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  2. Amsterdam Ordnance Datum - Wikipedia

    en.wikipedia.org/wiki/Amsterdam_Ordnance_Datum

    Between 1683 and 1684, he had daily measurements taken of the water level of the adjacent sea arm, Het IJ, during high tide. 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]

  3. Water supply and sanitation in the Netherlands - Wikipedia

    en.wikipedia.org/wiki/Water_supply_and...

    Water board finances and wastewater treatment levy. Water boards have the authority to levy taxes and finance their activities mostly with revenues from these taxes. The three main taxes levied by the water boards are a charge for flood protection, a water resources management charge, and a water pollution levy for wastewater treatment.

  4. List of largest reservoirs in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_reservoirs...

    Lake Powell, impounded by Glen Canyon Dam, is the second-largest reservoir in the U.S.. This is a list of largest reservoirs in the United States, including all artificial lakes with a capacity greater than or equal to 1,000,000 acre-feet (1.2 km 3).

  5. Drinking water quality in the United States - Wikipedia

    en.wikipedia.org/wiki/Drinking_water_quality_in...

    The rule mandates additional requirements for sampling tap water, corrosion control, public outreach and testing water in schools. The rule continues the requirement for replacement of lead service lines when the action level for lead is exceeded, but requires that a utility replace at least 3 percent of its lines annually, compared to 7 ...

  6. Category:Lists of schools in North America - Wikipedia

    en.wikipedia.org/wiki/Category:Lists_of_schools...

    Lists of schools in the United States (3 C, 16 P) Pages in category "Lists of schools in North America" The following 9 pages are in this category, out of 9 total.

  7. Elementary schools in the United States - Wikipedia

    en.wikipedia.org/wiki/Elementary_schools_in_the...

    By the end of the month, every public school within the United States had closed. Only schools in Montana and Wyoming opened towards the end of the school year. By the start of the 2021-22 school year the following states required in-person instruction for all or some grades: Arkansas, Florida, Iowa, and Texas. [15]

  8. Category:Schools in North America - Wikipedia

    en.wikipedia.org/wiki/Category:Schools_in_North...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  9. IJ (Amsterdam) - Wikipedia

    en.wikipedia.org/wiki/IJ_(Amsterdam)

    Map of 1681 showing the extent of the IJ Bay (on the right) prior to reclamation. Note the map is oriented with west at the top. The IJ on the painting The Return to Amsterdam of the Second Expedition to the East Indies (1599) by Hendrick Cornelisz Vroom Parade of ships on the IJ during SAIL Amsterdam in 2015