Draughtsman: [Yeakell, Thomas Jr.]
Medium: Pen and ink on paper
This drawing shows the estuary of the River Welland flowing into the Wash.
Downstream of Stamford, towards the fens, the river is embanked to create ‘high level’ channels. Tidal exclusion sluices are indicated along the coast at the top of the sheet. These were constructed to maintain water levels for irrigation and to restrict saline water. Drains across fens and marshland are highlighted in blue in the lower part of the plan. At top right, the surveyor's notes on angular observations are clearly visible.