CREATE TABLE table_25983027_1 (infiltration__km_3__year_ VARCHAR2, region VARCHAR2)

In the Central region, what was the infiltration (km 3 /year)?
SELECT infiltration__km_3__year_ FROM table_25983027_1 WHERE region = "Central"
SELECT "infiltration__km_3__year_" FROM "table_25983027_1" WHERE "Central" = "region"