Abstract: A control apparatus controls a timer activated irrigation system. A catch pan has a vertically extending wall and a floor. The wall defines a top thereof. The wall and floor define a basin. The catch pan has an overflow construction into which water from the basin can flow. The catch pan is pivotally mounted about a substantially horizontal axis. A biasing structure is adapted to bias a portion of the catch pan spaced from the pivot upwardly. When water in the basin is below a selected depth the upwardly biased portion of the catch pan rotates upwardly into a first orientation. When water in the basin is at least the selected depth the upwardly biased portion of the catch pan rotates downwardly into a second orientation. Water collecting structures collect irrigation water and rain water and deliver them to the basin. A cover structure prevents rain from flowing into the basin other than via the rain collecting structure.