Recent content by martin888888

Yes, potholing is always subcontracted out and not part of the survey scope, I misstated it in my original comments. However a surveyors job is to research parcel maps and asbuilt information along with picking up utility structures (IE. Manholes) in order to create a base map that is accurate...

I agree MotorCity, the asbuilts are simply supplemental information to help them get an understanding of what might be out there. By no mean held to a level of accuracy and I think most surveyors understand that. He also asked us to bring control into the site for him - Kidding. Yea, I will...

Hello, I just got a general question from an issue we just went through and am interested to hear feedback on this. I have done work in at least 20 states and 5 countries in my career and have never seen this happen before. We scoped for a surveyor to do a topographic survey, including...

Great points, thank you guys. The main issue here however is if the HDPE pipe flows full will it put it in a vacuum situation that could possibly cause cavitation of the pipe.

Thanks pennpiper. Its located in Iowa and we have anchor details and parameters for protection. Main issue we are working through is effect of air lock on the system. Which I believe has no effect.

Thanks for the response. The initial 4.5% pipe will not have capacity for our design flows and will flow full under large (25yr) storm events. As you said the steeper pipes have plenty of capacity. I guess there is concern that the condition of not having air in the pipeline will cause issues.

Hello, We are proposing 600' of fused HDPE (SDR 17) pipe that will be placed above ground for storm water conveyance. Due to ground conditions a bury is not possible. From the inlet we are looking at a initial 200' run of pipe at a 4% slope, with a slope of 11% to 15% in the remainder of the...

No this is strictly lateral flow through porous media. Even 35 year experts at our company are getting stumped by this.

We have a situation where we are designing an underground (roadway on top of it) limestone rock outfall (150'L x 20'W x 4'D) that will transfer water from a pond for treatment. At the end of the rock outfall we will have a culvert to discharge flows downstream. The culvert is easy enough to...

We have a situation at a mine site where we are designing a underground (roadway on top of it) limestone rock outfall (150'L x 20'W x 4'D) that will transfer water from a pond for treatment. At the end of the rock outfall we will have a culvert to discharge flows downstream. Easy enough to...

thanks. The 2 large culverts are feeding a 16ac pond however. 1/2" steel orifice plate or concrete wall type structure with slot cut will probably do it.

I have an existing 84" culvert that I need to install an orifice plate on to control flows. Has anyone ever constructed anything like this before? Would an orifice plate of this size tend to warp under water pressures over time?

When calculating headwater of a culvert does the size upstream basin within the roadside ditch come into play? As an example, if you have 5cfs of flow into 12" culvert and you calculate that the headwater would be 1ft above the crown of pipe. Would this 1ft calculation differ if you have a 10%...

Hello, I am designing a running track as a volunteer for an elementary school. 1/8 mile oval track with a 12' wide concrete running surface (will be overlay with a poly surface down the line). The section for the track I used is a 4" thick concrete section with rebar. Would calling out...

Hello, Would anyone know of a good program to help with design of an asphalt pavement section for a commercial driveway? I have heard that AASHTO has one but cant seem to find it. What I am trying to do is verify a 4"/10" section that was put on a set of plans with truck traffic and subgrade...