(09/24/10) BROOKLYN - Last week's tornado has left a lot of raw sewage in the Gowanus Canal.

Officials say the rain, combined with sewage from homes and businesses, mixes with storm water from the street and flows right into the canal. Residents in the area say the overflow is pungent. Most of the canal has cleared up, but neighbors say some sections still need more time.

Officials say a project to upgrade the flushing tunnel is expected to be completed by 2013. Until then, officials say the system will naturally clean itself.