Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Mill Network at Kinderdijk-Elshout' has mentioned 'Polder' in the following places:
Occurrence Sentence Text Source
Kinderdijk is situated in the Alblasserwaard polder at the confluence of the Lek and Noord rivers.
To drain the polder, a system of 19 windmills was built around 1740.
During the Saint Elizabeth flood of 1421, the Grote Hollandse Waard flooded, but the Alblasserwaard polder stayed unflooded.
It was decided to build a series of windmills, with a limited capacity to bridge water level differences, but just able to pump water into a reservoir at an intermediate level between the soil in the polder and the river.
The property illustrates all the typical features associated with this technology: polders, high and low-lying drainage and transport channels for superfluous polder water, embankments and dikes, 19 drainage mills, 3 pumping stations, 2 discharge sluices and 2 Water Board Assembly Houses.
Criterion (ii): The Mill Network at Kinderdijk-Elshout with its historic polder areas, high and low-lying drainage channels, mills and millraces, pumping stations, outlet sluices and Water Board Assembly Houses is an outstanding example of the development of Dutch drainage techniques which were copied and adapted in many parts of the world.
The Mill Network at Kinderdijk-Elshout, with its historic xe2x80x98high and low polder areas with natural drainagexe2x80x99, watercourses, mills and millraces, pumping stations, outlet sluices and Water Board Assembly Houses is practically unchanged.