| 释义 |
head water, head-water
1. a. pl. head waters: The streams from the sources of a river.
[1535Coverdale Gen. ii. 10 A ryuer..there deuyded it selfe in to foure heade waters.] 1802R. Brookes' Gazetteer (ed. 12) s.v. Lexington, Lexington..on the head waters of the Elkhorn river. 1862D. Wilson Preh. Man I. viii. 271 The head-waters of the Mississippi. 1878Huxley Physiogr. 4 The main stream splits up into a number of smaller streams, forming the ‘head-waters’ of the river.
attrib.1895Educ. Rev. Nov. 356 The whole river-system, its dismembered headwater streams excepted.
b. ellipt. = head-water-mark.
1908Westm. Gaz. 29 Apr. 6/3 The Thames has risen rapidly during the night, and is now 2 ft. 6 in. above head⁓water at Windsor.
2. head-water-mark, a mark showing the ‘head’ (cf. head n.1 17) to be allowed above a weir, etc.
1894Act 57–8 Vict. c. clxxxvii. §75 [They] shall..prevent the waters of the Thames being at any place above the level of any head-water-mark for the time being fixed. |