Physical and Chemical Data Needs for Designby J. Bryan Ellis, Middlesex Polytechnic, London, England,
Abstract: The problems and deficiencies in the existing characterisation and evaluation of urban stormwater runoff quality are examined through discussion of adopted and proposed design criteria intended for pollution control enhancement of the sewerage system. Conversion of rainfall to sewer inflow is dependent on the selection of an appropriate storm intensity and return period and the potential benefits are identified of including cost optimisation approaches for the quantification of damage functions in the chosen design criteria. The pollutional significance of further refinements of initial losses on design inflow volumes is discussed together with the potential extent and effect of sediment deposition on the quality performance of the sewer system. The need for appropriate design criteria and supporting hydrological and geochemical data to help resolve identified deficiences and in up-grading measurement technology is emphasised and suggestions made for further practical actions to realise urban water quality enhancements.
Subject Headings: Hydrologic data | Municipal water | Inflow | Runoff | Pollution | Storm sewers | Sediment
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