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...
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...
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?
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...
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...
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...
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...
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...
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...
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...
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...
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)...
