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[edit | edit source]
- Rainwater catchment at Isla Urbana #First Flushes
- Rainwater harvesting#First flush systems
- Old Growth Cellar rainwater catchment #First flush bucket
- Ersson rainwater harvest and purification #Roofwashers
- WaterPod FBD Rainwater Purification #Description of Final Project
- Daycare rainwater catchment system#The First Flush Sediment Trap
- And all of those linked below in the gallery.
Examples of first flush systems[edit | edit source]
- Various First Flush Systems
Rainwater catchment at Isla Urbana
208 liter first flush with floating ball
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.
Zane Middle School rainwater catchment
First flush using a small pickle barrel.
CCAT greenhouse rainwater catchment
First flush using a long black pipe.
Loleta Elementary rainwater
First flush using a small section in a long white PVC pipe.
Sanctuary rainwater
First flush using a blue 20 gal barrel.
Las Malvinas rainwater 2014
First flush using a large white pipe.
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Links[edit | edit source]
- First Flush Calculations
- Saferain - Alternative to the Roof Washer