Section 03 · 5 entries
Hydrography
Channels that move faster than the sheets recording them.
A channel surveyed on the ground and a channel compiled from air photographs do not agree, and neither office will call the other wrong. The register records the separation and leaves both centrelines standing.
Photo: Altaf Shah / PexelsEntries in Hydrography
Ref · subject · read- 011 One river, two official coursesA channel surveyed on the ground and a channel compiled from air photographs do not agree, and neither office will call the other wrong. The register records the separation and leaves both centrelines standing. 6 min
- 012 Blue lines that only run after rainIntermittent channels, the dashed convention, and how much of the network is conditional. 2 min
- 013 The gaugeOne point on the reach where both surveys agree, because it is the point both are tied to. 2 min
- 014 Mean stageA river's edge is drawn at a level it is at only some of the time. 2 min
- 015 A cut-off bendThe old channel stays legible in the crop long after the water has gone. 2 min