Changes in the relative status of central cities compared to their suburban rings are investigated for the periods 1920 to 1950, and 1950 to 1970. Longitudinal alterations in the relative statuses of the two components across metropolitan areas have primarily involved the suburban ring. Somewhat different processes of change were evident in the two time periods, particularly when metropolitan areas are distinguished by their age. In the 1920 to 1950 period, the oldest metropolitan areas evolved toward higher suburban than central city status, while newer metropolitan areas evolved toward higher central city than suburban status. In the 1950 to 1970 period, metropolitan areas generally moved toward a pattern of higher suburban than central city status, regardless of their individual characteristics such as age or period of development.

The construction of Gainesville Dam and other related channel alterations, completed in 1979, has resulted in changes to the stage-discharge relations in the vicinity. The lack of current-meter measurements, coupled with backwater conditions, makes definition of a single stage-discharge relation impossible. However, limit curves can be defined that would encompass such a relation. Backwater is defined as water backed up or retarded in its course as compared with water flowing under normal or natural conditions. This results in a rise in stage above normal water level while the discharge remains unaffected. Backwater is usually caused by temporary obstruetion(s) to the flow downstream. Backwater at Gainesville Dam is due to large tributary inflow and return of flood plain flows to the main channel during recessions. The discharges obtained from 105 computations of flow through the dam for the tailwater and 59 for the pool were plotted versus stage. These plots illustrate, by the scatter of these data points, the variations in backwater. Curves were drawn to envelope the extreme plot patterns showing possible ranges of several feet in stage for any given discharge for both the pool and the tailwater.

Changes in the relative status of central cities compared to their suburban rings are investigated for the periods 1920 to 1950, and 1950 to 1970. Longitudinal alterations in the relative statuses of the two components across metropolitan areas have primarily involved the suburban ring. Somewhat different processes of change were evident in the two time periods, particularly when metropolitan areas are distinguished by their age. In the 1920 to 1950 period, the oldest metropolitan areas evolved toward higher suburban than central city status, while newer metropolitan areas evolved toward higher central city than suburban status. In the 1950 to 1970 period, metropolitan areas generally moved toward a pattern of higher suburban than central city status, regardless of their individual characteristics such as age or period of development.The contemporary distribution of higher status residences in relationship to the center of metropolitan areas has attracted extensive research attention. The issue has relevance for social policy, because many problems of government and participation in central cities have been blamed on the alleged exodus of higher status persons , who have disproportionately contributed resources to their communities (Kasarda, 1976;Downs, 1970). The issue also is important for the development of theory on the current growth of metropolitan areas, for

The construction of Aliceville lock and dam and other related channel alterations, completed in 1979, has resulted in changes to the stage-discharge relations in the vicinity. The scarcity of current-meter measurements, coupled with backwater conditions, makes definition of a single stagedischarge relation impossible. However, limit curves can be defined that would encompass such a relation. Backwater is defined as water backed up or retarded in its course as compared with water flowing under normal or natural conditions. This results in a rise in stage above normal water level while the discharge remains unaffected. Backwater is usually caused by temporary obstruction(s) to flow downstream. Backwater at Aliceville Dam results from a variety of river conditions. Some of these conditions are large tributary inflow, return of flood plain flows to the main channel during recessions, and operations at Gainesville Dam during low flows. The discharges obtained from 26 current-meter measurements, along with computed discharges through the dam, were plotted versus stage. The plot illustrates, by the scatter of data points, the variations in backwater. Curves were drawn to envelope the extreme plot patterns showing possible ranges of several feet in stage for any given discharge. The upper end of the curves were extrapolated based on the results of a step-backwater analysis.

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