Search results for query: *

I am rebuilding an old road in Texas. The proposed section is 1.5" type'D' Hmac over 2.0" Type 'B' HMAC over 8.0" A2Base, over 6" lime stabilized subgrade. The existing road section was thicker than the proposed because of 9-inches of existing asphalt. What would be the effect of mixing...

Thanks Ron. I too had thought about cement stabilizing. Also, Texas we have something called black base, which is just asphalt impregnated base. The TxDOT A1 base is supposed to be good unconfined when its compacted, but the A2 base-not so much.

I am reviewing a set of plans that constructs a new road over an existing road. The existing road is on a 5 percent grade and shows a lot of erosion and some bare rock outcropping. When it was first built it caused a lot of flooding to the area downstream at the bottom of the hill. The 22-foot...

We have a two week window to get the project done. We are building a 6-in. thick, 6-ft. X 6-ft. reinf concrete slab on 6-in, compacted crushed stone, to support a small condensor unit. Using 3000 psi concrete. After slab is poured, how many days before we can safely install the unit? Any...

Thanks bridge buster, never would of thought of that.

Hey guys and gals, I am assembling a Design-Build contract to signalize an existing intersection. I need to do a cost estimate, so I know how much funding to request. Does anyone know where I can get prices on mast arms, traffic and pedestrian signal heads, traffic signal control cabinets...

I need to install a 12 -foot tall chain link fence that has privacy slats in it. Location is San Antonio, Tx. Soil is Houston black clay. What type of wind load is recommended to design for? How deep would conc. piers for the fence posts need to be?

ishvaaag-We have a standard 1 year warranty. In my experience, even mediocre paving will hold up pretty well- for the first year. After that is when deterioration really begins. We have a chance to avoid future liabilities now, but what we pay extra now will be far less than we would have to...

We have high clay soils in this area of Central Texas and this is a high volume of traffic street (arterial). The contract was awarded with the contractor having Option A- 2.5" HMAC over 8" crushed limestone compacted base course over 6" lime stabilized subgrade or Option B 2.5" HMAC over 12"...

I am reviewing at set of plans that use an underground detention system to control post development flow. An open field will become a large parking lot. I have concerns because the soils are clay with a high PI. This system is actually more of a retention system because the outlet pipe is 2.5...

All, thanks for your help. To jgailla, the the total acreage that drains to the site is 2.7 ac. 1.7ac parking area and 1.0 ac. undeveloped, but rocky, not much vegetation, and sloped. I designed for the 25 year storm. I developed a composite "c" of 0.97. My Q=cIA is...

gbam, slope of the ditch is 2.33%.

gbam, forgot to tell you if I combine the offsite and onsite drainage areas and use the longest Tc the flow rate is lower than the onsite flow rate.

I determined the velocity using the following equation: v = (20.3282)*(S^1/2) for paved surface S= 0.074 ft/ft thanks

I am working with a large (1.7 ac) asphalt parking area that drains to an existing ditch located parallel to the parking area's down stream edge (see attached sketch). This ditch also receives flow from 1.0 ac of undeveloped land. I think the existing ditch is undersized because it appears to...

I was asked to look at a concrete slab today as part of a one year warranty inspection. The slab is outdoors and its purpose is to support aluminum bleachers. The slab is basically like a big sidewalk. It is 25'x60', 4" thick, reinforced with welded wire mesh. It has control joints every 12...

You can cut grease with high pressure water. Make sure your contractor turns up the pressure and has a grease cutting nozzle on the hose. As BIMR says multiple passes will be required. Expect the contractor to ask for more money if multiple passes or heavy cleaning has not been negotiated in...

I would say we require a sidewalk needs assessment and a crosswalk assessment. We are a small community of about 30,000 and we have a small college here with a lot of student foot traffic and car traffic. In some areas we do not have sidewalks at all and cross walks are lacking in some areas...

I am writing a statement of work to contract for an A-E to evaluate sidewalks and pedestrian traffic. Anyone have experience with this?

I am an older civil engineer. I have past experince designing water, wastewater, and drainage projects the old fashioned way. I would like to learn Autocad. If possible the instruction should be web based, geared toward civil design, and cheap. Thats not too much to ask is it? Thanks in...