So when it rains they are easily washed into the groundwater and runoff water.

所以当下雨的时候，它们很容易被冲到地下水以及径流水中。

As the runoff water passes, they retain excess nutrients and some pollutants.

随着径流水的流过，它们保留了多余的养分和一些污染物。

They're an option I wish more people would reach for, as runoff, water access, labor issues and monoculturing plague a lot of modern agriculture here in North America.

他们是我希望更多人能够选择的选择，因为径流、水资源获取、劳动力问题和单一栽培困扰着北美这里的许多现代农业。

Because of the drought, there is less water runoff from cities into the ocean. As a result, the ocean water is cleaner. But pollution remains a problem in other areas, including popular beaches.

因为干旱，各个城市流入海洋的水更少，这样海洋水就更清洁。但在其他地区污染仍是个问题，包括受人欢迎的沙滩。