Reginald W. Herschy – författare

‘Too little water or too much’? In either case streamflow measurement is crucial. Climate change could significant affect water resources and flood management. Streamflow measurement is necessary for efficient water management.This third edition deals with all the main current methods for measuring the flow in rivers and open channels, in accordance with ISO and CEN standards and to satisfy the current requirements of the International Organization for Standardization and the European Union’s Water Directive. A new chapter on the Acoustic Doppler Current Profiler (ADCP) is included; the chapter on uncertainties has been redrafted in accordance with the recent International Standard on uncertainties in measurement (GUM); the chapters on the Stage-Fall-Discharge method and Hydrometric Data Processing have also been updated; and a new section on flood flows has been added.

As the world's human population continues to grow, intense pressure is being exerted on fresh-water resources. The lack of adequate clean water is seen as one of the most serious global problems for the 21st century. Human health and the health of supporting ecosystems will therefore increasingly depend on our ability to find, control and manage water. This encyclopedia should be a useful reference for all hydrologists, hydrogeologists and water engineers worldwide, whether they are concerned with the exploitation of new sources of water, the protection and management of existing reserves, or the science of surface water and groundwater flow. Over 130 scientists from over 21 countries worldwide have contributed to this volume.Illustrated throughout, it includes over 300 entries on a range of key topics, including: arid and semi-arid zones; climates and climate change; floods and droughts; desertification; entropy; flow measurement; groundwater; hydrological cycle; hydrological models; infiltration; karst hydrology; paleohydrology; precipation; remote sensing; river pollution prevention; rivers, lakes and seas; satellite hydrology; soil erosion; water treatment; water use; weather radar; and world water balance.

‘Too little water or too much’? In either case streamflow measurement is crucial. Climate change could significant affect water resources and flood management. Streamflow measurement is necessary for efficient water management.This third edition deals with all the main current methods for measuring the flow in rivers and open channels, in accordance with ISO and CEN standards and to satisfy the current requirements of the International Organization for Standardization and the European Union’s Water Directive. A new chapter on the Acoustic Doppler Current Profiler (ADCP) is included; the chapter on uncertainties has been redrafted in accordance with the recent International Standard on uncertainties in measurement (GUM); the chapters on the Stage-Fall-Discharge method and Hydrometric Data Processing have also been updated; and a new section on flood flows has been added.

Hydrometry is concerned with the measurements of all the variables in the hydrological (water) cycle and hydrological information is therefore necessary for the practice of efficient water management. Water will be a major issue as the world enters the third millennium where more than one quarter of its population still do not have safe drinking water. An increasing demand is therefore placed on hydrometry to provide the essential hydrometric information in order that the world's water resources may be managed more efficiently. The aim of this second edition is to continue the success of the first edition by including new chapters on weather radar, remote sensing, groundwater and tree ring analysis, important in extending hydrometric records. Chapters of the first edition have been brought up to date as necessary in accordance with new technology and care has been taken to bridge the gap between past methods in hydrometry. The book therefore provides an invaluable guide to managers as well as field personnel who have operation and decision making roles in water management. Contents: Flow measurement; Instrumentation; Long river records; Precipitation measuring radar; Satellite remote sensing; Groundwater; Tree ring analysis; Transmission of hydrometric data by satellite; Maximizing the utility of river flow data; Hydrometric data processing; Uncertainties and Measuring up to water resources assessment.