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8/6/2019 EManda Presentation
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Water and Climate Change AdaptationWater and Climate Change Adaptation
in Asian River Basinsin Asian River Basins
11--5 December 2008, Selangor,5 December 2008, Selangor, MalaysiaMalaysia
The Case of the Laguna de Bay BasinThe Case of the Laguna de Bay Basin
Presentation by:Presentation by:
..
General ManagerGeneral Manager
aguna a e eve opmen u or yaguna a e eve opmen u or y
e v ews expresse n s paper presen a on are e v ews o e au or an o no necessar y re ec e v ews or po c es o e s an
Development Bank (ADB), or its Board of Governors, or the governments they represent. ADB does not guarantee the accuracy of the dataincluded in this paper and accepts no responsibility for any consequence of their use. Terminology used may not necessarily be consistent withADB official terms.
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of La una de Ba ’sof La una de Ba ’s
Shoreland AreasShoreland Areas
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Variations in water level during typhoon events…ariations in water level during typhoon events…
Due to the large surface area of the lake and its
shallow waters, it is possible to have a storm surge in Laguna Lake waters (e.g. periodic rise and fall of the water level created by the stormy wind, as in a typhoon event).
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Laguna de Bay as Flood D etentionaguna de B ay as Flood D etention
R iieservoireservoir
detention reservoir to 23 sub-basinscom risin five rovinces, includin MetroManila.
Durin flood time, the La una Lakebecomes the temporary storage of excessflood waters from Marikina River via
anga an oo way an ap n anChannel.
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Lake water level during summer months:Lake water level during summer months:
10.50 m elevation10.50 m elevation(annual average min.)(annual average min.)
10.50 m10.50 melevationelevation
12.50 m12.50 m
elevationelevation
Shoreland areaShoreland area
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Lake water level during rainy season:Lake water level during rainy season:
12.50 m elevation12.50 m elevation
10.50 m10.50 melevationelevation
12.50 m12.50 m
elevationelevation Shoreland areaShoreland area
Lake water levels fluctuations:Lake water levels fluctuations:
Rainy seasons: 12.50 m elevation
Annual mean: 11.32 m elevation
g est eve recor e : 14.60 m year 1919Lowest Level recorded: 10.27 m (year 1969)
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Population Pressure in Lake
hore AreasLar e shore land areas to the western, southern andeastern parts of the lake remain vulnerable to flooding.
A very long strip of shoreline of about half the lakeperimeter requires protection from flood waters.
.
of basin population
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Population Pressure in Lake ShorePopulation Pressure in Lake Shore
AreasAreasFlooding will always recur during the wet season. Theduration of floodin of these areas ma be tem orarbut can range from few days to several weeks
depending on the period and duration of the southwestmonsoon rains that accompany the storm. Hence,
place.
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Marikina
River Built in 1986, the
nine kilometer channel,with an average width of
Pasig River
,2,400 m3 /s flow at 100
year flood.
Mangahan Floodway
Napindan
Flood control operation
under the Effective anne Flood Control and Operation System (EFCOS) of Metro
Laguna de Bay Laguna de Bay an a eve opmenAuthority (MMDA).
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As one of the major
the lake, Mangahan
Floodway is affected by thelake water stage.
Design high water level is
at 14.00 m at the mouth ofthe floodwa with 1.0 mfree board to the top of theembankment.
260 m
condition, propagatingwave from the lake cancost lives and destruction
220 m
Aerial view of Mangahan Floodway showing the settlers on its side slopes Aerial view of Mangahan Floodway showing the settlers on its side slopes
to the properties on thebank dwellers.
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Main Issues on Water andMain Issues on Water and
Climate Change AdaptationClimate Change Adaptation Densely populated lakeshore communities highly vulnerable to
oo ng e ects – mpacts t e poor sproport onate y
Present economic and olitical situation in the Phili ines/lakebasin deters relocation of the exploding bank and shore settlersto safer places
Current adaptation measures mostly reactive & focused onevacuation and disaster relief operations, not on sustainable
strategies; primarily implemented by the Nationaleg ona oca sas er oor na ng ounc s w ,MMDA, and LGUs
Top-down approach - Communities at risk not directly involvedin the planning & execution of adaptation measures (result:unaware of the risks)
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Main Issues on Water andMain Issues on Water and
Climate Change AdaptationClimate Change Adaptation,,
need to adapt to full range of factorsneed to adapt to full range of factors
Adaptation is resourceAdaptation is resource--intensive: priorityintensive: priority – –
extreme events or on more pressing waterextreme events or on more pressing water
, . .,, . .,
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nn-- in /Pl nn W r nin /Pl nn W r nClimate Change AdaptationClimate Change Adaptation
’’Laguna de Bay Institutional Strengthening &Laguna de Bay Institutional Strengthening &
Communit Partici ation LISCOP Pro ectCommunit Partici ation LISCOP Pro ect
(World Bank/Netherlands Funded)(World Bank/Netherlands Funded)
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an er nv ronmen a ro ec s
Morong IntegratedSWAngonoMRF/Composting
Silang MRF/Composting
Tanay MRF/Composting
TTeresa MRF/Composting
ANGONOTERESA
TANAY
Siniloan Reforestation
Mabitac
CARDONA
SINILOAN
MORONG
SAN PEDRO
MUNTINLUPA
Kalayaan Integrated
SWM (Landfill)
MRF/Composting
NAGCARLAN
LILIW
STA.CRUZ
MAJAYJAY
KALAYAAN
CAVINTI
AGM
LOS BAÑOS
SILANGSta. Rosa Biogas Nagcarlan
MRF/Composting
ALAMINOS
LUCBAN
Victoria , Pakil,Pangil
Sta. Cruz SWMCabuyao FloodControl
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SmallSmall--Scale CDM ProjectsScale CDM Projects
vo ance o me aneproduction from biomass
Production Area
Windrows/ toxic & hazardous areaBricks from wastes
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Kalayaan Integrated Solid Waste Management
May
leachate pond
First of its kind Category I Sanitary Landfill pavement that started
fromthe northern portion of the site
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Decentralized Waste Water Treatment System
Sta. Cruz, Laguna
Anaerobic Baffle Reactor (ABR)
Biogas digester
Anaerobic Filter (AF)
Planted Gravel Filter (PGF)
from Wastewater
Treatment
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Pangil Environmental Enhancement
Sub-Project
Cabuyao Flood Control Sub-Project
:
CDM Reforestation/Afforestation forCarbon Sequestration
R l f LLDA i W dR l f LLDA i W d
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Role of LLDA in Water andRole of LLDA in Water and
in the Lake Basinin the Lake Basin
Minimize water use conflictsMinimize water use conflicts
Improve lake basin planning that is watershedImprove lake basin planning that is watershed--focused, hi hl artici ative & demandfocused, hi hl artici ative & demand--driven,driven,and integrates water & climate changeand integrates water & climate changeadaptation into sustainable development &adaptation into sustainable development &
Science & technologyScience & technology--based decision supportbased decision supports stems stem
Disaster risk reduction management (proposed)Disaster risk reduction management (proposed)in pilot vulnerable subin pilot vulnerable sub--basin (Siniloan)basin (Siniloan)
S E i f R i lS E i f R i l
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Some Expectations from RegionalSome Expectations from Regional
NetworkNetwork Climate chan e ro ectionsClimate chan e ro ections
Study on vulnerability of the Laguna de Bay Basin toStudy on vulnerability of the Laguna de Bay Basin towater and climate change effects, e.g., floods,water and climate change effects, e.g., floods,
, ., .
Impact assessments, e.g.,Impact assessments, e.g., Reduction of surface water due to climate chan eReduction of surface water due to climate chan e
Climate change impact on water qualityClimate change impact on water quality
Land loss due to surface runLand loss due to surface run--offoff
Adaptation strategiesAdaptation strategies Reducing land degradation and promotingReducing land degradation and promoting
Improving governance mechanisms at all levelsImproving governance mechanisms at all levels
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Proposed Collaboration withProposed Collaboration with
NAHRIMNAHRIM Ex andin the ca abilities & a lications of existinEx andin the ca abilities & a lications of existin
LLDA’s Decision Support System to include projectionsLLDA’s Decision Support System to include projections
& assessment of water& assessment of water--related disaster events & climaterelated disaster events & climatechan e; simulations of ada tation measureschan e; simulations of ada tation measures
Increasing capacity of LLDA as a RBO to adapt to/ Increasing capacity of LLDA as a RBO to adapt to/
manage watermanage water--related disaster risksrelated disaster risks ,,identify , develop & package priority investments in water &identify , develop & package priority investments in water &climate change adaptation for the lake basinclimate change adaptation for the lake basin
KnowledgeKnowledge--based education & advocacy to build a culture ofbased education & advocacy to build a culture ofsafety & preparedness among communities at risk, andsafety & preparedness among communities at risk, andgovernment at all levelsgovernment at all levels
Institutionalized waterInstitutionalized water--related disaster risk management amongrelated disaster risk management among
ey p ayers, nc u ng , n e a e as n con exey p ayers, nc u ng , n e a e as n con ex Exchange of knowledge and scientific informationExchange of knowledge and scientific information
Access to funding facilitiesAccess to funding facilities
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Th nk Y Th nk Y
Laguna Lake Development AuthorityLaguna Lake Development Authority
Email: ogm@llda.gov.phEmail: ogm@llda.gov.ph
e e ax o.e e ax o. -- --
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Reserved slidesReserved slides– –
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Comparison of Land Cover
pr pr
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Comparison of Lake Sedimentation
1993 2000
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