Modeling multi-year phosphorus dynamics in a bioretention cell: Phosphorus partitioning, accumulation, and export

Urban Stormwater Phosphorus Export Control: Comparing Traditional and Low-impact Development Best Management Practices

“…Unobstructed drainage of the filter medium helps avoid the development of anoxic conditions that, in turn, can explain the exceptionally high TP and SRP reduction efficiencies reported for certain LIDs, such as the bioretention cell in the Toronto metropolitan area previously investigated by the authors. 14 The prevalent SRP concentration enrichment by LIDs is partially offset by the surface runoff flow reduction. Nonetheless, when considering surface runoff SRP loads, LIDs on average still underperform relative to traditional BMPs (Figure 3c).…”

“…15,16 In addition to differences inherent to the type and design specifications of a BMP, 5 the P control efficacy of BMPs also varies considerably depending on climate conditions and watershed characteristics. 17−19 Notwithstanding the development of a limited number of mechanistic models that explicitly represent P transformation processes within BMPs, 14,20 most estimations of the effects of BMPs on P export at the watershed scale rely on simple empirical relationships. Typically, a single elimination percentage or a fixed first-order P reduction coefficient is imposed to the inflow P concentrations or loads.…”

Mineral formation explains the high retention efficiency of dissolved reactive phosphorus in a residential stormwater pond

“…In fact, internal loading explains why the outflow from some SWPs is enriched in DRP relative to the inflow. 73 The Richmond Hill SWP, however, exhibits the opposite behavior. That is, despite reducing conditions at the SWI, the proposed sink-switching from more reactive P pools into a stable (non-redox) mineral pool counteracts internal P loading and, hence, results in the net removal of DRP from the water column.…”

Contrasting Impacts of Agricultural Intensification and Urbanization on Lake Phosphorus Cycling and Implications for Managing Eutrophication

“…The inferred lower urban TP loads of Phase 4 diverge from other studies that found urban TP loads to be of comparable magnitude to those from agricultural areas (Janke et al., 2014; Petrone, 2010). These contrasting findings indicate that while P wash‐off from urban areas is an important source of P (Zhou et al., 2023), stormwater management can significantly attenuate the export of urban P to downstream aquatic ecosystems.…”

“…In agricultural landscapes, practices including buffer strips, cover crops, and conservation tillage are used to reduce P export (Sharpley et al., 2000). A common approach to mitigate excess TP loads from urban landscapes to downstream water bodies is the implementation of stormwater management infrastructure, which can reduce peak water flows and nutrient runoff, including that of P (Carey et al., 2013; Garnier et al., 2013; Jacobson, 2011; Shuster et al., 2005; Zhou et al., 2023).…”