１９５８年の鶴見川洪水浸水被害地域図だそうです．
（以下含め，鶴見川流域誌／河川編，京浜河川事務所より引用作成）
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
縄文時代の海岸線を想像した地図です．
綱島が島になっているところ，小机が湾になるところ，
ほぼピッタリ重なりました．
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
１９６６年の鶴見川洪水浸水被害地域図だそうです．
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
１９７６年の鶴見川洪水浸水被害地域図だそうです．
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
１９８２年の鶴見川洪水浸水被害地域図です．
被害地域は，鳥山川以西，まさに現在の遊水地部分です．