From the preliminary study of the Royal Initiated Kaem Ling or literally monkey side cheeks (detention) Project that His Majesty the King suggested November 1995 for mitigating flood water, it was deemed appropriate to construct a lagoon or reservoir by utilizing the area near Sanpasamit and Sahakorn canals. Nevertheless, it was found later on that the topography of the area and social impact was not amenable for project implementation, and investment costs were rather high. On 23rd January 1996, H.M. the King visited the reservoir near Queen Suriyothai Royal Monument in Ayudhya province and suggested Mr.Banharn Silpa-archa the Prime Minister and Dr.Sumet Tantivejkul, member and Secretary-General of the Chaipattana Foundation and the officials of the government agencies concerned to carry out a study to solve the flooding problems of the lower part of the Tha-Chin river basin in the form of Detention (Kaem Ling)Project. It will be necessary to construct drainage regulator together with large-scale pumping stations to block off the northern part of the Tha-Chin river from Samut Sakhon upward.