Naturalized Stormwater Basin

Naturalized Stormwater Basin

In 2005, this area was transformed from a drainage basin to habitat for native plants and animals through the diligence and creativity of Ursinus students. 


The site of the basin is a three-acre detention basin, constructed in 2001 on the north-west end of campus. Stormwater from a 38-acre watershed culminates in the three-acre basin. This watershed includes the parking lot located on the west side of campus, the College’s performing arts center, baseball field, field hockey field, tennis courts, a large dorm complex, and the gymnasium complex.


The Naturalized Stormwater Basin started out as a sedimentation basin that was created during the construction of new buildings on campus. Erony Whyte, an Environmental Studies alumna (class of 2005), began researching the sedimentation basin as a Summer Fellows project in 2004. From her research, she proposed the creation of an extended detention wet pond - an extended detention basin is a basin that releases water more slowly than a regular pond whether the pond is dry or wet. A wet pond maintains a permanent pool of water at a certain level; compared to a dry pond which is a grass basin that collects storm water and gradually drains it. Erony’s final proposal of an extended detention wet pond stemmed from the fact that extended detention wet ponds filter pollutants much better than other basins. Extended detention dry ponds provide sediment removal and some pollutant removal during storms. Regular detention wet ponds provide sediment removal and inexpensive, low-maintenance, and effective wastewater treatment capable of treating high pollutant loads and fluctuating hydrology. Extended detention wet ponds are more effective than regular detention wet ponds in providing these functions. They offer all of these with additional benefits of aesthetics, habitat creation, recreation and education.

The original basin was designed for the collection of sediments from land exposed due to construction. A 1987 statute entitled National Pollution Discharged Elimination System, an amendment to the Clean Water Act, required industrial and electrical facilities, as well as construction sites greater than five acres to regulate and monitor effluent limits in a collection basin. The College’s plan was to transform this sedimentation basin into a wet pond upon the completion of construction.

Erony’s proposal was to retrofit the existing basin into an extended detention wet pond. Her goals were as follows:
Maintain basin’s utilitarian function of retaining 100-year storm levels Use native plants that are beneficial to water quality and wildlife Create an aesthetically pleasing open space Foster educational and recreational opportunities that support campus Master Plan Reduce maintenance requirements for Physical Plant Provide cost-effective design.  The underlying goal of the extended detention wet pond was to filter out pollutants collected in storm water runoff, including oil, grease, and heavy metals from developed surfaces and excess nitrogen, phosphorous (e.g. from fertilizers, sediment), and pesticides from grass surfaces. The west end parking lot that houses the majority of the students’ vehicles is a major contributor of pollutants in the College’s storm water run-off.

The extended detention wet pond serves as the filter by slowing the flow of flood water, desynchronizing the peak contributions of tributary streams, and reducing peak flows on main rivers. The wet ecosystem improves the water quality of the Perkiomen Creek, into which the College’s storm water eventually drains. The Perkiomen Creek is a tributary of the Schuylkill River and has a 372 square mile watershed. The Schuylkill feeds into the Delaware River and ultimately the Atlantic Ocean.

The extended detention wet pond will filter pollutants by having the vegetation remove pollutants through physical and biochemical processes. This filtered water will be drained into the Perkiomen Creek, approximately one-thousand and three-hundred feet from the drainage basin. The best filtration is conducted with native species to the ecosystem. Native plants are best adapted to growing and breaking down pollutants in an ecosystem and thereafter will attract native wildlife.

Plants that are used to treat water pollution are called phytotechnology. A wet pond is a specific phytotechnology that provides multiple benefits for the storm water, wildlife, and the people that live near the pond. Working with environmental engineering firm F.X. Browne, Erony created blueprints of the proposed wet pond, as well as a planting plan.

The final proposal of the extended detention pond included three zones. Zone one only comes into contact with storm water when levels are high; zone two is partially submerged or in high levels completely inundated with water; the final zone is relatively deep, at the lowest elevations. These three zones are crucial for ecosystem construction and viability. Other zones within the pond and upland areas will vegetate naturally with hardy volunteer species.
The naturalized stormwater basin is a project has taken many years to complete, several plantings, and dedication by students, faculty and staff. The basin is a natural, harmonious space on campus enhances the life of every student, faculty, staff, and community member that comes in contact with it.