climate change water climate change, water resources ... change, water...• 2000 ‐heaviest...
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Climate Change Water Climate Change, Water Resources and Adaptationp
Climate Change Policies in the Arab Middle EastClimate Change Policies in the Arab Middle East Challenges for Decision Makers and Activists
A Regional Conference21‐22 October 2008Amman ‐ Jordan
Dr Amjad AliewiHouse of Water and Environment
Ramallah, Palestine1
What is Climate Change?What is Climate Change?
• Climate change is the change in the magnitude of a• Climate change is the change in the magnitude of a single climate parameter such as temperature.
• Is it really confirmed that some areas are shifting to colder, wetter, cloudier, and windier conditions and other areas shift to the opposite direction?!!
2
Parameters of Climate ChangeParameters of Climate Change
Climate Changesg
Temperature
Precipitation
Sea Level Rise
3
Variation of the Earth’s Surface Temperature for the Past 140 yearsfor the Past 140 years
Global mean surface temperatures have increased
4
Sea Levels have Risen
5
Pathways of Climate Change Impacts
6
Climate Change: a threat for water resources in our region
Lower rainfall.
Increase in the intensity and distribution of precipitationIncrease in the intensity and distribution of precipitation.
An increase of floods.
A rise of temperature.
It will add pressure on ‐ water resources‐ water resources.‐ environment resources
‐ ‐ coastal system
7
y
Climate Change: a threat for water resources in our region
Temp warmining will lead to more demand on water.
Evaporation will increase and this will reduce the availableEvaporation will increase and this will reduce the available water supply.
Water quality will deteriorate due to high concentration of agriculture chemicals in lower flows.
Intensification of rainfall will be responsible for soil erosion, leaching of agriculture chemicals and runoff of urban wastesleaching of agriculture chemicals and runoff of urban wastes and nutrients into water bodies.
8
Potential Climate Change Impacts on Water Resourceson Water Resources
• Change in average precipitation• Change in average precipitation
• Change in the character of precipitation (rainfall intensity)
• Changes in amount, timing and distribution of floods and droughts
• With a warmer land and atmosphere:• More precipitation falls as rainp p• Winter runoff is increased• Winter starts later (or earlier?) and ends earlier (or later?)S i ff l i li ( l t )• Spring runoff pulse is earlier (or later)
• Summer runoff (if any) is decreased
9
Extreme EventsExtreme Events
• 1991/2 ‐ Wettest year recorded over the century, with annual mean precipitationabove 200% in most areas.
• Water levels in aquifers returned to the levels of 1950’s in many places.
• 1995, 1998 ‐ While most spring and fall khamasin events (hot, dry cyclone) occurin May‐June and in September‐October, respectively, the first ever recordedkhamasin as late as July (accompanied by a severe forest fire in the West Banky ( p ymountains) and as early as April in 1998 (causing severe agricultural damage)occurred in 1995 and 1998, respectively.
10
• 1998 ‐ Hottest summer recorded.
• 1999 – First khamasin ever recorded in December, accompanied by severe forest fires on Mt. Carmel.
• 1998/9 and 1999/2000 ‐ two consecutive years of extreme drought and the longest drought ever recorded in the south (leading to widespread mortality of trees ).)
• 2000 ‐ Heaviest snowfall in the northern Negev.
• 2000 ‐ Hottest July in the last 50 years, with a mean temperature 4oC higher than average. Highest recorded temperature (41oC) in Jerusalem since 1888.
11
Potential Climate Change Impacts on Water Resourceson Water Resources
• Surface water
• Groundwater
• Availability of water supplies
12
Potential Climate Change Impacts on Water Resourceson Water Resources
• Drinking and agricultural waters (less rainfall)
• Coastal property and infrastructure (sea
level rise)level rise)
• Economic activity
13
Precipitation Intensity Increases
• More intense precipitation
• Precipitation increases are due to the strong events• Precipitation increases are due to the strong events
14
Rainfall of Nablus City – Annual amount
15
Rainfall of Nablus City – Number of Rainy Days
16
Minimum and Maximum Numbers of Rainy Daysof Rainy Days
The minimum and maximum numbers of rainy days per year for the past 30 years are 23 and 46 days, respectively with
f dan average of 39 days per year.
It can be inferred that the rainfall amount per a rainyIt can be inferred that the rainfall amount per a rainy day is increasing while the frequency of rainy days is decreasing.g
17
Distribution of drought, dry, normal d and wet years
18
Surface runoff and flush floods Surface runoff and flush floods
Increased risk of floods due to sea level rise and heavy rainfall events
• The vegetation in the semi‐arid and arid parts of Palestine significantlyreduces the permeability of the underlying soil.p y y g
• The projected reduced precipitation processes, will expand the dryness ofh lthe top soil.
• In addition to the 2 points above the projected increased rain intensityIn addition to the 2 points above, the projected increased rain intensity,the surface runoff will increase.
Thus, climate‐change induced increased surface runoff will exacerbatedesertification.
19
Surface runoff and flush floods Surface runoff and flush floods
• The increased rainfall intensity will also increase surfacerunoff from urban areas.
• This, together with the increased runoff from open areas willgenerate more frequent and more powerful flash floods thatbeside damage to infrastructures and life will lead to anbeside damage to infrastructures and life will lead to anincreased water loss, either to the Mediterranean or to theDead Sea.Dead Sea.
20
Surface runoff and flush floods Surface runoff and flush floods
• The increased runoff, coupled with sea level rise andincreased rain intensity may cause flooding leading to thecreation of swampscreation of swamps.
• A decrease in the hydraulic slope between drainage systems• A decrease in the hydraulic slope between drainage systemsand sea level reduces the efficiency of water transfer andincreases the probability of flooding. This may result in ap y g yrelatively high vulnerability to projected increases in rainintensity and surface runoff.
21
Impact of Climate Change on Water Availability
O thi d f• One third of
the world’s population is nowpopulation is now subject to water scarcity
• Climate change is projected toprojected to decrease water availability in many arid‐ and semi‐arid regions
22
Impact of Climate Change on Water Availability
• In Palestine 40 % of the communities do not have access to water supply
• This translates to 35% of the population
• 67% of the Palestinians do not have safe sanitation
23
Climate Change: Impact on RechargeClimate Change: Impact on Recharge
• The variations in the amount of precipitation, the timing of precipitation events, and the form of precipitation are all key factors in determining the amount and timing of recharge to aquifersaquifers.
• Droughts result in declining water levels not only because ofDroughts result in declining water levels not only because of reduction in rainfall, but also due to increased evaporation and a reduction in infiltration that may accompany the development of dry top soils.
• Extreme precipitation events (e g heavy rainfall and storms)• Extreme precipitation events (e.g., heavy rainfall and storms) may lead to less recharge to groundwater because much of the
precipitation is lost as runoff.
25
p p
Climate Change Impact on Groundwater FlowClimate Change Impact on Groundwater Flow
Climate variability and change may be important considerations for overall changes to the groundwater flow.
Coastal aquifers are sensitive to changes in water budget due to the interaction between fresh and saltbudget due to the interaction between fresh and salt water in the subsurface along the coast.
When recharge is lowered, the position of the freshwater‐saltwater interface will move inland.
Similarly, a rise in sea level that might accompany climate change will move this interface inland.
26
g
Climate Change Impact on FlowClimate Change Impact on Flow
27
Climate Change Impact on GW StorageClimate Change Impact on GW Storage
Less recharge will mean less storage of groundwater in an aquifer.
When groundwater is removedfrom storage of aquiferfrom storage of aquifer with less recharge, water levels in the aquifer will drop in multiple q p porders.
28
Impact of less recharge Impact of less recharge
A long‐term decline in groundwater storageA long‐term decline in groundwater storage.
Increased frequency and severity of groundwater q y y gdroughts.
Hi h i f llHigher concentration of pollutants.
Saline intrusion in coastal aquifersSaline intrusion in coastal aquifers, due to sea level rise and drop inwater levels.
29
Climate Change in Palestine: Some results f h SUSMAQ P jfrom the SUSMAQ Project
Variability of rainfall is crucial for recharge
• spatial: topography, permeability of surface
• temporal: intensity, seasonality
Major concerns for future recharge:
• climate change: global warming
• observed downward trend in annual rainfall
30
Background – observed trends (1961-90)Background observed trends (1961 90)
DecreasingDecreasing
IncreasingIncreasing
31
Background – global warmingBackground global warming
C di i fCurrent predictions are for:• decreases in annual rainfall by the 2050s • increase in temperatures, causing higher losses from evaporation
• changes in snow accumulation and melt
A possible further issue is the effect of variationsin rainfall intensity on groundwater recharge. y g g
32
Available rainfall dataAvailable rainfall data
Daily stationsDaily stations 7878
Monthly stationsMonthly stations 110110
Annual stationsAnnual stations 110110
33
Available DataAvailable Data
• Annual, monthly and daily stations
#
#
#
#
#
#
##
##
# ##
# # ###
# ###
#
D2
D11
D13
D18
D19D20
D21D22
D23D24
D25 D26D27
D28 D29 D30
D31D32
D33D34
D77M21
M22N60000 80000 100000 120000 140000 160000 180000 200000 220000 240000
200000 200000
220000 220000
#
#
#
# ##
#
#
#
####
# ## #
##
##
#
#
#
#
## #
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D3
D4
M6
D14
D34D35 D36D37
D39D41
D42
D43D44D45
D46
D47 D48D49 D50
D51D52
D53 D54D55
D56 D57
D58
D59D60 D61
D69M13
M20
M21
M29
M30
160000 160000
180000 180000
#
#
# ##
####
#
#
#
#
#
#
#
#
#
#
##
D5
M1
D17
D61D62
D64D65D66
D67
D68
D70
D71D72
D73
D78
M19
M23
M26
M27
M28 M32
120000 120000
140000 140000
#
#
##
#
#
#
#
#
#
M3
D73
D74D75
D76
M10
M24
M25
M31
60000 80000 100000 120000 140000 160000 180000 200000 220000 240000
80000 80000
100000 100000
34
60 0 60 120 Kilometers
Available DataAvailable Data
• Annual average rainfall – fitted surface for the period 61‐90
Border line40000 60000 80000 100000 120000 140000 160000 180000 200000
Fitted (61-90)50 - 100100 - 150150 - 200200 - 250250 - 300300 350
N
000 180
2000
00
200000
300 - 350350 - 400400 - 450450 - 500500 - 550550 - 600600 - 650
1600
00
160000
180 000
600 650650 - 700700 - 750750 - 800800 - 850850 - 900900 - 95012
0000
120000
1400
00
140000
950 - 1000No Data
1000
00
100000
35
40 0 40 80 Kilometers40000 60000 80000 100000 120000 140000 160000 180000 200000
Available DataAvailable Data
• Location of the daily rainfall stations adopted for the spatial correlation analysis
36
Available DataAvailable Data
l f d l f ll l d d f h l d f ll• Correlation of daily rainfall plotted against distance for the selected rainfall stations in the WB. (A comparison with the Portuguese case)
y = 0.836e-0.0077xR2 = 0 740 8
1.0
on .
R = 0.74
0.6
0.8
Cor
rela
tio
0.4
Pear
son
0.20 20 40 60 80 100 120
37
Distance (km)
Trends in annual rainfall Trends in annual rainfall
3 200
.Jordan (Ma'an)1.5
Jordan (Ma'an)
0
1
2
CD
M 100
150
al R
ainf
all (
mm
) .
0.0
0.5
1.0
DEV
-2
-1
1961 1966 1971 1976 1981 19860
50
Ann
ua
-1.0
-0.5
1961 1966 1971 1976 1981 1986
1
2
1200
1500
(mm
) .
Jerusalem
0.5
1.0Jerusalem
-1
0
CD
M
300
600
900A
nnua
l Rai
nfal
l
-0.5
0.0DEV
-21961 1966 1971 1976 1981 1986 1991 1996
0
A
-1.01961 1966 1971 1976 1981 1986 1991 1996
38
Trends in annual rainfall Trends in annual rainfall
1
2 600
m) .
Tammun Primary School1.0
1.5Tammun Primary School
1
0
1
CD
M
200
400
nual
Rai
nfal
l (m
m
0.0
0.5
DEV
-2
-1
1961 1966 1971 1976 1981 19860
Ann
-1.0
-0.5
1961 1966 1971 1976 1981 1986
1
2
1200
1500
l (m
m) .
'Atarah
0.5
1.0'Atarah
-1
0
CD
M
300
600
900A
nnua
l Rai
nfal
l
-0.5
0.0DEV
-21961 1966 1971 1976 1981 1986 1991 1996
0
A
-1.01961 1966 1971 1976 1981 1986 1991 1996
39
Trends in annual rainfall Trends in annual rainfall
1
2
1200
1500
mm
) .
'Bait Dajan
0 5
1.0'Bait Dajan
-1
0
1
CD
M
600
900
nnua
l Rai
nfal
l (m
-0.5
0.0
0.5
DEV
-2
1
1961 1966 1971 1976 1981 19860
300 An
-1.0
0.5
1961 1966 1971 1976 1981 1986
0
1
2
1200
1500
(mm
) .
Dair Debwan1.0
1.5Dair Debwan
-3
-2
-1
0
CD
M
300
600
900A
nnua
l Rai
nfal
l (
-0.5
0.0
0.5
DEV
-4
-3
1961 1966 1971 1976 1981 19860
A
-1.01961 1966 1971 1976 1981 1986
40
Trends in annual rainfall Trends in annual rainfall
1
2
1200
1500
m) .
Ya'bad School
0 5
1.0Ya'bad School
1
0
1
CD
M
600
900
1200
nual
Rai
nfal
l (m
m
0 5
0.0
0.5
DEV
-2
-1
1961 1966 1971 1976 1981 19860
300 Ann
-1.0
-0.5
1961 1966 1971 1976 1981 1986
1
2
1200
1500
(mm
) .
Qaffeen Boys School1.0
1.5Qaffeen Boys School
-1
0
CD
M
300
600
900
Ann
ual R
ainf
all
-0.5
0.0
0.5
DEV
-21961 1966 1971 1976 1981 1986
0
A
-1.01961 1966 1971 1976 1981 1986
41
Cumulative departure from the mean (CDM) Cumulative departure from the mean (CDM)
2
1
M
JEENSAFUT SCHOOL
'AZZUN SCHOOL
DAIR ISTYAH
-1
0
CD
M DAIR ISTYAH
'AQRABAH SCHOOL
BIDYA SECONDARYSCHOOL
-21961 1966 1971 1976 1981 1986 2
'ATARAH
0
1
CD
MAL MAZRA'AH ALSHARQIYYAH SCHOOLSALFEET
QRAIT PRIMARYSCHOOL
-2
-1
QRAIT PRIMARY SCHOOL
DAIR GHASSANAH
42
21961 1966 1971 1976 1981 1986
Seasonal pattern of rainfall over the 3 decades Seasonal pattern of rainfall over the 3 decades
120
150
m)
NorthSouth
90
Ave
rage
(mm
61-70
30
60
Mon
thly
A 61-70 71-80
81-90
0
30
Oct ov ec an eb Mar Apr ay Oct ov ec an eb Mar Apr ay Oct ov ec an eb Mar Apr ayOct Nov Dec Jan Feb Mar AprMay Oct Nov Dec Jan Feb Mar AprMay Oct Nov Dec Jan Feb Mar AprMay
43
Monthly mean rainfall for the four recent decades
15061-7071-80
100
p (m
m)
81-9091-98
50sum
prp
0Sep Oct Nov Dec Jan Feb Mar Apr May
44
Proportion of wet days for the four recent decades
4061-7071-80
30
%)
81-9091-98
20
PW (%
0
10
0Sep Oct Nov Dec Jan Feb Mar Apr May
45
Mean Wet Day Average for the four recent decades
15
20
y)
61-7071-8081 90
10
15
mm
/wet
day 81-90
91-99
5
10
MW
DA
(m
0Sep Oct Nov Dec Jan Feb Mar Apr May
46
Proportion of days with rainfall greaterthan 10 mm
4061-7071-80
30
(%)
71 8081-9091-98
20
PW10
(
10
0Sep Oct Nov Dec Jan Feb Mar Apr May
47
Annual trend observed for the period of 61-90
40000 60000 80000 100000 120000 140000 160000 180000 200000#
#Y#Y
###Y#
#Y#Y#Y#Y#Y #Y#Y# #Y #Y
#Y#Y#Y # #####Y #Yر#Y
#Y AT 61-90# 20 3 5
Border lineN
00
18
2000
00
200000
#ر
#Y# ###Y#
# #Y#Y##Y#Y#Y#Y
ر
ر #Yر##Y
#Y
# -20 - -3.5# -3.5 - -2.5# -2.5 - -1.5# -1.5 - -0.5
0 5 0 5
1600
00
160000
1800
0000
Y#ر #Y#Y
ر
ر ر
#Y#
ر
#Y -0.5 - 0.5ر 0.5 - 1.5ر 1.5 - 2.5ر 2.5 - 3.512
0000
120000
1400
00
140000
#Y #
#
ر
#Y#
#Y
ر 3.5 - 20
1000
00
100000
40 0 40 80 Kilometers40000 60000 80000 100000 120000 140000 160000 180000 200000
48
Annual trend observed for the periodof 81-90
ر##
#N40000 60000 80000 100000 120000 140000 160000 180000 200000
#####
## ### #Y#ر # ####Y # ### ## ###Y##
ر# #Y##
#Y AT 81-90# -20 - -3.5
3 5 2 5
Border lineN
1800
00
180000
2000
00
200000ر #Y###
# #####Y## #
# ##Y#Y#
ر## ر
#
# -3.5 - -2.5# -2.5 - -1.5# -1.5 - -0.5#Y -0.5 - 0.500
0 14
1600
00
160000
1 0
#
#
#ر
#Y#Y #
#
0 5 0 5ر 0.5 - 1.5ر 1.5 - 2.5ر 2.5 - 3.5
3 5 20
1200
00
120000
1400
0000
#Y
#Y
#Y
# #Y
ر 3.5 - 20
40000 60000 80000 100000 120000 140000 160000 180000 200000
1000
00
100000
40 0 40 80 Kilometers40000 60000 80000 100000 120000 140000 160000 180000 200000
49
Future Climate Modelling Rainfall in Palestine Future Climate – Modelling Rainfall in Palestine
• Future climate predictions derived from output from HadCM3:
the Hadley Centre coupled ocean‐atmosphere General Circulation Model (GCM).
O t t i d id f 300 k 300 k i• Output is averaged across grid‐squares of 300 km x 300 km in size
• Rainfall output is indicative only
50
The nearest GCM grid points in the study region
# #
3 4
#
1 2
5
N# #1 2
400 0 400 Kilometers
51
GCM grid point 1GCM grid point 1
80
Lon= 33.75; Lat=30.070
80
GCM 61-90
GCM 21-50
50
60
fall (mm)
30
40
erage Rainf
10
20
Ave
0
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
52
GCM grid point 2GCM grid point 2
Lon= 37.5; Lat=30.070
80
GCM 61-90
GCM 21-50
50
60
all (mm)
30
40
verage Rainf
10
20
Av
0
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
53
GCM grid point 3GCM grid point 3
Lon= 33.75; Lat=32.570
80
GCM 61-90
GCM 21-50
50
60
fall (mm)
30
40
Average Rain
10
20
A
0
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
54
GCM grid point 4GCM grid point 4
80
Lon= 37.5; Lat=32.5
60
70
GCM 61-90
GCM 21-50
50
60
nfall (mm)
30
40
Average Rain
10
20
A
0
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
55
Observed and GCM rainfall point 5Observed and GCM rainfall – point 5
180
200
GCM 61-90
140
160
180
(mm)
GCM 61 90
GCM 21-50
Observed
100
120
Rainfall (
40
60
80
Average
0
20
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov DecJan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
56
Observed annual rainfall (1961 90)(1961-90)
35 36
Observed 61-900 - 5050 - 100100 150
Border line
GCM future annual rainfall 100 - 150150 - 200200 - 250250 - 300300 - 350350 - 400400 - 450450 - 500
32 32
GCM future annual rainfall (2021-50)
50 500500 - 550550 - 600
N
Border line
35 36
30 0 30 60 Miles35 36
GC M 21-500 - 5050 - 100100 - 150150 - 200200 - 250250 - 300300 - 350
32 32
300 350350 - 400400 - 450450 - 500500 - 550550 - 600
N
5730 0 30 60 Mile s35 36
Remarks about modelling rainfall in Palestine Remarks about modelling rainfall in Palestine
1. Spatial and temporal variability of rainfall1. Spatial and temporal variability of rainfall
A stochastic space‐time rainfall model is required to generateA stochastic space time rainfall model is required to generate rainfall with required spatial and temporal resolutions
58
Remarks (continued)Remarks (continued)
2 T d i i f ll2. Trends in rainfall
Significant evidence of trends in past rainfall occurrenceSignificant evidence of trends in past rainfall occurrence, amounts and intensities; downwards trend in last decade.
Predictions for GCMs indicate significant reductions in f ll d bWB rainfall and increases in evapotranspiration but
prediction at large scale.
The scale needs to be refined for accuracy.
59
Remarks (continued)Remarks (continued)
3. Climate and land use change impact assessmentg p
Causes of observed changes in rainfall not well understood: gpossible links between climate and land use changes (such as the Israeli National Carrier which diverted the Jordan River to the Negev).
Major changes in economy and agriculture likely; can impact rainfall.
60
West Bank PRECIS domainWest Bank PRECIS domain
61
Validation for Control for PRECIS: West Bank Rainfall
Average total precipitation per month (Oct to Sep) Graph showing observed data (dashed) and location (triangles) compared to
simulated ERA15 re-analysis results (solid lines) for grid boxes over the West Bank
62
y ( ) g(numbered)
Validation for Control for PRECIS: Coastal Rainfall
63
Validation for Control for PRECISValidation for Control for PRECIS
64
Future simulation from PRECISFuture simulation from PRECIS
Average total precipitation per monthAverage total precipitation per month
Comparisons of Observed , ERA15, Control and A2 Future
65
Land Use change simulation from PRECISLand Use change simulation from PRECIS
Land use change (precipitation)
a) ERA15-land use change simulation (nclab) b) Absolute differences (mm) for precipitation between ERA15 (nclah) and ERA15 land use change (nclab) simulations
66
( ) g ( )
Impacts and adaptationsImpacts and adaptations
• In general, most of the impacts of climate change areexpected to amplify projected impacts of anthropogenicstresses resulting from accelerated population growth and ahigher standard of living;higher standard of living;
Th l ti t ib ti f li t h t th ll• The relative contribution of climate change to the overallimpact is not known.
• Therefore, measures to reduce the overall impact are, bydefault adaptations to climate change whosedefault, adaptations to climate change, whoseimplementation represents a potential win‐win strategy.
67
Impacts and adaptationsImpacts and adaptations
• Increased rain intensity plus a reduction in overallprecipitation will diminish vegetation cover and increasesurface runoff and desertificationsurface runoff and desertification.
• Rainfed agricultural fields will become more saline from• Rainfed agricultural fields will become more saline fromincreased evapotranspiration.
• Measures for combating desertification, such as afforestation, and methods for rehabilitating and regenerating naturaland methods for rehabilitating and regenerating natural vegetation are also adaptations for climate change.
68
Impacts and adaptationsImpacts and adaptations
• Increased surface runoff will increase flash floods during peakwaterflows, damaging human structures and crops.
• Possible adaptations include water‐sensitive urban planningto reduce surface runoff and promote water infiltration intoto reduce surface runoff and promote water infiltration intothe soil, and conservation and rehabilitation of naturalvegetation in rural areas.g
69
Impacts and adaptations Impacts and adaptations
• Water supply may fall to 60% of current levels by 2100, due todi i i i li i i d d d ifsedimentation in reservoirs, salinization and reduced aquifer
recharge. Increased surface runoff will reduce aquiferrecharge; and sea level rise and the intrusion of seawater intorecharge; and sea level rise and the intrusion of seawater intothe coastal aquifer will further damage groundwater.
• The quality of stored water will degrade due to salinization,and the increased surface runoff will transport dissolvedppollutants to waters reservoirs, often causing algal blooms.
• Adaptation: water conservation, reuse of treated wastewater,desalination, cloud seeding etc will serve asfuture adaptations necessitated by climatechange. 70
Impacts and AdaptationsImpacts and Adaptations
• The need to collect and save water for drought years will increase withg ygreater temporal uncertainty. Sufficient adaptation includes better use ofrecycled water and use of additional water resources.
• In Palestine storage is still far from existence but in a few years timePalestine will face severe drought problems. It is unless we act now we willwork without planning.
• Better management of aquifer recharge through water‐sensitive urban• Better management of aquifer recharge through water‐sensitive urbanplanning may reduce surface runoff.
• Urban development greatly decreases aquifer recharge and increases thechances of flash flooding and decreases the quantity andquality of freshwater supplies. Using infiltration basinsq y pp greduces surface runoff and enables aquifer rechargeemploying relatively inexpensive measures. 71
Impacts and AdaptationsImpacts and Adaptations
• For example, roof‐collected water serves both to recharge the aquifer andto reduce the load of municipal drainage systems.to reduce the load of municipal drainage systems.
• Since natural vegetation traps soil moisture and reduces surface runoff,conservation of natural and man‐made forests may also serve as anadaptation to the projected increase in flash flooding due to climate‐change.
• Adaptation to more frequent flooding is improving drainage systems andfl d iti b l iflood‐sensitive urban planning.
72
Developing countries are the most vulnerable to climate changeto climate change
• Impacts are worse ‐ already more flood and drought prone and a large share of the economy is in climate
iti tsensitive sectors.
• Lower capacity to adapt because of a lack of financial• Lower capacity to adapt because of a lack of financial, institutional and technological capacity and access to knowledgeknowledge.
• Net market sector effects are expected to be negative in p gmost developing countries.
73
Thank youThank you
74