The proportion of reducing flood under check dams effect in total reducing amount of watershed comprehensive management are respectively 80 8%, 67 7% and 54 2%, reducing sediment respectively 83 5%, 58 5% and 66 4%.
According to the statistic analysis of field data of runoff and sediment in north west Shanxi province in the middle Yellow River region, compared with those before 1969,the annual rainfall from 1970 to 1996 is decreased by 8.1% and corresponding annual average flood discharge decreased by 28 293 million m 3 in which 49 6 % is influenced by watershed comprehensive management and 50 4% by rainfall;
The sustainable development in the watershed has been seriously influenced. So that the Chinese government begin to harness the Tarim River by engineering and non-engineering measures recently, in order to enhance the integrated management of water resources and to improve the management level.
On the basis of comprehensive analysis on present achievements of water reduction function and environment conservation regionalization of upper and middle reaches of Yellow River, adopting method of integrated management of small watershed, water reduction norms of soil and water conservation of regions are calculated, which are 245.5? m~3/hm~2 in loess hilly region, 118.5? m~3/hm~2 in loess plateau and hilly region and 471.9?
Because dural fistulas may present with a variety of neurologic and ophthalmologic problems, a team of neurologists, neuro-ophthalmologists, neuroradiologists, and neurosurgeons should develop a comprehensive treatment plan.
These approaches help therational regulation and utilization of the local water resourcesfor comprehensive control of drought, waterlogging and salinity.
The implemented system can be used for evaluating individual and comprehensive management strategies based on the results of crop growth simulation under various environments and different genotypes.
The study identified the need for a comprehensive management plan that merges traditional measures, including size limits and gear restrictions, with precautionary management tools.
Hence, the need for a new integrated management approach is increasingly emphasised in international instruments as well as in the opinions of writers.