Rivers, Floods & Management

1.1. To understand the concept of a system To understand the concept of a system and how this applies to rivers.and how this applies to rivers.

2.2. To be able to draw and annotate To be able to draw and annotate hydrological cycle and drainage basin.hydrological cycle and drainage basin.

3.3. To explain different movements through To explain different movements through the cycle.the cycle.

The Water CycleThe water cycle is a closed

system because "water" comes in three forms or phases: solid, liquid and gas. Water can change

phases by melting, evaporating, sublimating,

freezing or condensing, but it is still water. The "closed system" is one where the basic material is neither

being created nor destroyed-- just moving

between phases.

The water cycle

So why is the hydrological cycle not closed?

In an open system there is movement of both energy and materials in and out of the system. All environmental systems,

including the hydrological cycle, are open systems.

The Drainage basin

Where can drip go?

clouds

Vegetation store Trees and plants

Surface store Rivers, lakes and glaciers

Soil store

Groundwater store

Sea

Key

The arrows show transfers of water

The boxes show stores of water

Words to add to arrows not labelled.Evaporation (twice), Interception, Infiltration, Evapotranspiration, Percolation, Infiltration. Surface runoff, Groundwater flow, Throughflow, condensation. The arrow with a star does not need a label.

Outcomes

1. All students will know key terminology for hydrological cycle and drainage basin. Why rivers

are important to man and the basics of hydrological cycle.

2. Some students will also be able to describe the cycle as a system of inputs stores and outputs.

3. A few will progress even further to know difference between water cycle and hydrological cycle.