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[[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.
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 ==
== First flush devices on Appropedia pages ==


* [[Original:Rainwater_harvesting#First flush systems]]
* [[Rainwater catchment at Isla Urbana #First Flushes]]
* [[Rainwater harvesting#First flush systems]]
* [[Old Growth Cellar rainwater catchment #First flush bucket]]
* [[Old Growth Cellar rainwater catchment #First flush bucket]]
* [[Original:Ersson rainwater harvest and purification #Roofwashers]]
* [[Ersson rainwater harvest and purification #Roofwashers]]
* [[WaterPod FBD Rainwater Purification #Description of Final Project]]
* [[WaterPod FBD Rainwater Purification #Description of Final Project]]
* [[Daycare rainwater catchment system#The First Flush Sediment Trap]]
* [[Daycare rainwater catchment system#The First Flush Sediment Trap]]
* And all of those linked below in the gallery.


== Examples of a redesigned first flush ==
== Examples of first flush systems ==


<Gallery caption="Various First Flush Systems">
<Gallery caption="Various First Flush Systems">
File:RWH7.jpg|[[Original: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:First Flush.jpg| [[Rainwater catchment at Isla Urbana]]<br>208 liter first flush with floating ball
File:Firstflushassembly.JPG|[[Old Growth Cellar rainwater catchment #First flush bucket|Old Growth Cellar]] <br> 15 gallon first flush tank with side drilled.
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:Smart-Valve_in_4in_cleanout.jpg|[[Original: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:Firstflushassembly.JPG|[[Old Growth Cellar rainwater catchment #First flush bucket|Old Growth Cellar]]<br>15 gallon first flush tank with side drilled.
File:FBDsystem.jpg|[[WaterPod FBD Rainwater Purification #Description of Final Project|Waterpod Rainwater Filtering]] <br> See 2) Ball Valve 3) First Flush  
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: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:FBDsystem.jpg|[[WaterPod FBD Rainwater Purification #Description of Final Project|Waterpod Rainwater Filtering]]<br>See 2) Ball Valve 3) First Flush
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: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: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:Diseno1.JPG|[[HSU Chiapas rainwater catchment#Juan Hidalgo.27s demonstration house|HSU Chiapas Rainwater]]<br>Old design that leaked replaced by next image.
File:IMG_0024.JPG|[[CCAT_rainwater_catchment_system#First_Flush_Catchment_System|CCAT Rainwater]]<br>First flush with clear pipe.
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.
File:LasMalvinasfirstflush2014.jpg|[[Las Malvinas rainwater 2014]]<br>First flush using a large white pipe.
</gallery>
</gallery>


==Links==
== Links ==
*[[Basic_rainwater_collection_calculations#First_Flush_Calculations|First Flush Calculations]]
 
*[http://www.saferain.com.au/harvesting.htm Saferain] - Alternative to the Roof Washer
* [[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
}}


[[Category:Rainwater]]
[[Category:Rainwater]]

Latest revision as of 13:06, 23 October 2023

Firstflushassembly.JPG

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]

Examples of first flush systems[edit | edit source]

Links[edit | edit source]

FA info icon.svg Angle down icon.svg Page data
Keywords rainwater
SDG SDG06 Clean water and sanitation
Authors Lonny Grafman
License CC-BY-SA-3.0
Language English (en)
Translations Korean, Indonesian
Related 2 subpages, 6 pages link here
Aliases First flush
Impact 1,071 page views
Created April 24, 2007 by Ajay Tallam
Modified October 23, 2023 by Maintenance script
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