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I think these rock filled ditches and embankments are are to catch storm water and prevent big flows which might carry soil away.
Flushing on December 25
Fox Oaks, etc.
Light going. Took busses. Landed up at Woodhaven Boulevard station. Walked west along Jamaica Avenue. Had a drink. Walked further west and caught the or train from 85 Street - Forest Parkway back into Manhattan.