Tagged: Pre-burst Depth incorporation
November 2, 2018 at 12:51 pm #1379
Could you provide some advice regarding entering manual pre-burst depths and temporal patterns please.
I have read the v6.40 release notes and tried to follow the recommendations. For pre-burst depths the instructions state to use a percentage but the ARR2016 defaults appear to be fractions which I assume is correct. I also tried to include a 4.5 hour temporal pattern by copying the default patterns and including 4.5 hour ensuring all 60 increments were completed.
When I run MCA the burst column is zero for most of the simulations.
The preburst depths in the MCA outputs appear to be slightly different to my own calculations. An example is below:
Div Run ARI Depth TPat Pb I.L. IL_F LR_F Peak 01 Peak 02 Peak 03
63 50 100.3 175.0 24 35.56 0.45 1.00 1.00 108.70 98.79 295.52
For example, the ‘Depth’ value for a 1% AEP run is 175mm (down from 191mm after ARF). The 1% AEP preburst factor for this duration is 0.222 in the ARR2016 defaults which should provide a preburst depth of 38.85 mm.
I have tried to replicate the above run using a single deterministic storm with the same temporal pattern and IL factor and the peak flows are slightly different to the MCA results. Any ideas?
Brett StintonNovember 30, 2018 at 8:33 am #1412
I also have a problem with pre-burst application in version 6.41.
I wish to incorporate the ARR data hub pre-burst depths and so I tick the box ‘Use ARR data hub pre-burst depths’.
Nothing happens so I click on the ‘Edit Pre-burst depths’ button and then the values do appear in a new window as percentages from my data Output file from the ARR. That’s good, but when I click OK nothing appears in the cells in the original window.
Thinking that it might still be ok with ‘Use ARR data hub pre-burst depths’ ticked, I press OK and return to the Design Rainfall Specification Window. I then press OK but then I cannot proceed because two error messages pop up saying ‘Pre-burst temporal pattern not available for 18 hour duration’ and ‘Pre-burst temporal pattern not available for 30 hour duration’
I have checked my datahub output file and it does have preburst depths for 18 hours but admittedly no 30 hour depths. Interestingly, if I just wished to ‘Use default pre-burst patterns’, there are no depths for 18 and 30 hours.
Am I missing something, or using this function incorrectly? Or has anyone experienced a similar issue? I would appreciate any help or insight!
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