Presentation on theme: "Factors affecting the movement of water through a Drainage Basin"— Presentation transcript:
1 Factors affecting the movement of water through a Drainage Basin INPUTS and OUTPUTS as shown by the WATER BEDGETPhysical Factors SOILGEOLOGYVEGETATIONSLOPE and Basin SHAPEHuman Factors AGRICULTURAL LAND USEURBANISATION WATER RESOURCE LAND-USE MANAGEMENT INDUSTRIAL LAND USE
3 Water Budget Based on the water budget for Cloverdale, California: * the climate is probably dry summer subtropical. * the deficit is most intense in July. * flooding is most likely a problem in January.
4 Heavy rain on compacted ground will not infiltrate Effect on speed of passage of water through drainage basin is ………..Why?A or B hydrograph?
5 Soil ConditionsHow much open space is there in rock? In this experiment we check the porosity of gravel, sand and silt, the raw materials that sandstone is made of.For example If you were able to add 90ml of water to 350ml of gravel, the porosity would be90 ml = = 25.71% 350 mlEffect of permeable rock on speed of passage of water is…? A or B hydrograph? Why?
6 The individual cells in the grass paver minimise grass and root compaction maintaining its infiltration capacity therefore reducing surface overland flow.Human interference to increase infiltration… how does it work?A or B hydrograph?
7 GeologyWhich rock will cause the most overland flow and why?Which rock might slow down the passage of water the most? A or B hydrograph shape?
8 GeologyWhich one might be pervious?Which one would slow down the passage of water the most? A or B hydrograph shape?Which one would be most likely to flood?
9 GeologyWhat is an aquifer?What is groundwater recharge?If basin is all aquifer rocks – A or B hydrograph shape?
10 Geology and Vegetation Infiltration rates in Navajo sandstone.What sort of climate?What sort of hydrograph A or B?
11 VegetationWhat processes are shown?How does vegetation affect infiltration?How does vegetation affect the speed of passage of water through the drainage basin?How does vegetation affect the hydrograph shape? A or B?
12 Vegetation and Infiltration Hickory forest will have hydrograph shape A or B?
13 A larger size outdoor pig unit needs light and permeable soils A larger size outdoor pig unit needs light and permeable soils. This is important, as even after days of constant rain, the farmer has to drive the vehicles to the paddocks to feed and supply water to the animals. However, the condition of the soil is of no considerable importance to the pigs.AgricultureWhat happens to infiltration rate? A or B hydrograph?
14 Agriculture – what can we see? Impact on overland flow? Impact on sediment movement? Hydrograph A or B?
15 IndustryMay demand increased water supplyEffect on passage of water?Hydrograph A or B?
16 IndustryCan also discharge waterEffect on hydrograph?A or B?Effect on water quality?Effect on sediment?
17 UrbanisationState four differences in hydrograph shape.Give a reason for each difference
18 UrbanisationWhat happens to evapotranspiration, overland flow, infiltration?
19 Increasing Urbanisation or movement towards the (what?) What happens to evapotranspiration, overland flow, infiltration?Effect on speed of passage of water?Effect on hydrograph shape – A or B?