Appendix 1. Average monthly diurnal discharge hydrographs for three reaches under the No Action and Modified Low Fluctuating Flow (MLFFA) alternatives, based on a GCD release volume of 1 million acre-feet. Solid lines denote the average monthly diurnal hydrograph generated during the on-peak demand period (Monday-Saturday), and dashed lines denote the hydrographs during off-peak periods (Sunday). The economic monthly value of power generated from GCD (in millions of 1996 U.S. dollars) under these alternatives are shown. Assuming a hydropower production cost of $1.80/MWh (Harpman 1998) results in a production cost of $875,000 (in 1996 dollars) under both alternatives in January and $890,000 in August. The river miles locations (downstream from GCD) of the hydrographs (reach midpoints) are shown in parentheses beside the reach names.