minutia
发表于 2025-3-21 19:27:01
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Irksome
发表于 2025-3-21 23:59:02
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机密
发表于 2025-3-22 00:58:54
Surface hydrology,r small developing areas in urban centres and for larger areas of agricultural land to the successful containment of major rivers in flood. Consequently, the hydrological events producing superfluous water may be an intensive local storm, the accumulation of excess rainfall over a wet spell of a few
疾驰
发表于 2025-3-22 05:38:23
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pantomime
发表于 2025-3-22 11:38:00
Field drainage in temperate climates,urope, the equivalent region in eastern North America and the steppes and prairies of the continental interiors. The equivalent zone in the southern hemisphere is much more restricted in area but is equally productive. The soils of the prairies and steppes usually do not need drainage works because
范围广
发表于 2025-3-22 16:37:17
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范围广
发表于 2025-3-22 19:26:58
River systems,se catchments may be controlled by the conditions in the rivers; conversely, the rivers must themselves be designed and maintained to accept all the waters emptied into them both safely and economically. Thus, in drainage, river flows are important both directly and indirectly.
Carcinoma
发表于 2025-3-23 00:14:35
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Calibrate
发表于 2025-3-23 04:24:32
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下垂
发表于 2025-3-23 06:33:23
Deep drainage,n terms of drainage and water supply than surface water, but it risks being overlooked even by the engineer because it is easy neither to see nor to quantify. In England and Wales slightly more than one-third of water for public supply derives from groundwater; in Scotland it is only 3%. In arid cli