The Hydrological Cycle
Objective: To understand the functioning of the hydrological cycle and the processes that exist within.
The Hydrological Cycle: This is the continuous movement of water through the land, oceans and atmosphere. The hydrological cycle is known as closed system because water cannot be added or lost.
Closed System: This is a system where water can not be added or lost. The hydrological cycle is known as a closed system because it includes all the water on our planet and no water can be added to it, or lost from it.
Task 1 - Mapping from memory or students to make a copy of the diagram to the right and add the correct labels to letters A-F using the rather unusual video. You'll need your headphones and the song may well be stuck in your head all day. Sorry!
Task 2 - Go to geographyalltheway.com directly by clicking here. Complete the 'Global Hydrological Cycle' worksheet fully, check with the class and then print out and put in your folder.
Objective: To find how this part of the hydrological cycle that happens on land works; also known as a drainage basin
Task 1 - Using the template provided to the right for you, complete the 'pop-up drainage basin task' as set out in the PowerPoint instructions to the right hand side. You might want to maximise the screen so you can read the instructions carefully. *Thanks to Mr Cassidy*
Drainage Basins as Open Systems
Open System: This is a system where water can be added or lost. A drainage basin is known as open system because water can be added and lost too
Inputs (when water is added to the system)
Processes (when water is moving in the system)
Stores (when water is stationary in the system)
Outputs (when water leaves a system)
Task 2 - Complete the activity at the bottom of the page. To do this, you must decide which process and definition goes where in the system.
Task 3 - Study each of the five images below carefully (click to enlarge). Create a table with two columns and six rows.
i. Title of row 1 is 'Photo of factor affecting how quickly water gets to the river'
ii. Title of row 2 is 'Description of how it affects how quickly water gets to the river'
.....then place each of the images in the remaining five left hand rows.
iii. Describe how each of the five factors affect the speed at which water travels through the drainage basin (processes) and reaches the river (output)
Try to include the processes from task 2 that would be affected.
Task 2. Study the definitions below carefully and then copy and paste them into the correct column in the worksheet on the right.
Percolation: When water travels from unsaturated ground into saturated ground.
Interception: When an object (building, tree) stops precipitation reaching the ground beneath.
Transpiration: Liquid water evaporating from vegetation.
River discharge: Eventually most rivers enter the sea and discharge the river's flow into the sea.
Groundwater flow: The movement of water through saturated ground.
Channel flow: Water that is travelling in rivers or streams.
Surface run-off (overland flow): When water travels across the surface of the earth
Stem flow: When intercepted water then travels down the branches and trunks of vegetation.
Evaporation: Liquid water from surface stores and rivers turning into water vapour (gas).
Surface storage: Any water that is held on the surface of the earth e.g. lake or pond. Some surface stores like puddles may only be temporary.
Infiltration: When water travels from the surface of the earth into the ground beneath.
Groundwater storage: Water that is stored in saturated ground.
Throughflow: The movement of water through unsaturated ground.
Canopy drip: Intercepted water dripping off vegetation onto the ground.
Soil-moisture storage: Water that is stored below the surface in unsaturated ground.
Precipitation: Any moisture that falls from the sky e.g. rain or snow.