CREATE TABLE table_28224 ("Region" TEXT, "Land area  ( km 2  ) " TEXT, "Rainfall by depth  ( mm/year ) " FLOAT, "Rainfall by volume  ( km 3 /year ) " TEXT, "Surface run off  ( km 3 /year ) " TEXT, "Infiltration  ( km 3 /year ) " TEXT, "Evapotranspiration  ( km 3 /year ) " TEXT)

In the Central region, what was the infiltration (km 3 /year)?
SELECT "Infiltration (km 3 /year)" FROM table_28224 WHERE "Region" = 'Central'
SELECT "Infiltration (km 3 /year)" FROM "table_28224" WHERE "Region" = 'Central'