How to include a closed water reservoir (For eg. clear water sump from treatment plant, Ground level service reservoir, Mass balancing reservoirs - partially below GL) in the model. Can it be a reservoir element or only tank element in the model?

Hi! Mark and Tom, Your replies are helpful. Exactly the modelling for the city has some basic requirements and limitations. Requirements are: 1) The MBRs and clear water sumps of WTP are existing and to be revalidated for 24 x 7 water supply. 2) The present inflow is known for every MBR / WTP sump and to be checked for total demand. 3) Better if EPS is done to fulfill peak flow and minimum pressure requirements. 4) The model to be checked for minimum water level of the MBR / sump under 24 x 7 supply. Limitations are 1)Source(s) are limited and are not infinite 2) MBR / clear water sump are all closed; have inlet at top of the tank and outflow from bottom. 2) Pumping is only 22 hrs 3)Pumps are of both HSC and VT and all are running. As suggested under steady state the MBR / sump shall be better as tank element; and for EPS model the MBR / sump shall be as reservoir element. What is the better option to revalidate for the above requirements and limitations?

Hi Tamil Amudhu,

Based on the description, I understand that you are referring to a project in India. Typically for steady state analysis you can use a Tank to model the Mass Balancing Reservoirs, etc. Using tank as an element in EPS essentially depends on the knowledge of the demands or the consumption rate. You need to calculate the Mass Balance Curve for each of the tanks and check the surplus or deficit for every tank; (This has to be done very easily in MS Excel and you would also like to check that the tank doesn't overflow or becomes empty.)

So to state simply, you can use tanks in EPS when you have the mass balance curve calculated (knowledge of vol. of water in the tanks, capacity of the tank, max./min. levels, demand consumption pattern, peak factor, etc is required) and you can use Reservoir (essentially, an unlimited source of water at a given elevation) when the tank info is not available.

Tanay

Hi Tamil Amudhu,

Based on the description, I understand that you are referring to a project in India. Typically for steady state analysis you can use a Tank to model the Mass Balancing Reservoirs, etc. Using tank as an element in EPS essentially depends on the knowledge of the demands or the consumption rate. You need to calculate the Mass Balance Curve for each of the tanks and check the surplus or deficit for every tank; (This has to be done very easily in MS Excel and you would also like to check that the tank doesn't overflow or becomes empty.)

So to state simply, you can use tanks in EPS when you have the mass balance curve calculated (knowledge of vol. of water in the tanks, capacity of the tank, max./min. levels, demand consumption pattern, peak factor, etc is required) and you can use Reservoir (essentially, an unlimited source of water at a given elevation) when the tank info is not available.

Tanay