Les 9 - Rivieren in Nederland

• Aardrijkskunde
• Middelbare school
• vwo
• Leerjaar 3

Planning

• Types of rivers
• Rivers in the Netherlands
• Room for the river

Catchment area

Area that drains into the main river of a river system.

Types of rivers

• Rain-fed rivers
• Glacier rivers
• Mixed rivers

Statement: "Every glacier river is also a rain-fed river, but not every rain-fed river is a glacier river"

1. True
2. Not true

Normal situation

• The river flows between the summer dikes

Normal situation

• The river flows between the summer dikes
• Inside the dikes
• Everything protected by dikes

Normal situation

• The river flows between the summer dikes
• Inside the dikes
• Outside the dike
• The river flows outside the dikes

High water

• For instance during winter
• Floodplains can fill up
• Water is stopped by the winter dike

Room for the river

Three step strategy

• Storage (vasthouden)
• Retention (bergen)
• Disposal (afvoeren)

Water storage

• Lowers peak discharge (piekafvoer)
• The peak happens later (more time to prepare)
• Also waters the plants

Water retention

• This prevents water from being part of the peak discharge
• So it prevents floods
• Saves water for a dry period of time

Water disposal

• Getting rid of the water quickly and efficiently
• Essential in preventing floods
• No extra benefits

How to manage too much water (the Dutch way)

Three step strategy

• Storage (vasthouden)
• Retention (bergen)
• Disposal (afvoeren)

Homework

Assigment 1, 5, 7, 9 and 10 of §6.4