Suppose I'm designing a single service main to serve BOTH fire sprinkler/hydrants AND domestic needs. I would love for the pump gods to have come up with a way to create a single high flow pump that is fire rated (NFPA 20) AND meets drinking water standards (NSF 61). Is anyone aware of a pump...
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...
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...
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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...
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 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...
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...
I've been asked to pursue the SS6.2 Storm Water Quality Credit for one of my projects, a 3 acre parking lot. The requirements state that the BMP(s) need to be "designed to treat stormwater runoff from 90% of the average annual rainfall." I also understand that treating 90% of the average annual...
I prepare SWPPPs for the Civil Firm I work for. I have a question on the terminology of three acronyms. What is the difference between a SWPPP, a Sediment and Erosion Control Plan (SEC), and an Erosion and Sediment Control Plan (ESC). I have heard that an SEC Plan is the "Site Map" as it's...
