Low flows and hydrologic droughts
Streamflow fluctuates in time in response to the annual cycles of precipitation and temperature and to random deviations from these cycles. The resulting lowest flow for each year, usually an average for some number of consecutive days, is designated as an annual low flow. That flow usually occurs during a period of no precipitation and is derived from ground-water discharge or surface storage being discharged from lakes, marshes, or melting glaciers.
Figures & Tables
Surface Water Hydrology
Provides reviews of all major facets of hydrology. Topics covered include: influences of the atmosphere and of land and vegetation on stream flow; temporal and spatial variability of stream flow, with separate chapters on floods and on low flow and hydrologic drought; snow and ice, the frozen components of the hydrosphere; the hydrology of lakes and wetlands; hydrogeochemistry of rivers and lakes; the aquatic biota; sediment movement and storage; the riverscape for selected North American rivers; and the influence of Man on hydrologic systems. Accompanying color plates show histograms of river water chemistry, runoff and flow regimes, and the distribution of precipitation minus evaporation for North America.