FLOODING

FIRST TERM E-LEARNING NOTE

SUBJECT: BASIC SCIENCE 

CLASS: JSS 3

WEEK TWO

FLOODING

CONTENT

• Causes of Flooding.
• Factors that Affects Flooding.
• Consequences of Flooding.
• How to Control Flooding.

INTRODUCTION

Flood is a disastrous overflow of water from a lake or other body of water due to excessive rainfall or other input of water.

When there is heavy rain, so much water flows in=to the rivers that they come over the tops  of their banks and flood the land. This can be useful in many places as the flood carries a lot of silt into the flooded area thereby making that area very good for agriculture. However, if the floods are deep i.e., much, they can be harmful as they can destroy villages, etc.

Controlling floods will involve taking risks. Since floods are natural.

CAUSES OF FLOODING

1. Heavy rain.
2. Long periods of rain.
3. Very wet saturated soil.
4. Compacted or dry soil.
5. Overflowing rivers.
6. Lack of drainage system.
7. Blocked drainages.

EVALUATION

1. What is flood?
2. State four causes of flooding.

FACTORS THAT DETERMINE OR AFFECT FLOODING

1. The amount of water that runs off the wind.
2. The amount of rainfall.
3. The temperature.
4. The type and condition of the soil.
5. The amount and type of vegetation.

CONSEQUENCES OF FLOODING

1. Loss of lives and valuable properties.
2. Destruction of crops.
3. Loss of livestock.
4. Widespread of waterborne diseases.
5. Disruption of business activities.

HOW TO CONTROL FLOODING

1. By building dams
2. By building very high walls along the rivers banks to prevent it from overflowing its banks.
3. By widening the rivers.
4. By building reservoirs to hold more water during flooding.
5. Streams may be diverted so that they do not flow into a particular river and result to flooding.
6. Irrigation

EVALUATION

1. State four consequences of flooding.
2. State four factors that leads to flooding.
3. State fours way to control or manage flooding.