| 释义 |
second-foot day second-foot day[′sek·ənd ¦fu̇t ′dā] (hydrology) The volume of water represented by a flow of 1 cubic foot per second for 24 hours; equal to 86,400 cubic feet (approximately 2446.58 cubic meters); used extensively as a unit of runoff volume or reservoir capacity, particularly in the eastern United States. |