Long Lag Time

• A reason for the long lag time may be due to the rain being intercepted by vegetation, slowing it down.
• The water may also have infiltrated and be stored in the soil.
• There may be a low number of tributaries transporting water to the channel slowly.
• It may be a large drainage basin meaning more travel time to the main channel.
• The area may be gently sloping leading to slower surface run-off to the channel.