EarthTrends (http://earthtrends.wri.org) Searchable Database Results Provided by the World Resources Institute (http://www.wri.org) "Water Resources and Freshwater Ecosystems -- Internal Renewable Water Resources (IRWR): Overlap" "Units: Cubic kilometers (km^3)" ,,1960-2007, World "World {1}","",9928.0, ,,1960-2007, Region/Classification "Asia (excluding Middle East)","",2138.2, "Central America & Caribbean","",236.6, "Europe","",986.7, "Middle East & North Africa","",58.9, "North America","",1522.0, "Oceania","",20.0, "South America","",3644.6, "Sub-Saharan Africa","",1321.0, "Developed Countries","",2604.7, "Developing Countries","",7341.3, "High Income Countries","",1968.7, "Low Income Countries","",1965.3, "Middle Income Countries","",5994.0, ,,1960-2007, Country "Albania","ALB",2.4, "Algeria","DZA",0.0, "Angola","AGO",55.0, "Argentina","ARG",128.0, "Armenia","ARM",1.4, "Australia","AUS",20.0, "Austria","AUT",6.0, "Azerbaijan","AZE",4.4, "Bahrain","BHR",0.0, "Bangladesh","BGD",0.0, "Barbados","BRB",0.0, "Belarus","BLR",18.0, "Belgium","BEL",0.9, "Belgium/Luxembourg","",1.0, "Benin","BEN",1.5, "Bolivia","BOL",103.9, "Botswana","BWA",0.1, "Brazil","BRA",1874.0, "Bulgaria","BGR",5.5, "Burkina Faso","BFA",5.0, "Burundi","BDI",7.5, "Cambodia","KHM",13.0, "Cameroon","CMR",95.0, "Canada","CAN",360.0, "Cape Verde","CPV",0.0, "Côte d'Ivoire","CIV",35.0, "Central African Rep","CAF",56.0, "Chad","TCD",10.0, "Chile","CHL",140.0, "China","CHN",727.9, "Colombia","COL",510.0, "Comoros","COM",0.0, "Congo","COG",120.0, "Congo, Dem Rep","COD",420.0, "Croatia","HRV",0.5, "Cyprus","CYP",0.2, "Czech Rep","CZE",1.4, "Denmark","DNK",2.0, "Djibouti","DJI",0.0, "Dominican Rep","DOM",11.7, "Ecuador","ECU",134.0, "Egypt","EGY",0.0, "El Salvador","SLV",6.0, "Equatorial Guinea","GNQ",9.0, "Eritrea","ERI",0.4, "Estonia","EST",3.0, "Ethiopia","ETH",18.0, "Finland","FIN",2.0, "France","FRA",98.0, "Gabon","GAB",60.0, "Gambia","GMB",0.5, "Gaza Strip","",0.0, "Georgia","GEO",16.0, "Germany","DEU",45.0, "Ghana","GHA",25.0, "Greece","GRC",7.8, "Guatemala","GTM",25.2, "Guinea","GIN",38.0, "Guinea-Bissau","GNB",10.0, "Guyana","GUY",103.0, "Honduras","HND",30.0, "Hungary","HUN",6.0, "Iceland","ISL",20.0, "India","IND",380.0, "Indonesia","IDN",410.0, "Iran, Islamic Rep","IRN",18.1, "Iraq","IRQ",0.0, "Ireland","IRL",10.0, "Israel","ISR",0.0, "Italy","ITA",31.0, "Jamaica","JAM",0.0, "Japan","JPN",17.0, "Jordan","JOR",0.2, "Kazakhstan","KAZ",0.0, "Kenya","KEN",3.0, "Korea, Dem People's Rep","PRK",12.0, "Korea, Rep","KOR",10.7, "Kuwait","KWT",0.0, "Kyrgyzstan","KGZ",11.2, "Lao People's Dem Rep","LAO",37.9, "Latvia","LVA",2.0, "Lebanon","LBN",2.5, "Lesotho","LSO",0.5, "Liberia","LBR",45.0, "Libyan Arab Jamahiriya","LBY",0.1, "Lithuania","LTU",1.0, "Luxembourg","LUX",0.1, "Madagascar","MDG",50.0, "Malawi","MWI",2.5, "Malaysia","MYS",50.0, "Maldives","MDV",0.0, "Mali","MLI",10.0, "Malta","MLT",0.0, "Mauritania","MRT",0.0, "Mauritius","MUS",0.5, "Mexico","MEX",91.0, "Moldova, Rep","MDA",0.4, "Mongolia","MNG",4.0, "Morocco","MAR",3.0, "Mozambique","MOZ",14.0, "Myanmar","MMR",150.0, "Namibia","NAM",0.0, "Nepal","NPL",20.0, "Netherlands","NLD",4.5, "Nicaragua","NIC",55.0, "Niger","NER",0.0, "Nigeria","NGA",80.0, "Norway","NOR",90.0, "Oman","OMN",0.9, "Pakistan","PAK",50.0, "Panama","PAN",17.7, "Paraguay","PRY",41.0, "Peru","PER",303.0, "Philippines","PHL",145.0, "Poland","POL",12.0, "Portugal","PRT",4.0, "Qatar","QAT",0.0, "Réunion","REU",2.3, "Romania","ROU",8.0, "Russian Federation","RUS",512.0, "Rwanda","RWA",7.0, "Saint Kitts and Nevis","KNA",0.0, "Saudi Arabia","SAU",2.0, "Senegal","SEN",1.5, "Serbia and Montenegro","YUG",1.4, "Sierra Leone","SLE",15.0, "Slovakia","SVK",1.7, "Slovenia","SVN",13.4, "Somalia","SOM",3.0, "South Africa","ZAF",3.0, "Spain","ESP",28.2, "Sri Lanka","LKA",7.0, "Sudan","SDN",5.0, "Suriname","SUR",80.0, "Swaziland","SWZ",0.7, "Sweden","SWE",19.0, "Switzerland","CHE",2.5, "Syrian Arab Rep","SYR",2.0, "Tajikistan","TJK",3.0, "Tanzania","TZA",26.0, "Thailand","THA",30.7, "Togo","TGO",5.0, "Tunisia","TUN",0.4, "Turkey","TUR",28.0, "Turkmenistan","TKM",0.0, "Uganda","UGA",29.0, "Ukraine","UKR",17.0, "United Arab Emirates","ARE",0.1, "United Kingdom","GBR",9.0, "United States","USA",1162.0, "Uruguay","URY",23.0, "Uzbekistan","UZB",2.0, "Venezuela","VEN",204.7, "Viet Nam","VNM",35.0, "Yemen","YEM",1.4, "Zambia","ZMB",47.0, "Zimbabwe","ZWE",5.0, Footnotes "1 -- World" "Value was calculated by WRI" Source "Food and Agriculture Organization of the United Nations (FAO) Land and Water Development Division. 2007. AQUASTAT Information System on Water and Agriculture: Online database. Rome: FAO. Available on-line at http://www.fao.org/nr/water/aquastat/data/query/index.html." Technical Notes "Definition:" "Overlap is the volume of water accounted for in both surface water and groundwater estimates. It is used in conjunction with estimates of surface and groundwater flow to calculate internal renewable water resources (IRWR) without double counting." "" "Total IRWR = Surface Water Produced Internally + Groundwater Recharge - Overlap." "" "Years Covered and Frequency of Update:" "Water resources data are typically not available in a time series. Data were collected over a period of 15 to 25 years and have been compiled since 2003 by the AQUASTAT global information system of water and agriculture. The current AQUASTAT database provides data per 5-year period if available. Data are presented by WRI as a single value for 1960-2005 because, for this variable, AQUASTAT lists only one number for each country over the entire time period covered by the database." "" "AQUASTAT updates their website as new data become available, or when FAO conducts special regional studies." "" "Methodology:" "Two types of exchanges between surface and groundwater create overlap: contribution of aquifers to surface flow, and recharge of aquifers by surface runoff. Aquifers contribute to surface flows in humid temperate or tropical regions, and, in regions called karstic domains (containing a porous karst limestone rock matrix). Overlap in humid areas is equal to the base flow of rivers, since this flow is assumed to be equivalent to groundwater recharge. In karstic domains, a portion of groundwater resources contribute to surface water flow and are thus counted as overlap. In arid and semi-arid countries, all groundwater flow is typically considered to be overlap, since groundwater recharge is a result of infiltration from surface water flows." "" "AQUASTAT collects its information from a number of sources--national water resources and irrigation master plans; national yearbooks, statistics and reports; reports from FAO; international surveys; and, results from surveys made by national or international research centers. In most cases, a critical analysis of the information was necessary to ensure consistency between the different data collected for a given country." "" "For more information, please refer to the following publication: Food and Agriculture Organization of the United Nations (FAO), Water Resources, Development and Management Service. 2003. AQUASTAT Information System on Water and Agriculture: Review of World Water Resources by Country. Available on-line at http://www.fao.org/waicent/faoinfo/agricult/agl/aglw/aquastat/water_res/index.htm. Rome: FAO." "" "Data Reliability:" "While AQUASTAT represents the most complete and careful compilation of water resources statistics to date, freshwater data are generally of poor quality. Information sources are various but rarely complete. Access to information on water resources is still sometimes restricted for reasons related to sensitivity at the regional level. The accuracy and reliability of the information vary greatly among regions, countries, and categories of information, as does the year in which the information was gathered. As a result, no consistency can be ensured at the regional level on the duration and dates of the period of reference." "" "For more information, please refer to the original data source or to the 2003 print publication Review of World Water Resources by Country in FAO's AQUASTAT Programme."