12-9    Irrigation, Reservoirs, Flood Prevention, Water
and Soil Conservation and Improvement of Saline-Alkaline Land
Item
	1985	1990	1995	2000	2001
Number of Irrigation Areas    (year-end)	5281	5363	5562	5683	5686
33 000  Hectares and Over	71	72	74	101	108
20 000-33 000  Hectares	66	76	99	141	169
Effective Irrigated Areas (10 000 hectares)	2077.7	2123.1	2249.9	2449.3	2476.6
33 000  Hectares and Over	599.6	604.7	631.4	788.3	861.7
20 000-33 000  Hectares	167	189.6	244.4	344	405.4
Number of Reservoirs	83219	83387	84775	85120	85136
Large	340	366	387	420	433
Medium-sized	2401	2499	2593	2704	2736
Small	80478	80522	81795	81996	81967
Capacity of Reservoirs (100 million cu.m)	4301	4660	4797	5184	5281
Large	3076	3397	3493	3842	3927
Medium-sized	661	690	719	746	758
Small	564	573	585	594	595
Water-saving Irrigated Areas (10 000 hectares)				1638.9	1744.63
Flooded or Waterlogged Area	1858.4	1933.7	2006.5	2098.9	2102.1
Area of Soil Erosion under Control	4640	5300	6690	8096	8154
(10 000 hectares)
Improved Area of Saline-Alkaline Land	456.9	499.5	543.4	584.1	575.05
(10 000 hectares)
Total Length of Dikes       (10 000 km)	17.7	22.0	24.7	27.0	27.3
Area of Land Protected by Dikes	3106	3200	3060.9	3960	4067.1
(10 000 hectares)
a) The capacity of the large reservoirs is over 100 million cubic meters, while that of the medium ones is from 10 million to 100 million cubic meters,
and that of the small ones is from 100 000 to 10 million cubic meters.