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Filters: Collection Name: "Environmental Geology in Utah"
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76 Photograph of a relief map using oblique illumination to highlight the topography. Note the steep slope along the east shore of Bear Lake. This slope marks the active Bear Lake Fault bounding the lake on the east. The lake sits in a graben, a downdropping block of earth.Image
77 Portion of the East Bench along the mountain front in Salt Lake County. It has been dissected by strands of the Wasatch Fault. Since this photo was taken a housing development has been built on this terrain.Image
78 Reservoir slopes failing just upstream from dam. A failure overtopping the road would cause turbidity in the drinking water for a large city since the intake is directly downstream and in line with the current.Image
79 Rock-debris flow from source onto road in foreground.Image
80 Rockfall, American Fork Canyon, February 1970. Observer stands on one of the boulders of rockfall looking across at debris fan which was washed down when aquaduct was struck and severed on the mountain side. Note height at which tree in foreground was broken off by boulder.1970-02Image
81 Same view showing notch in cut slope, the result of a failure onto the road soon after opening to traffic (p1274n030). Landsliding is predictable.Image
82 Sandbagging of Big Cottonwood Creek to confine its flow. Bridge was temporary, to span floodwaters.Image
83 Sediment load is a factor to be considered with surface streams. This graph shows the relationship between mean annual sediment load and mean annual precipitation for the specific environment where the mean annual temperature is 40 degrees F. Other curves may be drawn for various other mean annual temperatures. Note that in this regime sediment yield is greatest at about 8 or 9 inches of precipitation. This factor must be given careful consideration when designing flood impoundment structures. The greater the sediment load the quicker the reservoir fills up.Image
84 September 1970 flooding, by widespread cloudburst, of the San Juan River, seen here to occupy most of its floodplain. Bridge is only link to civilization for approximately 1,000 Navajo Indians. Note that only the left one-third of bridge has escaped attack by rising flood waters (other two-thirds appear muddy). Oblique aerial view. Most of Utah is subject to cloudburst flooding from April to September. Cloudbursts are of short duration and high intensity.1970-09Image
85 Slide of fill material in high, steep fill slope on Salt Lake City's North Bench.Image
86 Standard Salinity Hazard chart for groundwater from all aquifers in the Bear Lake area. This chart is used for agricultural purposes. Note that all waters sampled are satisfactory for all plant types.Image
87 Steep, high, artificial fill slopes in or near the Wasatch Fault Zone. Downslope from these fills lie dense residential developments. Atop these fills are residences. How may these earth materials be expected to react to seismic vibrations?Image
88 Surficial or shallow ground water is subject to pollution from buried solid wastes. Leaching of the wastes can occur in time. This excavation is for a land fill operation where ground water was encountered at a depth of less than 6 feet.Image
89 Swelling of clay soil as it takes on additional moisture heaved up this garage floor and cracked it.Image
90 Table listing types of geologic terrain in the Bear Lake area and their limiting factors for fluid waste disposal by individual home systems. Yellow indicates caution is required and red indicates a critical situation.Image
91 These twin tanks deverge from bottom to top. Differential settling of their foundations caused this.Image
92 This pattern of cracking in the unconsolidated clays and silts from ancient Lake Bonneville is the result of shrinking upon drying. Geologic material may be considered as dynamic, not static, and may deform readily under stress. Deformation may damage or destroy structures placed upon this type of geologic material.Image
93 This water storage reservoir has failed; it was placed improperly upon a stratum of gypsum (white layers in photo) which partially dissolved.Image
94 Undisturbed hillside failing because of lateral and vertical erosion by creek. Debris is continuously removed from toe of sliding hillside by the creek.Image
95 Upstream from the monument was this scene in May 1969. Broken tree trunks and picnic table (beneath feet of observer in photo) recently re-exposed from under 8 feet of debris.1969-05Image
96 View across City Creek Canyon in Salt Lake City, showing amphitheater-like appearance of ancient landslide. Houses are short distance to left of landslide.Image
97 View across the north end of Bear Lake looking east at the truncated spurs, geomorphologic evidence of the Bear Lake Fault.Image
98 View along the highway traffic lanes and the dam abutment at the newly created cut slope.Image
99 Weber Basin Job Corpsmen digging out mudslide debris from hillside house.Image
100 Well points (small diameter water wells) used to dewater a hillside in loose sand to stabilize it after cut was made for roadway.Image
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