User Forum of Software BASEMENT

Gonne

User

Registered: 2015-11-20

Posts: 15

HQ Relation outflow boundary condition

Hi,
I'm trying to improve a model which has a particular outflow condition.
I have to force the model to maintain a fixed outflow discharge starting from a particular value. After this value, the level start to increase and the outflow discharge must remain constant.
I tried with the hq relation boundary but BASEMENT shows me the following error:

ERROR -> x-value (usually = time) smaller than first x-value of boundary serie!
   (x-value: 167.454 first value: 167.5)

What does it means?
This is my hqrelation file:

H               Q
167.5    200
167.51    1469.6
168            1469.7
169           1469.8
170         1469.9
171            1469.95
172             1470

Where is the error?
Probably I don't understand how to use the hq relation. How can I use it?

Thank you,
Vieri

Lukas Vonwiller

Developer

Registered: 2014-09-04

Posts: 130

Re: HQ Relation outflow boundary condition

Hi Vieri

Try to add a first line to your H-Q relation for H-values < 167.5, e.g.:
H          Q
165.0    100

Hope this helps!
cheers, Lukas

Gonne

User

Registered: 2015-11-20

Posts: 15

Re: HQ Relation outflow boundary condition

Thank you Lukas, I solved this problem, but I don't understand how to force the outflow discharge to the maximum value of 1470.
How can I do this?
Thanks again

Lukas Vonwiller

Developer

Registered: 2014-09-04

Posts: 130

Re: HQ Relation outflow boundary condition

maybe try a last line with
1000    1470

Hope this helps!
cheers, Lukas