will it all come out in the wash?!: eel passage at hobhole ... · eel passage at hobhole pumping...
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Will it all come out in The Wash?!:
Eel passage at Hobhole Pumping Stations
Martin Redding [email protected] (Assistant Engineering Manager & Environment Officer)
Witham Fourth District Internal Drainage Board. 47 Norfolk Street, Boston, Lincolnshire. PE21 6PP
Hobhole Pumping Station outfall overview 2014
The Fens
c.350,000 Ha Below +5m ODN Lots of IDBs Covers parts of 4 of
the 8 Association of Drainage Authorities (ADA) Branches
Complex! Difficult to define!
Witham Fourth District IDB waterways
Boston
c.41,000 Ha
147km of drain
561km of dyke
– IDB boundary
– Main drains (lowland system)
– Smaller watercourses (lowland system)
– EA watercourses (highland system with raised banks)
– catchment
147km of drain and navigation
561km of dyke
© OS Licence No: 1000017553
c.50,505 ha
Hobhole PS
Hobhole diesel & electric Pumping Station outfalls winter 2012
Hobhole diesel pump chambers & gravity sluice arrangement
Hobhole diesel Pumping Station
Hobhole impeller, left, St. Germans new Bosman KSB
pump & impeller 2010, right.
Hobhole diesel station & impeller & volute pump chamber
Hobhole diesel station impeller
Hobhole Pumping Station outfall low & high tide Sep 11 2014
Hobhole Pumping Station gravity sluice outfall replacement 2014
Lower Hobhole Drain Fish Density (EA data)
Hobhole Pumping Station vital statistics:
Optimum flow 9.43 cumecs (9,430 litres per second or 9.43 tonnes per second) per pump
Max head 8.5m Optimum operation @
100-107rpm Total capacity with all 3
diesel & 4 electric pumps running 36.7 cumecs
impeller on diesel pump 2.23m diameter & 3 vane with a 3/1 gear box
How big is it?...
Hobhole diesel station cross section – as built
Hobhole diesel station cross section – pump well
Hobhole diesel station & deaf blind centre…
Hobhole Diesel Pump Chambers & Gravity Sluice Arrangement
Hobhole Electric Pumping Station Plan
Note: the former ghost outline of the gravity sluice abuttments
Hobhole Electric Pumping Station Cross section
Electric Station installation late 1980’s. *Note: Grade II listed sluice which was redundant then
Electric Station installation late 1980’s
Hobhole – The Haven Nature Designations
De-silting Lower Hobhole Drain over winter in 2012
Hobhole Pumping Station eel & fish monitoring Autumn 2014
Electronic tagging of eel
Sonar
Home Office licence
Fish & eel friendly pumps?
Catching eel & fish in the outfall
EA & Hull Institute of Fisheries (HIFI)
Catch some eel: Terry Smith & his son catch eel sustainably to support their thriving family business - stage 1
http://www.smithssmokery.co.uk/
Eel successfully caught in Witham Fourth IDB catchment - stage 1
2014
Passive Integrated Transponder (PIT) Tag use at Hobhole - stage 2
Environment Agency fisheries staff & academics & post graduate students from Hull Institute of Fisheries (HIFI) monitoring
Passive Integrated Transponder (PIT) Tag use at Hobhole - stage 3
Suitable eel are anaesthetised, given a health check & tags are inserted following careful & swift surgery under licence from the Royal College of
Veterinary Surgeons & Home Office
Passive Integrated Transponder (PIT) Tag & Adaptive Resolution Imaging Sonar (ARIS) use at Hobhole - stage 4
Fyke net deployed in outfall while running a single diesel pump
Adaptive Resolution Imaging Sonar (ARIS) at Hobhole- stage 5
What has gone through the single diesel pump?
People are important & the right one’s!
People are important & the right one’s!
People are important & the right one’s!
Typical debris following a medium size rainfall event