CREATE TABLE table_25983027_1 (rainfall_by_depth__mm_year_ VARCHAR, infiltration__km_3__year_ VARCHAR)

How many regions had rainfall infiltration (km 3/year) of 9.3?
SELECT COUNT(rainfall_by_depth__mm_year_) FROM table_25983027_1 WHERE infiltration__km_3__year_ = "9.3"
SELECT COUNT("rainfall_by_depth__mm_year_") FROM "table_25983027_1" WHERE "9.3" = "infiltration__km_3__year_"