This observation was made only eighteen hours after the maximum
height over Beattie's dam at Little Falls, and twelve hours after the
flood crest passed Dundee dam. The conditions here outlined illustrate
the rapidity with which flood waters are discharged from the Pompton
drainage area, and the deterring effect of Great Piece Meadows upon the
flood.
The rise of the flood on Rockaway River at Old Boonton was almost
coincident with that on Pequanac River at Macopin dam. The maximum flow
occurred fourteen hours later than the maximum on the Ramapo at Pompton.
The flood crest did not reach Chatham on upper Passaic River until the
morning of October 11, or about twenty-four hours later than the flood
heights in Pompton and Rockaway rivers, and about twelve hours later
than the maximum over Dundee dam.
Adequate reasons for these differences in flood periods between
neighboring points are abundant. They are apparent after a review of the
physiographic conditions described in Water-Supply Paper No.
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