Direct Rainfall (Rain on Grid) Modelling Guidance: Difference between revisions
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== What is the best approach for modelling buildings in rain on grid model? ==
There are numerous different industry standard ways to represent buildings in a direct rainfall model. <u>[https://downloads.tuflow.com/_archive/Australian_Rainfall_Runoff_Project_15_Subproject_report_buildings_final.pdf Australian Rainfall and Runoff Guideline, Project 15 (Representation of buildings in 2D Numerical Flood Models)]</u> discusses some of the available options. Common TUFLOW modelling approaches are summarised below:
# Using depth varying Manning's n, apply a low value (n = 0.02) at shallow depth (
#* This is a very common and easy to implement option. The low Manning's n aims to mimic the quick runoff response associated with drainage from the roof. The higher Manning's n aims to represent the losses associated with deeper floodwater impacting the side of the building.
# Raise the building footprint elevation using TUFLOW's topographic update features (eg. <font color="blue"><tt>Read GIS Z Shape</tt></font>):
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