TEMPORAL SCALE IMPACTS OF WEATHER VARIABLES ON URBAN WATER DEMAND
Keywords:
Urban water consumption, multiple temporal scales, weather impactAbstract
In this paper, two weather variables, temperature and rainfall, were analysed for their temporal scale impacts on urban water demand in the Metropolitan Waterworks Authority (MWA) service area, including Bangkok, Nonthaburi and Samut Prakan provinces. The multiple linear regressions were used for analysing impacts based on n-day averaged data and various time scales. The results indicated that while temperature strongly impacted on an increase in the urban water demand, rainfall weakly contributed to reducing them. Based on the temporal scale impacts, temperature should be included in all MWA urban water demand forecasting whereas rainfall should only be included for a mid to long term forecasting. An average surplus of water supply for short-term water demand is approximately 290,000 m3/day while for mid- to long-term water demand is approximately 4.74 MCM/month. Temperature increment from climate change will increase MWA daily demand forecast between 50,000-140,500 m3/day in 2047.
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