Elevations range between 114m AOD to 54m Above Ordnance Datum with many ridges and folds in the land creating an undulating terrain.
12.
When the river Ouse reaches a level of 7.4m above ordnance datum, the staff at the barrier are alerted.
13.
Prior to the development, tidal levels on the Bow Back Rivers reached above ordnance datum ( AOD ) on spring tides.
14.
There is a spillway at the southern end of the dam, with an overflow level at above ordnance datum ( AOD ).
15.
At 300m from the village is Bibury Farm, 151m above Ordnance Datum, which is a similar elevation to much of the north.
16.
The new sluice was wide, and the cill level was below Ordnance Datum, some lower that the original sluice constructed in 1795.
17.
The parish has many footpaths and rises from 2m above mean high tide at the River Arun to 68m above Ordnance Datum along some of its north edge.
18.
This stretch of the valley is broad and flat bottomed with the valley bottom being around 50m above ordnance datum and the sides rising to 150m above ordnance datum.
19.
This stretch of the valley is broad and flat bottomed with the valley bottom being around 50m above ordnance datum and the sides rising to 150m above ordnance datum.
20.
In the UK, the Ordnance Datum ( the 0 metres height on UK maps ) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921.
