm water run-off, which is temporarily stored there, undergoes a natural cleansing as it comes in contact with the aquatic plants. Additionally, the trees, shrubs, grasses and aquatic materials have formed an inviting habitat for numerous birds, animals and reptiles.

The author is a communications specialist at Ruppert Landscape Co., Ashton, Md.

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