b'INTERNATIONAL WATERSGUARDINGPa Sak theWritten by Greg WeissThailanD, as with the majority of its fellow ASEAN countries, has experienced rapid population growth and industrial development over the past few decades, particularly in their large city centers (e.g., Bangkok). Along with the benefits of this economic growth, there are also associated costs, which often surface as unexpected externalities, such as air and water pollution.The Water Environment Partnership in Asia (WEPA) recently rated Thailands overall surface water quality fair and improving in the majority of its river basins. Photo: A Buddha statue at sunrise, overlooking the Pa Sak River and Cholasit Dam. Khao Phra Ya Dern Thong view point. Phatthana Nikhom, Lopburi46 MISSION: WATER'