The Metropolitan Water Work Authority was established in B.E. 2510 to responsible for Bangkok Metropolis, Samut Prakarn and Nonthaburi area currently, the MWWA has serviced 3.8 million population at the rate of 2 million cubic meter perday of treated water. In B.E. 2543 the MWWA has planned to increase service capablilty up to 91 percent of Bangkok's population. Domestic water requirement ranges from 250 liter per capita perday to 300 liter per capita per day. However, the total water demand is 484 liter per capita per day. In B.E. 2545 it has been estimated that the population in Bangkok Metropolis will increase to 7.7 millions and treated water requirement will be increased to 3.5 million cubic meter per day. The required water will be treated from 3.83 million cubic meter per day (44.33 cubic meter per sec) of raw water. From this study, raw water source will be available from Chao Phraya river and Mae Klong river in which 30 CMS and 46 CMS will be drawn from Chao Phraya river and Mae klong river, respectively. Total raw water supply of 76 CMS from those two rivers will be adequated for the expansion of Bangkok Metropolis for the next 20 years.
