Laserfiche WebLink
34 <br />the pre-dam mean discharge was 124 m3/s and the post-dam mean was 127 m3/s, a <br />difference of around 2%. <br />Differences in daily discharges for normal, wet, and dry years are summarized <br />below by hydro-period. These summaries are based on the representative water years <br />listed in Table 1, rather than all of the years of a particular type (e.g., wet water years are <br />represented by 1947 and 1998 for the pre-dam and post-dam conditions and do not <br />include all of the wet years in the two sub-series). Daily flow hydrographs and flow <br />duration curves for each comparison are included in Appendix A. <br />Base flow period <br />In the Green River, base flows tended to be considerably higher and less variable <br />across all types of water years during the post-Flaming Gorge period than in the pre- <br />Flaming Gorge period (Figures Al-A9). Differences between average daily base flows <br />for the representative water years are summarized in Table 3. In normal and wet years, <br />Table 3. Summary of base flows in the Green and Yampa Rivers for representative wet, <br />normal, and dry years under pre- and post-Flaming Gorge conditions. Percentage <br />differences refer to the amount and direction of change from the pre-dam condition. <br /> Green river Yampa River <br />Condition Pre-dam Post-dam Difference Pre-dam Post-dam Difference <br /> (m3/s) (m3/o (%) (m3/s) (m3/S) (%) <br />Wet 54.3 117.7 +117 10.5 20.5 +95 <br />Normal 44.9 84.6 +88.7 17.7 16.8 -5 <br />Dry 32.6 46.4 +42.4 10.9 16.4 +50 <br />lowland runoff events occurring near the end of the base flow period were likely <br />responsible for infrequent periods of relatively high discharge under pre-dam conditions.