I would try Metcalf and Eddy. That is a good start. I used to have a process control book for environmental engineers that gave great design information for baffle designs but loaned it and I cannot remember the author. Another great reference is Perry's Chemical Engineering Reference. That...
MHSpurs;
That is strange for a 10 year old facility. Process waste is usually a form of PVC, HPDE or another form of polymer piping to handle different waste streams (i.e. pH, toxicity etc.) When I worked in the electronics industry, we had to use polymer piping all the way to wastewater...
CVG, thanks. You are right I used a 10 year event for my design but wanted to check the 25 year event as an arguing point. I did not make that clear above, sorry. I know the developer pays for the catch basins but this city official is the one making the issue. The developer told me in a...
PELS and CVG;
Hey thanks for the responses. This is the kind of thought process I like going through to check my reasoning. PELS you are right and I did calculate possible overland releases and conducted a very intense evaluation for each road. My calculations show that the spread on eather...
Oh well, I tend to agree with both of you. I spaced them at 250' with adequate spread with a slope of 2%. I have plenty of fall and the flows seem to work on my models. The gentleman I have been working with is not an engineer and states that to everyone. He is just going off of the city...
To all;
I am seeking some help. I have designed out a small subdivision and placed my catch basins a part based on a past design requirement that I learned. Well, the local authority wants the CBs every 400 ft which seems a little far for my design application. I have been using the Federal...
You also should check the municipality where you are working. I am finding that in Tennessee and surrounding states are not allowing the Modified Rational Method. I agree with Francesca that the hydrograph method is the way to go.
Murdock;
Also, check the Virginia best management practices manual. They have a great section in the engineering references that outline design conditions for grassy swales. I just finished a project that included a grassy swale design and hydrocad exfiltration numbers ended up being a little...
I have taken over some new responsibilities at work that I am really excited about. I have the groundwater remediation projects now and I am having to re-learn applications that I have not used in ten years. Anyway, I was looking at models that we have used but some of them seem outdated. Has...
I have taken over some new responsibilities at work that I am really excited about. I have the groundwater remediation projects now and I am having to re-learn applications that I have not used in ten years. Anyway, I was looking at models that we have used but some of them seem outdated. Has...
Thanks everyone. I sent the surveyor back out there to get us a couple control points. He did not place an original benchmark on the survey and we just did not catch that. Anyway, the grading contractor will be meeting the surveyor there and hopefully it will not delay the construction but...
To anyone;
I am not that versed in the art of grading but we had an engineer that quit our firm. Anyway, we had a project that he did and the grading contractor is asking for the control points on the grading plan. I was asked to look at the layout and he specified spot elevations throughout...
dgatlin;
I have done many projects in Georgia. The water quality volume will be used in addition to the hydrologic calculation that you used for detention.
For example, if an underground detention is used, you will need to calculate the first flush water quality volume in addition to the...
Thank you everyone for the comments. We all sat down and the architect admits making a mistake by changing the drawings. He came up with some excused but anyway. I think he was more worried that I was going to report him to the board more than cost of fixing the actual problem. I have never...
