当草地地面覆盖达90%时，草被拦蓄径流效益达90%以上，而基本上无侵蚀发生。

When surface cover of natural grassland reaches 90%, the benefits for grass reducing surface runoff is above 90% and not any erosion occurs.

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简要介绍了人工神经网络用于洪水预报的基本原理，对降雨径流预报的网络模型进行了改进。

This article presents the principle of ANN briefly in the application of flood forecast and an improved network algorithm of rainfall runoff forecasting.

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WEPP模型对径流量的模拟结果基本可以接受，而模型对土壤侵蚀量的模拟值出现了一定偏差。

Predicted runoff by WEPP was accepted, but predicted soil loss was a little far from the measured values.

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