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Author(s): Monzur Alam Imteaz
Upendra Paudel
Amimul Ahsan
Cristina Santos
Title: Climatic and spatial variability of potential rainwater savings for a large coastal city
Issue Date: 2015
Abstract: Majority of the investigations on rainwater harvesting focused on sizing and potential water savingsincluding studies proposing different methods of estimating rainwater tank outcomes. Several studiesused monthly rainfall data to estimate rainwater tank outcomes. However, quantification using dailyrainfall data will be much more accurate compared to using monthly rainfall data. A vast majority ofworks using daily rainfall data used daily water balance model for analysis. Again most of the studiesusing daily water balance model used historical rainfall data, calculated water savings for many yearsand then presented an average of all the calculated years' total outcome(s). 'Raintank Analyser' is atool, which uses the same methodology and widely used; used by the South Australian policy makersfor producing relevant design charts. In contrast, eTank, a daily water balance model was developedto produce potential rainwater savings, augmented townwater supply, tank overflow, reliability andpayback period for three distinct climate conditions (dry, average and wet years). This paper presentscomparison of eTank calculated potential water savings with those calculated by 'Raintank Analyser'under similar conditions for a rainfall station in central Adelaide. In general, 'Raintank Analyser' producedwater savings are very close to the eTank calculated water savings in average year. However, through theeTank produced potential water savings in dry and wet years, itis found that significant climatic variationsexist. Magnitudes of climatic variations under different scenario are presented. Again, to assess spatialvariability, three more rainfall stations from different regions of Adelaide metropolitan were selected.eTank was used to calculated potential water savings in three climatic conditions (dry, average and wetyears) for various combinations of roof and tank sizes. Again it is found that depending input variableconditions (tank size, roof area and climate) significant spatial variations exist within some ofthe regions.Also, it is found that potential water savings not only depends on total rainfall amount of a particulararea, but also on other input conditions; i.e. under similar conditions an area with lower annual rainfallmay provide higher water savings due to rainfall pattern.
Subject: Engenharia hidraúlica, Engenharia civil
Hydraulic engineering, Civil engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia civil
Engineering and technology::Civil engineering
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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