Focus of past research Identify materials suitable for on-site wastewater treatment and disposal –suitable means k sat > 0.4 cm day -1 Determine if quartz veins conduct water quickly Identify horizon properties that allow prediction of restrictive k sat
Objectives Review typical k sat changes with depth Discuss water movement through saprolite matrix Review research on quartz veins and water movement
Pore fillings and coatings Spaces between gravels in veins are filled with clay or Fe/Mn minerals These materials restrict water flow through veins All veins and fractures studied had materials in pores or gravels
If pore fillings are hydrothermal then veins are probably plugged very deeply
Conclusions Water conducting voids in saprolite are: –Spaces between mineral grains –Channels made by organisms Veins and fractures conduct water at rates similar to the saprolite matrix Veins do not impede flow Clay and oxide minerals plug pores in fractures and veins No unplugged features were observed
Conclusions The saprolite (C horizon) usually had a higher k sat than the BC horizons BC horizons formed under well developed Bt horizons Water flow through C horizon occurs between mineral grains (like sand) BC horizons have a low k sat values when spaces between grains are filled in.