4 juni 2014

1

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 auteur.Roelof.stuurman@deltares.nl

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.,

1 januari 2008

1 januari 2008

4 juni 2014

2

1 januari 2008

Surface elevation

1 januari 2008

4 juni 2014

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

4 juni 2014

Groundwater - Surface water interaction aroundFilmore, section parallel to the Lake

4 juni 2014

4 juni 2014

3

Building damage

Broken storm drainage and sewer pipes andRoad damage

4 juni 2014

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

4 juni 2014

4

4 juni 2014

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

1 januari 2008

Salinization of wetlands

1 januari 2008

Salinization ofgroundwater

1 januari 2008

Earthquakes

1 januari 2008

Damaged wooden and concrete foundation

Negatieve kleef

4 juni 2014

5

4 juni 2014

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

4 juni 2014

6

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

1 januari 2008

?

?

4 juni 2014

7

4 juni 2014

Temporally groundwater pumping

Temporally groundwater pumping is creatingsubsidence

4 juni 2014

4 juni 2014

4 juni 2014

Predicting subsidence in New Orleans

4 juni 2014

4 juni 2014

8

1 januari 2008

4 juni 2014

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.

4 juni 2014

2.Delibirate artificial acceleration ofsubsidence process

4 juni 2014

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

4 juni 2014

Agriculture: groundwater table low

Restored nature: groundwater table high

peat

CH4 / N2O

CO2

CH4

Increase ground water level

4. (Ground-)water management

4 juni 2014

9

1 januari 2008

4 juni 2014

4 juni 2014

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

4 juni 2014

10

4 juni 2014

“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

4 juni 2014

11

You cannot manage what you don't now:Implement monitoring network

4 juni 2014

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”

4 juni 2014

Start pilot projects:“every drop matters”

1 januari 2008

Subsidence by groundwater pumping?

4 juni 2014

12

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

4 juni 2014

DANK VOORUW GEDULD!