[Van PD Tri]

Hi to all,

Can anybody let me know how HEC-RAS calculate the hydraulic radius?

It is clear that the calculated Hydraulic Radius (R) (from HEC-RAS) plus the lowest point (LP) of a cross-section does not equal to the water surface elevation. In addition, the difference between the the water surface elevation and the combination of R+LP change according to the hydraulic roughness applied at a cross-section.

Could any body explain more how HEC-RAS do the calculation?

Many thanks and happy new year.

Best regards,

Tri Van