Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Seventeenth-Century Canal Ring Area of Amsterdam inside the Singelgracht' has mentioned 'Water' in the following places:
Occurrence Sentence Text Source
Contents 1 History 2 Water quality 3 Notable canals in the Canal Belt 3.1 Singel 3.2 Herengracht 3.3 Keizersgracht 3.4 Prinsengracht 4 Other notable canals 4.1 Zwanenburgwal 4.2 Brouwersgracht 4.3 Kloveniersburgwal 4.4 Brantasgracht, Lamonggracht, Majanggracht and Seranggracht 5 See also 6 References 7 External links
Known as the "grachtengordel",[5] three of the canals are mostly for residential development (Herengracht or xe2x80x98xe2x80x99Patricians' Canalxe2x80x99xe2x80x99; Keizersgracht or xe2x80x98xe2x80x99Emperor's Canalxe2x80x99xe2x80x99; and Prinsengracht or xe2x80x98xe2x80x99Prince's Canalxe2x80x99xe2x80x99), and a fourth, outer canal, the Singelgracht, for purposes of defense and water management.
Water quality[edit]
Through the mid-19th century, the water in the canals was stagnant and unsanitary, full of garbage, dead fish and feces.
[8] To remedy this, in 1879 the steam-powered pump station Gemaal Zeeburg was built to flush the canals out using water from Zuiderzee.
[10] Further attempts to improve the water quality in recent years have included legislation prohibiting houseboats from releasing waste water into the canals.
[15] However, the swimming part of the event was canceled in 2018 due to high levels of E. coli found in the water due to heavy rains the preceding weeks which overloaded the sewer system.