Surface water mainly from precipitation and off the water, precipitation, rainfall in the main flood season, water comes mainly from the old passenger Shahe, Song eight Tuan, sand east of the trunk.

地表水主要来源于降水及客水，降水以汛期降雨为主，客水主要来源于老沙河、宋八疃、沙东干渠。

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The paper analyzes the serious conditions of flood calamity in Qinghai Province. To counter to the main season of flood calamity, it puts forward the various prevention countermeasure.

本文对青海省洪涝灾害的严重情况作了分析，针对产生洪涝灾害的主要原因，提出各项防治对策。

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The main characteristic of trophic level of each watershed is: The degree of eutrophication is more serious in flood season than in dry reason, in upstream than in downstream along the watershed.

各流域富营养化主要特征是：丰水期比枯水期严重，从上游到下游逐渐加重。

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