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Filters: Collection Name: "Environmental Geology in Utah" Collection: uum_map
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1 Flooding from snow runoff, mouth of Weber Canyon. Weber River has overtopped its normal channel banks and covers its flood plain. Periodically, structures situated on this flood plain become inundated. Note: ancient Lake Bonneville terraces may be seen on the mountain front.uum_mapImage
2 Big Cottonwood Creek flooding in Salt Lake City. Numerous houses along its banks were flooded in 1952.uum_mapImage
3 Sandbagging of Big Cottonwood Creek to confine its flow. Bridge was temporary, to span floodwaters.uum_mapImage
4 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.uum_mapImage
5 Cloudburst flood caused erosion of the North Bench in Salt Lake City. Eroded channel begins where paved street ends.uum_mapImage
6 Breach of highway embankment on East Bench in Salt Lake City caused extensive damage to residential neighborhood downslope.uum_mapImage
7 Pavement of Big Cottonwood Canyon Road, east of Salt Lake City, torn up by cloudburst flood in August 1969.uum_mapImage
8 Damage to newly laid curb and gutter on Salt Lake City's East Bench, resulting from August 1969 cloudburst.uum_mapImage
9 Damage to the Salt Lake City Cemetery from a flood channeled in Perry's Hollow, a normally dry drainage course.uum_mapImage
10 Erosion of a hillside fill- more than 2 feet from a single cloudburst. Sediment is deposited at foot of slope in neighbor's back yard.uum_mapImage
11 Erosion of fill placed from home construction. Deposition of material in foreground gives braided stream appearance.uum_mapImage
12 Monument to campers who lost their lives in cloudburst flood in Sheep Creek Canyon, in Flaming Gorge National Recreational Area, 1963. Note: boulder on which bronze monument has been placed is striated and polished by glacial action in the ice age.uum_mapImage
13 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.uum_mapImage
14 Nose of sagebrush-covered debris pointing out into grassy valley, in Sanpete County. Debris deposit was a sharply defined mud-rock flow.uum_mapImage
15 Mud-flow which occurred in same season in which photo was taken, in Tooele County. Cloudburst probably descended on the background watershed in the Oquirrh Range.uum_mapImage
16 Rock-debris flow from source onto road in foreground.uum_mapImage
17 Cone or fan of debris deposited on highway after cloudburst flood in Big Cottonwood Canyon.uum_mapImage
18 Mud-rock flow from upper steep-walled tributary canyon into Echo Canyon (Summit County) and over Interstate 80. Note that one lane of traffic has been cleared of debris. Aerial photo July 1968.uum_mapImage
19 Mud-flow debris cleared from residence after storm on Salt Lake City's East Bench.uum_mapImage
20 House carried on mud-flow from Davis Creek, Davis County. Historic photo, 1930. Debris covered the highway to a depth of about 6 feet.uum_mapImage
21 Expensive new house being constructed on banks of perennial stream which is subject to flood each spring and throughout the summer. Should not a form of flood plain zoning be in effect?uum_mapImage
22 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.uum_mapImage
23 Landsliding of an abutment encroaching on the reservoir which is near its peak stage (elevation). Structures for impoundment of flood waters must be sited with strict regard for geological conditions.uum_mapImage
24 A reservoir showing the earth-fill dam and a landslide block separated from the abutment in the foreground. Opposite abutment is an ancient landslide.uum_mapImage
25 Engineering plan for a proposed reservoir in Salt Lake City. Note the anomalous contour spacing under the arrow. This indicates that the hillside has slid in the past. Construction of a reservoir here would inundate the toe of an ancient landslide and destroy the balance and stability of the weak landslide mass.uum_mapImage
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