But given current climate trends, existing facilities may not be adequate to deal with flood volume over the next 30 years. Therefore the first major side benefit of the new pipeline will be flood drainage.
但以目前氣候趨勢看，現有的設施要應付未來 30 年的洪峰流量可能不夠，因此這個排砂隧道另一大功能是排洪。