A method is provided for controlling the fluid level in an ebb and flow watering system control bucket that is in fluid communication with at least one fluid holding apparatus such as a plant container with connecting water lines, causing hydraulic delays in changes in the fluid level in the control bucket when fluid is pumped to or from the control bucket, typically from a fluid reservoir. The method involves pumping fluid to or from the control bucket to achieve a target fluid level in the control bucket; upon the fluid reaching the target fluid level, starting a timer for a short period of time to allow for the hydraulic delays, and continuing to pump fluid while the timer runs; restarting the timer and continuing to pump fluid if the fluid level in the control bucket recedes from the target fluid level; and discontinuing pumping if the timer runs for the full period of time.

A method for delaying the maximum rate of discharge of water from a stormwater retention basin includes varying the vertical distance of an intake opening from the waterline inversely with water depth. A flow control device for carrying out the method includes an intake pipe with an intake opening that is pivotally mounted to a float body, the pivot being spaced from the intake opening.