95PPU

[fatemeh babakhani]

Hello Dr. Abbas pour

Would you please let me know how SWATCUP estimates 95PPU region?

Once I used Normal Distribution Curve and following equations for estimating Upper Boundary and Lower Boundary of 95PPU.

U95PPU= Mean+1.96*Standard Deviation/ (Simulation Number)^.5

L95PPU=Mean-1.96*Standard Deviation/ (Simulation Number)^.5

But the 95PPU region which I was found was too narrower than 95PPU of SWATCUP! I was wondering if SWATCUP used Normal Distribution Curve.

Thank you so much!

Fatemeh

[Abbaspour, Karim]

No, it is not like that. It is not a normal distribution, you need to plot the cumulative distribution of flow and calculate the interval between 2.5 and 97.5. See if you can follow the attached Excel file calculation.

Karim

 

-------------------------------------------------
Dr. K.C. Abbaspour
Eawag, Swiss Federal Institute for Aquatic Science and Technology
Ueberlandstr. 133, P.O. Box 611, 8600 Duebendorf, Switzerland
email: abba...@eawag.ch
phone: +41 58 765 5359
fax: +41 58 765 5375
http://www.eawag.ch/index_EN

--
You received this message because you are subscribed to the Google Groups "SWAT-CUP" group.
To unsubscribe from this group and stop receiving emails from it, send an email to swat-cup+u...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[fatemeh babakhani]

Dear Dr. Abbaspour

Could you please let me know the definition of M 95 PPU? Does M 95 PPU represent the 50% probabilities? or is it the average of all solutions?

Thanks so much!

Fatemeh

[Abbaspour]

Yes, 50% probability.

Karim

[Ankan Jana]

Respected Dr. K C Abbaspour,

Please let me know the type of cumulative distribution. In the excel file, how the frequency is calculated. 

To unsubscribe from this group and stop receiving emails from it, send an email to swat...@googlegroups.com.

[2w2e]

You are calculating 95% confidence interval of a normal distribution. This is not 95ppu. Use the following:

[Hoang Anh Nguyen]

hi Dr. Karim, 

As I understand about your figure on 95PPU, n simulations lead to n discharge outputs over a simulation period. For example, I have a 120- month simulation, after running n simulations I will have 95PPU of discharge for each month. Am I correct?

I Look forward to hearing from you

Kind regards

Anh

--

You received this message because you are subscribed to the Google Groups "SWAT-CUP" group.

To unsubscribe from this group and stop receiving emails from it, send an email to swat-cup+u...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/swat-cup/8473eb69-6a13-4a59-a529-c63e75f42dee%40googlegroups.com.

--

Anh Hoang Nguyen (Mr.) Master of Civil and Environmental Engineering
Mob: 0973344199 Email: hoanga...@gmail.com l ihoa...@outlook.com
“Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven’t found it yet, keep looking. Don’t settle. As with all matters of the heart, you’ll know when you find it.” Steve Jobs

[k_abb...@yahoo.com]

yes, swatcup calculates 95ppu at every observation point.

On Tuesday, May 19, 2020 at 5:04:34 AM UTC+2, Hoang Anh Nguyen wrote:

hi Dr. Karim, 

As I understand about your figure on 95PPU, n simulations lead to n discharge outputs over a simulation period. For example, I have a 120- month simulation, after running n simulations I will have 95PPU of discharge for each month. Am I correct?

I Look forward to hearing from you

Kind regards

Anh

On Fri, May 8, 2020 at 12:58 AM 2w2e <abbasp...@gmail.com> wrote:

You are calculating 95% confidence interval of a normal distribution. This is not 95ppu. Use the following:

On Friday, January 22, 2016 at 9:48:47 PM UTC+1, fatemeh babakhani wrote:

Hello Dr. Abbas pour

Would you please let me know how SWATCUP estimates 95PPU region?

Once I used Normal Distribution Curve and following equations for estimating Upper Boundary and Lower Boundary of 95PPU.

U95PPU= Mean+1.96*Standard Deviation/ (Simulation Number)^.5

L95PPU=Mean-1.96*Standard Deviation/ (Simulation Number)^.5

But the 95PPU region which I was found was too narrower than 95PPU of SWATCUP! I was wondering if SWATCUP used Normal Distribution Curve.

Thank you so much!

Fatemeh

--
You received this message because you are subscribed to the Google Groups "SWAT-CUP" group.

To unsubscribe from this group and stop receiving emails from it, send an email to swat-cup+unsubscribe@googlegroups.com.

To view this discussion on the web visit https://groups.google.com/d/msgid/swat-cup/8473eb69-6a13-4a59-a529-c63e75f42dee%40googlegroups.com.