Evidence details

07 Oct 2020

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Citation: Hatt, B., Fletcher, T. D., & Walsh, C. J. (2004). The influence of urban density and drainage infrastructure on the concentrations and loads of pollutants in small streams. Environmental Management.
Study description: This paper examines how the concentrations and loads of pollutants in urban stormwater vary with catchment imperviousness and strength of connection to stormwater drainage

Cause term/trajectory: Land use/land cover - urban (Increase)
Cause description: Connection of the catchment to the stormwater system, which is enumerated by proximity
Effect term/trajectory: Water quality - nutrients (phosphorus) (Increase)
Effect description: filterable reactive phosphorous in event flows
Response measure type: Pearson correlation coefficient
Response measure value: 0.81
Statistical significance: <0.05
Documentation: Figure 3
Response measure description: hierarchical partitioning of R2 values was used to determine the proportion of variance explained independently and jointly by each variable

Source data: Field
Study type: Observation
Study design: Spatial gradient
Number of independent control or reference sampling units: 15
Number of indendent impact or treatment sampling units: not applicable (gradient)
Sample size used in analysis: 15
Design description: 15 sites were samples varying in their imperviousness, connectedness and septic tank desnsity. Sites were sampled 15-29 times during baseflows and 9-18 times in (storm) event flows