Just as water levels in the River Shannon are keenly watched by farmers in the west of Ireland, levels in Lake Ontario are the issue for farmers in the provinces of Ontario and Quebec in Canada. Exceptionally heavy rainfall recently has left water levels in the lake at a 24-year high and more heavy rain was forecast until this weekend. Planting of spring crops is usually in full flow during the first week of May, but machinery is parked up, even in the most free-draining land.