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1945年天水水土保持试验站,开始测定3°～27°左右坡面的水土流失.由于当时缺乏经验和足够的资料,在测定100平方米(5×20)的隔离地块所设计的水泥积水池容量为3.3立米(高1.6米直径1.6米).之后到1954年新建的试验区内积水池稍为增加,可容水4.1立米(高1.5米直径1.8米).目前陕北缓德水土保持科学试验站和甘肃西峰镇水土保持科学试验站所采用的水土流失积水池都仿照此式做成.加大积水池对于防止溢流起着极为重要的作用,但若逢到象1947年8月11～13日在天水1次连续降雨48小时,数量达155毫米的情况下,这种积水池仅能容纳下坡面径流量的95%.
In 1945, Tianshui Soil and Water Conservation Experimental Station began to measure the water and soil loss on the slopes of 3 ° ~ 27 ° due to the lack of experience and sufficient information at that time. After the cement plot designed for the measurement of 100 m2 (5 × 20) The water tank capacity is 3.3 m (1.6 m in height and 1.6 m in diameter), and then slightly increased to 19.1 m (1.5 m in diameter and 1.8 m in height) in the new experimental area in 1954. At present, Water conservancy and erosion reservoirs used by the Science Experiment Station and the Xifeng Town Soil and Water Conservation Science Experimental Station of Gansu Province are all modeled on this formula. Increasing the water reservoir plays an extremely important role in preventing overflow. However, August 11 ~ August 13, a continuous rainfall in Tianshui 48 hours, the number of 155 mm case, this reservoir can accommodate only 95% of downhill runoff.