水面横比降
transverse gradient of water surface
water surface transverse slope
cross-sectional slope of water surface elevations
平衡比降
equilibrium slope
equilibrium gradient of riverbed
临界水力比降
critical hydraulic gradient
临界比降
critical gradient
critical hydraulic gradient
critical seepage gradient
环境比降
environment gradient ration
大比降卵砾石河流
the high gradient gravel river