Management of Surface Water in Severe Weather Conditions from the Highway GORDON HUNT COUNTY...
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Transcript of Management of Surface Water in Severe Weather Conditions from the Highway GORDON HUNT COUNTY...
Management of Surface Water in Severe Weather Conditions
from the Highway
GORDON HUNT
COUNTY DRAINAGE ENGINEER
for
OXFORDSHIRE COUNTY COUNCIL
Can the Existing Systems Cope
• In the intense storms we are experiencing
• NO
• The old drainage systems can not cope
Problems we are experiencing due to the intense storms
• Blocked Gullies
• Silted pipes
• Silted soak away’s
• Blocked bore holes
• Overgrown and blocked ditches
• These are expensive to maintain
• So they don’t get done regulary
What can Oxfordshire do about it
• Find more money – Where ?
• Encourage – self help
• Residents to rake leaves off gullies outside their propertys
• Encourage local Flood Groups – to check,:-
• local problems, walk ditches, identify problems early
• Give support to these Groups
What can the Highway Authority do to help
• Think outside to box!!
• Change the type of drainage we are installing
• Design systems that are cheap to maintain
• Or require minimum maintenance
• Be creative
Porous Pavements - is one way
• All new estate roads, but not on Bus Routes
• It stores water in storms – reducing flows down stream
• Have chambers built into water storage so Contractors can pump water up to maintain Developments Planting Scheme in drought conditions
Severe Weather
• Yes – severe weather can mean drought conditions as well
• We need water to water all the trees and plants that are planted every year on road schemes, developments, schools etc.
Swales and Grips• Over the edge drainage – cheap to maintain• Grips with kerb droppers – safe and cheap• Wide swales – so cars can drive through them –
safe• Have filter drains under the grass – linking
swales • Construct check damns to slow the water flows
down• Swales hold more water than pipes
Ponds
• Good water storage
• Looks good on developments
• Flat side slopes – safe
• No fencing or hard concrete headwalls
• Use natural materials
• Vegetation grows quick – no need to plant
• Cheaper to maintain than Box Culverts