This is due to flooding in the Pasak River basin during the flood season and water shortage during the summer. This happens annually. His Majesty King Bhumibol Adulyadej therefore asked the Royal Irrigation Department to study the suitability of building a dam to solve the problem. On February 19, 1989, the Council of Ministers approved the opening of the Pasak River Water Storage Dam project after studying its suitability and environmental impacts. Pasak Cholsit Dam took more than 5 years to complete construction from December 2, 1994 to September 30, 1999, and the inaugural ceremony of the dam was held on June 15, 1998, with Princess Maha Chakri Sirindhorn as The President, and on October 7, 1998, His Majesty King Bhumibol Adulyadej named the dam “Pasak Cholsit Dam”, which means “Pasak River Dam that holds water efficiently“. His Majesty King Bhumibol Adulyadej, accompanied by Her Majesty Queen Sirikit and Her Royal Highness Princess Maha Chakri Sirindhorn, held the opening ceremony of the Pasak Cholsit Dam on November 25, 1999.