Is River Dredging Enough to Prevent Flood Risk?


Andreas Klippe no responses June 4, 2021

Ulysses (international name: Vamco) brought back the agonizing memories of Ondoy (international name: Ketsana), which also caused drastic flooding in 2009 in the Philippines. Ulysses, the 21st tropical cyclone that entered the Philippine Area of Responsibility in 2020, prompted downpours particularly across Metro Manila from the evening of November 11 to the morning of the 12th. Thus, Marikina River’s water level unexpectedly swelled up to 22 meters at 11 AM on November 12.

To prevent this from happening again, the Department of Environment and Natural Resources (DENR) started its river dredging operation on Feb 17, 2021. 

Do you think dredging the Marikina River will really stop floods from taking place? Or will it only provide a temporary solution due to uncontrollable circumstances? Let us answer these questions as we understand river dredging closely. 

How Is River Dredging Done?

Dredging means augmenting the depth of the river channel by removing sediments and debris that build up over time.

Dredging normally uses a dipper dredger mounted on a barge. So what do dipper dredgers do? They scoop the sediments and debris like a shovel. 

A dipper dregger is floating on the river, scooping sediments, river dredging
A dipper dredger scoops sediments from the river.

Frequently, the purpose of dredging is to ensure that boats and ships can safely pass. Without the practice of dredging, vessels will have a hard time floating.  Also, with river dredging, sediments with a variety of pollutants are removed and people and animals are less exposed to contaminants. 

Aside from Maritime and pollution prevention, dredging also helps in flood prevention. Here’s how:

Does River Dredging Prevent Flooding?

To increase the water capacity of Marikina River and prevent overflow, DENR went for dredging an estimated 50,000 cubic meters of silt. As for the equipment, DPWH Metro Manila, headed by Director Eric Ayapana, deployed crawler-type backhoes.

Well, whatever the tool is, the decision to dredge the Marikina River is for reducing the risk of flooding. But, we CANNOT expect it to be the best long-term solution because as climate change continuously worsens, the amount of rainfall increases. It’s like continuously emptying out a water drum while the faucet is on. 

We cannot expect river dredging to be the best long-term solution because as climate change worsens, the amount of rainfall increases.

Dredging is like that — just a temporary answer to flood risk prevention. 

A Long-Term Solution Is Still the Best

This river is overflowing due to heavy rainfall but does not cause flooding to nearby areas because it is surrounded by INEROTM Mobile Flood Barriers, river dredging
This river is overflowing due to heavy rainfall but does not cause flooding to nearby areas because it is surrounded by INEROTM Mobile Flood Barriers.

Apart from uncontrollable, torrential rainfall that may waste your effort on dredging a river, the sediments and debris that you removed will eventually build up again. If that happens, will you consider dredging again? Even if there is an existing technology that is long-lasting, portable, adaptable, and cost-effective? 

Nothing is wrong with thinking that dredging is also helpful, because it is. However, before or after having the river dredged, flood barriers may also be used to prevent river overtopping. One ideal flood barrier to use is the Made in Sweden INERO™ Mobile Flood Barriers as floodwalls.  Here’s why.

  1. INEROTM IS LONG-LASTING. INEROTM Mobile Flood Barriers can serve you for 50 years or more. It is unlike river dredging whose effect only lasts for 1 to 3 years.
  1. INEROTM IS PORTABLE. You can easily carry and install INERO™ Mobile Flood Barriers where flooding takes place. Actually, installing 100 meters of barriers can simply be done by two people. Why? They have this interlocking feature that makes them easy to assemble and disassemble. All floodproofing barriers are long-lasting, but they are not all portable like INERO™.
  1. INEROTM IS ADAPTABLE. Slopes and edges of a river? No worries! INEROTM can fit ANY surface or topography. You can have them installed on grassy, muddy, or sandy surfaces! 
  1. INEROTM IS COST-EFFECTIVE. Since INERO™ Mobile Flood Barriers are portable and adaptable, there is no need for extra civil works. That itself will already save you money. For the Marikina River that has a length of 78 kilometers, I assure you that INERO™ is the most cost-effective solution to stop it from causing flooding.

FIND OUT MORE ABOUT INERO™

If you are already convinced and you want to discuss the topic, have a conversation with one of our Flood Experts to be more enlightened on river flood protection just by clicking the “BOOK A MEETING” button below.

But if you prefer to behold a clear view first of how INEROTM Mobile Flood Barriers are installed, just click the “WATCH THE VIDEO” button below.

Andreas Klippe

About the author

Andreas Klippe is founder of the Asian Center for Flood Control located in Clark Freeport Zone, Philippines.

for Free!

How do you stay safe during a flood?

Protect your properties from flood damage by just learning from our simple yet effective tips.

Sign up now for FLOOD EXPERTS weekly newsletter.

Your privacy is SAFE with us and will never be sold, rented, or shared to anyone – EVER!

ARCHIVES

  • 2021
  • June (2)
  • May (3)
  • April (3)
  • March (3)
  • February (4)
  • January (2)
  • 2020
  • December (3)
  • November (1)
  • October (4)
  • September (2)
  • August (2)
  • July (4)
  • June (4)
  • May (3)
  • March (2)
  • February (2)
  • January (3)
  • 2019
  • December (3)
  • Connect with Us

    World Trusted Flood Control Solutions

    Facebook Feed

    Flood Control Asia
    Flood Control Asia
    Two weather systems are currently affecting the conditions in different areas across the Philippines. The Northeast Monsoon or Amihan is causing cold winds over the extreme northern Luzon; and the Easterlies or the humid air coming from the Pacific Ocean on the eastern portion of the country.

    PAGASA said in their latest bulletin that cloudy skies with scattered rain showers and thunderstorms are expected over #Caraga and #Davao region; partly cloudy to cloudy skies with isolated light rains over #Batanes and #BabuyanIslands. Meanwhile, #MetroManila and the rest of the country may experience partly cloudy to cloudy skies with isolated rain showers.

    #Weather #News #Update
    Flood Control Asia
    Flood Control Asia
    For the ones fighting for equality for women, for those fighting against injustices, and for those who are willing to fight for those who cannot fight for themselves, this day is for you.

    From all of us at Flood Control Asia RS Corp., we greet all the wonder women from around the world a Happy International Women's Day!

    #ChooseToChallenge #IWD2021 #FloodExperts #WomensHistoryMonth #internationalwomensday2021 #internationalwomensday
    Flood Control Asia
    Flood Control Asia
    In their latest bulletin, PAGASA said that they are monitoring the Low-Pressure Area (LPA) outside the Philippine Area of Responsibility (PAR), which was last estimated 1,695 km East of Mindanao.

    Meanwhile, the Easterlies or humid air are forecast to affect the eastern portion of the country.

    #Weather #News #FloodExperts