Water quality and wetland vegetation responses to water level variations in a university stormwater reuse reservoir: Nature-based approaches to campus water sustainability

• Published in: The Science of the total environment 2024-10, Vol.948, p.174616, Article 174616
• Main Authors: Richardson, Curtis J., Flanagan, Neal E.
• Format: Article
• Language: English
• Subjects: base flow; cooling; ecological succession; environment; Environmental Monitoring; habitats; indigenous species; introduced species; Jordan; lakes; littoral zone; Nature-based solutions; Nitrogen; Nitrogen - analysis; oxygen; Phosphorus; Phosphorus - analysis; Plant succession; Plants; Rain; sediments; Self-design; species; storms; stormwater; surveys; temperature; total nitrogen; total phosphorus; Universities; vegetation; Water level; Water Quality; water reuse; Water Supply; watersheds; Wetlands
• ISSN: 0048-9697; 1879-1026; 1879-1026
• DOI: 10.1016/j.scitotenv.2024.174616

In response to climate-driven water shortages, Duke University in 2014 constructed a water reuse reservoir and wetland complex (Pond) to capture urban stormwater and recycle water to provide campus cooling and reduce downstream loading of nutrients and sediment into Jordan Lake, a regional water supply. We postulated that even with significant water level changes due to withdrawals, the Pond would function to reduce downstream nutrients and sediment once wetland plants became established in the littoral zone. Throughout the project (2015–2021), baseflow nutrient concentrations downstream decreased, with Unfiltered Total Nitrogen (UTN) falling by 44 % and Unfiltered Total Phosphorus (UTP) by 50 %. Storm mean concentrations decreased by 31 % for UTN, 54 % for UTP, and 72 % for Total Suspended Solids (TSS). The annual reductions in mass fluxes (UTN, UTP, and TSS) were between 58 and 85 % across a range of storm intensities. Regardless of water level, temperature, pH, and oxygen concentrations downstream were not significantly changed. Between 2015 and 2020, a littoral survey of planted and naturally introduced species showed that wetter years resulted in a greater number of species across a gradient of three inundation zones (i.e., moist, wet, and aquatic). Conversely, dryer years resulted in fewer species across overlapping zones. The dominant plants that successfully colonized the Pond are all obligate wetland species despite the Pond's highly variable water depths and periods of inundation. The final plant populations were dominated by invasive native species supporting the self-design theory of plant succession as nearly half of the original planted species died. The reuse Pond design (pond-wetland complex) showed the capability of using stormwater runoff for campus cooling while improving water quality services and providing habitat for wetland plants. Thus, campuses with watershed runoff capture capability should consider a nature-based recycling approach as part of their water sustainability program. [Display omitted] •A campus water reuse reservoir & wetland complex was designed as part of a university water sustainability system to reduce water use & pollution.•The annual mass flux reductions in N, P and TSS were between 51 and 85 percent across a range of storm intensities and reservoir water levels.•Fluctuations in reservoir water levels due to H2O withdrawals for cooling did not affect water quality, temperature, and O2 concentrations downstream.•