平均水头

推导了计算公式，提出用标准耗水率指标考核水电厂经济运行，用平均水头指标考核水库经济运行的具体办法。水平指数：术前166，术后157。

Besides that it has derived the calculating formula , putting forward some specific methods such as assessing the economical operation of hydraulic power plant by standard water consumption rate index , and assessing the economical operation of reservoirs by average head index .

2000年实施的《水电工程水利计算规范》明确指出：依据水库调度图按平均水头计算的电量可能与实际差别较大。

The " Specifications of Water Conservancy Computation for Hydroelectric Projects " clearly states that a large difference might exist between the amount of electric power calculated according to the mean water head on the reservoir dispatching curve and its real value .

为此以平均水头和标准耗水率分别对电网水库调度与水电厂进行考核，可以分清各自的作用，有利于促进水电厂的经济运行，但电网调度必须实行调厂不调机的方式。

The reservoir dispatching and hydropower station operation in the power network are checked separately by the average water head and the standard water consumption rate to find out their respective actions in order to promote the economic operation of hydropower station .

在田间滴灌管网常见的布置情况下，如灌水器间距、灌水器类型、毛管管径、毛管长度等在各种可能的变动范围内，模拟毛管上平均压力水头所在位置的范围。

Average pressure position of drip line is determined by programming on conditions that the distance of emitter , the styles of emitter the diameter of drip line and the length of drip line vary within probable range .