water depth, depth of the water
川のこの部分は水深が深い。
The water is deep in this part of the river.
港は水深があったが、桟橋はごく小さい。
The harbor was deep, but the pier was very small.
この船には、かなり大きくて水深のある港が必要ですから
Because this ship needs a port that’s quite large and deep enough for it.
まだ水深は十分あるのは明らかだった。
It was clear that the water was still deep enough.
水深は十分にあった。
The water was deep enough.