2006 Regional Flood Warning 
Phase V

Project undertaken on behalf of the Environment Agency – Thames Region in conjunction with Mowlem PLC and Halcrow Group Ltd  which comprised the Supply, Construction, Installation and Commissioning of 23  River Level Monitoring Stations with Submersible Transmitters, 3 x Tipping Bucket Rain Gauge Stations

Level Monotoring Stations were located in the 3 operational areas as below:-

North East 8 locations NE22 to NE29

South East 6 locations SE21 to SE26

West Area 9 locations W18 to W26

West Area 3 locations RGW5 to RGW7

Pre-fabricated GRP Stilling Well sumps were utilised with 300mm Twinwall Risers to ground level with a pre-cast slab complete with Dipping Porthole and EA Benchmark.
Where GRP sumps were impractical or alternative means of mounting tubes were available galvanised tubes were utilised secured to the walls of the structures.

Similarly Gaugeboards were either of the driven T Iron types or wall mounting.

Rain Gauges were constructed to a standard drawing comprising an ELE

Tipping Bucket Rain Gauge and Stainless Steel Octapent Monthly Check Gauge

Environmental Agency Project with Halcyon Solutions

North East 8 locations NE22 to NE29

NE22 Town Bridge  – River Chess, Chesham

Station located adjacent to Town Bridge to monitor part of the  River Chess during high level events.The station was constructed at roadside with a black pigmented kiosk with the stilling well immediately underneath.

River Chess, Chesham


Chesham Town Council


Stilling Well cover in centre of base



NE23 Laurel Way - Dollis Brook, Whetstone

Kiosk mounted on a riser to ensure internal shelf is above the 1:100 Flood level

Dollis Brook Whetstone


Stilling Tube mounted on bank wall with access T on the top and adjacent dipping plate


NE24 Dane End-River Beane

Earth Pit constructed alongside kisk

Dane End River Beane


Stilling Tube mounted on driveway bridge with Junction box with SWA cable to Kiosk. Small trash screen to stop intruders into the owners garden!


NE25 Arnos Park – Pymmes Brook, New Southgate

Confluence of Bounds Green Brook with Pymmes Brook in concrete urban channels

Arnos Park


“Upstream stilling tube  – Pymmes Brook

Pymmes Brook


“Downstream Stilling Tube after confluence


Kiosk adjacent to Arnos Park fence


NE26 Rosedale Way – Rags Brook, Flamstead End

Rosendale Way





NE27 Small River Lee – Cheshunt

Construction in progess, Base with Apron, Stilling Well and Gaugeboard

Small RiverLee in Cheshunt



NE28 Trinity Lane – Theobalds Brook, Waltham Cross

Trinity Lane, Theobalds Brook, Waltham Cross




NE29 Chesham Close -River Rom, Romford

Kiosk mounted on top of culvert

Chesham Close, River Rom, Romford



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