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<br />1 00 ~ "'^o,..... <br />~Q>, \~~ ~t:: <br />~(,~~ \.. <br />Figure 13. Sediment Load Relationships During the Pre-Peak and Post Peak Periods on the <br />Gunnison River near Grand Junction. Source: Pitlick et aI. (1999). <br />All s~p~rd ~~ ? ~f IJ.J/t;o-J """fJ tJ ~, <br />pI> <br /> <br />000338 <br /> <br />Draft - Do Not Cite <br /> <br />5000 <br />4500 <br />4000 <br /> <br /> <br />/' <br />- A"e-peak ' <br />- Post-peak J' <br />~t.~ <br />f <br /> <br /> <br />- <br />~ 3500 <br />o <br />~ 3000 <br />.;: <br />G) 2500 <br />E <br />- 2000 <br />" <br />~ 1500 <br />..J <br /> <br />1000 <br />500 <br /> <br />o <br />o <br /> <br />20 <br /> <br />14 <br /> <br />August 2003 <br /> <br /> <br />tJJ..~ <br />~?0Ct"s ~ <br /> <br />40 <br /> <br />60 <br /> <br />80 <br /> <br />Flow (m3/s) <br /> <br />flow was greater than 40 m3/s (1,410 cfs). For flows greater than about 52.5 m3/s (1,850 cfs), the <br />post-peak relationship was used for times after the peak in the annual discharge hydrograph. <br /> <br />As with the Van Steeter and Pitlick model, total suspended sediment loads were <br />estimated by integration, using the daily mean flow in the river. <br /> <br />2.4 HABITAT MAINTENANCE THRESHOLDS <br /> <br />Although the transport of suspended sediment in the Gunnison River is important, bed- <br />load transport is also of critical concern to the maintenance of the river channel and endangered <br />fish habitats. Many relationships can be used to evaluate bed loads for the Gunnison River. <br />These relationships often require a large amolUlt of accurate, site-specific data Particle size <br />distributions are often needed, in addition to water depth, shear forces, and critical shear forces <br />(Henderson 1966). Pitlick et al. (1999) estimated bed loads for the Colorado River by using an <br />empirical relationship developed by Parker et al. (1982). Because of their extensive reliance on <br />