Information & Explanation

Flood Awareness - How to prepare for floods

Good preparation and knowing what to do in a flood will increase your safety and chances of survival if it happens in your area. It can also help minimize potential flood damage and accelerate recovery efforts. Check out our Flood Awareness Brochure and the information video below to see what you should do before, during, and after a flood.

(These links / iframes are to be replaced once communication materials are approved)

Forecast bulletins

The forecast bulletins are issued by the Quang Nam Provincial Hydro-meteorological Center including:

• Hydrological forecast bulletin: provides information on hydrological trends during the forecast period, detailed water level ​​for each duration from 06 hours to 24 hours at hydrological stations in the  river basin. 
  
• Flood warning bulletin: is issued upon detecting probability of river water level reaching or exceeding warning level 1 and continuing to rise or irregular flood.
• Flood bulletin: is issued when river water level has reached and continues to exceed warning level 2 or has subsided but remains higher than or at warning level 2.
• Emergency flood bulletin: is issued when river water level has reached and continues to exceed warning level 3 or has subsided but remains higher than or at warning level 3.

Flood map 

The flood map service provided by this website provides insight in the flood depth that may occur for a specific maximum water level that is forecasted for Hoi An Hydrological station in the next 24 hours. In case a flood warning is active the website automatically displays this flood map. The flood map shows by color code the flood depth that may occur at a specific location.

1.      The flood map is displayed on the map. Water depth increases when the color blue becomes darker.

2.      In the legend you can see which flood map is active and read the for each color the water depth. In this case the flood map is active for the situation in which the water level at Hoi An station reaches 1,80 meter above Mean Sea Level.

3.      It is possible to change the transparency of the flood map using the slider.

4.      When you click / tap on the flood map a popup will display the forecasted water depth at that location.

5.      The popup provides the expected water depth at the clicked location. For reference it also provides the expected water depths for the various warning levels. In the example shown in the picture we can see that Alert Level 2 is active and that water may reach 0.9 meter above ground level at this specific location.

How to use homepage

1: Menu to switch between the pages of the website

2: Tool to switch between English and Vietnamese language 

3: Tools to manipulate the map

4: Tools to control the map and data layers

How to use maps

In the homepage, users will see these tools as visualized in the following figure:

These controls have the following meanings:

-1: Allow to zoom in

-2: Allow to zoom out

-3: Allow to return the default scale and position

-4: Allow to capture the current screen 

-5: Allow to hide/show legend on the map

-6: Allow to switch between base map layers

-7: Allow to switch between data layers

-8: Allow to turn on/off the rain map, flood map, allow to adjust the transparency of the rain or flood map layers

The map interface also allows to:

- Click to view station information

- View chart data of stations

How to read the bulletins

On the homepage click on the menu “Flood Bulletins”

To see details, click on a bulletin.

How to use rainfall map

To view forecast rainfall data, user must activate Rain map :

The website will display rainfall map:

The website will display:

1: Tools that allow to Pause/Play, Reverse, Fast Forward to visualized the forecast rainfall map series, or let to drag and drop to view rain fall information

2: Legend of rainfall levels according to color ranges

How to use flood map

To view flood map, user can click to select layer Flood map:

The legend in the bottom right of webpage shows the flood depth color range. ,

When clicking on the map, website will display the flood depth at that location. In this popup window, user can see the forecast flood depth and flood depths according to warning levels.

How to view the timeseries of stations in chart form

a. Hydrological station

To view the water level timeseries at hydrological stations, users needs to select the data layer "Hydrological Stations" and click on the hydrological station to view. A graph of the timeseries will appear at the bottom of the screen. For hydrological stations, the graph will display as following: solid line is observed data; dashed line is forecast data; the horizontal dashed lines are the warning levels of the selected station.

Users can select to view information of many stations in the same graph, at this time the system will display data of different selected stations with legends.

-1: User can remove the chart of stations by clicking on the (x) button.

b. Rainfall station: 

The method to view the graph of the timeseries data is similar to the hydrological station. However, only observed rainfall timeseries data is presented on the website.

c. Reservoir: 
The method to view the graph of the timeseries data is similar to the hydrological station. However, timeseries data presented on the website is observed data including inflow, outflow through spillway, outflow through turbine, water level of reservoir.

How to use the community feedback

For sending the flood warning information to the authorities, users will access the "Community Feedback" menu, the website will display information as shown below:

Here you can:

-1: Enter the warning information, including Full name, Email, and Address are required fields

- 2: Click "Get current location" or click on the map to select the flood location.

- 3: Click "I'm not a robot" for authenticate

- 4: Click Submit to send information

How to view alert

When you visit map page, you can see on the map the location with icon , it is represent the alert location:

You can click to view the detail:

How to activate the function to receive notifications

The Website and mobile app provide flood warnings with push notification. The push notification feature is added to help provide the users of the website and the mobile application with the information they need to make informed decisions. The push notifications provide 5 types of messages and are issued simultaneously with the flood warning service shown on the website and mobile application.

 

How do I receive push notifications

·        For web browsers: On first time loading of the website, the browser requests users if they want to receive notifications. Click “Allow” to receive push notifications. Settings can always be adjusted later.

 

·        For Mobile app users (Android / iOS): during installation the app will ask permission to sent push notifications. Click “Allow” to receive push notifications. Settings can always be adjusted later.

 

Google Chrome Browser

·        On first time loading the website requests the user to allow showing notifications

 

You can can change notifications settings as follows:

·        Click on the “View Site Information”

·        Activate Notifications

 

Microsoft Edge Browser

·        On first time loading the website requests the user to allow showing notifications

 

You can can change notifications settings as follows:

·        Click on the “View Site Information”

·        Activate Notifications

 

 

Firefox browser

·        Click on the “Change if you want to receive notifications”

·        Click “Allow”

 

Android App users

On your Android device, launch the Settings app - the icon usually looks like a gear

Scroll until you find Notifications > Tap 

Scroll to Hoi An FEWS App > Tap

 

Ensure that the gray slider next to Block All is pushed to the left so that you will receive notifications.

You can also edit the settings for Show Silently and Override Do Not Disturb individually.

*To turn off notifications - tap Block all again. This will move the slider to the right and it will turn blue. 

 

iOS App users

Tap Settings

Tap Notifications

A list of your apps that support push notifications will appear

Scroll to Hoi An FEWS App > Tap

Slide the Allow Notifications button to 'on' (green)

Sounds, Alerts, and Badges can all be turned on or off individually by sliding the button next to each 

 *To turn off push notifications > slide the Allow Notifications button to 'off'