Common Duct Act Article 18

While the Common Duct crosses two (2) administrative jurisdictions, the related competent authorities shall conduct a co-management after negotiation. In case the agreement can not be concluded, the supervisory competent authority shall assign the management to one of the two parties.
中文原文 共同管道法第18條
共同管道跨越二個行政區域時,由雙方主管機關協商共同管理,無法協商時,由上級主管機關指定一方管理之。

English translation for reference only; the Chinese text prevails. Not legal advice.