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...
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...
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...
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...
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...
I am practicing in the state of Georgia. I had to use a Water Balance equation for the first time last week. Results show that I must line the bottom of my Micro Pool with a clay liner and/ or a geosynthetic liner to significatly reduce the infiltration rate of the soil...(i need to maintain a...
I am practicing in the state of Georgia. Our Erosion and Sediment Control Manual vaguely describes having truck/ trailer wash out areas near Contruction entrance/exits (Co). Does anyone have specificaitons, detail drawings, or a reference of where to find a WASH OUT AREA detail?
Thanks!
I do not have Auto Turn Software. I have ACAD blocks that have several different wheel bases. Is there a standard Wheel Base (WB-67, WB-40, etc... reference AASHTO Chpt 2 pages 30-35) that I can use to check a fire truck entering a proposed fire station i am designing?
I have asked the fire...
Could anyone tell me what they use for Bituminous Coated Corrugated Metal Pipe (BCCMP) manning's n value? Please include your reference if you have one handy. Thank you much.
When designing for a 25-year storm network, which discharges into a pond, should we set the tailwater of the the discharging headwall, at the 25 year water surface elevation? My problem occurs when using our design software. (Terramodel)When designing our storm sewer network Terramodel allows...
Performing a hydrology study on a 40 acres commercial site. Municipality requires showing 1 year storm. I have a small drainage basin (1.7 acres) that becomes 0.9 acres with a driveway n the post-developed condition. I show approx 0.4 cfs increase to the 1 year storm. I've tried relooking...
I am working in Georgia and trying to run Pond Pack using the Rational Method. I'm having trouble with the Q/Qp (ratio)'Template data'. I don't have this catalogue listing.
Can anyone assist, or is anyone using Pond Pack and the Rational Method (*note not SCS Method) on small sites (less...
