000			02639nam a22003977a 4500
001			G73487
003			MX-TxCIM
005			20211006081713.0
008			121211s ||||f| 0 p|p||0|| |
020			_a 92-9090-354-6
040			_aMX-TxCIM
082	0	4	_a1998-058382
100	1		_aSeckler, D.
245	0	0	_aWorld water demand and supply, 1990 to 2025: _b scenarios and issues
260			_c1998
340			_aPrinted
500			_a18 tables, 4 fig., 1 map, 32 ref.; IIMI research report 19 IIMI, POB 2075 Colombo - Sri Lanka. E-mail: r.desilva@cgnet.com
520			_aIt is widely recognized that many countries are entering an era of severe water shortage. IIMI has a long-term research program to determine the extent and depth of this problem, its consequences to individual countries, and what can be done about it. This study is the first step in that program. As the study progressed there were increasingly severe data problems and conceptual and methodological issues in this field. Therefore a simulation model was created that is based on a conceptual and methodological structure that is believed valid and on various estimates and assumptions about key parameters when data are either missing or subject to a high degree of error and misinterpretation. Part 1 of the report describes the water balance approach which provides the conceptual framework for this study. The water balance framework is used to derive estimates of water supply and demand for countries. These estmates are adjusted to take explicit account of return flows and water recycling whose importance is often neglected in studies of water scarcity. Part II presents the data for the spreadsheet model of water supply and demand for 118 countries that include 93 percent of the world's 1990 population. Following a discussion of the 1990 data, two scenarios of world water supply and demand are presented. Part III presents two basic criteria of water scarcity that together comprise the overall IIMI indicator of water scarcity for countries
546			_aEnglish
595			_aAC
650	1	7	_aCereals _gAGROVOC _2 _91036
650	1	0	_aCultural methods
650	1	0	_aEnvironmental factors
650	1	7	_aIrrigation _gAGROVOC _2 _91164
650	1	0	_aIrrigation methods
650	1	0	_aPhysiographic features
650	1	0	_aPhysiological requirements
650	1	0	_aPlant products
650	1	0	_aWater resources and management
700	1		_aAmarasinghe, U., _ecoaut.
700	1		_aBarker, R., _ecoaut.
700	1		_ade Silva, R., _ecoaut.
700	1		_aMolden, D., _ecoaut.
773	0		_tColombo (Sri Lanka). IIMI. 1998. 49 p
942			_cBK
999			_c44278 _d44278