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The scale of dBZ values can be seen along the bottom of the image. dBZ is a logarithmic dimensionless technical unit used in radar.It is mostly used in weather radar, to compare the equivalent reflectivity factor (Z) of a remote object (in mm 6 per m 3) to the return of a droplet of rain with a diameter of 1 mm (1 mm 6 per m 3). [1]
The calculated averaged was called the Amsterdams Peil ("Amsterdam level", AP) and used to calculate the minimum height of the sea dykes, which he set at "9 feet and 5 inches" (2.67 m) above AP. [2] In 1850, the datum was used at several places in Belgium, and in 1874 the German government adopted the datum for first-order levelling. [3]
The old rule "Whom the water hurts, he the water stops" (Wie het water deert, die het water keert) meant that those living at the dike had to pay and care for it. This led to haphazard maintenance and it is believed that many floods would not have happened or would not have been as severe if the dikes had been in better condition. [ 7 ]
Half hours are relative to the next hour – for example, 5:30 is said as "half 6". Quarter hours are expressed relative to the nearest whole hour – for example, 6:15, "kwart over 6" (quarter past six) and 6:45, "kwart voor zeven" (quarter to seven). Minutes are usually rounded off to the nearest five minutes and are expressed relative to the ...
The Delta Works (Dutch: Deltawerken) is a series of construction projects in the southwest of the Netherlands to protect a large area of land around the Rhine–Meuse–Scheldt delta from the sea.
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The design proposed by the successful contractor to meet this criterion will see a further increase in the height of the dam, by approximately 2 metres. [2] The Afsluitdijk is a fundamental part of the larger Zuiderzee Works, damming off the Zuiderzee, a salt water inlet of the North Sea, and turning it into the fresh water lake of the IJsselmeer.
The IJsselmeer [a] (Dutch: [ˌɛisəlˈmeːr] ⓘ; West Frisian: Iselmar, Dutch Low Saxon: Iesselmeer), also known as Lake IJssel in English, [3] is a closed-off freshwater lake in the central Netherlands bordering the provinces of Flevoland, North Holland and Friesland. It covers an area of 1,100 km 2 (420 sq mi) with an average depth of 4.5 m ...