Wood from Lake Iroquois deposits has been dated at about 12,000 years old. Sand and gravel are produced mainly from extensive outwash deposits, and in lesser amounts, from raised beaches, eskers, and kames. 展开 被引量: 39 年份: 1987 ...
As I understood it, as with virtually all of the East Anglian gravel and sand quarries, there might have been aspirations from consverators and ecologists to see this quarry converted into a nature reserve once they’ve scraped out everything they want from the Earth here. Unfortunately, there...
A silty sand (SM) could have 1.4 x 10-3 in./hr (10-7 m/sec) infiltration rate. Open-graded, crushed aggregate placed in the openings of permeable interlocking concrete pavements will have an initial infiltration over 500 in./hr (over 10-3 m/sec), i.e, 10,000 times greater than ...