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Hi, I've never worked in hydrology before and just got an opportunity to work on storm water management system project which will include lots of modelling of routing structures, pipes, channel and possibly reservoirs. I’m doing text books readings and have the following questions for a start...

People, Just wondering , has anyone faced anything strange when working with watercad 6.0 or 6.5 system curves , I got the system curve off watercad and drew it against the same pump curve I've inserted into watercad but the crossing point doesn't give the flow that watercad is giving in the...

All, I've come across an existing PRV valve installed in a way that it is subject to flow in the reverse direction it should normally works in. I know that some PRVs come with a check valve feature so this shouldn't be a problem for them, my question is what happen to the valve if this feature...

Hi, I can easily draw a system curve for a single pipeline, but how do you do that when you have a network of pipes? I know that each route will have a different system curve, should I just draw the system curve for the route that will give me the lowest pressure and match this with a pump...

Hi all, I have a situation where the pumps are pumping outside of its curve, max flow. the client has no problem with throttling the outlet to move the duty point back on the pump curve, he knows all about the energy losses and don't care. I was concerned about the pressure drop required to...

Hi, I ran a Google search looking for this but nothing came up so far. Does anyone have a technical paper or a guide in estimating pipe roughness over time (more than 10 years) for GRP pipes ? I would expect the roughness to be directly related to the type of fluid transferred, velocity ...

All, What are the main benefits of modeling a sewer system with a backwater analysis? I know that this way you can locate hydraulic jump locations and exact water depths in each pipe segment but are there any other advantages? I can see the benefit of locating a hydraulic jump but isn’t an...

All, How would you size the house connection for a high rise building, I know that no body put these in water distribution models so how do you size it ? I thought about assuming a fixed velocity "say 0.5m/s" and use the peak demand for each building to come up with a reasonable size...

All, Hi, I was looking into using an altitude valves for a buried "underground tank". how will this valve sense the high water level in the tank if it will be positioned above the high water level. Would a simple solution of lowering the altitude valve to below the high water level solve this...

Hi All, I was looking for the NFPA code on Standard on Water Supplies for URBAN "cities" areas Fire Fighting but couldn't find one. there is NFPA 1142 which is for suburban and rural areas and there is NFPA 1141 which is Standard for Fire Protection in Planned Building Groups but when I read...

Hi all, I'm currently working in a closed system of potable water distribution system, pumping directly to consumers, there are no storage tanks that I can use to shut off the pumps when it gets filled, so what is the most common way of controlling the pumps in this case ? 1- Pressure sensors...

All, I have an underground tank "top of the tank is at ground level" that will be fed by three separate lines: 2 lines coming from wells (several pumps in several wells) and another pressurized gravity fed line. I'm looking into providing a control to shut off supply when the tank reaches its...

Dear All, I'm kind of new at the water distributing design, so this question might sound silly for some of you. Everybody models the distribution network in certain software by inputting a demand at nodes, this is really like saying that each node will have a certain head loss which will...

Dear all, Has anybody developed such a sheet? I started going through NFPA to make one my self but I'm not sure of what I'm doing , I found the calculation method in more than one standard with different method and new exceptions and/or allowed reductions, I feel like I have to read all of the...

Hi, I'm kind of new at designing water network and would appreciate the help in doing the design for this. I'll just talk about my design and assumptions which would be great if you comment on. I'm planning to have a pumped system only, so I will not be pumping to elevated storage tank...

anyone has a good source of information on this topic this a system for waste water collection by sucking the waste water to your plant rather that gravitate it or pump it. it is mainly for flat or difficult terrain with low flow areas. An actual project design report , sketches ,drawings...

This is not an actual problem , it is just that i had an argument with a friend on what will happen if you had a big pipe say a 1000mm dia 20m long , filled with water and supported vertically, you have a perfect seal at top and suddenly you removed a stopper from the bottom , what will happen ...

Hi All I'm not sure if this is the best forum to post this question , does any body knows a site on the internet that explains how to size an air compressor, air receiver for surge vessels Thanks

Please if any one knows of a manufacturer that does this sort of valves, no telemetric, pressure sustaining valve for sewerage force main (no blockage risk), 150mm pipe. This pipe has lots of high point and pumping downhill, any one has a better solution to prevent the pipe from emptying on...

i have thousands of hyperlinks in excel that is linked to files on a network , my problem started when the network name changed , so the address in the hyper link must be changed as well ,, i'm manually changing the address for each file i want to open ,, is there a way to change the address for...