First-flush device
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.
[edit] First flush devices on Appropedia pages
- Rainwater catchment at Isla Urbana #First Flushes
- 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
[edit] Examples of first flush systems
- 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.
[edit] Links
- First Flush Calculations
- Saferain - Alternative to the Roof Washer
