CE2004 Drainage-permeability & seepage handout

CE2004 Drainage-permeability & seepage handout -...

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Unformatted text preview: Drainage: permeability and Seepage Drainage: permeability and seepage Soil water – location and characteristics Runoff Infiltration Permeability Darcy’s Law Measurement Seepage Flow nets Sheet flow Rainsplash erosion Incipient channels Rills Gullies Deposition/ Supply to Channel Consequence of supply>infiltration: Consequence of supply>infiltration: Hortonian (Overland) flow Hortonian (Overland) flow Critical Threshold Break of slope Top of slope Surface water - runoff Controlled by: Supply Infiltration capacity Slope Surface roughness Where is the water within soils? ……………………… What most engineers focus on But don’t forget… “………………” e.g. in clays ……………… e.g. roots, DOM Volumes Soil Column Masses Total volume V voids V v air V a AIR air M a M a = 0 water V w WATER water M w Total mass M solids V s SOLIDS solids M s Water in the Three-Phase Soil Model Soil water – the catena concept Soil water is NOT always ……………… across an area/site What might cause this? Soil water “catena” e.g. Surface Groundwater table Poorly drained Well drained Pond Infiltration rate What does this mean? Rate Time Soil ………..: aggregate breakup www.maf.govt.nz/mafnet/rural-nz/sustainable-resource-use Dry, dense silt cap Partially disintegrated silty aggregates Intact silty aggregates Permeability Low………………High Soil crusting: ……………….....
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This note was uploaded on 11/23/2011 for the course ENGINEERIN H203 taught by Professor Michael during the Spring '09 term at Brunel University.

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CE2004 Drainage-permeability & seepage handout -...

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