Radio Data Networks Limited

Radio Data Networks Limited

CSO Level and Blocked Sewer Detection - Alarm - Mitigation

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The DAM (Detect - Alarm - Mitigate) Concept for CSOs and Blocked Sewers For too long CSO (Combined Sewer Monitoring) and BSD (Blocked Sewer Detection) has been nothing more than recording events and informing authorities about an incident. Seldom has something proactive been done to prevent or to mitigate an incident.

DAM (Detect – Alarm – Mitigate) is not a new concept but one that we have been promoting in conjunction with our partners at Environmental Innovations and Containment News to coincide with the EU driven improvements in bathing water standards under which many beaches could loose their crucial Blue Flag status.

Key to the successful application of DAM is speed. With DAM no longer is it possible to accept traditional 30-minute sampling rates and hit and miss communications using cellular networks. DAM requires dependable virtual real-time communications and fast sampling rates measured in seconds.

The combination of our BDT technology and power efficient RDN1000 transmitters permits us to deliver just that!

The typical BDT detects is woken every 2.5 seconds and can be read in just a few ms. The data from a BDT can be broadcast over a variety of wireless media for drive-by and fixed network operation.

Drive-by operation is typically used for blocked sewer detection where the current state of the sewer can be read from above ground without having to stop traffic, close roads, etc to remove the manhole covers. With fixed networks the same data is intercepted and broadcast back to a base station for real-time processing, using our BDT booster, where decisions can be made to call out emergency sewer un-blocking and tanker teams, before for example a sewer blockage results in a spill/surcharge.

The ultimate system is where the real-time data is used to proactively close off a CSO discharge point to prevent the blocked sewer incident resulting in a dry weather spill.

BDT Based Blocked Sewer Detection

The RDNET1000 BDT blocked sewer detection systems opens up new opportunities for utility and private estate owners to become proactive in reducing pollution incidents relating from blocked sewers and dry weather CSO spills.

Firstly, with a sampling rate of < 2.5 seconds the BDT is able to detect even short duration surcharges events which have previously gone undetected. Secondly, the real-time response permits the event to be cross-correlated live with rainfall data in the catchment area, instantly generating an alarm whenever there is the threat of a dry weather spill. Finally, with advanced low power valve technology like the Environmental Innovations FlapstopperTM, dry spill events can be contained buying time for drain un-blocking and tanker teams to arrive. Download data CSO Spill and Blocked Sewer Detection System

BDT Data Interface/ Receiver Station

The Data from each BDT is normally presented via a set isolation relays with matching status LEDs at a single or multiple remote locations or as a bleep / LED status on a hand held vehicle based receiver.

On telemetry receivers the BDT states include BDT in air, BDT in water/sewage. BDT cable cut/damaged /fault and communications status.

The use of relays means that the BDT receiver can be interfaced with any existing third party telemetry systems, RTU, alarm system, without the need for interface drivers and firmware, etc. This makes the BDT telemetry system very popular with water utilities who locate the BDT receiver stations at existing pumping stations, etc to take advantage of existing communication and control channels.

BDT Booster/Repeater

This is a unit that intercepts the “drive-by” wireless transmissions emitted by the BDT and re-broadcasts them over a wide area “private” network.

We offer the choice of Low Power Radio or through our work with Ofcom access to our National or Regional PMR radio network.

BDT booster units are battery powered and are typically installed on existing street furniture or in roadside bollards. The broadcast range achieved from a Booster can vary from typically 500m to 25Km depending upon the variant selected.

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