13-8 Irrigation, Reservoirs, Flood Prevention, Water and Soil Conservation
Item	1990	1995	2000	2005	2008	2009
Number of Irrigated Areas at Year-end    (set)	5363	5562	5683	5860	6414	5844
33 000  Hectares and Over	72	74	101	117	149	125
20 000-33 000  Hectares	76	99	141	170	298	210
Effective Irrigated Area      (10 000 hectares)	2123.1	2249.9	2449.3	2641.9	2944.0	2956.2
33 000  Hectares and Over	604.7	631.4	788.3	1023.0	1120.7	1082.8
20 000-33 000  Hectares	189.6	244.4	344.0	408.0	551.7	474.7
Number of Reservoirs                            (unit)	83387	84775	85120	85108	86353	87151
Large Reservoir	366	387	420	470	529	544
Medium-sized Reservoir	2499	2593	2704	2934	3181	3259
Small Reservoir	80522	81795	81996	81704	82643	83348
Capacity of Reservoirs        (100 million cu.m)	4660	4797	5184	5624	6924	7064
Large Reservoir	3397	3493	3842	4197	5386	5506
Medium-sized Reservoir	690	719	746	826	910	921
Small Reservoir	573	585	594	602	628	636
Water-saving Irrigated Area (10 000 hectares)			1638.9	2133.8	2443.6	2575.5
Areas with  Flood Prevention Measures	1933.7	2006.5	2098.9	2133.9	2142.5	2158.4
(10 000 hectares)
Area of Soil Erosion under Control	5300	6690	8096	9465	10159	10454
(10 000 hectares)
Total Length of Dikes                   (10 000 km)	22.0	24.7	27.0	27.7	28.7	29.1
Area of Land Protected by Dikes	3200.0	3060.9	3960.0	4412.0	4571.2	4654.7
(10 000 hectares)
a) The capacity of the large-scale reservoir is over 100 million cubic meters, while that of the medium-scale one is from 10 to 100 million cubic meters,
and that of the small-scale one is from 100 000 to 10 million cubic meters.