Apparent Inconsistancy This sentence He found that the water level at an average summer flood in the sea arm when the water level reaches its maximum not counting storms was about the same as the level on the other side of the seadike plus the margin of 9 feet and 5 inches appears to read that at average summer flood the water level in the Ij the sea arm also sea inlet below was 9 ft 5 inches higher than in the Amsterdam canals This following sentence The waterlevel in the canals of Amsterdam which is quite constant called Amsterdam Peil AP equaled the level at summer flood at sea in the sea inlet which changes throughout the year seems to contradict that Is this a translation problem or should this article be pulled It really says little about NAP