SELECT rainfall_totals__million_m_3__ FROM table_26609958_1 WHERE hydrographic_basin = "Martha Brae, River"
Ketika Martha Brae, sungai adalah cekungan hidrografi berapa total curah hujan (juta m 3)?
CREATE TABLE table_26609958_1 (rainfall_totals__million_m_3__ VARCHAR, hydrographic_basin VARCHAR)