A number of rainfall and water level gauges are located across the northern beaches. These provide information on actual rainfall and water levels in the area and will provide an indication if flooding is likely.
Keep an eye out for the following that will cause localised flooding and start to flood some roads:
  - 70mm in 3 hours (approx 20mm / hour) or
  - 150mm in 24 hours

70mm in 3hrs and 150mm in 24hrs

Manly Hydraulics Laboratory (MHL) is working with the Northern Beaches Council to provide up to date information on current weather conditions. This information will also help the council manage flood and coastal risks.