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sub-affluent
sub-affluent n.
Brit. 
/ˈsʌbˌaflʊənt/
, /ˈsʌbˌaflʊənt/U.S. /ˈsəbˌæfluənt/
Physical Geography a minor tributary stream; a tributary of a tributary; cf. affluent n. 2./ˈsəbˌæfluənt/ΚΠ
1853 Friend's Rev. 4 June 601/1 It gives rise to both of the main and numerous sub-affluents of the Columbia river.
1872 E. E. Frewer tr. J. Verne Meridiana v. 43 The Kuruman..increased by the waters of a sub-affluent, the Moschona.
1950 Imago Mundi 7 76 32 affluents and sub-affluents are attributed to the most important Portuguese tributary of the Tagus.
1986 M. Mainguet in F. El-Baz & M. H. A. Hassan Physics Desertification 232 These pleistocene dunes have dammed most of the affluents and subaffluents of the middle-east Niger River.
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