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I am trying to recalculate the HGL of a simple run of pipe after adding 3 more cfs into the system that it wasn't originally designed for. (Original design used wrong C factor in rational formula) I have a known elevation of the HGL and velocity at any given point along the stretch of pipe...

We have a new development needing to connect into an exiting 18" RCP pipe. The Manning's gravity capacity for this pipe at 3.03%, n=0.013 is equal to 18.3 cfs. There is no tail water. The inflow point of the pipe is a curb inlet. There is the ability to surcharge the pipe, by assuming the...

Can anyone point me in the direction of published charts for estimating sanitary sewage flows? I'm working in Texas and found a good reference under the TCEQ Chapter 317 "Design Criteria For Sewerage Systems". I'd like to compare my findings against a national publication for flow estimations.

I have a project where a municipality requires that a detention basin be able to store the 100-year, 2 hour rainfall event for the site without exceeding the pre-developed discharge rates. The area in question is relatively small, under 2 acres of parking. I'm not sure if I should be using the...

Here in Texas we have expansive soils, lots of clay. Under normal circumstances only the first foot or two of soil is affected seasonally, drying then re-moistened with the associated movement. The last 2-3 years have been a record drought, where it's suspected the soil was dried out to a much...

You might look into ASCE website, they have a library selection of engineering books that you can buy (somewhat discounted if you are a member). I purchased a book called 'Residential Land Development Practices-A Textbook on Developing Land Into Finished Lots'--David E. Johnson. I guess it was...

I think roundabouts are a fabulous idea. I've seen them in action in a few places and find them more efficient than a four way stop. Much more traffic seems to be able to navigate them as well, as opposed to a long line of stopped cars.

First rule of a site visit is take pictures! What part of the world is this in? I wonder if groundwater subjected to a regular freeze/thaw cycle against the back face of the retaining wall over time hasn't adversely affected the integrity. Any reason you can't wait until the spring thaw...

Civilman72, What I was thinking of is a trencher, like a 'Ditch Witch'. They come in a variety of sizes from those that you ride on to hand pushed models (have seen rentals for them at Home Depot as well). There is a boom that is lowered with revolving blade like a chainsaw with bits for...

Sounds to me that the retaining wall doesn't have any drainage immediately behind it, allowing hydrostatic pressure to build beyond the capacity of the wall. I wonder if constructing a 4" slit trench about 4-5 feet deep with a trencher, then installing a 4-inch perf pipe and back filling with...

That ought to be enough to answer the homework questions.

I always enjoy a good mystery, especially engineering related. Out of curiosity, what indications of water are you seeing? Do you know if the retaining walls were constructed with a drain system behind them? As far as the cold, is that unusually cold for your area or is it annual? The...

We have a new project in Oklahoma where we hired a local geotech to test the site and make recommendations. For pavement recommendations (rigid) I'm used to geotechs outlining subgrade treatment, pavement strength and thickness, along with RFT spacing and sizing. Anyone familiar with...

I am doing some preliminary cost estimating for a lift station and force main. I've sized the lift station by estimating daily demand and peaking factors (4) to get a GPD for the lift station. In sizing the force main I've been looking at velocity based on converting the GPD into Cu.Ft/second...

I think I recall the design fee being about 1%-2% of the estimated cost of landscape construction.

I've never heard of anything relating to the chemical composition of water regarding subgrade compaction. With respect to water, I can only think of the optimum moisture content determined by the proctor test.

Thank you for the responses. The treatment plant capacity doesn't need to be part of the study, the treatment plant operator (not the City) is responsible for that. The City manager (new) is trying to figure out what is going on with their sewer system. The record keeping was pretty shoddy...

Can anyone refer me a link to a sanitary sewer study for a small municipality. I've got a prospective retail development in a somewhat rural community and the City manager is asking for a sewer study to verify capacity. Initially I performed analysis on only the sanitary shed the retail...

You'd want to space them evenly at increments equal to or lesser than 15-feet. In the loading dock case of 42-foot width, you would space them at 14-feet. Edge, 14-ft, joint, 14-ft, joint, 14-ft, edge.

In Texas it is fairly common to have Portland Cement Concrete (PCC) for roadway and parking lot pavement. For an industrial yard I would guess your concrete pavement will be about 6 or 7 inches thick with #4 spaced 12 or 18 inches on center. We typically specify two types of joints, one is a...