Quality of urban stormwater runoff: an appraisal of the role of gully pot liquors

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Fletcher, I.J., 1981. Quality of urban stormwater runoff: an appraisal of the role of gully pot liquors. PhD, Nottingham Trent University.

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Abstract

The quantity and quality of stormwater runoff from a small separately sewered residential suburban catchment has been monitored for 24 storm events over an 18 month period. An automatically operated continuous injection lithium dosing apparatus in conjunction with an automatic sampling machine was used as a means of flow determination and sampling for quality measurements. The samples were analysed for several pollutants and the results enabled an estimate of the annual pollutant loads discharged from the catchment to be calculated. Using multiple linear regression the relationship of pollutant loads and concentrations with meteorological parameters was investigated. Conclusions have been drawn on the relative importance of parameters in defining pollutant loads, the mode of removal of pollutants, pollutant interrelationships and the significance of sources of pollution.

The quality of water stored in roadside gully pots on the same catchment was investigated over a two year period. This study and additional laboratory investigations have enabled detailed conclusions to be drawn on the impact of sources of pollution on the chemistry of the stored water and the effect of rainfall, dry periods, seasonal variations and human activity upon the quality of the stored water.

The removal of dissolved material and settled sediments from gully pots for different flow rates was investigated in the laboratory using purpose-built apparatus. The results obtained were used to develop and calibrate mathematical expressions describing the pollutant transport processes. In order that the equations could be applied to real catchments and storm events, it was necessary to develop a mathematical simulation of the rainfall-runoff process. The model developed employs a single linear reservoir for the prediction of an inlet hydrograph to the sewer system from a net rainfall hyetograph and the fixed parameter Muskingum-Cunge technique for routing the inlet hydrographs through a pipe network to form the outlet hydrographs. Inclusion in this model of the equations, describing the removal of water stored in roadside gully pots prior to the rainfall event, enabled the contribution of gully liquors to storm flow to be calculated.

Contemporaneous monitoring of rainfall and runoff and contemporaneous examination of the quality of stormwater runoff and the quality of water stored in gully pots provided the data necessary for utilising the model to determine the pollutant loads in stormwater runoff that are attributable to pollutants stored in gully pots.

Item Type:

Thesis

Creators:

Fletcher, I.J.

Date:

1981

ISBN:

9781369324792

Identifiers: