WaReg® Flow Regulator

Flow regulation
Surface water flooding

We know that stormwater runoff in intensive storms can cause flooding. By utilizing effective flow regulation we know that flooding can be minimized and even mitigated. Our team of engineers had one thought in mind whilst designing the new WaReg 3.0. Creating the perfect flow regulator for real-life situations. 

  • Decreases the need for large attenuation ponds
  • Autonomous
  • Insensitive debris, sludge and solids

By utilizing the retained water levels, we are able to ensure a constant flow rate through the WaReg Flow Regulator.  Using this method of regulation we eliminate the need for a head of water, thereby reducing the requirements for civil construction.  WaReg therefore reduces the overall cost of a flood mitigation project. We know most municipalities are dealing with reduced maintenance budgets.  This increases the need for products with lower maintenance requirements.  Building this into our design we have constructed the WaReg with a constant open outflow area reducing blockages.

WaReg operates as a standard inspection chamber during normal levels of flow.  When a rain events occurs the WaReg automatically begins to regulate the flow, right from the first drop.  WaReg doesn’t require a certain velocity to regulate - WaReg protects instantly.

Our engineers at Wapro have worked hard to design a flow regulator that is infinately more efficient than the common vortex design, and over and above that, have designed the WaReg to enable asset owners to adapt flow rates post-installation.  All with an ambition to provide the best solution to keep people and property safe.


WaReg functions autonomously controlling flow through the chamber.

Water flows through the chamber, without hindrance, under normal operating conditions. The downstream pipes have capacity for the current flow without risk for overloading.  The whole area of the inlet pipe is open for flow and the whole area of the outlet is open constantly.

When flow increases the chamber fills with water causing the flotation regulation pipe to rise thereby regulating flow. When the maximum flow has been attained the inlet restricts flow to ensure the level in the chamber remains constant and flow out of the chamber remains at the predetermined level.

Hydraulic ReSponse Curve

When designed WaReg 3.0, we at Wapro focused on building a solution which eliminated the common problems associated with the products currently used for flow regulation.  One such problem is the hydraulic response curve.  In vortex chambers this curve exhibits an ‘s-bend’.  The WaReg, due to not requiring a head of water to regulate, is able to reach maximum flow earlier, which means that more water can be effectively released reducing the requirements for attenuation upstream.  Reaching maximum flow quickly also dramatically reduces the risk of upstream flooding. Adjustable flow rates The one thing we can be certain of is change.  We know that the climate is changing, and that the areas we live in a constantly changing, growing.  The engineers here at Wapro have taken change to heart and had this ‘top of mind’ whilst designing WaReg 3.0.  The ability to adjust flow rates post installation increases the longevity of the flow regulator.  When conditions change, the WaReg can be adjusted to adapt to the change in requirements.  The thought process behind this function was solely to provide the best product to suit todays climate as perfectly as tomorrows climate.  Creating a product with a long life expectancy without making it adjustable to the potential changes during the same period would be counter effective.    In the example below for NPS 4" WaReg, flow rates can be adjusted between 50 GPM - 140 GPM.


WaReg® suits most applications and it is available from NPS 3" - NPS 16" for flow from 15 GPM to 3900 GPM. WaReg® models up to NPS 12" are tested for flow by us at Wapro to insure the correct flow rate is set before delivery. The flow rate can be adjusted post-installation within a certain range.



Article number NPS Imperial Shop Drawing (PDF) Shop Drawing (DWG) Technical Specification
WR110 4" PDF PDF pdf
WR160 6" PDF PDF pdf
WR200 8" PDF PDF pdf
WR250 10" PDF PDF pdf
WR315 12" PDF PDF pdf
WR400 16" PDF PDF pdf
WR75 3" PDF PDF pdf

Wapro protects against overloading in sewerage and stormwater systems.  By using WaReg flooding can be avoided by using an attenuation  reservoir, or by directing flow to a less sensitive area.    The throughput area in the pipe is regulated by the water level in the chamber.  In normal flow conditions the entire pipe is open, allowing the chamber to act as an inspection chamber.  When a rainfall event occurs and flow increases, the inlet  of the WaReg gradually closes to regulate the flow.  Protecting from the first drop.

To provide peace of mind we have designed WaReg with zero need for head pressure to initiate regulation.  The design team have ensured that WaReg is insensitive to debris, sludge and solids normally found in stormwater drains.  We have designed a product to work in real life situations, with all that this encompasses. The ability to make post installation adjustments ensures that WaReg is future proof.  We don’t know what the future holds, but the potential for increased hard surface areas, and increased precipitation are fairly safe bets.  We at Wapro strive to ensure your investment will protect future generations.

Advantages of WaReg for flow regulation

  • Automatic flow control in gravity fed networks to minimize the risk of overloading.
  • Autonomous - flow is regulated by the WaReg Mechanism
  • Lower risk of blockage and obstructions compared to vortex chamber
  • Easy to install, even in existing systems
  • Uncomplicated and easy maintenance
  • Precise flow through gravity fed systems

1. Regulating flow to pump stations, treatment plants and oil separators Regulating flow to a treatment plant ensures an even flow, creating an environment for the treatment process.  During periods of heavy rainfall excess water is directed to an attenuation reservoir.  As the flow decreases the WaReg allows controlled flow out of the reservoir for optimization of the plant and no emergency dumping is required.  

2.  Regulating flow in stormwater and sewer lines By regulating the flow in the sewer system through magazines, you get a smoother inflow. Flow control is used to delay the flow of storm water and to avoid temporary overloads. Stormwater inflow is regulated and delayed in delay magazines, ponds or natural magazine such as natural land, ditches or other insensitive areas. By controlling and regulating the drainage through wetlands, flood irrigation beds, irrigation ponds and other natural treatment plants WaReg can be an easy and natural way to reduce emissions of pollution into lakes and streams.

3.  Regulating flow in open attenuation WaReg accurately regulates the flow through open attenuation ponds irrespective of upstream water levels.  Flood sensitive areas can be protected by directing flow to less sensitive areas during periods of high rainfall. Models We have designed WaReg to suit most application and it is available from DN75 - DN400 for flow from 1l/sec to 250l/sec.  WaReg models up to DN315 are tested for flow here at Wapro to insure the correct flow rate is set before delivery. The flow rate can be adjusted post-installation within a certain range. See the technical specification for details.

We at Wapro believe in enabling. By being an open organization we learn from, and share with, our customers. Below you’ll find that there is a wealth of information in relation to not only our products, but also other useful and interesting information to help you in your role. If you require any further information please don't hesitate call us. We’re here to help you stop flooding.


Technical Documentation

Technical drawings can be downloaded from the Dimensions and Technical Drawings tab. For your ease, you'll find other related information available for download below.

Certifications and Approvals

WaReg is currently undergoing testing.


WaReg Flow Regulator is simple to install and can be installed inline with slide or flexible couplings.

A testing procedure is undertaken at Wapro to ensure that each flow regulator leaves Wapro facility with properties ordered. Testing procedure is made with flow control meter and registered for each product manufactured.

Wareg modulus is tested in a test-chamber according to same test procedures as a complete Wareg product.

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