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  1. Surcharged

    Vortex flow

    I am examining an existing storm conveyance system that is flooding at a combination curb inlet/grate. My calculations show that the pipes are undersized. However, the owner thinks that the inlet may be undersized since he saw a swirling, vortex there during a storm. My question: is it possible...
  2. Surcharged

    Peak rate factor

    I am designing a sewer trunk line to serve a sewer system. The prison will have 3000 beds. Any idea on what peak rate factor to use for this?
  3. Surcharged

    Miltary Contracts

    Our office is within one hour of a large military installation. I would like to pursue some design work there - any idea how one gets started?
  4. Surcharged

    grinder pump station alternative

    I am designing a conv. store. We need to pump the sewage. We need 20 gpm at 30' of head. Due to low flows we need to use a 2" pipe which dictates the use of a grinder pump station. Preliminary cost estimate for a pre-packaged Flyght system is around 25K. Do I have any alternatives? this seems to...
  5. Surcharged

    water quality question

    I have been designing traditional detention ponds for years but am new to the water quality aspects of it. I understand that I must provide a water quality volume. Can I count the permanent pool as part of the water quality volume? Or at least a portion?
  6. Surcharged

    well piping

    I am designing a well house. I will be pumping from a well to a pressure tank. I will have a check valve and a meter. Any reason to have a gate valve too? I am considering one downstream of check valve and meter and upstream of pressure tank. That way I could isolate meter from tank in order to...
  7. Surcharged

    Bore

    I need to run a 4" pvc line under an existing roadway. Is it necessary to jack and bore or is there some type of freebore that we could use? Thanks.
  8. Surcharged

    Minimum slope for effluent pipe

    I am designing a STEG (Septic Tank Effluent Gravity) collection system for a 10 house development. The house will discharge to a septic tank, solids will then settle out. Effluent will then gravity flow to a pump station. A couple of questions: First, how should I size the pipe? Second what is...
  9. Surcharged

    Municipal Engineering

    I am making the transition from a land development business to one that provides engineering services to municipalities (sewer, water, etc.) It seems as if most cities already have a relationship with a firm - usually they have been with that firm for several years. This business is proving...
  10. Surcharged

    Year End Bonus

    I own a small civil practice. I give out bonuses and unfortunatley they are subjective based on how I think each staff member contributed to the company, how hard they worked, attitude, etc. I would like to enact a more qualitative incentive type system but do not know quite where to start. I...
  11. Surcharged

    Trip distribution

    I have a proposed subdivison that I am doing a traffic study. It is located on a state highway and in between 2 cities but closer to one city. The county has asked us to let them know if we recommend a left turn lane or a right turn lane. I want to determine the number of turns into the...
  12. Surcharged

    Max driveway grade

    An architect friend of mine is grading a driveway for a house with a slope of 25% down from the street to the parking pad. I told him that this was too steep, especially during ice storms. However I am from a flat part of the world and may not be thinking about this correctly. I appreciate any...
  13. Surcharged

    Flat concrete slab

    My client is an industrial wood processor. Several years ago they constructed a 200' x 200' concrete slab (8" thick) to store pallets on. They have a large forklift that moves the pallets. The slab was built 3' below natural ground and has retaining walls on all 4 sides. On one side is a gentle...
  14. Surcharged

    Peaking factor

    I am designing a 50 acre industrial park. I anticipate sewage demand at 1500 gallons per day per acre. I can probably assume that this 1500 gallons per day per acre is occurring in a 8 to 10 hour (say 9) window. So that will be 1500/9/60 * 50 acres = 139 gpm. Now I need to apply a peaking...
  15. Surcharged

    type A soils

    I am using the SCS method and am required to detain the 2 year thru the 50 year storm events to pre development levels. The site that I am designing is composed of very well drained soils that are in Hydrologic Group A. The site is a small residential subdivision (one street with a cul-de-sac)...

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