The role of gully pots in determining urban stormwater quality

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Fulcher, G.A., 1989. The role of gully pots in determining urban stormwater quality. PhD, Nottingham Trent University.

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Abstract

A three year research project was carried out in order to investigate the role of the gully pot in determining urban stormwater quality from a separately-sewered residential catchment area. The fieldwork was carried out on selected catchment areas on the Clifton Grove Housing Estate in Nottingham, England between May 1984 and July 1986. The quality of urban stormwater has been identified as an important component within water resources studies and its impact upon surface water quality in urban areas has received much attention in recent years. The quality of the stormwater can be influenced by an above-ground (overland) phase and by a below-ground (within the storm sewer) phase and the gully pot is the point at which the two phases meet. The research programme looked at the quality of the gully pot standing liquor and also the changes in the pot liquor quality during a storm event in order to model these processes in relation to the hydrological conditions.

An extensive hydrometric programme was run over the three year period to measure rainfall in real-time over the catchment areas, A series of 'Linear Reservoir' Rainfall-Runoff Models were established for the microcatchment areas under study and so the flow volumes and inflow intensities into the gully pots could be simulated.

A comprehensive dataset of twenty-six physio-chemical determinands over a twenty-two week period within a calendar year was obtained for the gully pot standing liquor quality from twelve gully pots on the Clifton Grove Estate. The trends within the data have been fully described. A series of deterministic models was established using a step-wise multiple regression analysis in order to model the quality within the pot liquor with the hydrological conditions within the micro-catchment, draining to the individual gully pot. The data for the BOD and SS determinations were found to conform to a log-normal distribution and so a series of probabilistic models were also established in order to model the BOD and SS concentrations in the gully pot standing liquor against a known level of probability.

Fifteen storm events were analysed on three gully pots over an eighteen month period and a comprehensive dataset of chemical and hydrological data was established. The Linear Reservoir Rainfall-Runoff Models were used to simulate the storm hydrographs for each event from the rainfall measurement. A series of deterministic and probabilistic models of the BOD and SS quality in stormwater outflows from a gully pot were established. The models were shown to perform well and one stormwater quality model was used against some data collected from a gully pot in Sweden from another study and this quality model was shown to perform very well.

An extensive urban sediments sampling programme was conducted over a six month period and the nature and pollutant characteristics of these sediments were established, A number of experiments were set up to investigate the relationship between the pot liquor quality and the gully pot basal sediments and the results showed the importance of the sediments in influencing the resultant stormwater quality.

An extensive dataset of chemical and hydrological data has been established in order to investigate the role of gully pots in determining stormwater quality. A series of both deterministic and probabilistic models are presented to describe the state of the standing gully pot liquor and the quality of the outflow waters from, the pot during a storm event.

Item Type:

Thesis

Creators:

Fulcher, G.A.

Date:

1989

ISBN:

9781369323085

Identifiers: