5.Qualitative Upgrading of Water Supply Facilities

The total effective capacity of service reservoirs owned by water supplies is increasing year by year, from 27.2 million cubic meters in FY 1991 to 32.2 million cubic meters in FY 2001. Also, retention time of service reservoirs [(effective capacity of service reservoir / design maximum daily supply) x 24 hours] increased from 9.1 hours in FY1991 to 10.6 hours in FY 2001 (Fig.7).

Fig.7 Effective Capacity, Retention Time and Design Maximum Daily Supply