. Contour trenching effects on streamflow from a Utah watershed. Watershed management Utah; Drainage. 10 r Figure 10.—The relationship between seasonal low stream- flow from the Halfway Creek drainage and that from the Miller Creek drainage, 1962-1968. cc (J > < O Before trenching A After trenching # Mean before ? Mean after. 10 1ILLER CREEK STREAMFLOW (hiches) Low Streamflow Period As defined for this analysis, the low streamflow period includes the streamflow for July through February. Streamflow during this period is almost exclusively base- flow, water from deep seepage and interflow
. Contour trenching effects on streamflow from a Utah watershed. Watershed management Utah; Drainage. 10 r Figure 10.—The relationship between seasonal low stream- flow from the Halfway Creek drainage and that from the Miller Creek drainage, 1962-1968. cc (J > < O Before trenching A After trenching # Mean before ? Mean after. 10 1ILLER CREEK STREAMFLOW (hiches) Low Streamflow Period As defined for this analysis, the low streamflow period includes the streamflow for July through February. Streamflow during this period is almost exclusively base- flow, water from deep seepage and interflow. Precipitation occurring during the period contributes little water directly to streamflow. Summer storms are generally light and less than 2 percent of their precipitation results in direct runoff (Croft and Marston 1950). Fall and winter precipitation recharge the soil mantle and build the snowpack, but do not appreciably affect streamflow until snowmelt and spring runoff, March through June. Consequently, the low streamflow period reflects the watershed's drainage char- acteristics while the influence of concurrent precipitation is negligible (Hall 1968). Soil moisture data collected at various places on the Davis County Experimental Watershed (Johnston, Tew, and Doty 1969) and the fact that two-thirds of the annual streamflow consistently occurs during the spring flow period indicate that the soil mantle is fully recharged at the beginning of each growing season. Fluctuations in streamflow, particularly on Miller Creek, sometimes occur at the beginning of the low flow period due to delayed snowmelt. For the most part, however, this is a rather stable streamflow period. The relationship between the low flow of Halfway Creek and that of Miller Creek was determined for the pretreatment years (fig. 10). This resulted in an r^ of , a low correlation apparently due to events on Miller Creek that effect streamflow while not effecting streamflow on Halfway Creek. The most pr
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