Green Infrastructure (GI) practices are widely used for treatment of stormwater, as source control measures. GI can be used as individual measures or treatment trains for stormwater treatment. Implementation of GI as a treatment train is gaining popularity, due to advantages such as the enhancement of pollutant removal from a combination of several treatment mechanisms and the reduced risk of failing the whole treatment process, when one treatment measure is failed. Once a decision has been made for the implementation of GI for a particular site, a design procedure should be followed for sizing of the treatment measures to achieve the target reduction of pollutants. This is generally done by using a trial and error process with the aid of simulation models. However, unlike the sizing of individual treatment measures, several challenges are associated with the sizing of treatment trains, due to the availability of various treatment measures and different sizing combinations that are associated with them. Therefore, the present study proposes a methodology, for sizing of GI in treatment trains, by formulating the problem as a single objective optimization problem. Minimizing the Equivalent Annual Cost of the treatment train is considered as the objective function, and the constraints are the target reduction levels of pollutants (Total Suspended Solids, Total Phosphorous and Total Nitrogen) and the available land area. Even though the results of the single objective optimization should produce a single optimum result, the study has produced a set of least cost solutions within the constraints, which are close to the minimum cost solution, but with vastly different sizing of different treatment measures. These least cost solutions may have different performance measures related to economic, social and environmental objectives. The methodology is demonstrated by using two sample treatment trains, for a case study area in Melbourne, in Australia.
|Number of pages||8|
|Publication status||Published - 2015|
|Event||36th Hydrology and Water Resources Symposium: The Art and Science of Water, HWRS 2015 - Hobart, Australia|
Duration: 7 Dec 2015 → 10 Dec 2015
|Conference||36th Hydrology and Water Resources Symposium: The Art and Science of Water, HWRS 2015|
|Period||7/12/15 → 10/12/15|