Some city water treatment facilities combine storm water and sanitary sewage systems. During heavy storms, these treatment facilities may be overwhelmed with water and untreated storm water mixes with sewage and flows directly back into the streams and rivers where treated water usually returns. What might be the best way to address this problem?

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Some city water treatment facilities combine storm water and sanitary sewage systems. During heavy storms, these treatment facilities may be overwhelmed with water and untreated storm water mixes with sewage and flows directly back into the streams and rivers where treated water usually returns. What might be the best way to address this problem?