At last, taking eight rivers located in the east part of Shandong Province as an example, the re-estimated precipitation resources and surface water resources were given.

对山东省胶东地区部分主要河流年降水量和年径流量序列进行了分析，重新评价了该地区的降水资源及地表水资源。

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Prediction accuracy of precipitation has an important influence on evaluation of groundwater resources that is recharged directly or indirectly by the precipitation.

降水量的预报精度对以其为直接或间接补给源的地下水资源评价具有重要的影响。

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Rainfall is the main source of water resources in any region, studying the evolvement characteristic of the precipitation is of great importance for forecasting and simulating hydrology system.

降雨是地区水资源的主要来源，研究其长期的演变特性，对于水文水资源系统的预报、模拟具有十分重要的意义。

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Well as far as the U.S. is concerned, a March 2006 NOAA study published in the Journal of the American Water Resources Association reports that conditions during the twentieth century have become wetter (more precipitation), but less extreme in terms of severe flood-producing hydrological (rain storm) occurrences.

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