洛阳市多年平均降雨量600～950mm,由南向北递减,干旱为最主要自然灾害。因历史上旱灾频繁发生,且持续时间长,素称十年九旱。按1980年水资源评价成果,全市多年平均地表水资源量为26.60亿m~3,地下水多年平均水资源量12.63亿m~3,扣除两者之间重复计算量11.18亿m~3,多年平均水资源量为28.05亿m~3,人均占有水资源量约468m~3,不足全国人均水资源量的1/5。地下水资源则更为匮乏,不足地表水资源量的1/2。 Luoyang City, the average annual rainfall 600 ~ 950mm, decreasing from south to north, drought is the most important natural disaster. Due to the frequent occurrence of drought in history and long duration, it is said to have nine drought in ten years. According to the evaluation results of water resources in 1980, the average surface water resources of the whole city are 2.66 billion m 3 for many years, and the average annual water resources for groundwater are 1.263 billion m 3, deducting the repeated calculation amount of 1.1118 billion m 3 between the two, The amount of water resources is 2.805 billion m 3, and the per capita water resources is about 468 m 3, less than 1/5 of the national per capita water resources. Groundwater resources are more scarce, less than 1/2 of surface water resources.