Table schema:
CREATE TABLE table_name_68 (water__sqmi_ INTEGER, land___sqmi__ VARCHAR, longitude VARCHAR)

Question: What's the total of Water (sqmi) with a Land (sqmi) of 35.918 and has a Longitude that is smaller than -97.115459?
SQL: SELECT SUM(water__sqmi_) FROM table_name_68 WHERE land___sqmi__ = 35.918 AND longitude < -97.115459