Exercise 7-Working rivers BASIN QUADRANGLE MISSISSIPPI (1982) Mississippi has a

Question

Exercise 7-Working rivers BASIN QUADRANGLE MISSISSIPPI (1982) Mississippi has a mature landscape where broad-floored river valleys are fed by a well-developed tributary system. Study the floodplain of the meandering Pascagoula River 1. What geologic term applies to Bilbo Dead River, Woodward Dead River and Wells Lake? 2. Note the location of swamps on the floodplain. a. Are they near the river or near the valley walls? b. Does the floodplain slope toward the river channel or away from the river channel? A river can be rejuvenated when base level is lowered either by erosion of a temporary base level- controlling unit, a drop in sea level or uplift of the land surface. When a river is rejuvenated it will alter its valley by downcutting. Two examples of rejuvenation are where a floodplain is dissected and where a river downcuts forming a V shaped valley but retaining its meandering pattern. ANDERSON MESA QUADRANGLE COLORADO (1994) Note the meandering pattern of the Dolores River 1. a. In what direction does the Dolores River flow? 2. The river flows from a low area through an area of greater relief. Explain the origin of this b. What is the basis for your answer? present-day meandering,. V shaped, steep-sided stream pattern.

Explanation / Answer

1) woodland dead river is oxbow lake and bilbo dead river, wells lake both are the point bars which are derived from the main course of the river.

2) a) yes, this all three geological features are developed near the main course of the river.

b) the flood plain slope away from the channel of the river.

1) a) the dolores river flowing in the south west direction.

b) The river flow southwest in a canyon past Rico, receiving the West Dolores River, after that flows into McPhee tank near Dolores in Montezuma County. shaped by McPhee barrier, the tank is about 10 miles (16 km) long and divert flows of the higher Dolores River for irrigation.

c)

The Dolores River rise in a field call Tin Can Basin, Hermosa Peak in the San Miguel Mountains, in Dolores County, Colorado.. The river flow southwest in a canyon past Rico, receipt the West Dolores River, then flow into McPhee Reservoir close to Dolores in Montezuma County.

Downstream as of McPhee Dam, the river re-enters Dolores County and carves the Dolores River Canyon, This piece of the Dolores stream is renowned for its uncovered sedimentary strata, desert wildlife, and through years of important snowmelt for its white water

progressing north, the Dolores cuts across the . instantly lower Paradox Valley it is coupled by the San Miguel River, its core tributary, starting the east.Due to diversion on the main stem, the San Miguel is characteristically the same dimension as the Dolores if not well-built, as long as most of the run below the flowing together in dry years.

under the flowing together with the San Miguel, the Dolores enter Mesa County, graceful north-northwest past Gateway and then turn-off west into Utah. The last section of the river, completely inside Grand County, join the Colorado near the historic Dewey Bridge

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