In addition to cement, Liu An also had to consider the production of waterwheels.

This is because the smaller the evaporation and seepage area of the reservoir, the more water can be retained.

In this way, the reservoir will inevitably be very deep, and it will be more difficult to get water by manpower, and it will be much more convenient and labor-saving with a waterwheel.

Moreover, because the reservoir is stagnant water, it cannot be made into a hydraulic windmill that needs flowing water to provide hydraulic rotation, and the efficiency of manual rotation is too low, so it can only be made to operate by animal power

"The Three Kingdoms Start from Obtaining the First Mu of Field" Chapter 142 Zhuojun Taishou is in the middle of the hand, please wait for a while,

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