For the first half of the piece, I used a triangle oscillator to create a solo section. For the second half, I used a pulse oscillator to create a poly section.I made the reverb values of the two sections 0.07 and 0.02, respectively.
The solo section takes hydrology data of the Feather River at Oroville, CA from Oct 1902 to Sep 1977. The poly section adds data Trinity River at Lewiston, CA from Oct 1912 to Sep 1960. Both data sets come from the Time Series Data Library on DataMarket. Emmerich Anklam, October 2013.