For large tidal rivers and estuaries add half to 1 hour to the river mouth's coastal time for the first mile from the sea and about 10 minutes for each extra mile up-river.
Kwimilambo yozalo rhoxo olukhulu nakumachweba emilambo dibanisa isiqingatha kwiyure enye kumlomo womlambo kwixesha lonxweme kwimayile yokuqala ukusuka elwandle kwaye malunga nemizuzu elishumi ngemayile nganye elisalela phezulu emlanjeni.