iabr 2 roelof stuurman
TRANSCRIPT
4 juni 2014
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Soft Soils need Solid Urban Planning
Urban groundwater drainage and subsidence:comparing Louisiana and The Netherlands.Water management as a key in subsidencecontrol
Roelof Stuurman (Deltares), 4 Juni 2014
Informatie of beeld uit deze presentatiemag alleen worden overgenomen natoestemming van de [email protected]
4 juni 2014
Rebuilding, considering water andsubsoil
4 juni 2014
“NOBODY IS COMPLAINING ABOUTGROUNDWATER”
“…..THEY ARE COMPLAINING ABOUTSUBSIDENCE!”
New Orleans Sewerage & Water Board GeneralSuperintendent Joseph C. Becker, P.E.,
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Surface elevation
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Subsidence components
??
~ 0.034 mm/yr
~0.15 mm/yr
~0.45 mm/yr
Courtesy Tulane University, New Orleans
~ 1.6 mm/yr
??
Total subsidence in NO = ~6mm/yr
Schade door maaivelddaling
1 januari 2008
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Groundwater - Surface water interaction aroundFilmore, section parallel to the Lake
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Building damage
Broken storm drainage and sewer pipes andRoad damage
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1 januari 2008
Rain water flooding
1 januari 2008
Broken drinking water distribution system
Gas pipeline rupture sparks major blast outside New Orleans
Differential subsidence of marshland peat as ageologic hazard in the greater New Orleans area
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Stability of levee embankments,And subsidence levee system
1 januari 2008
Wetter soil conditions,increasing groundwater related flooding
SUBSIDENCE
Functions: roads 70 cm,buildings 40-100 mgardens, parks 50 cm
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Salinization of wetlands
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Salinization ofgroundwater
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Earthquakes
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Damaged wooden and concrete foundation
Negatieve kleef
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Lower groundwater levels: subsidence anda better life for termites
4 juni 2014
Getsewoud (opbarsting)Increasing risk for sand boils, bursting clay layers
1 januari 2008
1 januari 2008
The first high frequency groundwater monitoring well inthe garden of Waggonner & Ball, Prytania street
High frequency groundwater monitoring
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1 januari 2008
Audubon Park: an example of undesired interactionsbetween water components
1 januari 2008
RegionalGroundwater flow
URBAN GROUNDWATER.qWho takes responsibility?q Deep groundwater is still over
exploited (energy plant Orleans NE)qWhat's impact on subsidenceqManaging shallow groundwater is
needed for subsidence andsalinization control?
q Shallow groundwater is mainlycontrolled by surface water anddraining pipes.
Every deep groundwater drop, in and around NewOrleans, flows to the power plant in NO NE
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?
?
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Temporally groundwater pumping
Temporally groundwater pumping is creatingsubsidence
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Predicting subsidence in New Orleans
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1. Urban planning process1. Urban spatial planning
04/06/2014
Improve existing quick scan maps.Use soil and subsidence map by asset managementsewer pipes, drainage pipes, gas pipes and drinking
water pipes.
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2.Delibirate artificial acceleration ofsubsidence process
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EPS (polystyreen)
15-40 kg/m3
Maintenance 25% cheaper
Vulcanic “bims”
700 kg/m3 (sand/gravel= 1500 kg/m3)
Shells, 800-900 kg/m3
3. Use lighter building materials
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Agriculture: groundwater table low
Restored nature: groundwater table high
peat
CH4 / N2O
CO2
CH4
Increase ground water level
4. (Ground-)water management
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Canal Street Test executed in collaboration withJefferson Parish: Surface water level was raised in a fewhours (4 feet). Groundwater reacted nearly immediatelyand raised 2 feet. The flooded storm water drains lostwater into the underground.
A headache every now and then …
1 januari 2008
1 januari 2008
qWho takes responsibility?qDeep groundwater is still over
exploited (energy plant Orleans NE)qManaging shallow groundwater is
needed for subsidence andsalinization control?qShallow groundwater is mainly
controlled by surface water anddraining pipes.
5. Urban groundwater governance
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“What you are doing, isdemystifying groundwater”
Joe Madiath (NGO Gram Vikas, India)
1 januari 2008
Audubon Park: an example of undesired interactionsbetween water components
6. Floating constructions
1 januari 2008
Audubon Park: an example of undesired interactionsbetween water components
7. Flexible constructions
1 januari 2008
Audubon Park: an example of undesired interactionsbetween water components8. Asset management
,
04/06/2014
Piped infrastructure management (sewer, drainage,gas, drinking water): “Ruling by forecasting”
City of Rotterdam
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You cannot manage what you don't now:Implement monitoring network
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Extensometer in Jakarta
Extensometer at old Geology Office Jalan Tongkol
41 cm
4,5 cm
3 cm
1997
Raise groundwater & subsidence awareness:“start with the children”
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Start pilot projects:“every drop matters”
1 januari 2008
Subsidence by groundwater pumping?
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voorbeeld Rijnenburg
1 januari 2008
AHN
1 januari 2008
Ontwerp met ondergrond
• Verhoog de waterstand,• Verbreed geulafzettingen met zand van te graven waterplas;• Steigers met drijvende woningen;• Korte termijn duurder
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DANK VOORUW GEDULD!