Rain Harvesting First Flush Diverter for In Ground Systems
The Rain Harvesting In-Ground First Flush water diverter improves rainwater quality and safety, helps extend the life of pumps (used for irrigation and other domestic purposes), and also internal appliances that draw upon rainwater (such as laundry, toilets, and dishwashers) and reduces tank maintenance. Requires 4" pipe for chamber. 3" or 4" inlet.
- Isolates up to 80 gallons of the first flush of contaminant-laden water from your roof, by keeping organic and inorganic fine particles out of the rainwater you harvest.Isolates the first flush of contaminant-laden water from your roof, by keeping organic and inorganic fine particles out of the rainwater you harvest.
- By allowing you to determine the frequency and duration of first flush, the Advanced Release Valve ensures that the Delta’s first flush diversion is optimized. The transparent, rapid release exit funnel reduces build up and blockages while allowing for easy visual inspection.
- In addition to acting as a first flush diverter, this diverter also allows a "wet" system to be converted into a "dry" system. Firstly, due to the size of the buildings or the placement of the tank being away from the buildings, meaning that there are long runs of pipe underground leading to a riser at the tank. Secondly, to reduce the water from freezing, it is diverted below the freezing level of the ground in cold climates.
- On a sloping site, this diverter ensures the water empties out The result - a "dry" system that saves water and improves water quality.
- Requires 2 new 1.5 volt AAA batteries and six sections of 4" Schedule 40 PVC pipe which can be purchased online or at a local plumbing supply.
Product Details
🌧️ Rain Harvesting WDIG10 In-Ground First Flush Water Diverter 4" Pipe
💧 Maximize Water Quality with Subsurface First Flush Technology
The Rain Harvesting WDIG10 In-Ground First Flush Diverter is designed to deliver cleaner rainwater to your tank by diverting the initial, most polluted runoff. Installed below ground, it preserves the aesthetics of your property while providing essential protection for your rainwater harvesting system.
📏 Key Features
Model: WDIG10
Application: In-ground installation for 4" (100mm) round downpipes
Material: UV-stabilized PVC for durability underground
Capacity: Adjustable first flush volume based on diverter pipe length
Ball and Seat Mechanism: Resets automatically after each rain event
✅ Benefits
Cleaner Tank Water – Diverts roof contaminants like dust, leaves, and debris before they reach the tank
Subsurface Installation – Hidden design maintains a clean and tidy appearance for your system
Adjustable Volume – Easily customize the diverter capacity to match catchment area and rainfall intensity
Low Maintenance – Simple, accessible clean-out for long-term performance
Durable Construction – Built with UV-stabilized materials for extended underground lifespan
🔧 Installation Overview
Excavate a small pit below your downpipe or stormwater line
Connect the WDIG10 diverter inline with a 4" (100mm) pipe
Extend the diverter pipe length to set the desired first flush volume
Cover and landscape over the diverter access lid for a seamless look
📦 Shipping & Handling
Ships individually boxed with necessary fittings
Shipping weight: approximately 6 lbs
Delivered via standard ground service