The landing continued, but manual braking did not commence until the aircraft was over 5,200 feet down the runway. The aircraft then began to aquaplane and skid its way down the runway, departing substantially from the runway centreline. Company standard operating procedures mandated that idle reverse thrust should be used for landings and that flaps should be set at 25 degrees, not the maximum of 30 degrees. The combination of flaps 25, no auto-braking, no reverse thrust, a high and fast approach, a late touchdown, poor Cockpit Resource Management, and the standing water on the runway led to a runway overshoot.