. Contour trenching effects on streamflow from a Utah watershed. Watershed management Utah; Drainage. Figure 7.—Modified Venturii-trapezoidal flume in a broad- crested weir section constructed in the late 1930 's on the Davis County Exper- imental In addition to the streamflow and precipitation records, other data have been collected in Farmington Canyon that contributed to the conclusions reached here. Soil moisture measurements have been made on the trenched area and on an adjacent untrenched area since 1965. Vegetation measurements were taken as point samples along permanent tra
. Contour trenching effects on streamflow from a Utah watershed. Watershed management Utah; Drainage. Figure 7.—Modified Venturii-trapezoidal flume in a broad- crested weir section constructed in the late 1930 's on the Davis County Exper- imental In addition to the streamflow and precipitation records, other data have been collected in Farmington Canyon that contributed to the conclusions reached here. Soil moisture measurements have been made on the trenched area and on an adjacent untrenched area since 1965. Vegetation measurements were taken as point samples along permanent transects. Two 100-foot transects were located in the trenched area and two others in an adjacent untrenched area. In addition to the regular snow courses, four snow courses were established in conjunction with the contour trenches in the Halfway Creek drainage. Two of the courses were so located in the trenched area that each course crossed one trench. RESULTS AND DISCUSSION The relationship of three factors, streamflow from the Halfway Creek drainage, streamflow from the Miller Creek drainage, and precipitation at the Rice Climatic Station, was determined from records for the 12 years immediately prior to trenching. Correlations of these factors for different streamflow and precipitation periods were the basis used to evaluate effects of contour trenching. The general nature of the relationship before trenching of the Halfway Creek streamflow, the Miller Creek streamflow, and the Rice Climatic Station precipitation is shown in figure 8. Precipitation catch at Rice Climatic Station tended to be greater than that on Halfway Creek drainage and less than that on the Miller Creek drainage. The extent of this error was accentuated in wet years, primarily because wet years are the result of more snow. Wind generally carries snow out of the Half- way Creek drainage but into the Miller Creek drainage. The movement of snow from Halfway Creek drainage into adjoining drainages is a signif
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectdrainage
