Sirens

Alarm Definition:

Inform inhabitants about dangers and threats through different alarming means, and implement the Civil Defense instructions to protect individuals, possessions and national resources.

 
Purpose of Alarming:

Inform inhabitants about dangers in order to take the necessary precautions and follow the Civil Defense instructions through television and radio.

 
Siren Definition:

Sirens are modern equipments with different tones; each tone has a specified indication to inform inhabitants about dangers.

 
Alarming Means:

1. Fixed and mobile sirens.
2. Loudspeakers.
3. Media.
4. Any other means to alarm inhabitants.

Types of sirens:

1. Electronic.
2. Electric.
3. Wireless.

Siren Tones Definition:

This indicates different tones of alarms and purpose of each. The Kingdom and Gulf Cooperation Council Countries defined three tones as follows:

1. First tone: Intermittent tone for one minute, and it indicates danger before occurring.

2. Second tone: Dual tone for one minute, and it indicates danger while it is occurring.

3. Third tone: Constant tone for one minute, and it indicates end of danger.

Using Sirens: 

Sirens are used in peacetime, emergencies and wartime.

 
A- Peacetime:

• Natural disasters (such as floods, fluxes, volcanoes, tornados and landslides.)
• Industrial disasters: (such as radiation leaks due to nuclear reactions and chemical and biological weapons.)

B- Emergencies and wartime:

• Organizations destruction (chemical, biological and nuclear.)
• Air raids (missile attack by enemies.)

Sirens Distribution Standards:

1. Population Density: Importance of the city according to number of inhabitants.
2. Economic Importance: Importance of the city according to economic facilities available at that city.
3. Military Importance: Importance of the city according to military organizations available at that city.
4. Environmental Importance: Importance of the city according to number of factories available at that city.
5. Other Importance: Any other importance for specific cities such as the religious importance of Makkah and Madina.

Procedures followed in case of hearing sirens:

A- First Tone:

1. Wear the costume against chemical, biological and nuclear substances.
2. Move to a safe location (shelter, basement …etc.)
3. Avoid areas that are exposed to air raids and missile attacks.
4. Follow-up Civil Defense instructions on television or radio.

 B- Second Tone:

1. Put on the gas mask.
2. Stay in your shelter, basement or any safe area.
3. Follow-up Civil Defense instructions on television or radio.

 C- Third Tone:

1. Do not take off the gas mask unless you receive instructions.
2. Do not leave the safe area (shelter, basement...etc.) unless you receive instructions.
3. Follow-up Civil Defense instructions on television or radio.