Ill condition at node X and reservoir is closed
MARVIN B. FERNANDEZ
Katie Jacobsen
Marvin,
I noticed a few things. Fix these, and then see if the model is running properly and let us know if it’s not.
I wonder if EPANET has trouble with the very small (12 mm) pipes. It may be OK to delete the small (12 mm) supply lines and just model the main lines (32 mm and larger). I kept getting ‘system unbalanced’ notifications until I deleted the 12 mm lines, but I’m not sure exactly what was causing the problem.
Nodes
- You have no demand at the nodes. Add the estimated demand. You don’t have to add it at every node – maybe at the ends of each 32mm line would be a good place to add it.
- There are a lot of disconnected nodes. These are nodes that are drawn right on top of each other accidentally. It looks like this happens everywhere you have a node with elevation ‘24’ (n440, n510, n511, n517, n520, n525, n528, n529, n532) and at most of the nodes with elevation ‘0’ (7 or 8 locations). At each of these locations, there are pipes and nodes that are not connected to the system. You can use the ‘Query’ button (A red question mark with some black dots next to it) to find the nodes with elevation 0 or elevation 24. It also happens at node n479/n458.
- Node n499 is connected properly but has elevation 0.
Pipes
- Pipe 6 diameter is 12 mm. It looks like it should be 75 mm.
Tank
- Tank 1 has a diameter of 0. Change this to the true diameter.
- Elevation is 27. Initial Level, Minimum Level, and Maximum Level are 29, 27.3, and 30. Is the tank 3 meters tall? Initial Level, Minimum level, and Maximum Level should be set to height in meters of the water surface above the bottom elevation. So if the tank is 3 m tall, initial level should be 2, minimum level should be 0.3, and maximum level should be 3.
- Minimum Volume is mainly used for non-cylindrical tanks, when you’re using a volume curve. Your model doesn’t include the volume curve, and I believe EPANET will not use this number for any calculations.
- Do you have the EPANET Manual? Look at Table 6.3 for the Tank Properties.
Pumps
- You may want to add nodes upstream and downstream of the actual pump locations, and then add pipes between the reservoir and the upstream node, and between the downstream node and the tank. This way you can include the length of the pipes from the reservoir to the pump to the tank. This may not make a difference if the pipes from the reservoir to pump to tank are relatively large.
- Use Pump Curve OR Power, not both. See Table 6.5 for Pump Properties.
Update all the things you can, and let us know if it works!
Thanks,
Katie Gibson Jacobsen, P.E.
Water Resources Engineer
HANSEN, ALLEN & LUCE, INC.
859 W. South Jordan Pkwy. Ste. 200
South Jordan, UT 84095
Office: 801-566-5599
Mobile: 801-919-6880
www.hansenallenluce.com
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Santiago Arnalich
Rajeshwar Rao Bandari
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