Tinaja After Summer Storm September 2004 September 4, 2004 Chris Gill Tinajas are basins in watercourses that fill with water during seasonal rainstorms. Some are very large. Even where there are no year-round springs, water can be abundant during some times of year. Share on Facebook Share on Twitter Share on LinkedIn Next Author: Chris Gill Ranching, wildlife management, finance, oil & gas, real estate development and management.