13-8  Irrigation, Reservoirs, Flood Prevention, Water and Soil Conservation
Item	1990	1995	2000	2005	2009	2010
Number of Irrigated Areas at Year-end    (set)	5363	5562	5683	5860	5844	5795
33 000  Hectares and Over	72	74	101	117	125	131
20 000-33 000  Hectares	76	99	141	170	210	218
Effective Irrigated Area      (10 000 hectares)	2123.1	2249.9	2449.3	2641.9	2956.2	2941.5
33 000  Hectares and Over	604.7	631.4	788.3	1023.0	1082.8	1091.8
20 000-33 000  Hectares	189.6	244.4	344.0	408.0	474.7	474.0
Number of Reservoirs                            (unit)	83387	84775	85120	85108	87151	87873
Large Reservoir	366	387	420	470	544	552
Medium-sized Reservoir	2499	2593	2704	2934	3259	3269
Small Reservoir	80522	81795	81996	81704	83348	84052
Capacity of Reservoirs        (100 million cu.m)	4660	4797	5184	5624	7064	7162
Large Reservoir	3397	3493	3842	4197	5506	5594
Medium-sized Reservoir	690	719	746	826	921	930
Small Reservoir	573	585	594	602	636	638
Water-saving Irrigated Area (10 000 hectares)			1638.9	2133.8	2575.5	2731.4
Areas with  Flood Prevention Measures	1933.7	2006.5	2098.9	2133.9	2158.4	2169.2
(10 000 hectares)
Area of Soil Erosion under Control	5300	6690	8096	9465	10454	10680
(10 000 hectares)
Total Length of Dikes                   (10 000 km)	22.0	24.7	27.0	27.7	29.1	29.4
Area of Land Protected by Dikes	3200.0	3060.9	3960.0	4412.0	4654.7	4683.1
(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.