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The primary purpose in performing the hydraulic modelling of the existing water network in the study area is to identify the effects of estimated greywater reuse, as reduction in total water consumption and change in water flow rate. The hydraulic modelling was carried out using the EPANET software (www.epa.gov). The water network pipes and their characteristics were collected from the AADC. Three scenarios were performed in order to estimate the effects of greywater reuse on the pipe and sewer network (Table 3). The first scenario represents the actual water consumption. The second and third scenarios consider a reduction of total water consumption by 5% and 10%, respectively. It was found that the indoor water consumption was only 15% of the total water consumption. At the 192 lpcd greywater generation rate, theoretically, a maximum of 8% of municipal water could be saved if all the generated greywater was harvested and reused (Chowdhury et al. 2015). The adopted scenarios in Table 3 identified the pressure and velocity drop and rise on the existing water DN.

Table 3

Description of water consumption and greywater reuse scenarios

ScenarioActual yearly consumption (m³)% ReductionAnnual consumption (m³) used for modelling
1st 867,434 0% 867,434 
2nd 5% 824,062 
3rd 10% 780,691 
ScenarioActual yearly consumption (m³)% ReductionAnnual consumption (m³) used for modelling
1st 867,434 0% 867,434 
2nd 5% 824,062 
3rd 10% 780,691 

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