DEVELOPING A MODERN FLOOD PROOFING AND DRAINAGE SYSTEM

  • Published on Nov 02, 2015
  • Written by Thuy Tien - Phu Yen Newspaper

Phu Yen is one of the five provinces supported by the Technical assistance project Flood proofing and drainage for medium-sized coastal cities in Viet Nam for adaptation to climate change with ODA fund from the Federal Republic of Germany. Phu Yen Newspaper had an interview with Mr. Nguyen Van Dong – Vice Director of Department of Construction, Director of Flood proofing and drainage for Tuy Hoa Project Management Unit about that.

Could you please let us know what main activities of the FPP are?

This is a technical assistance project with main focuses on development work, capacity building, institutional development and technical assistance to prepare for project implementation such as: human resources training, equipment provision, planning, study tours, surveys, and workshops. These activities aim at achieving the objectives of urban drainage management and flood prevention in consideration of climate change. The project timeframe is from 2013 to 2018. Via this project, the cities will have detailed plan for flood proofing and drainage systems based on the existing ones. Within the project framework, trainings, workshops, drills… are organized to promote the knowledge, awareness of specialized officials and population in the sectors of urban flood proofing and drainage as well as reponding to disaster risks caused by climate change.

To date, what have been achieved?

For nearly 2 years of implementation, the FPP has implemented a considerable amount of work. In particular, the Flood proofing and drainage plan for Central Tuy Hoa city, Phu Yen province with projection to climate change up to 2025 and vision up to 2050 has been finalized and sent for MoC’s opinions before submitting for the Provincial People’s Committee’s (PPC) approval in November 2015. The drainage orientation plan for urban areas, industrial zones and parks in the province up to 2025 and vision up to 2050 has been adopted by the Provincial Appraisal Council and will be submitted for PPC’s approval in November 2015. The disaster preparedness and response planning Guideline was approved in August 2015. At present, we are identifying and preparing feasibility investment projects for flood prevention for Tuy Hoa city. The local flood early warning system will be in place in 2016.

What makes the flood proofing and drainage plan for Central Tuy Hoa city with projection to climate change to 2025, vision up to 2050 remarkable and different from the existing ones?

In terms of planning contents, the Consultants – after applying MOUSE software for hydraulic modeling – recommended new points, consisting of: installing a pumping station with capacity of 4,3m3/s at the section of Bach Dang and Pham Hong Thai streets, an automatic outlet together with an underground water tank with storage capacity of 6.000m3 at the area of Tuy Hoa market. The six existing outlets on Bach Dang Street that discharge water to Chua and Da Rang rivers will be closed as these outlets are the cause of flooding for Tuy Hoa city with back flow when the river level is high. In the meantime, a new pipe system along Bach Dang Street will be built to collect water to the foresaid pumping station. When the river level is low, storm water will not be discharged to the reservoirs but to the pumping station through the outlets. When the river level is high, water could not be discharged into the river, the water tank and the pumping station come into operation. Furthermore, Bau Ha outlet (Bach Dang Street, near Van Kiep bridge) will be fixed with automatic regulating outlets to avoid back flow into Bau Ha Canal in case of higher river level. A mobile pumping station will be installed to push water from Bau Ha Canal to the river, ensuring water not to overflow Bau Ha Canal to flood the city. At the same time, an area of 120 ha at Bau Ha Canal is maintained for water detention, recreation and algriculture.

With regard to planning, we apply the integrative approach (brand new in Viet Nam), in which the conventional drainage system is calculated to 2025, traditionally designed with pipes, reservoirs, pumping stations to cope with current rainfall. The integrated system is calculated with vision up to 2050, designed with Best Management Practices (BMP) to increase overland permeability and storage area by developing grass cover, parterre, and plants in urban areas… This method will reduce the flow speed, rainfall peak; thus reduce flooding and pressure on the conventional system, contributing to greening and ecologizing urban areas…

Thank you very much!

DEVELOPING A MODERN FLOOD PROOFING AND DRAINAGE SYSTEM

  • Published on Nov 02, 2015
  • Written by Thuy Tien - Phu Yen Newspaper

Phu Yen is one of the five provinces supported by the Technical assistance project Flood proofing and drainage for medium-sized coastal cities in Viet Nam for adaptation to climate change with ODA fund from the Federal Republic of Germany. Phu Yen Newspaper had an interview with Mr. Nguyen Van Dong – Vice Director of Department of Construction, Director of Flood proofing and drainage for Tuy Hoa Project Management Unit about that.

Could you please let us know what main activities of the FPP are?

This is a technical assistance project with main focuses on development work, capacity building, institutional development and technical assistance to prepare for project implementation such as: human resources training, equipment provision, planning, study tours, surveys, and workshops. These activities aim at achieving the objectives of urban drainage management and flood prevention in consideration of climate change. The project timeframe is from 2013 to 2018. Via this project, the cities will have detailed plan for flood proofing and drainage systems based on the existing ones. Within the project framework, trainings, workshops, drills… are organized to promote the knowledge, awareness of specialized officials and population in the sectors of urban flood proofing and drainage as well as reponding to disaster risks caused by climate change.

To date, what have been achieved?

For nearly 2 years of implementation, the FPP has implemented a considerable amount of work. In particular, the Flood proofing and drainage plan for Central Tuy Hoa city, Phu Yen province with projection to climate change up to 2025 and vision up to 2050 has been finalized and sent for MoC’s opinions before submitting for the Provincial People’s Committee’s (PPC) approval in November 2015. The drainage orientation plan for urban areas, industrial zones and parks in the province up to 2025 and vision up to 2050 has been adopted by the Provincial Appraisal Council and will be submitted for PPC’s approval in November 2015. The disaster preparedness and response planning Guideline was approved in August 2015. At present, we are identifying and preparing feasibility investment projects for flood prevention for Tuy Hoa city. The local flood early warning system will be in place in 2016.

What makes the flood proofing and drainage plan for Central Tuy Hoa city with projection to climate change to 2025, vision up to 2050 remarkable and different from the existing ones?

In terms of planning contents, the Consultants – after applying MOUSE software for hydraulic modeling – recommended new points, consisting of: installing a pumping station with capacity of 4,3m3/s at the section of Bach Dang and Pham Hong Thai streets, an automatic outlet together with an underground water tank with storage capacity of 6.000m3 at the area of Tuy Hoa market. The six existing outlets on Bach Dang Street that discharge water to Chua and Da Rang rivers will be closed as these outlets are the cause of flooding for Tuy Hoa city with back flow when the river level is high. In the meantime, a new pipe system along Bach Dang Street will be built to collect water to the foresaid pumping station. When the river level is low, storm water will not be discharged to the reservoirs but to the pumping station through the outlets. When the river level is high, water could not be discharged into the river, the water tank and the pumping station come into operation. Furthermore, Bau Ha outlet (Bach Dang Street, near Van Kiep bridge) will be fixed with automatic regulating outlets to avoid back flow into Bau Ha Canal in case of higher river level. A mobile pumping station will be installed to push water from Bau Ha Canal to the river, ensuring water not to overflow Bau Ha Canal to flood the city. At the same time, an area of 120 ha at Bau Ha Canal is maintained for water detention, recreation and algriculture.

With regard to planning, we apply the integrative approach (brand new in Viet Nam), in which the conventional drainage system is calculated to 2025, traditionally designed with pipes, reservoirs, pumping stations to cope with current rainfall. The integrated system is calculated with vision up to 2050, designed with Best Management Practices (BMP) to increase overland permeability and storage area by developing grass cover, parterre, and plants in urban areas… This method will reduce the flow speed, rainfall peak; thus reduce flooding and pressure on the conventional system, contributing to greening and ecologizing urban areas…

Thank you very much!

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