Editing First-flush device

[[File:Firstflushassembly.JPG|thumb]]

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 ==

* [[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 ==

<Gallery caption="Various First Flush Systems">
File:First Flush.jpg| [[Rainwater catchment at Isla Urbana]]<br>208 liter first flush with floating ball
File:RWH7.jpg|[[Rainwater harvesting#First flush systems|Practical Action Rainwater Harvesting]]<br>a) the tipping gutter first flush system and b) the floating ball first flush system.
File:Firstflushassembly.JPG|[[Old Growth Cellar rainwater catchment #First flush bucket|Old Growth Cellar]]<br>15 gallon first flush tank with side drilled.
File:Smart-Valve_in_4in_cleanout.jpg|[[Ersson rainwater harvest and purification #Roofwashers|Ersson's roofwasher]]<br>a hollow ball which, when filled by the initial flow of water, seats itself onto a rubber gasket.
File:FBDsystem.jpg|[[WaterPod FBD Rainwater Purification #Description of Final Project|Waterpod Rainwater Filtering]]<br>See 2) Ball Valve 3) First Flush
File:Lluvia_filtro_firstflush1.jpg|[[Daycare rainwater catchment system#The First Flush Sediment Trap|Parras Mexico Daycare Rainwater]]<br>The first flush is caught by 4" pipe with a floating ball.
File:Diseno1.JPG|[[HSU Chiapas rainwater catchment#Juan Hidalgo.27s demonstration house|HSU Chiapas Rainwater]]<br>Old design that leaked replaced by next image.
File:Diseno2.jpg|[[HSU Chiapas rainwater catchment#Juan Hidalgo.27s demonstration house|HSU Chiapas Rainwater]]<br>New design that use two parallel lengths of pipe.
File:IMG_0024.JPG|[[CCAT rainwater catchment system#First Flush Catchment System|CCAT Rainwater]]<br>First flush with clear pipe.
File:AlmostFinal.jpeg|[[Zane Middle School rainwater catchment]]<br>First flush using a small pickle barrel.
File:Con15 (1).jpg|[[CCAT greenhouse rainwater catchment]]<br>First flush using a long black pipe.
File:IMG_3379.jpg|[[Loleta Elementary rainwater]]<br>First flush using a small section in a long white PVC pipe.
File:Water_enters_the_black_hole.jpg|[[Sanctuary rainwater]]<br>First flush using a blue 20 gal barrel.
</gallery>

== Links ==

* [[Basic rainwater collection calculations#First Flush Calculations|First Flush Calculations]]
* [http://web.archive.org/web/20130623014505/http://www.saferain.com.au:80/harvesting.htm Saferain] - Alternative to the Roof Washer

{{Page data
| keywords = Rainwater
| sdg = SDG06 Clean water and sanitation
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[[Category:Rainwater]]