FMA Challenge 3: Difference between revisions

As discussed in the Manning’s n table above, the main creek n value of 0.20 is considered very high, especially in the lower reaches of the study area. A sensitivity analysis was carried out by lowering all the Manning’s n values in the main channel (modeledmodelled as 1D cross-sections) to 0.10.

The image below shows the flood depths and extent for the two non-infiltration simulations at 100ft resolution (left with channel 'n' = 0.2, right with channel 'n' = 0.1). Some significant deviations in flood extent can be observed, particuallyparticularly sothsouth of the main channel. This can be largely attributed to the higher conveyance in the channel for the 'n'=0.1 case. <br>