Table: asturias_dams_reservoirs
Columns: reservoir
basin
location
type
height_m
length_along_the_top_m
drainage_basin_km
reservoir_surface_ha
volume_hm

Question: What is listed in drainage basin when the type is gravity and the reservoir surface is 34.36?
SQL: SELECT "drainage_basin_km" FROM asturias_dams_reservoirs WHERE "type" = 'Gravity' AND "reservoir_surface_ha" = '34.36'

Question: What is the drainage basin when the reservoir suface is 6.14?
SQL: SELECT "drainage_basin_km" FROM asturias_dams_reservoirs WHERE "reservoir_surface_ha" = '6.14'

Question: What is the volume when the resrvoir is Tanes?
SQL: SELECT "volume_hm" FROM asturias_dams_reservoirs WHERE "reservoir" = 'Tanes'