This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Modeling Water Loss

Hi,

We know that in many places a great portion of the "demand" is due to water loss and we also know that water leakage is directly proportional to the system's pressure. I would like to know, if you are doing and how you are doing to model water losses.


Here where I work, we are loading losses using the unity line method and for the real demand we choose a method based in the data we have.
Today I saw that there is a way we regulate demand depending on pressure, but it doesn't seem to be possible to choose which demand of the collection of a junction the pressure dependent will be applied. It would be nice to say that the demand by loss is pressure dependent and the costumer demand isn't.

Thanks,


Parents
  • You want customer demands to be fixed demand while leaks are pressure dependent and you don't know where the leaks are.

    One suggestion is to place pressure dependent leak nodes somewhat throughout the system and assign the leakage to those nodes. This will enable you to do things such as investigating the effect of changing pressure on leakage.

    Remember however that not all non-revenue water (unaccounted-for) is leakage. A lot of it may be apparent loss (e.g. theft or meter inaccuracy) which will not be as pressure dependent as leakage.
  • Thanks for the reply.

    That is the solution we though, adding nodes exclusively for leaks every X meters. We just don't know if we will be able to do it automatically for larger cities and if it will pollute too much the modeling. We will try it for the next project and then we tell if we were successful.

    We consider theft, meter inaccuracy and other non revenue losses like normal demand, they are usually distributed for costumers in modeling. To estimate the leaks, when available, we get part of the night minimum flow measured after tanks during a period.
Reply
  • Thanks for the reply.

    That is the solution we though, adding nodes exclusively for leaks every X meters. We just don't know if we will be able to do it automatically for larger cities and if it will pollute too much the modeling. We will try it for the next project and then we tell if we were successful.

    We consider theft, meter inaccuracy and other non revenue losses like normal demand, they are usually distributed for costumers in modeling. To estimate the leaks, when available, we get part of the night minimum flow measured after tanks during a period.
Children
No Data