First-flush device: Difference between revisions

The purpose of a first-flush device or first flush diverter is to prevent the entry of debris and toxins into the storage/distribution system of a rainwater catchment system.

First flush devices on Appropedia pages

• Original:Rainwater_harvesting#First flush systems
• Old Growth Cellar rainwater catchment #First flush bucket
• Original:Ersson rainwater harvest and purification #Roofwashers
• WaterPod FBD Rainwater Purification #Description of Final Project
• Daycare rainwater catchment system#The First Flush Sediment Trap

Examples of first flush systems

• Various First Flush Systems
• 

  Practical Action Rainwater Harvesting
  a) the tipping gutter first flush system and b) the floating ball first flush system.

• 

  Old Growth Cellar
  15 gallon first flush tank with side drilled.

• 

  Ersson's roofwasher
  a hollow ball which, when filled by the initial flow of water, seats itself onto a rubber gasket.

• 

  Waterpod Rainwater Filtering
  See 2) Ball Valve 3) First Flush

• 

  Parras Mexico Daycare Rainwater
  The first flush is caught by 4" pipe with a floating ball.

• 

  HSU Chiapas Rainwater
  Old design that leaked replaced by next image.

• 

  HSU Chiapas Rainwater
  New design that use two parallel lengths of pipe.

• 

  CCAT Rainwater
  First flush with clear pipe.

Links

• First Flush Calculations
• Saferain - Alternative to the Roof Washer