In 1999 Tsao Chi-hung learned that the Water Conservancy Bureau was planning to renovate the flood defenses, and he proposed a scheme for "greenification" of the riverside area. Objections were raised, however, with some pointing out that the site, if left untended, could easily get overgrown and become a breeding ground for snakes and vermin.
八十八年曹啟鴻得知水利處第七河川局有意再次整修河堤，提議綠化河堤周遭的休閒地，但有地方人士認為，綠化後若管理不善，更易導致雜草叢生、蛇鼠聚集。