2014 12 david hall
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Cardiff Bay - Environmental Management
and Implications for Recreational Use
David Hall
Cardiff Harbour Authority
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Post War Decline
• Major impact on South Cardiff
• Move to oil
• Containers and efficiency of larger ports
• Closure of East Moors steelworks
• High rates of unemployment
• Reduction in land values
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Regenerating Cardiff Bay
• Commenced in 80’s with move of County Hall
to Cardiff Bay
• Development Corporation set up in 1987 to
regenerate the 1,100 hectares of derelict
docklands
• £500m public sector investment 1987 to 2000
• Main Infrastructure projects were Cardiff
Barrage, Butetown Tunnel, PDR.
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CBDC Achievements
• The construction of the Cardiff Barrage
• 31,000 new jobs
• 6,000 new housing units
• 327 hectares of land reclamation
• 695,000 sq metres of commercial
developments
• £1.7billion private sector investment
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CBDC Achievements
• The construction of the Cardiff Barrage
• 31,000 new jobs
• 6,000 new housing units
• 327 ha of land reclamation
• 695,000m2 of commercial developments
• £1.7billion private sector investment
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Pre Barrage Concerns
• Debris management
• Flood defence
• Migratory fish
• Dissolved oxygen levels
• Water quality
• Algae
• Birds
• Pests (rodents and chironomids)
• Groundwater levels
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Pre Barrage Concerns
• Debris management
• Flood defence
• Migratory fish
• Dissolved oxygen levels
• Water quality
• Algae
• Birds
• Pests (rodents and chironomids)
• Groundwater levels
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The Ely & Taff catchments
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Debris Management
• > 95% of debris originates from outside Harbour
Authority jurisdiction
• Prior to Barrage, debris eventually washed out into
Severn Estuary
• Debris now contained within Bay
• Two pronged attack – land and water
• In 2013-14, 600 tonnes of debris removed from the Bay
• Of this, 50 tonnes of wood were segregated for fuel use
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Cardiff Bay Barrage Act 1993
– Cl. 8 (1)(a) – protect the quality of the water
in the inland bay by ensuring that it meets or
continues to meet the relevant standard
– Cl. 8(2) – quality of water meets this
standard if it contains not less than 5mg/l
dissolved oxygen at all times
Dissolved oxygen levels
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Sewage pumping station discharge
Non-compliance due to sewage
discharge
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Aeration system cross section
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Graph – benefit of aeration system
C o mpariso n between to p and bo tto m disso lved o xygen (8 metres depth)
5
7
9
11
13
15
23-Jun 24-Jun 25-Jun 26-Jun 27-Jun 28-Jun 29-Jun 30-Jun 1-Jul
D.O
. (m
g/L
)
1m from surface 1m from bottom
Large gradient develops
Aeration ON
Oxygen gradient reduces
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Oxygenation Barge
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Water Quality
• All activities are based on a Risk Assessment approach
• Decisions based on a predictive model
• Health monitoring is carried our for all participants
• Every case of illness followed up and investigated
• Process in place was developed in conjunction with
Public Health Wales
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Water Quality Model
Classification
Faecal
coliforms
(per 100ml)
Streptococci
(per 100ml)
EC Bathing
Waters
classification
EXCELLENT
<100
<100
Guideline
GOOD
100 to 2000
N/A
Imperative
POOR
>2000
>100
Fail
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Water Quality
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Use of Water Quality Model
• Run model on daily basis
• Provide information to public to facilitate
informed choice
• Provide an input into management of water
sports centres
• Facilitate day to day programming of activities at
water sports centre
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Use of Water Quality Model
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Algae
• Monitored weekly in the autumn and winter
• Monitored twice weekly in spring and summer
• Samples analysed using algal analysers (both lab
based and algal torch)
• Alert Level Framework in place in the event of Blue
Green algal blooms
• No significant blooms within Cardiff Bay since
impoundment
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Algal scums
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Pests
• Chironomids
• Rodents
• Invasive species
• Zebra Mussels
• Killer shrimp
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Pests
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Water based events • Home Nations Rowing Regatta
• European Water Ski Championships
• Formula 3 and Formula 500 Powerboat World
Championships
• ICF Canoe Slalom World Cup
• RYA National Powerboat Championships
• Extreme Sailing Series
• Triathlons
• Volvo Ocean Race (2017)
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Cardiff International White Water
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