Table: region_water_data
Columns: administrative_region
population_2002_census_data
surface_km_2
main_rivers
average_annual_rainfall_mm
average_annual_runoff_mm
per_capita_average_annual_renewable_water_resources_m_3

Question: Name the annual rainfail for 2002 population being 493984
SQL: SELECT "average_annual_rainfall_mm" FROM region_water_data WHERE "population_2002_census_data" = 493984

Question: Name the most population 2002
SQL: SELECT MAX("population_2002_census_data") FROM region_water_data

Question: Name the total water resources m3 for rainfall being 650
SQL: SELECT COUNT("per_capita_average_annual_renewable_water_resources_m_3") FROM region_water_data WHERE "average_annual_rainfall_mm" = '650'