Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_25983027_1 ( rainfall_by_depth__mm_year_ VARCHAR, infiltration__km_3__year_ VARCHAR )

### Question ###
How many regions had rainfall infiltration (km 3/year) of 9.3?

### Accurate SQL ###

SELECT COUNT(rainfall_by_depth__mm_year_) FROM table_25983027_1 WHERE infiltration__km_3__year_ = "9.3"