Mr. Cox said that he flew over parts of Iowa in a helicopter last spring after a severe storm and found that deep gullies had formed in unprotected farmland, becoming conduits for soil runoff.

考克斯先生说去年春天一场暴风雨之后他坐直升机飞过爱荷华州的部分地区发现未受到保护的土地上在冲刷后已经形成了一些深沟，这些深沟成了土壤表层流失的管道。

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The result shows that runoff drought index and spring wheat climate output of Hexi irrigational area appears opposite variation tendency.

研究结果表明，径流量干旱指数与河西灌溉区春小麦气候产量呈反位相的变化趋势。

youdao

The result shows that runoff drought index and spring wheat climate output of Hexi irrigational area present opposite variation tendency of phase.

研究结果表明，径流量干旱指数与河西灌溉区春小麦气候产量呈反位相的变化趋势。

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The high spring flows would mimic the historic flows of the Missouri, which were larger due to runoff from snow melt.

CNN: Missouri River destiny hangs in the balance