The water balance of a four-people family rainwater harvesting system was calculated in a case study. The experimental water saving efficiency (WSE) was calculated as 87%. A simple computer model was implemented to simulate the behaviour of the rainwater harvesting system. In general, the rainwater collector volumes predicted by the daily model had shown a good correlation with the experimental values. The difference between the experimental and the predicted values for the stored volume can be explained by the lack of maintenance of the system that can affect its performance. On the basis of a long-term simulation of 20-year rainfall data, the following parameters were calculated: rainfall, water demand, mains water, rainwater used, over-flow and WSE. The collection of rainwater from roofs, its storage and subsequent use for toilet flushing can save 42 m3 of potable water per year for the studied system. The model was also used to find the optimal size of the tank for the single-family household: a storage capacity of approximately 5 m3 was found to be appropriate. The storage capacity and tank size were distinguished. The importance to take into account the dead volume of the tank for the sizing was indeed highlighted.
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Research Article|
April 01 2011
Modelling of a roof runoff harvesting system: the use of rainwater for toilet flushing Available to Purchase
C. Vialle;
1Université de Toulouse; INP; LCA (Laboratoire de Chimie Agro-Industrielle), ENSIACET, 4 Allée Emile Monso, F-31030 Toulouse, France and INRA; LCA (Laboratoire de Chimie Agro-Industrielle), F-31030 Toulouse, France
E-mail: [email protected]
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C. Sablayrolles;
C. Sablayrolles
1Université de Toulouse; INP; LCA (Laboratoire de Chimie Agro-Industrielle), ENSIACET, 4 Allée Emile Monso, F-31030 Toulouse, France and INRA; LCA (Laboratoire de Chimie Agro-Industrielle), F-31030 Toulouse, France
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M. Lovera;
M. Lovera
2Veolia Water North America, Technical Direction Group, 101, W Washington Street, Suite 1440 East, IN-46204 Indianapolis, USA
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M.-C. Huau;
M.-C. Huau
3Veolia Eau Direction des collectivités publiques, 36–38 avenue Kleber, F-75016 Paris, France
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M. Montréjaud-Vignoles
M. Montréjaud-Vignoles
1Université de Toulouse; INP; LCA (Laboratoire de Chimie Agro-Industrielle), ENSIACET, 4 Allée Emile Monso, F-31030 Toulouse, France and INRA; LCA (Laboratoire de Chimie Agro-Industrielle), F-31030 Toulouse, France
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Water Supply (2011) 11 (2): 151–158.
Article history
Received:
November 25 2010
Accepted:
February 14 2011
Citation
C. Vialle, C. Sablayrolles, M. Lovera, M.-C. Huau, M. Montréjaud-Vignoles; Modelling of a roof runoff harvesting system: the use of rainwater for toilet flushing. Water Supply 1 April 2011; 11 (2): 151–158. doi: https://doi.org/10.2166/ws.2011.031
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