Irrigation was important in China's traditional agriculture, and some facilities existed as long as 2,000 years ago. The extension of water conservancy facilities by labor-intensive means was an important part of the agricultural development programs of the 1950s. During the Great Leap Forward, a number of water conservancy projects were undertaken, but with insufficient planning and capital. During the turmoil and bad weather of 1959-61, many water conservancy works were washed out by floods or otherwise destroyed, considerably reducing the irrigated acreage. Facilities were rebuilt in the early 1960s. By the 1980s irrigation facilities covered nearly half the cultivated land; systems installed since the late 1960s extended over a considerable part of north China, especially on the North China Plain.
In the era of post-Mao reform, irrigation and drainage systems expanded to increase the stock of stable and high-yielding land. The inventory of mechanical pumps also greatly increased; powered irrigation equipment reached almost 80 million horsepower in 1985. In this period the government began to charge fees for the water the farmers used, and farmers therefore limited the amount of water applied to their crops on a benefit cost basis. The reorganization of rural institutions weakened administrative measures necessary to make large- scale waterworks function. Lowered investment, poor maintenance, and outright damage to facilities lessened the effectiveness of the system. Adding additional acreage was likely to be increasingly costly because areas not under irrigation were remote from easily tapped water sources. In the mid-1980s government officials recognized the problems and undertook to correct them.
North China is chronically short of water and subject to frequent droughts (see Climate , ch. 2). A considerable proportion of its irrigation water comes from wells. Officials in the Ministry of Water Resources and Electric Power (and its predecessors) have periodically proposed diverting water from the Chang Jiang to irrigate the North China Plain. The enormous expense of constructing such a project has precluded its realization. Farmers have also been encouraged to use sprinkler systems, a more efficient use of scarce water resources than flood-type irrigation systems.
Data as of July 1987