The Future of Arid Land Agriculture: The Aral Sea Basin of Central Asia and the San Joaquin-Tulare Basin of CA. Waterscape International Group.

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Presentation transcript:

The Future of Arid Land Agriculture: The Aral Sea Basin of Central Asia and the San Joaquin-Tulare Basin of CA. Waterscape International Group

Purpose-Why Look at the Aral? Compare the Aral Sea Basin to Tulare Basin Learn a bit about arid land, irrigated agriculture Provide California with a “window into the future” Informational presentation

Conversions 1 sq. km = 100 hectares 1 hectare = 2.5 acres 1 sq. mile = 640 acres = 259 hectares 1 acre-foot = 1230 cubic meters 1 cubic km = 813,000 acre-feet

Features of SJ & Tulare Basins Southern Half of the Central Valley 84,000 sq km Sacramento to Bakersfield Sierras, Coast Ranges, Tehachapi, Delta Silicate-rich Sierran Sands, Coast Range Alluvium Flood Basin Deposits

Map of SJ Tulare Basins

Close-up View

Features of Aral Sea Basin 3,995,900 thousand sq.km. (all of Central Asia) 53,017 thousand people

Map of Aral Sea Basin

Aral Sea Basin-Population

Land/Water Use in the SJTB 5-7 million irrigated acres (2- 3 million hectares) Diverse range of agricultural activities, grazing Liberal pesticide/fertilizer application Water Usage groundwater: 7 million acre-feet Recharge = 5 million acre feet Surface Water Usage (8 million acre-feet) 70% for agriculture

Land/Water Use in Aral Total Mean Surface Water Flow = 116 cubic km (60 into Aral Sea) Annual Usage >95% Groundwater Reserves ~31 cubic km Annual Usage = 10 cubic km Cotton & Grain 75% Irrigated lands have doubled ( million hectares). Total Cultivated 10 million hectares Agriculture in the region dates back to the 6th-7th centuries B.C

SJ Tulare Basin-Land Cover

SJ Tulare Basin - DEM

Aral Sea Basin-Land Cover

Drainage Irrigation Type of agriculture One big evaporation dish Irrigation (>90% furrow irrigation) Drainage (Aral Sea Basin installed drainage late) What to do with the drainage?

Irrigation Canals

Impact of Arid Land Agriculture Salinization Trace Elements Pesticides Nutrients Reduced Runoff

Effect on SJ Tulare Basin NAWQA facts Decline in Ag. Productivity Drinking water (ground and surface) quality and availability declines In-stream use impact

Effect on Aral Sea Basin Decline in agricultural productivity (salinization and trace elements) Decline in drinking water quality (pesticides, fertilizers, salt) Air quality Decline in drinking water quantity (diversions, pumpage) Reduction in the sea dimensions Increase in evaporation and drainage-collecting water, water salinity considerably increased from 9.94 g/litre in 1965, to about 15 g/litre in 1996

Effect on Aral Sea Basin (cont.) Salinized Land in Uzbekistan 1982: 12,000 sq. km 1985: 16,430 sq. km Inflow to Aral Sea Historic: 56 cub km : 47 cub km : 2 cub km

Year Total Fish Catch from Maly Aral Metric Tons All 24 species of native fish have died off.

Aral Sea Surface Area Change

Abandoned Fishing Boats

Public Health Dimension Study of 700,000 women in Karakalpakstan 97% anemic (manganese and zinc) Kidney and Liver Disease

What’s being done? SJTB CVPIA, CALFED 303 (d) CWA Listings TMDLs DWSAP Program CAA Suit Aral Sea Basin World Bank Funding is a large issue

The Upshot Exploiting agricultural productivity over a very shot period of time. Permanently impairing your groundwater and surface water as a drinking water source Permanently devegetating the landscape Negatively influencing public health through air, soil, and water quality Destroying fisheries and natural habitat

Enough, In-time? Stop drainage, gw contamination? Regrowth of natural vegetative cover? Bare soil evaporation. What can be done? Line canals, better drainage, etc?

Lessons Learned How has this happened? Why? Can the problems of the Aral Sea Basin manifest themselves in California? How can the course be altered today? How can this course be prevented in the future?

References National report: "On the environment state and use of natural resources in the Republic of Uzbekistan". State Committee on Nature protection of Uzbekistan. Tashkent, K.Isentaev. "Geological structure and perspectives of oil and gas reserves of the Aral Sea". Workshop report. Almaty, Ministerial conference of the Central Asia. "Assessment of the environment". Aarhus, Denmark, J.Mahambetova. "Non-government union "Aral tenizi". Aralsk, 1999.