INFILTRATION AND ERODIBILITY OF A FLY-ASH SLUDGE MANUFACTURED SOIL

Six treatments of 50-mm-thick, 10% sloped applications of 1:1, 2:1, or 3:1 fly ash to sludge manufactured soil (Ecoloam(TM)) were evaluated and compared to a seventh control treatment of recompacted soil to det ermine infiltration and erosion properties. The greatest infiltration occurred during the first rain, independent of Ecoloam treatment-time averaged K-sat = 49.6 mm/h and SCS Curve Number, CN = 16. Infiltration during rains 2 and 3 was reduced by 65% compared to rain 1 and was eq ual to infiltration during rain 2 applied to the Control-K-sat = 18.1 mm/h; CN = 38. The slowest infiltration occurred during the third rain to the Control-K-sat = 3.4 mm/h; CN = 53. Ecoloam erosion was depende nt on the duration between when the Ecoloam was spread and the rain oc curred. After removal of this time dependency, the Ecoloam was 3.9 tim es more erodible than the control during the first rain; 1.8 to 2.5 ti mes more erodible than the control during the second rain; and 0.2 to 0.4 times more erodible than the control during the third rain.