| CPC G08B 21/10 (2013.01) [G01S 19/42 (2013.01); G08B 3/10 (2013.01); G08B 31/00 (2013.01)] | 20 Claims |

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1. A flood warning apparatus comprising:
a foundation configured to mount to a ground;
an extendable body that extends above the foundation, wherein the extendable body is configured to move within a range bounded by a minimum body height and a maximum body height, and wherein the extendable body is configured to have a position within the range based on a level of water in a waterway that covers the foundation;
a platform disposed atop the extendable body, wherein the platform comprises a retention feature, and wherein the platform is buoyant; and
a floatation object comprising a notification mechanism, wherein the floatation object is configured to be retained by the retention feature of the platform when the position of the extendable body is less than the maximum body height, wherein the floatation object is further configured to be released from the platform by the retention feature when the level of water in the waterway exceeds a threshold value, wherein the floatation object is buoyant, and wherein the notification mechanism is configured to activate when the floatation object is released from the platform by the retention feature.
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