the potential benefits of green water credits
DESCRIPTION
The potential benefits of Green Water Credits. Part 2: Quantifying profits for downstream water users. Peter Droogers Wilco Terink Johannes Hunink Sjef Kauffman Godert van Lynden. WHAT to quantify?. Supply Biophysicial assessment Supply vs. Demand Cost-benefit analysis. - PowerPoint PPT PresentationTRANSCRIPT
The potential benefits ofGreen Water Credits
Part 2:Quantifying profits for
downstream water usersPeter Droogers
Wilco TerinkJohannes Hunink
Sjef KauffmanGodert van Lynden
WHAT to quantify?
• Supply Biophysicial assessment
• Supply vs. Demand Cost-benefit analysis
OVERALL BENEFIT-COST ANALYSIS
Recall: changes in supply
Required: an integrating tool
• Impact of changes in water-soil dynamics on:– upstream
• rainfed improved production– downstream
• hydropower• domestic water supply• irrigation
• Benefit-cost analysis
• Integrations tool: WEAP
WEAP Tool
WEAP: Validation
Masinga Inflow
Masinga Outflow
Kamburu Outflow
Gitaru Inflow
Kindaruma Outflow
Kiambere Outflow
Changes reservoir storage
00_Base 01_Bench 02_ConsTill 03_ContTill 04_FanyaJuu 05_GrassStrips 06_MicroCatchments 07_Mulching 08_Rangelands 09_Ridging 10_Riverine 11_TrashLines
Reservoir Storage VolumeAll Reservoirs (9), All months (12)
Jan2005
Mar2005
May2005
Jul2005
Sep2005
Nov2005
Jan2006
Mar2006
May2006
Jul2006
Sep2006
Nov2006
Milli
on C
ubic
Met
er
60
55
50
45
40
35
30
25
20
15
10
5
0
Results: Reduction in water shortage
00_Base 01_Bench 02_ConsTill 03_ContTill 04_FanyaJuu 05_GrassStrips 06_MicroCatchments 07_Mulching 08_Rangelands 09_Ridging 10_Riverine 11_TrashLines
Unmet DemandAll Demand Sites (13), All months (12)
2005
Milli
on C
ubic
Met
er
0.0-0.5-1.0-1.5-2.0-2.5-3.0-3.5-4.0
-4.5-5.0-5.5-6.0-6.5-7.0
Results: Increase in hydropower
00_Base 01_Bench 02_ConsTill 03_ContTill 04_FanyaJuu 05_GrassStrips 06_MicroCatchments 07_Mulching 08_Rangelands 09_Ridging 10_Riverine 11_TrashLines
Hydropow er GenerationAll Reservoirs (9), All months (12)
2005
Thou
sand
Gig
ajou
le
180
160
140
120
100
80
60
40
20
0
Results: Increase in Benefits
Results: Benefit-Cost Analysis
• 20% of area ~ 100,000 smallholders
Benefits Costs mUS$/y ha 01_Bench 9.9 92,865 02_ConsTill 1.0 52,766 03_ContTill 4.9 52,766 04_FanyaJuu 9.0 92,865 05_GrassStrips 5.3 92,865 06_MicroCatch 1.6 1,000 07_Mulching 5.1 92,865 08_Rangelands 0.8 136,916 09_Ridging 8.9 52,766 10_Riverine 2.0 10,000 11_TrashLines 3.4 92,865
Costs Construction Maintenance
ha US$/ha US$/ha /y mUS$/y 92,865 100 20 2.8 52,766 0 0 0.0 52,766 0 0 0.0 92,865 200 20 3.7 92,865 50 20 2.3 1,000 500 20 0.1
92,865 0 0 0.0 136,916 50 0 0.7 52,766 100 20 1.6 10,000 100 20 0.3 92,865 50 20 2.3
B/C
mUS$/y mUS$ 2.8 7.1 0.0 1.0 0.0 4.9 3.7 5.3 2.3 3.0 0.1 1.5 0.0 5.1 0.7 0.1 1.6 7.3 0.3 1.7 2.3 1.1
DISCUSSIONS, CONCLUSIONS
Wrapping up
• GWC beneficial for:– upstream– downstream
• Analysis tools:– SWAT: (upstream) supply– WEAP: (downstream) demand
• Steps– Understand current situation– Explore options
• GWC– Biophysical component– Socio-economics– Institutional– Financial
Discussion / conclusions
• Smaller focus area– Current study: 1.8 million ha total; 0.5 million ha rainfed– Target areas– C/B analysis
• Definition of GWC options– Practical WOCAT expertise in implementation phase
• Monitoring network– Update according to recently finished survey– Indicators to evaluate effectiveness of implementation
THANK YOU