sub-riveradj.n.

1836 N.-Y. Spectator 19 Sept. This undertaking was commenced several years ago, in order to effect a sub-river passage, it being inexpedient to make a bridge in this part of the city.

1895 Westm. Gaz. 7 Sept. 4/4 The whole of the sub-river section of the line.

1912 G. H. Gilbert et al. Subways & Tunnels N.Y. iv. 25 The construction of the approaches to the sub-river tunnel was carried out between heavy sheet piling.

2010 Gold Coast Bull. (Austral.) (Nexis) 20 Nov. 36 Gold Coast and Beenleigh services would be 10 minutes faster if they took new tunnels through the proposed sub-river Woolloongabba shortcut.

1849 J. Gibbs Considerations Sewage London 63 These sapping sewers would have to be conjoined with the great adit or sub-river by cross sewers.

1909 Times 4 Aug. 5/4 The river waters, after being diverted into the sub-rivers Negapa and Molinos, are conveyed through the mountain.

1914 Jrnl. Royal Anthropol. Inst. 44 202 The drainage-systems of the lakes referred to now exist as sub-rivers, which only during prolonged inundation swell to anything like the dimensions they must have had in Pleistocene.

1994 K. N. Bhatt in S. P. Nagendra Develop. & Change xi. 172 All the major rivers of Northern India originate from U[ttar] P[radesh] hills with a beautiful system of thousands of sub-rivers and streams joining the main channels in the area.