Water Supply and Demand Bangkok 2013
Water Supply Country Water supply (billion m3/yr) Groundwater supply Bangladesh Cambodia Indonesia Lao PDR Maldives Mongolia Nepal Philippines Sri Lanka527.8 Thailand Viet Nam
Measuring Supply Water is expensive to move from watershed to watershed – Heavy so costly to move – Low valued (except for drinking water) Correct measure of supply is at watershed level- not country level Monthly pattern also matters – Expensive to store across months – Requires a dam
Measuring Water Supply Care about fresh water (not saltwater) Care about supply relative to land and people Not every country the same – Some have abundant water – Some have very little – Some have scarce water/land but abundant water/person
Water Supply Country Water supply/land (m3/ha) Water supply/capita Bangladesh Cambodia Indonesia Lao PDR Maldives Mongolia Nepal Philippines Sri Lanka Thailand Viet Nam
Measuring Demand Four primary users – Agriculture- largest user – Industry- second largest – Residential- highest valued
Water Demand Country % Agriculture% Industrial% Residential Bangladesh Cambodia Indonesia Lao PDR Maldives Mongolia Nepal Philippines Sri Lanka Thailand Viet Nam
Water Allocation Suppose two users: farmers and U&I U&I more price inelastic than farmer Suppose that farmers have more water than efficient amount What is loss?
Supply Price Water for farmers Water for Urban/Industry Initial Allocation Inefficiency Farmer U & I
Climate Change Suppose that climate change reduces water supply Suppose farmer water is protected Water must come from U&I Efficiency loss grows
Supply Price Water for farmers Water for Urban/Industry Farmer U&I
Climate Change Suppose that climate change reduces water supply Suppose water is reallocated from farmers to U&I Efficiency losses shrink Water management objective- equate marginal value of water across users
Supply Price Water for farmers Water for Urban/Industry Farmer U&I