Recent shifts in the hydrological behavior of natural watersheds suggest acute challenges for water planning under climate change. Usually triggered by a multi-year drought, these involve tendency less annual streamflow given precipitation, and this has now been reported on multiple continents. Future drying change may induce similar unexpected responses, commentary discusses implications manag...

Emerging problems of environmental change and of long range hydrologic forecasting demand knowledge of the hydrologic cycle at global rather than catchment scale. Changes in atmosphere and/or landscape characteristics modify the earth's metabolism through changes in its biogeochemical cycles. The most basic of these is the water cycle which directly affects the global circulation of both atmosp...

secure analyses of every dump site and all details and all combinations over time. When the biochemists and the analytical chemists complete their work, we would then call in the hydrologists to provide patterns for us. That will be an ideal world. But I am reminded, for example, that Japanese clinicians knew something was wrong at Minamata Bay long before we were able to measure methylmercury,...

Karstand cave-systems are complex, 3-dimensional phenomena. Mapping and visualizing them represents a challenge to cartographers, morphologists and computer-graphics-specialists. Surveying and sketching of cave-maps as well as the construction of 3D-cave-models (incl. geology) are important parts of cave exploration and research. Besides supporting the efforts of speleologists, cave maps and 3D...

GRANT W. PETTY Earth and Atmospheric Sciences Department, 1397 CTVL Bldg, Purdue University, West Lafayette, Indiana 47907-1397, USA W1TOLD F. KRAJEWSKI Department of Civil and Environmental Engineering, The University of Iowa, Iowa City, Iowa 52242-1585, USA Abstract The availability of satellite-derived rainfall products to hydrologists and other natural scientists has increased enormously in...

Lumped parameter hydrologic models are frequently used for operational streamflow forecasting in the United States. With the deployment of the Weather Surveillance Radar 1988 Doppler (WSR88D), many hydrologists will use radar-rainfall data as input to these models. WSR-88D precipitation products can be used in a variety of ways (Shedd and Fulton, 1993; Lindsey, 1993). In this paper, we examine ...

In the Midwest, signi cant interannual to decadal variations in precipitation and stream ow have been observed over the latter part of this century. Yet in studies of precipitation frequency, engineers and hydrologists assume that natural climate variability does not a ect the probability distribution of extreme precipitation. A regional approach is used to test this assumption for extreme prec...

Abstract. River stream-flow is well-thought-out as an essential element in the hydrology studies, especially for reservoir management. Forecasting river stream-flow is the key for the hydrologists in 10 proposing certain short or long-term planning and management for water resources system. In fact, developing stream-flow forecasting models are generally categorized into two main classes; proce...

Hydrological models are a popular tool for simulating catchment processes in response to a rainfall event. The wide range of available models means that hydrologists are faced with the problem of determining which model is best applied to a catchment in any modeling exercise. An attractive alternative to selecting a single hydrological model is to combine the results from several models, thereb...