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Storm losses of N via tile-drainage in the US Midwest are a major concern for water quality in the Mississippi River Basin (MRB). This study investigates the impact of precipitation characteristics on NO3 −, NH4 + and DON concentrations and fluxes for spring storms in tile-drains in a Midwestern agricultural watershed. Bulk precipitation amount had little impact on solute median concentrations in tile-drains during storms, but clearly impacted Mg2+, K+ and NO3 − concentration patterns. For large storms (>6 cm of bulk precipitation), large amounts of macropore flow (43–50% of total tile-drain flow) diluted Mg2+ and NO3 − rich groundwater as discharge peaked. This pattern was not observed for NH4 + and DON or for...
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The impact of land-use on water quality at the watershed scale has received considerable attention in the past; however, little information is available on the impact of Residential Construction Areas (RCA) on nutrient and sediment exports at the watershed scale. In this work, the impact of changing land-use from agricultural, urban and residential construction areas on water quality in Eagle Creek watershed, IN is investigated. Average nitrate levels are high at 7.5 mg N.L (super -1) with maximum values between 14-35 mg N.L (super -1) during storm runoff events. Average baseflow phosphate levels of 0.007 mg.L (super -1) increase by 2 orders of magnitude during storms. Average baseflow suspended sediment concentrations...
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Determining how riparian zone hydrological conditions may change in response to precipitation in various geomorphic settings is critical to determine the occurrence of hot moments of biogeochemical transformations for phosphorus, nitrogen, sulfate, mercury and greenhouse gases in these systems. The author investigate water table response to precipitation at a high temporal resolution (15 min) in a riparian zone located in a deeply incised glacial till valley (20 m) with approximately 2 m of alluvium over a confining layer, in Indiana, USA. During storms, larger water table fluctuations (approximately 100 cm) occurred near the stream than near the toe slope (10–25 cm). A quick rise in water table near the stream...
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Considering the importance of solute exports during storms in annual nutrient budgets at the watershed scale, it is critical to understand the impact of seasonality and differences in land use on watershed hydrological and biogeochemical response to storm events. This study investigates the hydrological response to storms and chloride, nitrate and dissolved organic carbon (DOC) export dynamics during one spring storm and two summer storms in an agricultural catchment (watershed A) and a mixed agricultural/urban catchment (watershed M). Drier antecedent moisture conditions in summer were associated with lower runoff ratios during summer storms than during the spring storm studied. Watershed M also had a much flashier...
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