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Hello, Finishing a CML&C steel pipeline design for the conveyance of raw water... Looking for a good reference or design manual which explicitly discusses the quantity and location of permanent reference electrodes. Our pipeline is about 5,000 feet in length and varies from 30 to 20 inches in...

Hello, Can anyone please confirm equation 4-35 in AWWA M23 (2nd ed)? I suspect that my copy may show the equation incorrectly, see attached. Besides the division line missing it seems that Fs and Rs should simply be added together within the denominator...

Hello, I'm looking to understand transients by self study. I have a copy of Waterhammer Analysis by John Parmakian, is this a good place to start? Can anyone vouch for this book? Any other recommendations? Thanks

Vertical pipe with flared end is used as a glory hole to return the supernatant of a pond to disinfection. Need to accurately determine the flow per height above the crest to establish the ponds capacity for attenuation. I feel tempted to use the broad crested weir equation and call it a day...

Do suppliers have ductile iron reducing 45 bends? Thought I saw them somewhere now I can't find them. I suppose anything can be made custom, just not sure if this fitting is uncommon or simply doesnt exist.

Hello, See attachment. The provided solution shows the specific weight of water subtracted from the specific weight of the soil (highlighted) in determining the active soil pressure below the water table. Should it not be the specific weight of water subtracted from the saturated soil...

Hello, I'm looking for a good publication/study which gives general guidelines for improved disinfection performance by upstream filtration. For example Metcalf 5th edition states: As additional chlorine is added beyond some limiting value, a log linear reduction in the number of organisms is...

Hey guys, I'm trying to represent the headloss through a splitter box, see attachment. I feel tempted to use a K value of .75 and call it a day. Is there any literature out there for something like...

Hello, I am trying to size a scum pump but I am unable to find much information on scum generation per overflow rate, or any other similar standards. Most existing thread discuss pump selection and disposal. Thank you in advance

I've been looking for solutions to the practice problems in Wastewater Engineering Treatment and Resource Recovery by Metcalf and Eddy. There doesn't seem to be any evidence that the publisher provides this. Maybe some scanned academic work out there?

Hello, Looking for a reference to a typical design for holding tertiary effluent using earthen storage ponds lined with HDPE. I do not expect a water depth greater than 15 feet. I am particularly interested in the properties of a liner most suitable for my application, and a reference to well...

Hey guys, Looking for some basic direction in selecting a valve. There seems to be a lot of options out there, not sure which one best suites my situation. I have a 250 gpm centrifugal pump conveying water from an open-surface tank up 200 feet to another open-surface tank. In the event of a...

Hey guys, Looking for a thread (or any reference really) which discusses different options for flow control valves; particularly those which are well suited for turbid water and can easily be throttled. Thank you in advance for your recommendations.

Due to the congestion of existing and proposed utilities a 12" FW line must be routed under the foundation of a proposed single story building. Does anyone have experience with this. Wondering if a trench with slurry backfill below the foundation is choice. Would CI piping be the only option?

Hey guys, I'm working on the design of an equalization basin for recycling backwashed water (this includes filter to waste as well) to the headworks of a traditional water treatment plant. Public health requires the recycled water to be no more than 2 ntu when sent back to the headworks. I...

Hello, I am looking for some basic literature which covers pipe selection for water distribution systems. Ideally it would cover material, classes, ratings, cost; and other considerations relating to design. Maybe someone could point me in the right direction, it would be greatly appreciated.