Internal loading in stormwater ponds as a phosphorus source to downstream waters

Taguchi, Vinicius J.; Olsen, Tyler; Natarajan, Poornima; Janke, Ben; Gulliver, John S.; Finlay, Jacques C.; Stefan, Heinz G.

doi:10.1002/lol2.10155

Cited by 28 publications

(26 citation statements)

References 30 publications

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“…As such, dissolved P reduction strategies should increase stormwater infiltration to promote P immobilization by soils. However, we caution that stormwater ponds, a popular nutrient management strategy, should be designed and maintained to avoid subsequent release of dissolved P (Taguchi et al, 2020). Conversely, because NO 3 − was mostly exported via baseflow at the urban site, strategies to reduce dissolved N export should restore riparian areas and build engineered structures that promote denitrification of stormwater (e.g., wet ponds and dry detention ponds) prior to infiltration.…”

Section: Implications For Receiving Waters and Managementmentioning

confidence: 99%

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Kincaid

Seybold

Adair

et al. 2020

Water Resources Research

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Catchment nutrient export, especially during high flow events, can influence ecological processes in receiving waters by altering nitrogen (N) and phosphorus (P) concentrations and relative amounts (stoichiometry). Event-scale N and P export dynamics may be significantly altered by land use/land cover (LULC) and season. Consequently, to manage water resources, it is important to understand how LULC and season interact to influence event N and P export. In situ, high-frequency spectrophotometers allowed us to continuously and concurrently monitor nitrate (NO 3 −) and soluble reactive P (SRP) concentrations and therefore examine event-scale NO 3 − and SRP export dynamics. Here we analyzed event NO 3 − and SRP concentration-discharge hysteresis patterns and yields for >400 events to evaluate how LULC and seasonality influence event NO 3 − and SRP export dynamics in three low-order watersheds with different primary LULCs (agricultural, forested, and urban). Differences among event NO 3 − and SRP hysteresis patterns suggest these nutrients have different source areas and dominant transport pathways that were impacted by both LULC and seasonality. Unexpectedly, we observed similar seasonal patterns in event NO 3 − :SRP stoichiometry among LULCs, with the most N-enriched events occurring in spring, and event stoichiometry approaching Redfield N:P ratios in the fall. However, seasonal stoichiometry patterns were driven by unique seasonal NO 3 − and SRP export patterns at each site. Overall these findings suggest LULC and seasonality interact to alter the timing and magnitude of event NO 3 − and SRP exports, leading to seasonal patterns in event NO 3 − to SRP stoichiometry that may influence ecological processes, such as productivity, in receiving waters. Plain Language Summary High flow events transport relatively large quantities of nitrogen (N) and phosphorus (P) to streams and downstream waterbodies where they may stimulate algal blooms and degrade water quality. We evaluated how land uses and seasons alter event nutrient transport. We monitored >400 events with sensors in streams with contrasting land uses. Event N and P concentration patterns differed from each other suggesting dissolved N and P were transported from different locations in the landscape. Further, the agricultural and urban streams received more dissolved N and P than the forested stream. This likely results from fertilizer applications in excess of crop (agricultural and lawn grass) needs and landscape modifications, such as drainage systems and impervious surfaces, that limit soils and vegetation from removing nutrients from runoff. Lastly, season influenced the ratio of dissolved N to P delivery, with spring events transporting the most N relative to P and fall events transporting the least. Overall, land use and season uniquely influenced event nutrient transport. Management strategies to reduce algal blooms in downstream waterbodies must consider interactions among land use, nutrient type, and season. However, ratios of N to P may change seasona...

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Section: Implications For Receiving Waters and Managementmentioning

confidence: 99%

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Kincaid

Seybold

Adair

et al. 2020

Water Resources Research

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“…In this way, urban stormwater ponds are in contrast to natural lakes, where labile inorganic and Fe-bound P usually dominate over organic forms of P [41]. Urban stormwater ponds in a Minnesota, USA study also had surface sediments dominated by labile organic P, which likely played a role in those ponds having high levels of OP in the water columns [42]. Of total organic P in our study, however, about 40% or more of it was made up of Residue P, which is generally held to be refractory P not readily bioavailable [26].…”

Section: P Formsmentioning

confidence: 96%

Chemical Fractionation of Sediment Phosphorus in Residential Urban Stormwater Ponds in Florida, USA

Lusk

Chapman

2021

Urban Science

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Stormwater ponds collect and transform pollutants (including nutrients, such as nitrogen and phosphorus) in urban runoff and are often hydrologically connected to downstream waters, making it important to maximize their pollutant retention efficiency. A key mechanism for phosphorus (P) removal in stormwater ponds is sedimentation. However, sediment P in stormwater ponds may be present in several chemical forms with varying bioavailability and potential to move from sediments into the overlying water column. The purpose of this study was to characterize the chemical fractions of sediment P in residential urban stormwater ponds, with the goal of better understanding expected movement of P from sediments to water. We used a chemical fractionation scheme to separate sediment P into the following pools: loosely adsorbed and readily available P, Fe- and Al-bound P, Ca- and Mg-bound P, NaOH-exchangeable organic P, and refractory P. From six stormwater ponds in the Tampa Bay, Florida urban area, we found the pool of readily available P was less than 3% of total sediment P, and the refractory P pool was 28–40% of Total P. However, both Fe/Al-bound and Ca/Mg-bound P each accounted for about 18% of total sediment P. These latter pools may become available under anoxic or low pH (<6) conditions, respectively, demonstrating that a change in environmental conditions could cause internal P loading from sediments to pond water.

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“…Under certain conditions, these contaminants may dissolve into the water and flow out of the pond [133,134]. It is therefore possible that the concentrations of contaminants are higher in the pond water than in the stormwater entering the pond [130,135]. Proper design and maintenance will avoid creating the conditions that can release accumulated contaminants.…”

Section: Overviewmentioning

confidence: 99%

“…Phosphorus accumulation in sediments can be released from the pond sediments into the water under conditions of high phosphorus loading and low oxygen. This "internal loading" can cause the effluent from a stormwater pond to be higher than the inflow [135,146]. Internal loading in ponds can be triggered by low dissolved oxygen concentrations, which may be worsened by the lack of mixing due to wind sheltering from tall vegetation around small ponds [141,142].…”

Section: Potential Negative Consequencesmentioning

confidence: 99%

It Is Not Easy Being Green: Recognizing Unintended Consequences of Green Stormwater Infrastructure

Taguchi

Weiss

Gulliver

et al. 2020

Water

Self Cite

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Green infrastructure designed to address urban drainage and water quality issues is often deployed without full knowledge of potential unintended social, ecological, and human health consequences. Though understood in their respective fields of study, these diverse impacts are seldom discussed together in a format understood by a broader audience. This paper takes a first step in addressing that gap by exploring tradeoffs associated with green infrastructure practices that manage urban stormwater including urban trees, stormwater ponds, filtration, infiltration, rain gardens, and green roofs. Each green infrastructure practice type performs best under specific conditions and when targeting specific goals, but regular inspections, maintenance, and monitoring are necessary for any green stormwater infrastructure (GSI) practice to succeed. We review how each of the above practices is intended to function and how they could malfunction in order to improve how green stormwater infrastructure is designed, constructed, monitored, and maintained. Our proposed decision-making framework, using both biophysical (biological and physical) science and social science, could lead to GSI projects that are effective, cost efficient, and just.

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Internal loading in stormwater ponds as a phosphorus source to downstream waters

Cited by 28 publications

References 30 publications

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Chemical Fractionation of Sediment Phosphorus in Residential Urban Stormwater Ponds in Florida, USA

It Is Not Easy Being Green: Recognizing Unintended Consequences of Green Stormwater Infrastructure

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