下图示意流经某城市小河水污染程度与流量、降水的关系。读图回答问题。
(1)说出小河水污染的变化特点，简析该次水污染形成的原因。(6分)
(2)简述防治该河水污染可采取的主要措施。(6分)
正确答案及解析
正确答案
解析
(1)特点：污染总体呈“W”形变化(先减轻后加重，3日污染最严重，随后减轻恢复常态)。
原因：城市地表污染物较多；降雨后污染物被径流带入河流；河流流量小，河水自净能力差。
(2)加强宣传教育，提高水环境的保护意识；禁止各种生产、生活污水直接排放：建设完善的城市截污管网和净化设施；引水冲污，增强河水自净能力。
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