| 释义 |
ponding, vbl. n.
[pond v.]
a. In senses of the verb.
16731st Cent. Hist. Springfield (U.S.) (1899) II. 119 Provided it be not prejudiciall to the high way nor to any mans propriety by ponding up of water. 1830Lyell Princ. Geol. I. 291 The ponding back..of this great body of fresh-water. 1857Ruskin Elem. Drawing i. 35 The use of turning the paper upside down is to neutralise the increase of darkness towards the bottom of the squares, which would otherwise take place from the ponding of the colour.
b. Blockage of a sewage filter; the accumulation of liquid above a filter.
1939L. B. Escritt Sewerage Engin. vii. 133 Excessive flows..are often the cause of ‘ponding’ of the filters. 1953E. W. Steel Water Supply & Sewerage (ed. 3) xxiv. 488 Media of small size will furnish more surface, but unloading will be less complete and ponding on the surface [of the filters] is more likely. 1971T. H. Y. Tebbutt Princ. Water Quality Control xii. 120 Film growths may result in blockage of the voids causing ponding of the filter and anaerobic conditions. Ibid. 122 When the first filter shows signs of ponding the direction of flow..is reversed. |