Hello All,

I want to initiate a discussion about riverine modeling using HECRAS.

As most of the HECRAS users know, building and other obstructions are
placed in the model as ‘Blocked Obstructions’ along the respective
cross sections. My concern is, whether using the ‘blocked obstruction’
option on top of the Manning’s n (based on the Landuse/Land cover) would be
a right thing to do. It will be a conservative approach to use the
‘blocked obstruction’ in conjunction with manning’s n. As far as I know,
Manning’s n already considers the landuse (for example: residential) so
it already takes the obstructions from the landuse into account.

Please share your thought on it with the group and let me know there
is a protocol on this issue, if any.

Thanks
Amit



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