If puddles form or runoff occurs on the lawn before a one-inch depth is reached in the can, adjust the watering rate.
(puddles form or runoff; occurs; L:on the lawn; T:before a one-inch depth is reached in the can) (a one-inch depth; is reached; L:in the can)
puddles form or runoff a one-inch depth
occurs is reached
L:on the lawn T:before a one-inch depth is reached in the can
L:in the can