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:::* Retain the model design described above, though post process the results before reporting. Either delete the model result where there is overlap with the building footprint, or overlay building footprint polygon objects over/above the result dataset in the GIS Map Layout (hiding the flood model result within the building footprints).
:::* Exclude buildings from the rainfall polygon: This removes the rainfall from the model that would otherwise fall on the buildings. This approach will underestimate the amount of rainfall entering the model. If the collective building footprint area is negligible in comparison to the entire model, this approach may be acceptable.
:::* Exclude buildings from the rainfall polygon and suppliment the exclusion using <font color="blue"><tt>Read GIS SA RF</tt></font> inflow boundaries. Digitise a 2d_sa_rf polygon for each building (with a buffer of one of more cell2D lengthcells) where the building footprint has been excluded from the direct rainfall region. The sa_rf input will convert the input rainfall hyetograph into flow volume, depositingdeposited theinitially water toon the lowest 2D cell, then distributed over all wet cells, withniwithin the 2d_sa_rf regions (ie. on the ground surrounding the house). Refer to TUFLOW <u>[[TUFLOW_Example_Models#Boundary_Condition_Options | example model EG03_005.tcf]]</u> for a demonstration of this inflow boundary condition option.
#:::* Most rainfall that falls onExclude buildings collects onfrom the roofrainfall and through gutterspolygon and downpipes finds its way directly intosuppliment the sub-surfaceexclusion drainage system. In such case,using <font color="blue"><tt>Read GIS SA RF PITS</tt></font> commandinflow canboundaries. beThis usedapproach is similar to feedthe previous method, though instead of directing the waterinflow directlyto the ground surrounding the building, it is directed into the pitssub-surface drainage (underground pipe) system. EveryTo implement this approach every 2d_sa_rf polygon needs tomust haveencompass at least one 1D pit within to automatically deposit the flow. If multiple 1D pits are presentwithin a single 2d_rf_sa region, the flow from the polygon splits equally between the 1D pits.
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