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密云水库1994年高水位运行，这是分析研究副坝渗流的极好机会。对5座副坝渗流分析结果：主要渗流途径是坝头、坝基岩石，坝体浸润线是由两岸山头及观基岩石绕渗形成。说明人工填筑壤土斜墙的防渗效果较未经灌浆处理的天然岩体为好。5座副观都建在透水性较小的风化或半风化片麻岩上，在高水位作用下，坝脚虽有地表渗水，但渗量不大，不会危及坝体安全。从20多年观测资料对比看，5座副坝在渗流方面无恶化趋势。
Miyun Reservoir high water level operation in 1994, which is an excellent opportunity to analyze the secondary dam seepage. The results of seepage analysis of the five auxiliary dam are as follows: The main seepage flow path is the head of dam, the dam foundation rock and the dam infiltration line formed by the seepage of rocks and rocks on both sides of the bank. It shows that the anti-seepage effect of the inclined wall with artificial soil is better than the natural rock without grouting treatment. The 5 views are built on less permeable weathered or semi-weathered gneiss, under the action of high water level, although dam surface seepage, but the infiltration is not large, will not endanger the safety of the dam. Comparing the data from more than 20 years of observation, there is no deterioration tendency of the five auxiliary dams in the seepage.