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I'm trying to use the Curve Number (CN) Method calculate the required Detention Storage Volume for a pond near the outlet of a 26-ac watershed. I've used NOAA Atlas 14 to find the total rainfall depth (1.83 inches). I'm required to use the Farmer Fletcher 100-year 3-hour Unit Hydrograph for...

All, I'm a Civil Engineer and I've been tasked with creating a water model in EPANET for a proposed development that will have 7 different buildings to serve with culinary and fire flows. The seven buildings will be served by a looped waterline coming off a single connection to an existing...

cvg, that's correct. PSI = Feet of Head divided by 2.31, however, in my case, I'm converting in the other direction. 77.88 PSI, when converted, is 179.9 feet of head. This makes my equation: 4552 ft + 179.9 ft = 4731.9 ft Units can definitely be a bugger sometimes though. I mix them up...

Gocha, thanks for the reply coloeng! I guess looking at, say, a V = 10 ft/s would yield a velocity head of only (10^2)/(2*32.2) ≈ 1.55 ft => 3.59 psi, which isn't a ton of pressure I suppose... And perhaps by not including it, we would have conservative results. Thoughts anyone?

Considering Bernoulli's Equation, the Total Head should be the sum of the Elevation/Velocity/Pressure Heads at each point. My EPANET question is this: Is Velocity Head included in the computation of "Total Head" at a given Node? If so, which velocity is used? One of the upstream velocities? A...

thread555-88205 I have had the most difficult time getting some PS text in a particular dwg to show up over a viewport that has a raster image. Tried multiple workarounds with no luck. Finally, a coworker suggested I do an audit on the dwg, then save, close, and re-open. For some reason it did...

Valve (GPV). I just don't see where to enter the name of a curve like I do with Pumps...http://files.engineering.com/getfile.aspx?folder=90b50d67-5a5f-49db-b10c-5bdd6f3a0723&file=GPV.JPG

Here is a screenshot of what I see when I open the properties on a valve and pump.http://files.engineering.com/getfile.aspx?folder=61487298-763e-4df6-b6ad-6e41342b0b7d&file=Pump.JPG

Hello, I'm running an EPANET model for a commercial metered system. I'm required to install a water meter near the single connection point to the system. The meter that was chosen will produce headloss that varies with flow rate through the meter. I've created a "Curve" in EPANET to represent...

I'm not anticipating that anyone will review this plan in the near future. I'm just worried that the County or the EPA will show up on-site and want to see which "model or other type of calculator" I used to come up with the % sediment removal efficiency number that I came up with. I am required...

When I was first looking at this problem, I was hoping to find some literature somewhere that shows a % Sediment Removal Rate for different BMPs such as a silt fence. However, I spoke with someone more familiar with the requirements to comply with the 50' buffer section of the General Permit...

Thank you for your reply. The only guidance I can find is in Appendix D of the Utah Construction General Permit UTRC00000. Step 2 on Page D-11 suggests the use of a model such as RUSLE for determining the Percent Sediment Removal Efficiency of storm water controls.

I am putting together a SWPPP for a site that will have disturbed portions within 20' of a Surface Water. I have estimated the % removal efficiency as if I had retained a 50' natural buffer - 26%. Now I need to design BMPs capable of achieving equivalent sediment removal efficiency. I downloaded...

civilman72, I agree 100%. The problem is that some people are "yes sir/ma'am" people that would rather just take the reviewer's comments about the "error" and make a change to the plat (just to keep the reviewer happy) instead of sticking to their guns and helping to educate the reviewer about...

All, thanks for your input. Sorry it has taken a while for me to be able to respond again. wannabeSE, I have spoken with a few PLS's. They don't seem to be able to come to any sort of general consensus. I have seriously considered your redundant dimension idea, but I'm hesitant to use it due to...

That's a great idea! I think it should be made into the standard for these situations. Thanks for sharing!

In a bit simpler of a context, it's kind of like knowing that 1.4 + 1.4 = 2.8 Now round the numbers in this equation to the nearest whole number: 1 + 1 = 3 Of course 1+1 does not equal three, but why should we have to "fudge" the equation just to make the County reviewer happy (i.e. just erase...

Thanks for the responses Denial, you are quite the statistics expert. I realize there are certain probabilities that situations like this occur. I guess my question is: Do I need to do anything special when labeling the plat from a surveyor / County reviewer standpoint? Might be a question for a...

At my Civil Firm, sometimes measurements shown on a plat don't appear to be correct due to the fact that sometimes a ROUNDED SUM of two numbers does not equal the SUM OF THE ROUNDED numbers. For example, in the attached image, there are three rounded distances that don't appear to add up: 340.83...

That's a really good point bimr! An example of this I've found is when a manufacturer gives an efficiency of TSS removal of, say, 80% for their BMP. But when you ask them what particle size they base their 80% upon, it seems that a lot of times they can't seem to give an answer... Not that it...