HIGHER+HYDROSPHERE

PLEASE NOTE IF LOOKING AT OLDER HIGHER WEBSITES THE UNIT IS NOW SHORTENED AND YOU DONT NEED TO KNOW RIVER PROCESSES, FEATURES OR OS MAPS.
 * __Hydrosphere__** –

Th 3 topics are: 1. Water cycle- question will ask to explain with aid of a diagram the Global Hydrological cycle.

2. Drainage basin

typical question: Describe the movement within a drainage basin.

__ [] __ __simulations here.__

3. Hydrographs Hardest part: Familiarisation with the storm flood hydrograph. Here is a copy of the powerpoint that was used in class:



A hydrograph is a method of representing the flow data of a river over time. It is a line graph as illustrated below. Frequently the stream hydrograph is related to rainfall shown as a bar graph alongside. The combined graphs are known as a storm (or flood hydrograph).

Various labels are used in the storm hydrograph, they should be familiar to you –  · **rising limb** – the rising river flow;  · **peak flow** – the maximum discharge achieved by the river;  · **recession limb** – the falling flow of the river;  · **base flow** – the normal flow of the river;  · **basin lag time** – the time difference between peak rainfall and peak discharge;  · **overland flow** – the volume of water reaching the river from surface runoff;  · **throughflow** - the volume of water reaching the river through the soil and underlying geology.   Here are some course notes I used in a revision session:    Example question from older Higher.   <span style="display: block; margin: 0cm 0cm 0pt 46.35pt; mso-list: l0 level1 lfo1; tab-stops: list 46.35pt left 49.65pt; text-align: justify; text-indent: -18pt;"> <span style="display: block; margin: 0cm 0cm 0pt 46.35pt; mso-list: l0 level1 lfo1; tab-stops: list 46.35pt left 49.65pt; text-align: justify; text-indent: -18pt;"> <span style="display: block; margin: 0cm 0cm 0pt 46.35pt; mso-list: l0 level1 lfo1; tab-stops: list 46.35pt left 49.65pt; text-align: justify; text-indent: -18pt;">Useful website: <span style="display: block; margin: 0cm 0cm 0pt 46.35pt; mso-list: l0 level1 lfo1; tab-stops: list 46.35pt left 49.65pt; text-align: justify; text-indent: -18pt;"> <span style="display: block; margin: 0cm 0cm 0pt 46.35pt; mso-list: l0 level1 lfo1; tab-stops: list 46.35pt left 49.65pt; text-align: justify; text-indent: -18pt;">[|BBC website]