I have been working on a sewer line project. Part of the project is to get inverts on all the manholes. Last week I asked the town to uncover the last of the manholes. My son and I rushed out the next morning and took the inverts before the arrival of a storm. There was this one manhole that was buried about 3 feet. We had a hard time pulling the manhole cover out of the hole and even a harder time putting it back in place due to debris falling back on the rim. Yesterday I was calculating invert elevations when I noticed one manhole that the invert in was about a foot lower the the invert out.
Guess which manhole it was?
This morning we went out to the site to shoot utility locates and decided to check the inverts on that manhole. The town had covered it back up, there was a foot of new snow, it had rained the night before(weird for January) When we finally got the rod readings, I had transposed a 5.65 to a 6.56 and we were covered in mud.
I am always joking, saying a bad day in the field is better the a good day in the office. Not Today
Tip of the day!
Take 2 measurements, top of Pipe and Bottom of pipe, may help in avoiding An additional trip tot the field.
Been There, ...
Chr.
Earlier i measured all above ground and returned with a paper plan to indicate the depths.
Now i return with my fieldbook (mesa 2 and topcon field) and instead of using the external gps i use the internal to walk around the site. Open the lid, measure with the chrisnic utility, tap on the info in the points file and add this with pictures of the lid to the data collector. This has already saved me a lot of return trips (bad writing,...)
Hi Beuckie,
How does the Chrisnic tool Work, something like the pipemic (even not sure about that name!)
Groeten uit Gent!
christ lambrecht, post: 408472, member: 284 wrote: Tip of the day!
Take 2 measurements, top of Pipe and Bottom of pipe, may help in avoiding An additional trip tot the field.
If you have a rod (or tape) with feet on one side and metric on the other, read both. Convert, compare.
christ lambrecht, post: 408476, member: 284 wrote: Hi Beuckie,
How does the Chrisnic tool Work, something like the pipemic (even not sure about that name!)Groeten uit Gent!
Hi Christof,
I set my laser level in the center of a bunch of lids. Take the ref height, place the rod in the chrisnick tool. There is a distance (radius of the metal circle) to add to your values or you can set it at an angle and add a additional value. I keep the rod level and do my readings. These redings are enterd in the fieldbook.
It's great when the pipes aren't at the same level as the bottom of the manhole.
Pics on operation are te be found here http://www.chrisnik.com/pipe-mic_ii.html
For individual manholes i use a disto or a simple folding ruler.
Groetjes uit Oostham:)
christ lambrecht, post: 408472, member: 284 wrote: Tip of the day!
Take 2 measurements, top of Pipe and Bottom of pipe, may help in avoiding An additional trip tot the field.
I did, but was not sure of the pipe size, the engineer has a map showing the pipe sizes but they have a lot of mistakes. They based it off of the size of camera that fit in the pipe. I don't think they kept good track of it. They don't show anything smaller than an 8" and there are a lot of 6" pipes. I new I had the wrong foot but there was only one way to be sure whether it was a missed foot reading or transposition.
billvhill, post: 408527, member: 8398 wrote: the engineer has a map showing the pipe sizes but they have a lot of mistakes. .
There's a new one.
Easy nowadays to take a picture of the pipes to eliminate blunders.