Water for people.pdf - WHO Thailand Digital Repository

Figure 3.2: Calculated available water resources, water demand, internal renewable water resources and water supplyAvailable water resourcesInternal renewable water resources0–50 50–100 100–150 150–200 200–250 250–300 300–350 350–400 400–450 450–500 >500 mm/yearWater supplyWater demand0–5 5–10 10–15 15–20 20–25 25–30 30–35 35–40 40–45 45–50 >50 mm/yearThe four indicators represented in the above maps clearly show differences in global water resources, supply and demand. However, they are not usable as indicators at a local levelbecause the scale is too large.Source: Watermodel, presented at the Second World Water Forum.3 5 / S E T T I N G T H E S C E N E