Geoscience Reference
In-Depth Information
Table 8.1
(continued)
Mean flow
+
(m
3
/s)
River
Reference
Reconstruction
period
Hydrologic change
Salt, Arizona
Smith and Stockton (1981)
∗
25
1580-1979
Frequency of high flows relatively high in twentieth century. Most
severe sustained periods of low flow before twentieth century.
Gila, Arizona
Meko and Graybill (1995)
13
1663-1985
Clustering of high-flow years in early twentieth century. Drought in
1950s most severe on record.
White, Arkansas
Cleaveland (2000)
842
1023-1985
Twentieth century has more extreme low-flow and a larger number of
high-flow years than prior centuries, perhaps due to human
activities.
Potomac, Maryland
Cook and Jacoby (1983)
271
1730-1977
Severity of 1960s multiyear low-flow period has not been exceeded in
248 years. 1850-1873 longest period of below median flow.
∗
More than one river was reconstructed in this study, but only one reconstruction is featured in this table.
+
Mean annual observed flows, intended to show
order-of-magnitude differences in basins studied; means either taken directly from the publication listed or computed from online sources (gaged or natural
flow) using all available years.
