sentences:  The Irvine is tidal as far as the nature reserve at Shewalton, half-a-mile (800 m) or so upstream from the confluence with the Annick Water.The main contributing rivers and rivulets in descending order of their confluences are therefore the Glen Water, Polbaith Burn, Cessnock Water, Kilmarnock Water, Carmel Water, Annick Water, and the Garnock.Many watercourses have changed direction over the years for various reasons.