The Chiku Industrial Park planned by the Tainan County government will use sand and gravel dug up from the bed of the Tsengwen River to do landfill. Because the Tsengwen already produces inadequate sand and gravel, this could lead to the collapse of the riverbed and the flowing of ocean water upstream.
台南縣政府打算開發的七股工業區，將在曾文溪床上抽沙填土，更可能造成沙源已不足的曾文溪，河床崩塌，海水倒灌。