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Table 3.--Sediment-transport equations derived from sediment discharges measured at station 09260050 Yampa River at Deerlodge Park [Qs' sediment discharge in tons per day; Q, water discharge in cubic feet per second; R2, coefficient of determination; SE, standard error of estimate in percent; n, sample size; mm, millimeter] Type of sediment discharge Regression equation R2 SE n Total----------------------- Qs = 0.290 Ql.26 0.79 67 31 Suspended------------------- Qs = 0.125 Ql.3S 0.76 88 33 Bedlaad--------------------- Qs = 0.702 QO.80 0.54 79 31 Sand and gravel------------- Qs = 0.0160 Ql.48 0.82 73 31 Silt and clay--------------- Qs = 0.486 Ql.12 0.56 116 31 0.062-0.25 mm-----~--------- Qs = 0.000545 Ql.77 0.88 65 31 0.25-1.0 mm----------------- Qs = 0.0904 Ql.18 0.55 130 31 Coarser than 1.0------------ Qs = 0.147 QO.76 0.24 201 31 Juan River near Bluff, Utah (Leopold and others, 1964, p. 230), exhibit con- spicuous differences in the relation of sediment discharge to water discharge duri ng ri sing spri ng flows and recessi ana 1 summer flows. As a resul t of observations during the 1982 field season, in which suspended-sediment concen- trations during rising streamflaws appeared to be generally higher than concentrations during recessional streamflows, it was suspected that seasonal differences in sediment discharge may be typical of the Yampa River at Deerlodge Park. Streamflow and sediment di scharge data were reexami nedto determi ne the significance of seasonality on sediment transport through Deerlodge Park. Sediment discharge and water discharge data from 1982 and 1983 were subdivided into groups on the basis of occurrence during- the rising hydrograph or the recessional hydrograph. ~'easurements made from February through May were categorized as rising-hydrograph measurements, and those made from June through July were categorized as recessional-hydrograph measurements. Least- squares linear-regression equations describing measured sediment discharge as a function of water discharge, similar to those in table 3, were recomputed from data in the subgroups. The regression equation slope and intercept values from both subgroups were analyzed with a Student t-test to determine whether significant differences existed between sediment discharge relations associ ated with ri si ng and recess i ona 1 hydrographs. At the 95-percent 1 eve 1 of s i gnifi cance, no differences between the sedi ment transport equat -j ons represent i ng ri sing and recess i ona 1 hydrographs were confi rmed for total sediment discharge, suspended-sediment discharge, or the discharge of sediment 16