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SITE UTILITY SYSTEMS
6.6 CHAPTER SIX
TABLE 6.1 Permeability of Backfill
The following tabulation may be used for preliminary estimates of average coefficients of
permeability for remolded samples of sand and gravel bases:
Coefficient of permeability (K)
Percent by weight passing 200-mesh sieve Coefficient of permeability for remolded samples *
1
3 10
2
5 10
3
10 10
4
15 10
5
25 10
*
The coefficient of permeability of crushed rock and slag, each without many fines, is generally greater than 1 ft/min.
FIGURE 6.4 Permeability of undisturbed soils.
FIGURE 6.5 Example diagram.
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