Metres Above Ordnance Datum

[Sjk]

I suspect I may need to hire a land surveyor, however is there a way to measure a mAOD with basic (ish) equipment?

 

Google isnt giving anything away.

 

Thanks 

[PeterW]

Find an ordnance marker and work from there using a stick and a spirit level ..?

 

or someone with a Citroen C3 Cactus as the sat nav does a pretty accurate level as long as you want the closest metre...

[MikeSharp01]

If you can find an OS marker you can see from the plot you could shoot at it with a total station. Otherwise get a GPS app for your mobile phone and use that.

[Dreadnaught]

Benchmarks database…

 

 

[MikeSharp01]

Benchmarks DB is HERE

 

 

[PeterW]

31 minutes ago, MikeSharp01 said:

Benchmarks DB is HERE

 

 

 

This one is a bit more user friendly... https://www.bench-marks.org.uk/

[Sjk]

Cheers chaps, it looks like I’ll need a pro as the measurement need to be to the cm, the gps equipment is hugely expensive. 

Edited February 24, 2019 by Sjk

[TerryE]

There's nothing in the planning regs that says that you have to add to your site levels back to an ordnance survey datum. Have a look at other local planning applications. We just use a nominal datum on the street level.  At the end of the day, the planners is just want to be confident that the as-built levels are accurate and as designed relative to this street front.

[ProDave]

2 hours ago, TerryE said:

There's nothing in the planning regs that says that you have to add to your site levels back to an ordnance survey datum. Have a look at other local planning applications. We just use a nominal datum on the street level.  At the end of the day, the planners is just want to be confident that the as-built levels are accurate and as designed relative to this street front.

We did the same. Set up a "Temporary Bench Mark" which was just a row of nails hammered in to form a line on a fence post at the highest point on the site, from where laser level datums could be measured.

 

All site spot heights were then just referenced to that temporary bench mark.

[TerryE]

19 hours ago, Sjk said:

Cheers chaps, it looks like I’ll need a pro as the measurement need to be to the cm, the gps equipment is hugely expensive. 

 

You can easily get this precision to a local datum with a Dumpy.