Infra-structures to alleviate the perennial Flooding east Ml
Infra-structures to alleviate the perennial Flooding of Eastern Metro Manila and the Low Areas around Laguna de Bay To a lot of people this may sound like a post –mortem analysis, or another “know-it-all” suggestion, but I would like this to be discussed and hopefully be implemented, to be able to mitigate the recurring problems brought about by flooding. All the areas that were flooded in metro Manila and the surrounding areas are actually part of the original flood plains, former low lying agricultural areas, or artificially dammed areas that were a result of haphazard and piece-meal planning and development. Presently these areas are primarily used for residential area as well as small commercial and industrial sites. Specific Proposals to alleviate Flooding: A. Marikina river banks, the river overflows it’s banks, because the capacity of the present river cross-section, is not capable of holding excessive water volume coming in at high velocity, from parts of Quezon City, Montalban and San Mateo. 1. Clear all ground water storm drains, to facilitate the flow of run-off from street drains to main drains; this will prevent isolated ponding and flooding. 2. De-silting and dredging the river bed, excavated materials can form new embankment materials to protect critical areas. 3. Identify high water mark level along the river banks and clear the flood plain of housing structures. 4. Add additional height to existing levees, taking into account the new high water level mark. 5. Construct a Storm drain catch basin and construct a 3,020 meter underground storm drain aqueduct, with hydraulic gates to divert above normal volume of floodwater from Marikina River directly to Manggahan Floodway. Starting From Fernando Ave. and M Roxas St, to East Bank Rd of the Manggahan Floodway. Starting at 14deg37min26.3sec N, 121deg05min35.33secE and ending at 14deg35min49.47sec N, 121deg05min29.21secE. 6. A suitable section for this is a double-O-tunnel, similar to shielded tunnels used in Japan. 7. The purpose of this out fall is to prevent the build up of water volume as the Marikina River meanders around the vicinity of Provident Village, this will minimize the flooding of the riverbanks affecting communities on the upstream of the river. This will also hasten the discharge of the municipal storm drain in to the Marikina River, preventing floods within the city. B.. Cainta Area, from Vista Verde, Village East to Ortigas including Sta. Lucia , De Castro in Pasig. Flood water inundating this area comes from the hills of Antipolo and Cogeo. There are two streams intersecting near the vicinity of Vista Verde and converging to exit to Cainta River then to the Manggahan Floodway. 1. Create a Storm drain catch basin structure consisting of circular structures, near the Vista Verde gate and construct a 2, 295 meter long underground storm tunnel to drain the excessive run-off directly to the Manggahan floodway. Starting at 14deg35min47sec N, 121deg06min42secE and ending at 14deg34min53sec N, 121deg05min50secE. 2. Another out fall can be constructed at a vacant lot near Ever Gotesco to dovetail with this aqueduct. to catch excess run-off along Ortigas extension. 3. Another outfall can be constructed in near Tramo st., in Bgy. Sta. Lucia, at the back of the former Pricemart to also dovetail with this big aqueduct. This will catch the run-off of Sta. Lucia and De Castro areas. 4. Widen the existing Cainta creeks, by demolishing illegal structures and reclaim the legal easement. Dredge the bottom to accommodate a bigger volume of run –off and minimize the overflowing of the creek banks. C.. Manggahan Floodway, will eventually divert bigger volume of water at a higher velocity coming from the proposed Storm tunnels from Marikina river and the Cainta area, therefore all informal settlers along the floodway banks and flood level mark have to be removed, starting from Tramo st up to Laguna Lake. 1. Continue the concreting of the embankments at both sides of the floodway. 2. Pasig , Cainta and Taytay LGU’s must remove all informal settlers within the banks of the floodway . 3. Continuous dredging and de silting of the waterway, especially on the approach to the lake, so as not create a shallow delta like region that will impede the flow of water as it empties towards the lake. D. Pasig areas of Green park, Rainforest, Mercedes and Areas of Cainta , including Greenwoods and Sandoval Ave. The construction of the embankments of the Manggahan Floodway prevented the run-off from taking it’s natural course, hence concentrating the volume on a few remaining natural creeks that drains towards the periphery of the floodway towards the parola Area. 1. Create Storm drain outfall, to act as area collector and install large capacity submersible pump to drain the water directly to the Manggahan floodway. 2. This storm drain outfall will be constructed of circular structures, 100 meters diameter and 20 meters deep each, with approximate volume of 157,000 c.m. each. The walls will be constructed initially using bored piles. The number of circular chambers will depend on the size of the tributary area to be served. One chamber can serve approximately 50 hectares. 3. One proposed location for this is opposite the Pasig City General Hospital, for the areas in the vicinity of Parkwood, Jenny’s Ave, Rainforest and portions of Mercedes Ave. 4. Another location is the area North of Huckleberry and Turpentine St. inside Greenwoods Subdivision. E. Pasig Area From Mercedes to Market Ave to Pinagbuhatan. The water run-off in this area normally drains towards Marikina river, however earlier developments near the river have raised the land elevation such that excess run-off now tend to converge towards an existing creek from Palatiw to San Jose, but this is now constricted by new developments at the town center. The water now partly bypass this area and flows to Palatiw creek area near Republic Asahi plant then to Napindan River. A potion of the water flows towards Marrket ave, to smalll creeks in Pinagbuhatan and Bambang area, that empties to Napindan river. 1. Create Storm drain outfall, to act as area collector and install large capacity submersible pump to drain the water directly to the Napindan River. 2. This storm drain outfall will be constructed of Circular structures, 100 meters diameter and 20 meters deep each, with approximate volume of 157,000 c.m. each. The walls will be constructed initially using bored piles. The number of circular chambers will depend on the size of the tributary area to be served. One chamber can serve approximately 50 hectares. 3. The first location is at a vacant lot bounded by Sandoval ave and a creek near the Republic glass area. This will take care of the run-off from Sandoval, Palatiw area. 4. Another location is the area bounded by Balderama st,, U.Velasco St. and Acaccia lane. This will take care of the run-off from the City hall and market area. 5. Another location in the vicinity of JV Miguel and F Manalo, this will take care of the run-off from F.Manalo and Bambang area. F. Cainta and Taytay Area part of Greenwoods, San Juan , Nagpayong in Pasig along Sandoval ave and Ejercito Ave . this is approximately 1,000,000 sq. meters.The excess runoff is coming from Mercedes area, Greenwoods and river bank roads and the surface run –off in the general area. 1. Basically since this is a relocation area, there exist a limited underground storm drain and functioning drainage system. Most of the water are surface run-off collecting at low areas and remains stagnant until it can move to lower level and finally drain-off. 2. Invest in the planning and construction of integrated above ground and underground storm drain system. 3. Provide storm drain outfall similar to previous proposal if and when the budget permits. This storm drain outfall will be constructed of Circular structures, 100 meters diameter and 20 meters deep each, with approximate volume of 157,000 c.m. each. The walls will be constructed initially using bored piles. The number of circular chambers will depend on the size of the tributary area to be served. One chamber can serve approximately 50 hectares. 4. Create a Baranggay Disaster and Rescue Center, an elevated structure that can store relief goods, rescue paraphernalia and can act as interim evacuation center. 5. Interim solution is to station shallow draft water craft, amphibious vehicles, and lifeboats within the area for contingencies. 6. Improvised collapsible gangplanks made of bamboo can also be fabricated and stored at the Barrangay rescue center for future contingencies. G. Areas surrounding the Laguna de Bay that are flooded when the water level of the lake rises, due to the added load from Manggahan floodway. The only outlet of the lake to Manila bay is through the Napindan river and then to the Pasig river, this is a meandering circuitous route of about 22 km. Flood control structures at Napindan and Buting further constricts the flow of water going out, resulting to flooding of the banks and causing considerable drainage time. 1. Create an alternative spillway towards the Manila Bay, by constructing a 100 meter wide channel, within a 200 meter wide right of way corridor from Lower Bicutan towards Better Living, Multinational area and ending at the Manila Bay. 2. The cost of the spillway including the right of way acquisition is about 15 Billion Pesos or USD 312M. Estimated time for planning up turnover is 48 months. 3. The spillway will have an approximate length of 8, 500 meters. Starting at coordinate, 14deg29min 36.28 sec N, 120deg 29 min 08.55 sec E to 14deg28min 31.36 sec N, 121deg 03 min 45.96 sec E. 4. An alternative to the open type spillway is to construct parallel double-O-tube tunnels underground, with the same capacity as the open type spillway, the right of way required for this is approximately 100 meters wide .The top lots above the tunnels can be used as anew radial road connecting Roxas Blvd. to the south expressway area and to the C-6 area. This alternative may be less expensive and socially acceptable , since this requires less private lands to be expropriated. 5. Storm Drainage system of Pasay, Paranaque can dovetail into this spillway. 6. Excavated material of approximately 3 Million c.m. can be used to reclaim additional area along the shore of the Lake to create an embankment that can also be an extension of C-6 towards Muntinglupa and San Pedro area onwards. 7. Continuous silting of the lake necessitates the dredging of the Laguna de Bay . This should be a continuing activity, excavated materials of approximately 70 Million cu. meters, should be used to create an embankment along the 140 km. . Circumference of the lake, that could also be developed into a 30M wide R.O.W. , for a ring road around the lake. This make take some time, maybe 15 years, succeeding administration must commit to finish this project.
Infra-structures to alleviate the perennial Flooding of Eastern Metro Manila and the Low Areas around Laguna de Bay To a lot of people this may sound like a post –mortem analysis, or another “know-it-all” suggestion, but I would like this to be discussed and hopefully be implemented, to be able to mitigate the recurring problems brought about by flooding. All the areas that were flooded in metro Manila and the surrounding areas are actually part of the original flood plains, former low lying agricultural areas, or artificially dammed areas that were a result of haphazard and piece-meal planning and development. Presently these areas are primarily used for residential area as well as small commercial and industrial sites. Specific Proposals to alleviate Flooding: A. Marikina river banks, the river overflows it’s banks, because the capacity of the present river cross-section, is not capable of holding excessive water volume coming in at high velocity, from parts of Quezon City, Montalban and San Mateo. 1. Clear all ground water storm drains, to facilitate the flow of run-off from street drains to main drains; this will prevent isolated ponding and flooding. 2. De-silting and dredging the river bed, excavated materials can form new embankment materials to protect critical areas. 3. Identify high water mark level along the river banks and clear the flood plain of housing structures. 4. Add additional height to existing levees, taking into account the new high water level mark. 5. Construct a Storm drain catch basin and construct a 3,020 meter underground storm drain aqueduct, with hydraulic gates to divert above normal volume of floodwater from Marikina River directly to Manggahan Floodway. Starting From Fernando Ave. and M Roxas St, to East Bank Rd of the Manggahan Floodway. Starting at 14deg37min26.3sec N, 121deg05min35.33secE and ending at 14deg35min49.47sec N, 121deg05min29.21secE. 6. A suitable section for this is a double-O-tunnel, similar to shielded tunnels used in Japan. 7. The purpose of this out fall is to prevent the build up of water volume as the Marikina River meanders around the vicinity of Provident Village, this will minimize the flooding of the riverbanks affecting communities on the upstream of the river. This will also hasten the discharge of the municipal storm drain in to the Marikina River, preventing floods within the city. B.. Cainta Area, from Vista Verde, Village East to Ortigas including Sta. Lucia , De Castro in Pasig. Flood water inundating this area comes from the hills of Antipolo and Cogeo. There are two streams intersecting near the vicinity of Vista Verde and converging to exit to Cainta River then to the Manggahan Floodway. 1. Create a Storm drain catch basin structure consisting of circular structures, near the Vista Verde gate and construct a 2, 295 meter long underground storm tunnel to drain the excessive run-off directly to the Manggahan floodway. Starting at 14deg35min47sec N, 121deg06min42secE and ending at 14deg34min53sec N, 121deg05min50secE. 2. Another out fall can be constructed at a vacant lot near Ever Gotesco to dovetail with this aqueduct. to catch excess run-off along Ortigas extension. 3. Another outfall can be constructed in near Tramo st., in Bgy. Sta. Lucia, at the back of the former Pricemart to also dovetail with this big aqueduct. This will catch the run-off of Sta. Lucia and De Castro areas. 4. Widen the existing Cainta creeks, by demolishing illegal structures and reclaim the legal easement. Dredge the bottom to accommodate a bigger volume of run –off and minimize the overflowing of the creek banks. C.. Manggahan Floodway, will eventually divert bigger volume of water at a higher velocity coming from the proposed Storm tunnels from Marikina river and the Cainta area, therefore all informal settlers along the floodway banks and flood level mark have to be removed, starting from Tramo st up to Laguna Lake. 1. Continue the concreting of the embankments at both sides of the floodway. 2. Pasig , Cainta and Taytay LGU’s must remove all informal settlers within the banks of the floodway . 3. Continuous dredging and de silting of the waterway, especially on the approach to the lake, so as not create a shallow delta like region that will impede the flow of water as it empties towards the lake. D. Pasig areas of Green park, Rainforest, Mercedes and Areas of Cainta , including Greenwoods and Sandoval Ave. The construction of the embankments of the Manggahan Floodway prevented the run-off from taking it’s natural course, hence concentrating the volume on a few remaining natural creeks that drains towards the periphery of the floodway towards the parola Area. 1. Create Storm drain outfall, to act as area collector and install large capacity submersible pump to drain the water directly to the Manggahan floodway. 2. This storm drain outfall will be constructed of circular structures, 100 meters diameter and 20 meters deep each, with approximate volume of 157,000 c.m. each. The walls will be constructed initially using bored piles. The number of circular chambers will depend on the size of the tributary area to be served. One chamber can serve approximately 50 hectares. 3. One proposed location for this is opposite the Pasig City General Hospital, for the areas in the vicinity of Parkwood, Jenny’s Ave, Rainforest and portions of Mercedes Ave. 4. Another location is the area North of Huckleberry and Turpentine St. inside Greenwoods Subdivision. E. Pasig Area From Mercedes to Market Ave to Pinagbuhatan. The water run-off in this area normally drains towards Marikina river, however earlier developments near the river have raised the land elevation such that excess run-off now tend to converge towards an existing creek from Palatiw to San Jose, but this is now constricted by new developments at the town center. The water now partly bypass this area and flows to Palatiw creek area near Republic Asahi plant then to Napindan River. A potion of the water flows towards Marrket ave, to smalll creeks in Pinagbuhatan and Bambang area, that empties to Napindan river. 1. Create Storm drain outfall, to act as area collector and install large capacity submersible pump to drain the water directly to the Napindan River. 2. This storm drain outfall will be constructed of Circular structures, 100 meters diameter and 20 meters deep each, with approximate volume of 157,000 c.m. each. The walls will be constructed initially using bored piles. The number of circular chambers will depend on the size of the tributary area to be served. One chamber can serve approximately 50 hectares. 3. The first location is at a vacant lot bounded by Sandoval ave and a creek near the Republic glass area. This will take care of the run-off from Sandoval, Palatiw area. 4. Another location is the area bounded by Balderama st,, U.Velasco St. and Acaccia lane. This will take care of the run-off from the City hall and market area. 5. Another location in the vicinity of JV Miguel and F Manalo, this will take care of the run-off from F.Manalo and Bambang area. F. Cainta and Taytay Area part of Greenwoods, San Juan , Nagpayong in Pasig along Sandoval ave and Ejercito Ave . this is approximately 1,000,000 sq. meters.The excess runoff is coming from Mercedes area, Greenwoods and river bank roads and the surface run –off in the general area. 1. Basically since this is a relocation area, there exist a limited underground storm drain and functioning drainage system. Most of the water are surface run-off collecting at low areas and remains stagnant until it can move to lower level and finally drain-off. 2. Invest in the planning and construction of integrated above ground and underground storm drain system. 3. Provide storm drain outfall similar to previous proposal if and when the budget permits. This storm drain outfall will be constructed of Circular structures, 100 meters diameter and 20 meters deep each, with approximate volume of 157,000 c.m. each. The walls will be constructed initially using bored piles. The number of circular chambers will depend on the size of the tributary area to be served. One chamber can serve approximately 50 hectares. 4. Create a Baranggay Disaster and Rescue Center, an elevated structure that can store relief goods, rescue paraphernalia and can act as interim evacuation center. 5. Interim solution is to station shallow draft water craft, amphibious vehicles, and lifeboats within the area for contingencies. 6. Improvised collapsible gangplanks made of bamboo can also be fabricated and stored at the Barrangay rescue center for future contingencies. G. Areas surrounding the Laguna de Bay that are flooded when the water level of the lake rises, due to the added load from Manggahan floodway. The only outlet of the lake to Manila bay is through the Napindan river and then to the Pasig river, this is a meandering circuitous route of about 22 km. Flood control structures at Napindan and Buting further constricts the flow of water going out, resulting to flooding of the banks and causing considerable drainage time. 1. Create an alternative spillway towards the Manila Bay, by constructing a 100 meter wide channel, within a 200 meter wide right of way corridor from Lower Bicutan towards Better Living, Multinational area and ending at the Manila Bay. 2. The cost of the spillway including the right of way acquisition is about 15 Billion Pesos or USD 312M. Estimated time for planning up turnover is 48 months. 3. The spillway will have an approximate length of 8, 500 meters. Starting at coordinate, 14deg29min 36.28 sec N, 120deg 29 min 08.55 sec E to 14deg28min 31.36 sec N, 121deg 03 min 45.96 sec E. 4. An alternative to the open type spillway is to construct parallel double-O-tube tunnels underground, with the same capacity as the open type spillway, the right of way required for this is approximately 100 meters wide .The top lots above the tunnels can be used as anew radial road connecting Roxas Blvd. to the south expressway area and to the C-6 area. This alternative may be less expensive and socially acceptable , since this requires less private lands to be expropriated. 5. Storm Drainage system of Pasay, Paranaque can dovetail into this spillway. 6. Excavated material of approximately 3 Million c.m. can be used to reclaim additional area along the shore of the Lake to create an embankment that can also be an extension of C-6 towards Muntinglupa and San Pedro area onwards. 7. Continuous silting of the lake necessitates the dredging of the Laguna de Bay . This should be a continuing activity, excavated materials of approximately 70 Million cu. meters, should be used to create an embankment along the 140 km. . Circumference of the lake, that could also be developed into a 30M wide R.O.W. , for a ring road around the lake. This make take some time, maybe 15 years, succeeding administration must commit to finish this project.