(a) The following diagram shows a schematic of the global hydrologic cycle. Name
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Question
(a) The following diagram shows a schematic of the global hydrologic cycle. Name the processes that are occurring at each of the locations labelled A to E? Tree Land Ocean (5 marks) (b) The following graph and table give information on the average potential evapotranspiration (PET) and precipitation for a catchment. In which month of the year do you expect the greatest runoff to occur and why? (5 marks) 160 140 120 100 PET Precipitation Month Jan Feb Mar 145 115 93 Precipitation 41 79 94 115 107 103 119 113 122 101 94 1155 Ma Jun Jul Au 38 32 35 60 63 106 126 131 986 20 Potential Evapotranspiration Nov Dec Annual Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov DecExplanation / Answer
(a) In process C the condensed water vapour is directly falling in the ocean hence it is Precipitation.
In process A the water is moving from ocean to the atmosphere and transformation of water vapor to liquid water droplets in the air, creating clouds and fog is taking place hence this process is Condensation.
In process B the water vapour that is present in clounds is falling on Earth's surface, hence it is termed as Precipitation.
In process E the release of water vapor from plants into the air is taking place, hence it is known as Transpiration.
In process D water moves across the land. This includes both surface runoff and channel runoff hence it is known as Runoff. Apart from this flow of water underground, in the vadose zone and aquifers is also taking place which eventually seep into the oceans and hence Subsurface flow.
(b) By seeing the graph we can see the difference between precipitation and evapotranspiration is maximum in the month of may, hence we can expect the greatest runoff in month of may.
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