Metro Manila Flood Control (suggestion)

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Metro Manila Flood Control (suggestion)

flipzi
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flipzi
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15 Oct 2009, 06:36 #1

The Ondoy Floods will return for sure and it shall be like that over and over again.

What we can do is to mitigate the effect of the flooding or control it somehow.

First, why that heavy volume?

The reason is that the rainwaters coming down from the areas surrounding Marikina River and Laguna Bay are all being flushed out into the Manila Bay via the single, narrow and overburdened Pasig River.



Planting trees on those mountains surrounding Metro Manila may help but it cannot stop that volume.

The proposed 40 billion pesos Pasig River/Marikina River project is not enough since the volume is really great and it would need constructing walls along the river 2 stories high.

That will surely shroud the buildings and structures along the river and will be an ugly sight to see.

The other solution is to build a second floodway to flush the contents of Laguna Bay so it can be used to decongest Pasig River and even use it longer for taking in floodwaters from the Marikina River/Pasig River systems..

The Laguna Bay is normally used to take in the floodwaters from the Marikina River. But when the Laguna gets filled, it will close its floodgates to force the floodwaters to take the Pasig River route instead.

Metro Manila suffered from severe flooding, and Manila City itself was particularly vulnerable. A few hours of moderately intense rainfall can inundate significant portions of the densely populated city. The worst and most destructive flood occured when the Pasig River overflows its banks during intense local rainfall.

The Mangahan Floodway Project was conceived as a practical solution to the over bank problem. The Project limits the discharge of the Pasig River in bank full stages by diverting the excess water through a man made channel to Laguna de Bay. The floodway can provide protection to the greater Manila areas from peak flows with up to 100 year recurrence interval.

http://www.ctie.co.jp/english/service/proj.../project10.html


The proposed floodway is to connect existing rivers and fortify its banks with concrete walls. Floodgates may also be needed to control water flow.



These are the other suggestions.



We can use the 40billion pesos allocated for the Pasig River/marikina River project to the payment of the right-of-way and relocation of the affected homes in this proposed project.

Another is pumping water into Lake Caliraya and then spilling it into the Quezon coast via the existing river system that leads to it.



Also the use of the existing canals that leads to Manila Bay by laying out large pipes that will connect Laguna Bay to the Manila Bay. We can drain Laguna Bay with this system of canals.



Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 03:45 #2

FACTS:

The Laguna de Bay Masterplan
LLDA / DENR

http://www.llda.gov.ph/masterplan.htm

The Laguna de Bay watershed region as a natural resource is strategically situated in the midst of the country’s center of urban and industrial development. Aside from Metro Manila which lies just west of Laguna de Bay, the region straddles the whole of Laguna and Rizal provinces, parts of Batangas, Cavite and Quezon which compose the CALABARZON area. This configuration makes the region a critical resource in terms of its importance as the main source of agricultural food commodities and industrial raw materials. The lake itself as well as the other smaller lakes in the basin are important sources of livelihood for the fishery sector and serve multifarious purpose - in irrigation, transportation, energy generation and other industrial uses.

The geographic features and location of the basin within the primary growth area of the country make it susceptible to destructive human interventions which in the long-term may cause irreparable damage to its resources including the loss of valuable agricultural and forest lands to urban and industrial growth.

A strategic resource of the Region is the Laguna de Bay, the second largest body of freshwater in Southeast Asia. It has a surface area of approximately 90,000 heactares, an average depth of 2.8m, a total volume of 3.2 billion cubic meters measured at elevation 11.50 meters above the Laguna de Bay datum set at 10.0 meters below the Mean Lower Low Water (MLLW) and a shoreline of 220 kms. There are 21 tributaries that drain into the lake; 35% of freshwater that drains comes from Pagsanjan River while 15% comes from the Sta. Cruz River. The only outlet of the lake is the Napindan Channel which at its confluence with the Marikina River, forms the Pasig River. This river meanders along 24-km. long course westward through a major part of Metropolitan Manila, before finally discharging into Manila Bay.

Laguna de Bay Region boundaries include six (6) provinces, 60 municipalities of which 28 towns are lakeshore and 32 non-lakeshore towns. The actual population of the Region including Metro-Manila was approximately 8.3 Million in 1990 and is expected to rise to 12.0 Million by year 2000. The lake is the singly most important resource of the Region. At present it is a source of industrial cooling water, irrigation water, and hydroelectric power; a transport route for oil products and the lakeshore dwellers; a source of snails for duck feed; a venue for recreation and most notably a source of fish supply. Also, the lake serves as a huge sink for waste coming from domestic sources (household and service sectors); non-point sources (surface run-off from urban areas, crop lans and forest lands); industries, livestock and poultry production, fishery activities and Pasig River and Manggahan Floodway inflow. The latter is most alarming since its pollution and sediment load will jeopardize the existing and potential uses of the water body.

LOCATION

Today, Laguna de Bay cover almost one half of the 190,000 ha. total area of all existing lakes in this country. It is known as the second largest inland body of water in Southeast Asia next to Lake Toba in Indonesia (Santos-Borja, 1994). It has a total surface area of about 90,000 has. and an average depth of 2.8 m. Laguna de Bay stands unique in the sense that it is right in the middle of its upper watershed. It lies just east and generally south of Metropolitan Manila. The lake has a total volume of 3.2 billion cubic meters with a shoreline of 220 km. There are 21 tributaries that drain into the lake; 35% of freshwater that drain comes from Pagsanjan River while 15% comes from Sta. Cruz River. The only outlet of the lake is the Napindan Channel which at its confluence with the Marikina river, forms the Pasig river, which meanders along a 24 km. long course westward through a major part of Metropolitan Manila, before eventually discharging into Manila Bay (Francisco, 1985). Other lakes in the region also include the Seven Crater Lakes in San Pablo City with a total surface area of 289.6 has. and Tadlak Lake in Los Baños with only 22.6 ha. area.

Laguna de Bay Region occupies 1.3% of the total land area of the Philippines. It encompasses the whole provinces of Rizal and Laguna, the cities of San Pablo, Pasay, Caloocan, Quezon, Manila and Tagaytay, the towns of Tanauan, Sto. Tomas and Malvar in Batangas, the towns of Silang and Carmona in Cavite; Lucban in Quezon province and Marikina, Pasig, Taguig, Muntinlupa and Pateros in Metro Manila. To sum it up, Laguna de Bay Region boundaries include 6 provinces, 60 municipalities of which 28 towns are lakeshore covering 177 barangays and 32 non-lakeshore towns.

Laguna de Bay is trilobate lake with three corporate bays: The West Bay, Central Bay and East Bay that converge towards the South carving out what resembles a large bird or dinosaur. The West and Central Bays are separated by Talim Island, the largest and most populated of the nine islands within the lake. It is bordered by the ruggedly high Sierra Madre mountain ranges on the Northeastern portion, the high Caliraya volcanic plateau in the East and the chains of mountains of Laguna and Batangas province to the South and Southeast, which includes Mt. Banahaw and Mt. Makiling.


HYDROLOGY OF THE LAKE

The hydrology of the lake has a natural stage regime which in the dry season results in a minimum lake elevation of about 10.5 m. controlled by mean level in Manila Bay. At the end of the dry season, the lake level may drop below the level of high tide in Manila Bay, resulting in the intrusion of seawater up the Pasig river. With this diurnal reversal, the highly polluted waters of the Pasig river system are carried in the lake. The tidal influx is also the primary cause of elevated salinity in the lake during this part of the year (Francisco, 1985).

During the wet season, precipitation results in an annual mean high water elevation of 12.5m. and a peak elevation which may reach as high as 14.6m for a 100 year recurrence interval. During extremely wet years, widespread flood damage occurs along the lakeshores because the land is relatively flat for several kilometers inland in most areas. Also during this period, the Marikina river floods the Pasig river and overflows into the Laguna de Bay via the Napindan Channel because the Marikina river can generate floodflows of about 200 m3s to 4000 m3s, and because the Pasig river bank full channel capacity varies from as little as 50 m3 to only about 750 m3s. Depending upon the tide and local inflow, the Marikina river causes flooding in and around Metropolitan Manila.


Laguna De Bay
http://en.wikipedia.org/wiki/Laguna_de_Bay

Lake Caliraya
http://en.wikipedia.org/wiki/Lake_Caliraya

Pagsanjan River
http://en.wikipedia.org/wiki/Pagsanjan_River

Sta Cruz River
http://en.wikipedia.org/wiki/Sta._Cruz_River


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 03:47 #3

Suggested PASIG RIVER IMPROVEMENT PROJECT



This photo shows the chokepoint which slows down the water flow. This incident somehow decreases the volume of water that the Pasig River can flush into Manila Bay.

Instead of safely flushing around 1000 cubic meters of water, the water is suppressed and this would result to waters breaching the banks and forcing its way into the communities, as shown by the illustration below.



The solution is to remove that choke point and maintain the speed of Pasig River at 1000 cubic meters per second.

Somehow, this will help Pasig River flush out the floodwaters more easily into the Manila Bay or at least speed up the draining floodwaters that have already breached the banks.

See photo below;



Another is improving the capacity of the channels (like in the Marikina Riverbanks/SM Marikina/Industrial Valley area) by concreting it like in the Manggahan Floodway and raising its holding capacity by building a higher wall along the banks as well.


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 03:48 #4

From: kit canillas <fxcanillas@gmail.com>
Subject: Re: [CebuPolitics] Proposed Solution to Metro Manila Floods: 2nd Floodway is needed to decongest Pasig River
Date: Thursday, October 8, 2009, 10:20 AM


Hi Alfred,

If not mistaken, there were two twelve feet in diameter pipes that were laid in the past that went through Soldiers Hills in Putatan, Muntinlupa City and not sure if across Ayala Alabang and on to Bacoor that was suppose to assist in draining Laguna de Bay.

Would you know what became of these constructed drain pipes?  Perhaps the government already has the necessary right of way for constructing a viaduct to Manila Bay.

Kit


From: kit canillas <fxcanillas@gmail.com>
Subject: Erratum - Re: Proposed Solution to Metro Manila Floods: 2nd Floodway is needed to decongest Pasig River
Date: Friday, October 9, 2009, 10:58 AM


Missed to type in the word not in mentioning the temperature require to convert plastics back to oil.. It should read, "the temperature required but it was NOT a high one..."

Forgot to mention also that sludge can be made with minimal toxic heavy metals contamination by stricter garbage segregation with mixed garbage questionable in it possible use as organic fertilzer. 

The system of zero waste management can be refined that segregation will allow most organic materials processed to make organic fertilizer and garbage not suitable for such be made as landfill for reclamation.

We would not need to import chemical fertilizers and pesticides by going organic... that of course, the money making companies involved here would probably fight these moves to the teeth.



On Thu, Oct 8, 2009 at 6:42 PM, kit canillas <fxcanillas@gmail.com> wrote:

Uncanny Alfred but I just heard news yesterday about the project with the twelve-foot high pipes was junked.

Considering the size of the lake, using pumps would be quite costly to operate.  An idea occurred that what can be done is to use nature's forces to level off the water to sea level. This can be done by constructing an underground siphon tunnel leading to Manila bay.  This way the waters of Laguna lake will level off to a bit higher than the highest sea level to prevent the saline water getting into the natural aquifers fed by Laguna de Bay, as well as the bay itself.

Remembered the film clip that was shown on discovery channel on how they constructed the tunnel connecting Great Britain and France.  The size of that tunnel can perhaps actually be enough to maintain  the bay's level to its normal state thus saving billions in relocating all those whose homes and business establishments chronically inundated. 

Such tunnel siphoning would  minimize operations cost for the system since water's intrinsic characteristic of seeking its own level is used to make the system work.

Perhaps a similar tunnel can be made instead of above ground flood ways so that water run offs can pass underground than above ground flash floods thus save the Marikina and Cainta from the cataclysmic created by such flash floods and lessen the cost of the government buying extremely unaffordable rights of way.

Not sure though on how much it would cost in constructing or even if it is technically possible without altering the aquifers along the tunnel's way.

All these though we can say are band aid solutions, as the cause of such not-ever-heard-of-before heavy downpours, as the BBC docu on 'Global Dimming' presented are the suspended carbon particles from man-caused air pollution that narrows the rain-belt width around the globe that droughts are more severe in the extreme ends of the rain belt as the sub-Saharan desertification. and in areas off southern America's and parts of Australia.  This is the crux of the problem.

Even as the flood problem is being tackled, perhaps it is more important to solve the problem of environmental  pollution most specially of global warming emission of compounds that include those of minute carbon particles.

Seems the problem was created due to lust for money.  Certain technologies are mostly kept on the lid since it can significantly reduce the incomes of the big money making giants especially in the petroleum industries.

About two decades ago (more or less since forgotten the year), the TV program
'Tomorrow Today' presented a lot of inventions and discoveries on different production systems, alternative temperature control in buildings, and waste management.

Two most significant ones were one on converting plastics back into oil and the use of waste sludge as raw material for making fibre-boards used in constructions of buildings.

The technology actually is low tech.  Converting the plastics back into oil needed only a pressure cooker type of apparatus wherein the plastics are subjected to 600 PSI pressure and I forget the temperature required but it was a high one that I forgot... sure enough, they showed the oil pouring out of a tap somewhere at the bottom of the gadget.  This technology can actually take care of all the plastic litter ubiquitously clogging our sewer and drainage systems.

The fibre-board from the sludge of bio-digested garbage on the other hand was
practically fire proof with it still not burning when heat as high as 3,000 degrees Celsius was applied to the board for more than an hour.  This though still has to be further research on in terms of the possibility of it being a possible medical hazard in the way its is handled when used, as it may contain toxic heavy metals.  Perhaps DOST can look into this.

Recently the program went on air again on NET 25 and a significant temperature control for homes and green houses showed that a low tech system that does not need too high tech expensive gadgets can be constructed out of simple daily use items as cheese clothe GI pipes and plastic sheets.

The greenhouse in fact does not even need watering as water is collected by the
temperature control system from the transpiration of the plants that actually recycles water in quite an efficient cycle.

With all these technologies discovered and invented,  makes you wonder why they have not been disseminated to benefit humanity and lessen pollution... of course there would be less volume in sales of petroleum products and the ozone depleting refrigerants.

It's good that there are now more energy efficient and relatively inexpensive
environmentally friend alternatives in the refrigeration technology with the use of propane instead of the ozone CFC's and global warming HCFC's.  The use of propane as refrigerants also cuts energy consumption by as much as 90%.

There are also heat transfer systems that in tandem serves to heat as well as to
refrigerate though such technology is not open tech but closely guarded secrets of the US, Japan and Korea.  Mentioned this as the technology actually uses 80% less energy and food products processess  through the system even retains their natural enzymes with minimal loss of nutrients and enzymes as fresh produce.

We actually can have a zero waste arrangement system that is environment friendly with no global warming gasses emitted nor any carbon particles and it's all low tech and affordable.


Kit

Kit;


Nice input.

The tunnel is possible.

As per data, and if i got it right, Laguna De Bay is at 2 meters above Manila Bay. Im not sure what's the relative elevation during high tide, nonetheless. 

What's maybe more feasible is to build a canal as wide as Mangahan Floodway in that route as illustrated by the red line in this photo.



We can also put a gate valve or floodgate at the "Manila Bay"-end of the canal to block seawater will pulled into the canal, and in turn leads to Laguna De Bay, during high tide.

We can somehow build a dam so we only allow water from Laguna Bay to flow out and block the seawater from coming in.

The meter elevation may be too low but it will still allow water to be pulled into the Manila Bay by gravity.


Also, during heavy rains, the water level in Laguna Bay will surely increase. That will increase the speed of the flow.

With this, the effect of the dam/canal/floodgate system will not be felt during normal days but once the Laguna Bay increase during heavy rains, the system is expected to work for what it was designed for.


I am just hopeful though.

I also agree on building tunnel or laying out pipes along the NAIA's runway so we can still use the ground level for other purpose like runway extension or a tarmac or parking area.

Also, we can create a similar floodgate/dam for the rivers dumpping water into the Laguna Bay.

We can divert these instead to the river system that leads to Quezon Bay.

( There are 21 tributaries that drain into the lake;  35% of  freshwater that drains comes from Pagsanjan River while 15% comes from the Sta. Cruz River.  The only outlet of the lake is the Napindan Channel which at its confluence with the Marikina River, forms the Pasig River.  This river meanders along 24-km. long course westward through a major part of Metropolitan Manila, before finally discharging into Manila Bay.)

http://www.llda.gov.ph/masterplan.htm


As for the main cause of it all, I agree on those things.

We need to implement rules in controlling the effect of global warming.

Sad thing is, we arent the biggest contributor to this mess but the US and the other big first world countries like in EU.

So, on our side, we should focus more on what we can do to control flooding.

And join forces with anti-fossil fuel, anti-CFC advocates across the globe to compel these 1st world nations to comply. 



Best regards,

Alfred Alexander Marasigan
Manila, Philippines
getflipzi@yahoo.com


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 03:49 #5

Subject: Mga Katanungan tungkol sa: PASIG RIVER IMPROVEMENT PROJECT - suggestion

From: PJRM - JMCN - SGN <pmcsi.phils@gmail.com>
Subject: Mga Katanungan tungkol sa: PASIG RIVER IMPROVEMENT PROJECT - suggestion
Date: Friday, October 9, 2009, 11:55 AM


Napakagandang mga panukala sa bandang dulo ng mahabang talakayan tungkol sa naging pinakamalubhang pagbaha sa Metro Manila at mga karatig na mga lungsod at mga munisipalidad at mga barangay ng mga Lalawigan ng Rizal, Laguna at Cavite.  Dahil ata sa haba ng talakayan ay natabunan iyong mga maituturing na mga basikong mga panglunas doon tungkol sa struktura at topograpiya ng buong lugar ng mga binaha.

Pasasaan ba at pagdating sa dulo ay haharapin ang mga tanong tungkol sa magkano ba ang kailangang gastusin at ang katumbas na tanong na mayroong bang pondo para sa mga pagpipilian na mga panukala tungkol sa panglunas.  At doon magdidikdikan kung alin nga ba ang mga realistikong mga panglunas ng siguradong sigurado na maski na ano pang panukala ay paulit ulit na mangyayari ang malubhang pagbaha.

Ang mga inhenyero mismo ang magsasabi na ang pinakamadaling panglunas ay iyong hindi gaanong gagalawin ang direksyon ng kung ano ang naging pagtakbo ng daloy ng tubig simula doon sa itaas ng kabundukan na lumandas sa kapatagan patungo doon sa dagat.  Napakadali rin namang maintindihan ng maski na hindi mga inhenyero ang prinsipyo na bago galawin ang mga tabi ay unahin muna ang pailalim.  At dito pa lang ay kitang kita agad kung ano ba talaga ang pinakasimpleng naging dahilan kung bakit umapaw ang tubig sa labas doon sa matagal ng struktura ng pagdaloy ng tubig ilog.

Samakatwid ay lulutang agad na iyong paghuhukay upang ibalik sa dating lalim at lalong palalimin ang kasalukuyang daluyan ng tubig ilog ang pinakaunang dapat gawin muna.  Hindi rin dapat iwasan maski na gaano katindi ang kontrobersiya tungkol doon sa mga naging pagharang at lalong lalo na iyong mga naging pagtabon doon sa mga natural na dinadaluyan ng tubig ilog.  Hindi dapat gulohin ang usapan ng pag-giit sa punto ng "Karapatang Pang-tao" ng mga walang lupa para pagtirikan ng mga bahay.

Kapag sinimulan agad ang paghuhukay para palalimin iyong mga kasalukuyang mga dinadaluyan ng tubig ilog ay kaagad na maiibsan simula sa baba papunta sa paitaas ang pagdaloy ng tubig ilog.  Doon pa lang kung saan dapat magsimula ay makikita kaagad kung anong kapalpakan ang mga pinagagagawa doon sa mga naunang paghuhukay para lumalim muli ang mga ilog.  Dapat na ang simula ay doon sa bungangang dulo ng dagat at hindi doon sa itaas.

Siguradong mababago ang larawan ng kung ano ba talaga ang nararapat na lunas kapag ang pagsimula ng implementasyon ay galing doon sa bungangang dulo ng dagat paitaas na kabaligtaran ng ginawang basehan na magsimula doon sa itaas ng wala pang remedyo doon sa naging natural na pagdaloy ng tubig ilog, hindi lamang dekada kung hindi ay kung ilang siglo na.

Kaya ang huling tanong ay:

Ano ang magiging kaibahan kung iyong solusyon ay magsisimula doon sa dapat na pagsimulan:  iyong bungangang dulo sa dagat paitaas?




JM

==


My answer:
JM;


Tama ang iyong sinabi na dapat din hukayin ang Pasig River.

Hindi lang ako sigurado kung mas mabuti ba na hukayin mula sa ibaba pataas or mula sa pataas paibaba.

Kasi kung sa ibaba ka magmumula ay matatabunan lang siya uli ng nahalukay na lupa mula sa itaas kapag sinimulan mo naman na hukayin ang mas mataas na parte dahil sa daloy ng tubig.

Kaya kung ako ay sa taas ako magmumula paibaba. Pero sa kin ay ideya lang naman muna sa mababaw na pang-unawa.


Sa kabuuan ay dapat na hukayin ang Pasig River kasi kung lalaki ang tubig na kaya nitong padaluyin ay mas mabilis na maitatapon sa Manila Bay ang tubig at siguradong mas mabilis na huhupa ang baha.

Ang pagkakaalam ko ay marami din na nakalubog na malilit na barko at barge sa Pasig River.

Ang Pasig River magmula sa parte ng Guadalupe at Mandaluyong ay mapapansin mo na malapad lang pero mababaw.

Malaking bagay din ang paglalagay ng sementadong wall sa gilid ng ilog mula sa Marikina hanggang sa bukana ng Manila Bay.

Ang dahilan ay mababawasan ang dami ng tubig na matutulak papasok sa mga kabahayan sa paligid ng ilog kapag mataas na ang tubig sa ilog. 


Kung maging epektibo ang lahat ng sistema (new flooodways, floodgates, pumping stations, river bank improvement) ay maaring pati ang baha ay tuluyan na mawala na nga.


Alfred Alexander Marasigan
Manila, Philippines
getflipzi@yahoo.com


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 03:50 #6

NAVOTAS UNSCATHED BY ONDOY .... and amazingly at that!

Fellows;

I've lived once in Navotas and I stayed with my relatives. Their home was situated around 50 meters away from the Navotas River. It's always flooding at about 5 centimeters deep during high tide. With what happened to Marikina and Cainta when Ondoy strucked, I got worried about my relatives there. I thought, if Cainta was in 7 feet deep, i assumed my relatives were even in a much worse situation.

Much to my surprise, when i called my cousin, he sounded okay as if nothing happened. Indeed, he said they did not experience any flooding at all. I asked him why it was so and he said that Navotas already have this flood control project.

Maybe, the people of Manila, Mandaluyong and Quezon City as well as Valenzuela can learn from Navotas.

Read more;

the infrastructure including the five pumping stations, namely: Maysilo in Kalookan; Bangkulasi, Northern Navotas and Spine in Navotas; and Catmon in Malabon have been completed by Nishimatsu Construction Co Ltd.

The pumping stations have been operational since September last year after conducting the dry-run two years ago since Navotas is already flood free.

She also commended the efforts of Navotas Mayor Toby Tiangco for making sure that their local projects would complement the flood mitigation endeavor.

At present, the department is constructing the supporting structures, the polder dikes that are elevated by 12.6 meters and in 8.6 kilometers in length.

Aside from building structures, they will also conduct river improvement works, dredging, and river widening.

Flood has been a perennial problem in the northern part of Metro Manila wherein floodwaters last for several months or even years but once the project is fully operational, it would help water to quickly subside and looking to reduce from 2.5 meters in height to just ankle level.


http://www.sunstar.com.ph/manila/kamanava-...-completed-year

Photos;

http://www.blog.crisendo.com/2009/10/navot...-typhoon-ondoy/


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 03:57 #7

It's not because of the multi-billion pesos Kamanava Flood control system but the network of 24 pumping stations set up across Navotas

- Mayor Tobi Tiangco and the City Engineer
He said all pumping stations function well for 36 hours during the height of typhoon "Ondoy."

"Gumana lahat ang pumping stations sa loob ng 36 oras, walang nag breakdown, kaya wala kaming evacuees," Tiangco said.

He even thought of announcing the opening of classes at the elementary and high school today,  Thursday, ahead of the schedule set by the Department of Education and the Commission on Higher Education, saying that almost all areas are passable.

In the past, Navotas, used to be one of the flood-prone areas, but the problem is slowly becoming a thing of the past since the pumping stations were installed in 2002.

In past years, when we were heavily hit by floods, the water subsided within 30 minutes but now it's gone in 10 minutes, Tiangco said.

"I cannot assure that Navotas would be totally flood-free, we can only say that we are doing our best to minimize flooding,” the mayor said, adding "our target is zero-flooding.”

Tiangco also cited the proper disposal of garbage, and the clean-up of all drainage and canals as factors to the free flow of water.

We see to it that esteros are cleared because even if we have the pumping stations floods will come unless they are all cleared, the mayor said.

Engr. Virgilio Cruz, assistant city engineer said, "we don't rely on the Mega flood Control Project in order to mitigate the flooding."

Cruz, said the city government has 24 bombastic pumping stations in Bangkulasi, Sipac-Almacen, Vadeo Dos, Kahunari, Daang-Hari, Babansi, Yangco, Phase-2 Area 1, Mamale, Maliputo, Bagumbayan, Tagahanan, two units at San Rafael and six at Tanza.

They two other units are also being eyed in Barangay Tanza, he said.

http://www.mb.com.ph/articles/222635/navot...ts-zeroflooding

As for me, I believe them. Look at the photo below;



As you can see the Mega project is situated far from the Navotas City proper where the "no flood" miracle happened. In fact, it's far from the mouth of Tullahan River, where the heavy volume comes from.

See this map;



A second look at the multi-billion peoso mega project though, the design seems to be okay.

See this;



The Main Pumping Station is actually a part of the whole system.

The whole area that were targetted to benefit from this project is protected by 2 gates that prevents floodwaters from other canals to flow in.

During floods, the 3 gates (in Dampalit River, Batasan River and Navotas River near C4 road) are closed to prevent floodwater from coming in and then the remaining water within the enclosed zone is pumped out into the sea by the large pumping station at the Mouth of Tangos River.

I believe this is effective (or will be effective since the project is yet to be completed)

Nonetheless, the existing pumping station is only serving the northern part of Navotas and the main part of Malabon.

The remaing southern part of Navotas is not yet protected.

Luckily, Mayor Toby Tiangco has installed his 24 "Bombastic" pumping stations across these areas.

Hopefully, when all these flood control projects are completed, Navotas will be free from floods or somewhat.

Please look back at the photo again.

The highlighted areas at the bottom are the suggested projects. This is the second mega flood control project.

The idea is to seal off Navotas River from the floodwaters coming from Tullahan River and then dumping the water from within into Manila Bay using the pumps located at the mouth of Navotas River. This is the area near the "Smokey Mountain" site.

With this, Navotas, Caloocan and Malabon (especially Navotas) will have less floods.


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
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http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 04:02 #8

Mayor Toby Tiangco's vision of Navotas;


Mayor Toby Tiangco leads the Memorandum of Agreement (MOA) signing of the contract for the proposed Reclamation and Development of the Navotas Bay Area. The said program, a P60 Billion reclamation project, will add at least 160 hectares of prime space to Navotas city to spur economic activity in this coastal section of the metropolis. In 2008, Tiangco asked Palafox Associates to design the makeover of Navotas together with Woodfields Consultants, Inc. The masterplan consists of a mixed use zone of residential and commercial sections with pocket parks including a business and other leisure centers. Joining the Mayor are (seated from left) Atty. Florencio Orendain and Ms. Vicky Pacis of the First Sea Front Renew, Inc., Vice Mayor PJ Javier. Witnessing the signing are (standing from left) City Planning and Development Officer Engr. Raffy Serrano, Mr. John Rey Tiangco of the Metro Manila Shipyard Association and Coun. Boy Vicencio.


more info about the mayor;

http://profiles.friendster.com/86612604#moreabout


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 04:04 #9

Source: PDFF

http://pdff.sytes.net/index.php?showtopic=6918&st=0

saver111 @ Oct 9 2009, 03:50 PM wrote: So, gumagana na pala yang sa Navotas. I used to live there too. Because of those floods which continuously rising yearly, we had to move. I remember that the Dagat-dagatan project was the main reason of those floodings. It used to house fishpens which was 3 meters lower than the surrounding areas of CAMANAVA. When it was reclaimed for the housing projects, it was filled up by 5 meters making the surrounding area now 2 meters below. So when it rains, water now goes to the low areas.

Before we left, a flood control project was being emplaced with equipments coming from the Netherlands, known for such flood control technology. I think the project was overrun by events after the EDSA revolution. Just like other projects of the Marcos regime, it was abandoned with parts or the equipments cannibalized or lost.

So to the energetic Mayor,  :thumb:

BTW, annual dredging of rivers during summer is a must which should also be done in the surrounding areas of Pinatubo. Make it an annual event like a fiesta where people will work hand in hand. Prevention is always the key.

Yes, Buddy. Almost all the people, from Malabon, Caloocan and Navotas can agree to that.

Before, when the areas where still filled with fishpens, there's not much flooding in Malabon and Caloocan, as well as in Navotas. The areas seemed to have been the catch basin for the floodwaters. Now, that it is gone, the floods have nowhere to go but right into their homes.

We need to bring that back. Not by destroying the houses but by improving the river systems and putting in more pumps and floodgates.


Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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21 Oct 2009, 04:04 #10

KAMANAVA - Tullahan River Flood Control Project



Another unsolved case is the Tullhan River which serves as the main drainage for Quezon City (includes Fairview, Commonwealth), Novaliches, Valenzuela, Bulacan, Malabon, and even Navotas.

The suggestion here is improvement of the river banks by buidling concrete dikes.

Another is the removal of choke points. Two possible choke points are highlighted in the image above.

Then finally the widening of the mouth on Tullahan River.

Dredging the river regularly is necessary.

Quezon City has 2 important rivers that it improve and preserve. These are the Tullahan and the San Juan Rivers. The San Juan River dumps its water into the Manila Bay via the Pasig River.



Flipzi's Cove

by Alfred Alexander L. Marasigan
Manila, Philippines
getflipzi@yahoo.com
http://z6.invisionfree.com/flipzi

" Sovereignty resides in the people and all government authority emanates from them!"

" People don't care what we know until they know we care."
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