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From: Michael Johnson
To: “Kinagoto [via HEC-RAS Help]”
Subject:
=?Windows-1252?Q?Re:_100-Year_48_hour__peak_discharge_is_greater_than_the?=
=?Windows-1252?Q?_=BD_PMF_peak_discharge=3F?=
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=?Windows-1252?Q?_PMF_peak_discharge=3F?=
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Date: Mon, 26 Aug 2019 15:30:37 +0000
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References: <[email protected]>
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Kinagoto,

2 points:

1. You referred to the =931/2 PMP Storm.=94 Normally, the 1/2 PMF is obta=
ined by applying the full PMP to the watershed and then multiplying the ord=
inates of the PMF hydrograph by 0.5. This will always result in larger inf=
low than obtained by multiplying the ordinates of the PMP hyetograph by 0.5=
.

2. For a 1.6 square mile watershed, the 6-hr local-storm PMF will always b=
e more critical than the 24- or 72-hr general storm PMF.

If I had to guess, it seems like you are probably applying the 1/2 24-hr ge=
neral storm PMP to the watershed. Suggest calculating the 6-hr local storm=
PMP, applying it to the watershed to obtain the local storm PMF, and then =
multiplying the ordinates of the hydrograph by 0.5.

The only remaining question is the 100-yr 48-hr being larger than the 24-hr=
. Normally the 24-hr rainfall would be nested within the 48-hr distributio=
n and in that case given the much shorter time of concentration for the wat=
ershed – they should yield essentially the same peak runoff.

Mike Johnson, PhD, PE

Get Outlook for iOS<https://aka.ms/o0ukef>
________________________________
From: Kinagoto [via HEC-RAS Help]
Sent: Monday, August 26, 2019 5:27:02 AM
To: Michael Johnson
Subject: 100-Year 48 hour peak discharge is greater than the =BD PMF peak d=
ischarge?

HEC-RAS Model,

This is not strictly a HEC-RAS question. I am investigated a dam watershed =
(1.6 square mile) for 100-Year 24-hour and 100-Year 48-hour rainfall durati=
on and =BD PMP Storms.

While I am getting a peak discharge of the 100-Year 24 hour to be less tha=
n the =BD PMF peak discharge.

The peak discharge for the 100-Year 48 hour is greater than the =BD PMF pe=
ak discharge. I cannot explain it. I expected the =BD PMF peak discharge to=
be always greater than the 100-Year rainfall event.

Any of you have seen that before? Any explanation?

Thanks,

Kinagoto

________________________________
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