problem with running an hydraulic analysis

[seyi milan]

Hello guys, pls I am working on an Epanet project. The analysis did not run, it kips telling me tank 1(2 and 3) are emptying at 1m (1m is the value I entered for my initial level in my tank). Pls I need help and advice.

[AB]

post the file please. I must say that I may not be able to answer your question though.

[seyi milan]

Here is a file c
opy of the analysis am working on.

[AB]

Hi,

So I don't know for sure how to answer your question as I cant really spend much time with it (My sincerest apologies, truly. Im plagued with my own EPANET nightmares at the moment) but here are some things that I noticed:

1) As you stated, you only have 1 meter of water available in each tank

2) If you run an EPS and then look at a system flow graph, ( you will have to right click on the graph and then change the vertical axis scale to be able to see the production/consumption lines) you will notice that your consumption is much much more than your production which justifies point one.

So I think that you don't have enough water in your system. Im not sure what you are modeling, but I think you need to either add a well or reservoir or make your tanks bigger.

From one EPANET novice to another, good luck and please let me know if you figure it out!!

Cheers,

AB

On Sunday, November 15, 2015 at 9:20:56 AM UTC-7, seyi milan wrote:

[Daniel Antonio Colocho Arévalo]

The problem is, I think, you forget elemental :

• You shall has at least 1 fountain (superficial or underground). If you analyze this, in your hydraulic model  it doesn´t exists this element. This it means that there is no place in which EPANET get the flow to satisfy the water demand. This is one of the most elemental requirements of the software.
• If you want your model it function so like you has it, you must indicate to EPANET that the initial level in the tanks is at least the maximum. 

I wait your commentary.

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[Laurent Wismer]

Hello Seyi,

As stated by AB, one problem is that the consumption (165 lps) is much bigger than the production (40 lps).
The point is that you don't have any reservoir you just have few negative demands giving you the 40 lps in flow, what is the node 11 ? An inflow of water ?
The I guess you have put tanks instead of reservoirs ?
Cheers

LW

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[seyi milan]

Hello@ laurent. Thank you for your time. The negative value implies the supply at node 11 from the tank exceeds the demand at node 11 hence the negative value(inflow). Are u also suggesting I include a reservior?

>
>@daniel - please how do I indicate to epanet that the inital level at the tank is at maximum as u suggested. When I increase the values and run my analysis, it shuts down my pump.On Monday, November 16, 2015 at 5:11:42 PM UTC+1, Laurent Wismer wrote:
> Hello Seyi,
>
>
>
> As stated by AB, one problem is that the
> consumption (165 lps) is much bigger than the production (40 lps).
>
> The point is that you don't have any reservoir
> you just have few negative demands giving you the 40 lps in flow, what
> is the node 11 ? An inflow of water ?
>
> The I guess you have put tanks instead of
> reservoirs ?
>
> Cheers
>
>
>
> LW
>
>
>
>
>
>
>
> From:      
>  AB <a.h....@gmail.com>
>
> To:      
>  Epanet and Development
> <epa...@googlegroups.com>
>
> Date:      
>  15.11.2015 21:48
>
> Subject:    
>    [epanetD] Re:
> problem with running an hydraulic analysis
>
> Sent by:    
>    epa...@googlegroups.com
>
>
>
>
>
>
>
>

[seyi milan]

Hello guys, I replaced the tanx with a reservior as suggested and my analysis still didnt run. I input a 25m head for the reservior, wen I run my analysis, it closes my reservior and tells me the pump is closed. Pls I also want to mention that the negative pressuree at 0:00:00 hr is still dere. I feel thats the major problem, not the reservior or tank. Over to u sirs.