I have since rechecked some of my initial assumptions. First the 1/3 pmp velocity is 9.5 fps. The height calculates to be approx 9 ft (100 year).
Another consulting engineer recommends slurrying the rip rap and sizing it to larger than 24" dia stone.
Where do I find a reference to...
It is 3,000 cfs, typo on my part.. but I still think the water level is too high.... I will consult with the client and my collegues on a stilling basin...my initial thoughts are that due to the topography, the gentle and flat nature of exiting water (and aesthetics of a golf course) that the...
Working in Georgia. I've been asked to size a rip rap channel downstream of a large 16' tall concrete principle spillway. Spillway is the primary outlet control to a large golf course lake. Common practice for our company, during civil site work, for outflowing storm pipes is to use a Rip Rap...
Where is your project; latitude and longitude?
What flows are you using and where did you get them?
Is there an esrablished Base Flood Elevation ?
Is there a floodway shown in your FEMA Maps ?
West Point, Georgia (Chattahoochee River)
32 deg 52' 28.0714 Lat
85 deg 10' 55.9816 Long
Flows:
100...
RWF7437, I've heard of what you are refering to, could you or anyone else tell me where to find this reference to Floodway vs. Floodplain, and the effects, or requirements when you would like to fill in these areas.... what to do, vs. do not need to do, unless local ordinances apply Thanks.
Some really good input...I appreciate all of it. To reply to many of the questions.
Reason I'm doing this: We are filling a little bit in the flood plain. We are attempting to show little to no rise in 100 year wse elevation, thus allowing us to fill in the flood plan. (someone please...
I am modeling a river, adjacent to property we are developing. I have flow data from a nearby USGS rain guage, obtained from FEMA's FIS study. I have 5 x field run cross sections (survey crew using a river boat) to get bottom of channel elevations. Depth of river is approx 4-6'. When I model...
jgailla,
do you have a specific manufacture in mind.
civilperson,
we will be constructing the pond, there is not a standing body of water....i think you're scenario assumes a standing body of water, correct?
Pond design, I need to sustain a permanent pool of water...
Does anyone use, or recently spec'ed a popular manufactured clay liner?
I would like to suggest a popular brand to our client, if possible.
My calcs show that I need an impenetrable ground surface. I am reading as much as I can on...
i am trying to figure out if I need a buoyancy pad for a residential pond outlet control structure (OCS - common term here in Georgia). Does anyone have a spreadsheet or a good reference to relearn how to compute and check for bouyancy? I want to make sure if I specify a concrete bouyancy pad...
Highway 27, ok I think we're on the same page...i assume you use pond pack. For the Notch, (in your example ...the 1 x 2 foot stem), I am using Pond Pack's orifice selection, choosing AREA, entering the square footage (your example 1 x 2 = 2 SF), number of notches, and setting this area to the...
I am designing a pond outlet control structures (OCS) in georgia. I am getting confused on what coefficient to use when modeling (we use pond pack) a T notch weir. Specifically, the 'notch' part to the "T" (said another way, the 'stem' to the letter T). The weir will be submerged at the...
Thank you for asking me to clarify. I have a multiple orifice structure, to handle different frequency storms (ie: FYI this is Georgia, water quality 1 year-24 hour release, channel protection 2 year-24 hour, emergency overflow 100 year). Is there any hydraulic, structural or cost advantage...
I have an outlet control structure in a standard detention pond that I specified as a square concrete shape. I was told that most engineers use ciruclar due to cost, also how well it holds on to an earth pond embankment... is this correct?, and is this a better shape when placing the outlet in...
