Temporal and spatial analyses of irrigation management at county level irrigation areas in China's Huang-Huai-Hai Plain

The building and management of irrigation area are characterized by public welfare, workability, monopoly, policy, discipline synthesis, and so on. These characteristics urge the management of agriculture irrigation to make special request, especially in groundwater irrigation of the plain, thus the authors bring forward nine indexes and adopts the principle of the factor analysis to build up the comprehensive index for evaluating the irrigation management level of the Huang-Huai-Hai Plain, aiming at irrigation area's properties and the condition of agriculture. And the irrigation management level of county level administrative region by taking Quzhou county as a case was studied. The results show that the indexes and the ways of evaluation are good, because they obey the normal distribution, and are maneuverable and practical. The irrigation management levels of ten towns in Quzhou County were greatly increased from 1980 to 2000. The Quzhou town management measure is more efficient than those of other villages and towns. At last, considering the trait of corresponding region, the authors analyzed the driving force of change of irrigation management levels, put forward the suggestion, and offered good instructions to raise efficiency and to conserve water resources.