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 a redesigned first flush
- 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