灌溉设计保证率的英文：
ensurance probability of irrigation water

ensurance是什么意思：
n.保证

No system that ensured spiritual progress.
没有确保精神进化的系统。

Ensure the effectiveness and identification of document.
确保文件的有效性,并得到明显的识别。

Please rest assured that repayment is ensured.
请您放心，还款是有保障的。

probability是什么意思：
n. 可能性，或然率；几率

thing that is(most)probable;probable event or result
（很）可能有的事物; 可能发生的事;可能出现的结果

They'll probably have a few in by this time.
到这个时候他们多半会喝上几杯。

the probability of a specified outcome.
有产生特定结果的可能。

irrigation是什么意思：
n. 灌溉；冲洗（法）

The rotary agitator irrigated him.
旋转的鼓动者可灌溉的他。

The farmer is irrigating in his field.
那个农夫正在田里灌溉。

The terrace channels are convenient for irrigation.
梯田的沟渠便于灌溉。