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Exterior coating is cement mortar. Geotech reports a low exposure category for water-soluble sulfate content per ACI.

Garry, the client has indicated that they would determine if a sacrificial or impressed system would be desirable sometime in the future, when deemed necessary to protect the pipe; they just want test stations with copper copper sulfate half cells for now. BTW, the geotech report shows that the...

Thank you for the responses. I asked my project manager if we could retain a CP engineer to review our plans and specifications but he indicated that it wouldn't be worth the cost, even though we have a healthy budget with the design at 90%.

Thank you for replying. Will order the Peabody book.

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...

Thank you! Also, for eqn. 4-39 where N phi and Q are defined below the equation, the plus (or minus) symbol between 45° and phi/2 is not showing. Could you confirm as well?

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

They report C value for ogee crest as 3.7, got it! 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...

Thank you for the responses. Working on a rehab for a lift station. Existing dry pit for the pumps has limited space... will probably have to use some custom steel fittings.

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.

Some great lectures by Dirk Bondy: https://www.youtube.com/channel/UCGlAo3l4aRZRyuxQBWOn3JQ/videos

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...

Yes, and the reference at the end of the chapter is simply: Ekster, A. (2001) Personal communication Which leads me nowhere and is not very convincing.

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...

There is a significant amount of infiltration and inflow within the collection system during high lake levels. The high lake levels last almost the entire winter and produce daily flows near 0.8 mgd. There is substantial infiltration as a result of precipitation events with a return interval...

Yes

The information provided is from the proposed process model. We would like to replace the existing 35' clarifier with a new 65' to account for seasonal I/I. The I/I associated with seasonal changes ranges considerably, 0.25 mgd during the summer, historical peaks of 2.7 mgd during the winter...