Rain Harvesting First Flush Diverters 3" WDDS99 / WDDP01 / WDDP11 / WDDP111

Description

From the manufacturer:
Sold in kit form for easy installation and customisation, our first flush diverters play an essential role in protecting your rainwater quality. By isolating the first flush of contaminant- laden water before it reaches your tank, they keep organic and inorganic fine particles out of the rainwater you harvest so you enjoy the benefits of cleaner rainwater for your property.
First Flush Plus
First Flush Diverters
Protect your rainwater quality by diverting the most contaminated water that washes off your roof with the first few millimetres of rainfall using the Rain Harvesting First Flush Plus.
Size 100mm [4" Sewer Dimension Pipe]  WDDP11
Install with ease
Supplied in kit form, the first flush diverter can be installed on your downpipes with a simple T junction. Simply add and install the length of pipe required to meet your diversion needs. This will be based on the volume of dirty, contaminated water you wish to divert.
Improve your water quality
Help prevent hazardous organic and inorganic particles from contaminating your rainwater by diverting and discarding the most particle-laden water from your roof. This first flush diverter captures the first flush of rainfall so you get better quality water in your tanks.
Use your diverted water
The water you divert is automatically released through the slow release valve. You can empty this water into a standard drip irrigation system for use around your garden or you can direct it into stormwater drainage. The choice is yours.
Calculate your diversion needs
Generally speaking, the more water you divert, the better the quality of the rainwater that ends up in your tank. However, diverting more rainwater than necessary can lead to volume shortages, so it’s important to calculate your diversion needs, and divert water accordingly.
The following formulas offer general guidelines for calculating how much water you should divert:
Areas with low pollution (open fields, no trees, no bird droppings or animal matter, clean environment) = divert 0.0121 gallons of water per square foot of roof
Areas with higher pollution (leaves and debris, bird droppings, animal matter/carcasses, pollution) = divert at 0.0242 gallons of water per square foot of roof
This calculation will allow you to determine what length and size pipe or pipes you need for your diversion chambers.
The length of pipe required to form your first flush diversion chamber will depend upon how much water you need to isolate and capture.
The following measurements are given as a guide only.
3 feet of 3″ pipe = 1.5 gallons
3 feet of 4″ pipe = 2 gallons
3 feet of 12″ pipe = 19 gallons