Overland Flow (Surficial Runoff)

The most common pathway for contaminants to reach a waterway is by runoff over the ground as overland flow. As the soil and groundwater is bypassed by this process, nutrients are not able to be utilised or particulates entrained resulting in nutrients, sediment, and microbes being deposited directly into a waterway.

This section looks at a number of ways to reduce contaminants entering waterways from overland flow, by minimising the risk of loss from the land and/or intercepting runoff to reduce the amount of contaminant transported in the water. This section has been separated into three key actions:

  • Land management
  • Interventions
  • Overall farming strategies
Contaminants are transported quickly over the land surface by overland flow.