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Peter, Is there a way that to set a pump to begin at a certain time? I need to drain a basin with gravity flow first (as explained above) and once the basin reaches a certain water level I want to start running the pumps. I know I can set a pump on elevation which works however since the pond...

Thanks Peter.

Greetings, I have a project in which I would like to model a levee protected basin(in this case overtopped by surge) with culverts with one-directional valves to avoid backflow. I have setup the pond stage storages and outflow. I have also placed a link downstream of the pond with a table with...

Thanks to all for the comments, all are very much appreciated. I will have the first valve be an air release valve only, after all it is a high poiint. My concern was having a combination air release/vacuum, and it allowing air to entrain. For the second valve in the system, closer to the...

I have a drainage pump station with vertical pumps and wanted your commentary on the placement of Air Release/Vacuum Valves. I have added a quick sketch to better illustrate the situation. Will the air release valve by the pump allow air in as flow goes through the drop? The discharge has...

In reference to the post above, the design flow is 35 cfs (approx. 15709 gpm).

Everyone, sorry for the lack of response. There has been some troubleshooting going on between pump manufacturer and contractor but no results yet. Can anyone quickly back-check my TDH calculations? Using the schematic attached in the first post and having a total equivalent length of pipe (with...

Everyon thanks for the responses. As of now, the pump manufacturer is set to check the tilt of the prop and the bearing. I will keep you posted as soon as this happens. Thanks

Thanks everyone for the responses. I will try to explain more in depth what is going on with the station. All conditions as previously set, we run the pumps. Startup is not an issue, pumps start flowing and within seconds (2 at most), the weir is full up to +4 Elevation. The pump then runs for...

Thanks everyone for the replies. The reason why an orifice was being discussed was because of the issue of running out of the curve because of low head. I have to correct myself on a previous post. I mentioned that the impeller poured was between C&D, however, that is incorrect. The impeller...

georgeverghese- Thanks for the reply. It is a single stage pump. Minimum submergence is 5' per manufacturer and that is covered. As well, a splitter plate was installed in the intake bell to avoid vortexing.

Artisi - Thanks for the reply. It is indeed an axial flow pump as you have described. The impeller A-D curves are the impeller tilt. At this point, an impeller between C & D was poured. This is a new installation and when tested, had the issue of the pumps tripping. My concern was having low...

I appreciate all your answers bimr and LittleInch. I will keep troubleshooting and post once resolved. I was thinking of an 18" opening for the orifice. I will let you know how that goes.

Once again, thanks for the replies. I have attached the pump curve. I think we will have to add an orifice plate to create more head for the pump to go and operate at a healthy range. http://files.engineering.com/getfile.aspx?folder=6f3bd297-06f3-47af-a448-0bdcfe2cfdad&file=PerfCurve.pdf

LittleInch - Thanks for the reply. The discharge is open to atmospheric pressure. Therefore, we installed a weir so that it would create a tank operation . The weir brings the water to an elevation of +4 when the pumps are running (with this, the discharge pipe is fully submerged). You are...

All, We have a vertical pump with discharge after pump, with CenterLine(CL) at El. +8'. We then have a 6' straight pipe (23" ID) with a 6" ARV on top. After the 6' of straight pipe, the discharge pipe has two (2) 90D Long Radius bend (vertical CL change), which brings the pipe CL to El. +2...

We're in the process of designing a breakwater. I have been using the USACE Coastal Engineering Manual for the most part of the design. I have yet to find any recommendations on the height required for a Breakwater. Does anyone have any recommendations for the height of the breakwater? Should I...

Basic question here. I have culverts for drainage water draining gravity flow. The Culverts ends are both submerged. I have a higher head water than tail water elevation, however, the culvert has an adverse slope. How does this affect the hydraulics? Using Bernoullis, the head differential...

Peter, Thanks for your answer. I have changed the routing procedure and now I have the pump off available. As far as the estimate for the pump curve, the reason behind this is because I am analyzing existing pumps that were installed in 1978 and the owner does not have pump curves. I have...

All, I am modelling a basin and have basic existing pump information. I have ESTIMATED the pump curves and think that will work, however, for some reason I cannot select when the "Pump Off" elevation. It does not let me click on it and I am not sure why. Also, is there a way to have an outlet...