The construction principle of geomantic pen is to choose suitable terrain, seize the season, delimit the position, dredge the excavation and inject water for irrigation. Pay attention to the depth and width of ditches during construction, and adjust the irrigation flow according to the terrain and seasonal changes. In addition, the quality of irrigation water, the smoothness of water flow, slope and permeability are also problems that need to be paid attention to in the construction process. If the construction is improper, it may cause problems such as land subsidence and water flow backward, which will seriously affect agricultural production.
With the continuous improvement of modern science and technology and industrialization, people's requirements for agricultural production are getting higher and higher. In the field of agricultural irrigation, although the traditional geomantic pen still has certain application value, its efficiency and flexibility can no longer meet the needs of modern production. Therefore, modern agricultural irrigation is realized by intelligent water conservancy equipment and advanced hydrological technology. These devices can not only improve the precision and efficiency of irrigation, but also reduce the adverse effects such as land subsidence and backward flow, and better promote the sustainable development of agriculture.