Prinsengracht The canals served for defense, drinking water administration and transport. The defenses took the form of a moat and earthen dikes, with gates at transit points, but usually no masonry superstructures. A major turning issue in the event on the Amstel river mouth was the All Saint's Flood of http://bilddee.de/so-pflegen-und-warten-sie-ihren-sackkarren-richtig/