Browsing by Author "Kamish, W."

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    Associations between stormwater retention pond parameters and pollutant (suspended solids and metals) removal efficiencies
    (South African Water Research Commission, 2018) Brink, I. C.; Kamish, W.
    ENGLISH ABSTRACT: Presented in this paper are the results of correlational analyses and logistic regression between metal substances (Cd, Cu, Pb, Zn), as well as suspended solids removal, and physical pond parameters of 19 stormwater retention pond case studies obtained from the International Stormwater BMP database. Included are cross-correlations between metals and solids in pond influent, effluent and removals. The findings provide insights fundamental to further development of improved models and design guidelines for stormwater ponds. Indications were that (i) pond efficiencies differed between high and low influent concentrations and masses, (ii) concentration was an invalid indicator of correlations between substances in pond influent and effluent as well as the fractions of substances removed within ponds, (iii) total cadmium, copper, lead, zinc and total suspended solids (TSS) were associated in surface runoff and similarly removed within ponds, (iv) statistically significant correlations were often only found in data groups either above or below a specific statistic (quartile value, median) for specific pond parameters, indicating that removals may have been differently influenced by pond parameters over different data ranges, and (v) the volume within the permanent pool was of greater importance to pond efficiencies than the volume captured during storm events.
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    Stormwater pond efficiency determinations with the effluent probability method : the use of mass versus concentration parameters
    (South African Institution of Civil Engineering, 2016) Brink, I. C.; Kamish, W.
    Use of the concentration parameter has in the past generally been favoured in stormwater structure efficiency determinations, and specifically with use of the Effluent Probability Method. However, efficiency is by definition related to the amount of substance removed within a stormwater structure, and concentration, being a mathematical construct, cannot be "removed". The purpose of this study was to investigate whether there is substantive proof for the use of substance concentration as a proxy for mass in the Effluent Probability Method to ascertain the amount of substance removed by a structure, i.e. its efficiency. Theoretical considerations and results of data analyses did not support this, and it is therefore recommended that mass, and not concentration, be used in efficiency determinations with the Effluent Probability Method.
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    Stormwater pond metals and solids removal efficiency determination with the effluent probability method : a novel classification system
    (South African Institution of Civil Engineering, 2016) Brink, I. C.; Kamish, W.
    This technical note contains findings from a larger research project into the design of stormwater detention and retention ponds for removal of metals and solids. The project required a standard system with which case studies obtained from the International Stormwater BMP Database could be compared in terms of efficiency. A novel classification system for use with the Effluent Probability Method, designed for this purpose, was developed and is presented here.