Missions of the Irrigation Association are stipulated as the following:
1. Construction, improvement, maintenance, and management of farmland water conservancy activities;
2. Prevention of disasters and post-disaster response measures for farmland water conservancy activities;
3. Expenditures raising and fund initiation for farmland water conservancy activities;
4. Research and development for interest of farmland water conservancy activities;
5. Collaboration with government over land, agricultural, industrial policies, and rural village development;
6. Assignments by the Competent Authority in accordance with law.

Irrigation Association shall lease or purchase land for constructing or improving water conservancy facilities from landowner or rights-holders. Irrigation Association shall request authorization from the Competent Authority to expropriate the land according to law in cases of purchase or lease proposal fail to reach agreement; in cases of public land, Irrigation Association may apply for leasing or purchasing.
Land provides for purpose of water conservancy shall be used as before; land taxes shall be exempted during the period of land use.

In cases of proceeding measurement for water conservancy construction such that removal of obstacles is necessary, Irrigation Association shall request local county or city government in jurisdiction to notify landowner or possessor to proceed removal.
In cases of damage resulting from removal in the preceding Paragraph, landowner or possessor may request compensation; in cases of relevant controversy, the Competent Authority shall determine according to report from Irrigation Association.

Irrigation Association may report to the Competent Authority for water resources to handle emergency rescuing action resulting from flood event in accordance with Article 76 of the Water Act and relevant regulations.