Watergem_Final.zipHi i have doubt in flow supplied. Please see the model
Please explain this
Hello Ragavendra,
The flow supplied in your model from the reservoir depends on the rate by which your reservoir is filling the two tanks. The difference of elevation between the reservoir and node just downstream is also quite high. Also I also noticed you have modeled tanks of considerable size. This, along with the large capacities of the tanks are allowing more water to flow from the reservoir. Since the reservoir is basically an infinite source of water (only governed by the HGL) it can supply the huge quantum of water. Hence most of the flow is stored in the tank.
If you see the notification,
Flow supplied = 7114.377 m3/hr
Flow Demanded = 12.917 m3/hr
Flow Stored (by Tank) = Flow Supplied - Flow Demanded = 7114.377 - 12.917 = 7101.46 m3/hr.
The following article can help you out in this regard;
Calculation summary: Flow Supplied, Flow Stored, and Flow Demanded and how this relates to tank Flow (In) and Flow (Out)
Hope this helps.
Regards,
Yashodhan Joshi
Answer Verified By: Ragavendra V
If I reduce the elevation of the reservoir I will get negative pressure at the downstream side (PW-1 & PW-2). Actually, this site requires an average demand (310 m3/day) only we designed the tank to store for the one-day demand requirement. So what I have to do reduce the flow and increase pressure at the downstream side.
If you wish to control the flow at the downstream side you can use a Flow Control Valve (FCV). A FCV will restrict flow when flow goes above a threshold value.
Here is a relevant article that can help you;
What is the difference between a Throttle Control Valve (TCV) and a Flow Control Valve (FCV)?
The downstream head or pressure is dependent of your upstream head. If it is not satisfactory you can think of some ways where you can increase head upstream (E.g. using a pump).
When I use FCV the inflow and outflow problem solved. but I got negative pressure at PW-1 AND PW-2 downstream side of the FCV.