At proper intervals waste-gates should be arranged so as to discharge the water when necessary, without risk of damage to the ditch. In regions of heavy snow, these wasteways should be provided at intervals not greater than onehalf a mile. A Textbook on Mining Engineering - Página 671900Vista completa - Acerca de este libro
| Edward Wheeler Parker - 1905 - 690 páginas
...1886, p. 136. At proper intervals waste gates should l>e arranged, so a." to discharge the water wlien necessary without risk of damage to the ditch. In regions of heavy snow these wasteways should he provided at intervals not greater than one-half mile. Ditches poorly built in the beginning subsequently... | |
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