Modelling events between the 1 in 2000 AEP and the PMP

[Gordon Huang]

Hi all,

I need to model extreme events between the 1 in 2000 AEP and the PMP in URBS. RainURBS can do the interpolation. However, I am using Storm Injector to add preburst excess to the start of the hyetographs. What is the best way to model these extreme events in Storm Injector?

Cheers,

Gordon Huang

Water Resource Engineer

AECOM

[Chris Ryan]

Hi,

The easiest way might be to overwrite the IFD values for an event (such as the 1% AEP) with the values for your nominated extreme event and then model the event as per normal. You can even re-name the even using a custom event such as RInc_1% AEP_0_rare$200YrARI$ which will run the 1% event with a 0% rainfall increase (ie., no change) but call it the 200yrARI event. 

I think this should still work with the pre-burst features. Are you using the 'Pre-burst Excess'option or the 'Inject Pre-Burst into Temporal Pattern' option?

The other  option is to setup entirely new IFD Location csv file(s), import them and run custom event(s). There is an example of this in the CatchmentSIM - Storm Injector PMP tutorial here: https://csse.com.au/csim_online_help/pmp-and-pmf-gsdm.html (start reading from just above the PMP IN STORM INJECTOR section.

Regards,

Chris