underdrain

n.

暗渠，阴沟；

v.

暗渠排水；

Underdrain
UNDERDRAIN
Underdrain
Underdrain system
Underdrain excavation apparatus
Underdrain Configuration to Enhance Bioretention Exfiltration to Reduce Pollutant Loads
Filter nozzle and underdrain systems used in rapid gravity filtration
Support and stand-off ribs for underdrain for multi-well device
Safety Monitoring Design for New Underdrain of Luanhe-Tianjin Diversion Project
Consideration to the Calculating Method for Underdrain in Highway Engineering
Ground-Penetrating Radar Investigation of Clogged Underdrain on Interstate I-71
Numerical simulation and application of construction process of underdrain beneath expressway
Study of water quality purification in soil layer of paddy fields, 1: Field test of water quality purification using underdrains