PDF-Water in soils: Infiltration and redistribution

Overview Infiltration The movement of water from the soil surface into the soil RedistributionThe subsequent movement of infiltrated water in the unsaturated zone of a soil This can involve exfilt. Soil Water Processes. P = Q + ET + G . + . Δ. S. Infiltration. Infiltration capacity: . The maximum rate at which water can enter soil. . Infiltration capacity curve:. A graph showing the time-variation of infiltration capacity if the supply were continually in excess of infiltration capacity. . past . present and future . Chris Searle. Grower Liaison Officer . Suncoast Gold Macadamias . Gympie . Qld. Background. Macadamias one the few Australian plants brought into cultivation. Native to coastal rainforests of SE . Rainscaping:. Soils 101. . Soils 101. Living, breathing dynamic system. Chemical, . physical . and biological characteristics. Soil . Formation -- 5 . Influencing Factors. C. limate . -. weathering, freeze, thaw, wetting, drying. Soil . Definition – mixture of mineral particles, eroded rock, water, air, organic matter and living organisms. Gravel – larger than 2 mm. Sand – 0.05 to 2 mm. Silt – 0.002 to 0.05 mm. Clay – smaller than 0.002 mm. Soil Water Processes. P = Q + ET + G . + . Δ. S. Infiltration. Infiltration capacity: . The maximum rate at which water can enter soil. . Infiltration capacity curve:. A graph showing the time-variation of infiltration capacity if the supply were continually in excess of infiltration capacity. . SCS method. Soil conservation service (SCS) method is an experimentally derived method to determine rainfall excess using information about soils, vegetative cover, hydrologic condition and antecedent moisture conditions . (Mays p 310-321). Learning objective. Be able to calculate infiltration, cumulative infiltration and time to ponding using the Green-. Ampt. method as given in Mays Section . 7.4. The rate at which water can infiltrate is important for determining the partition between whether rainfall infiltrates or becomes runoff that flows overland to streams.. Hydrology and Water Resources . RSGIS. Institute of Space Technology. October . 11 & 23, . 2013. Infiltration, Percolation, Seepage. Infiltration. Water moving into soil by crossing the soil surface. Gravel – larger than 2 mm. Sand – 0.05 to 2 mm. Silt – 0.002 to 0.05 mm. Clay – smaller than 0.002 mm. soil. Renewable resource. Renews . very. slowly. 1 cm takes 15 years to form. soil. Importance. Mike Trojan - MPCA. February 27, 2019. Note: this webinar was requested of MPCA by stakeholders. We encourage you to ask questions during the webinar so that we can clarify issues as we go through the material. Slope. Degree of saturation. Porosity. Permeability. Capillarity. Vegetation. Land use. What factors affect the movement of water?. Slope . is how steep the land is.. The steeper the slope of the land, . Green . Ampt. method. Ponding time . Reading: Applied Hydrology Sections 5.1 to 5.6. depth. Wetting Zone. Transmission. Zone. Transition Zone. Saturation Zone. Wetting Front. q. Infiltration. General. 137. Cs to forest soil. Hikaru. IIDA. 1. ）. ，. Hiroaki KATO. 1. ）. ，. Tomoki SHINOZUKA. 1. ）. ，. Satoru. . AKAIWA. 1. ）. ，. Tatsuya YOKOYAMA. 1. ）. ，. Sean HUDSON. 1. ）. , Janice HUDSON. Water entering the soil at the ground surface . It replenishes the soil moisture deficiency and the excess moves downward by force of gravity called deep seepage or percolation and builds up the ground water table .