Late in 2000, the first version of the high school curriculum Life in Our Watershed: Investigating Streams & Water Quality was co-authored by Greg Suba and Eva Butler with support from the Splash team. It was reissued in 2005 as Version 2. Version 3, which features a new Student Handbook and Teacher's Manual, was issued in April 2009 as the Splash Secondary Curriculum for use in middle schools and high schools.
In December 2006, the curriculum was enhanced with the addition of a pictorial Guide to Stream Benthic Macroinvertebrates (BMIs). The BMI bench top guide was designed to assist students in identifying insects under the microscope during the bioassessment activity. The guide provides a key for sorting stream insects in order to investigate water and habitat quality in local streams.