fm-s202a-alternative flood management technologies by resito v. david

7/30/2019 FM-S202A-Alternative Flood Management Technologies by Resito v. David

http://slidepdf.com/reader/full/fm-s202a-alternative-flood-management-technologies-by-resito-v-david 1/20

Resito V. David, MNSA

Project Director

Anilao Bridge, Ormoc , Leyte

Camiguin Sabo Dam

Anilao Sabo Sliit DamMalbasag Channel Improvement, Ormoc Leyte

Department of Public Works and HighwaysFlood Control and Sabo Engineering Center

The views expressed in this paper/presentation are the views of the author and do not necessarily reflect the views orpolicies of the Asian Development Bank (ADB), or its Board of Governors, or the governments they represent. ADB does

not guarantee the accuracy of the data included in this paper/presentation and accepts no responsibility for anyconsequence of their use. Terminology used may not necessarily be consistent with ADB official terms.



Outline of Presentation

1. DPWH Structural Interventions

Flood Control and River Improvement WorksDrainage Systems and Facilities

2. Alternative Flood Mitigation TechnologiesDebris Flow Breaker

Vetiver Grass (Slope Protection)

Impounding Reservoir / Retarding Basin

Water Convergence Projects

Eco-Efficient Water Infrastructure (EEWIN)

Rainwater Harvesting Facilities



River Improvement Works

To increase the

conveyance capacities ofrivers:

Widening

Deepening / Dredging

Example of River Dredging Project



Dike / Levee

Kinanliman, Real Dike Project

Dike (sometimes called levee / embankment) is a flood

prevention structure from overflow into the low lying areas(city, important land, etc.) in order to confine the flood

discharge flow preventing the inland side from flooding.

Candaba, Pampanga Dike Project



Revetment are structures constructed on the banks to:

Protection of the collapse of riverbank due to erosion,scouring and riverbed degradation.

Directly covers the bank slope from direct attack of

floodwater, boulder and floating debris.

Revetment

Anilao River Revetment, Ormoc Leyte



Spurdike

River structures along the banks that:

Deflect or redirect river flow away from the riverbank.

Protect the banks from scouring by inducing sedimentation near banks.

Serve as flow roughness and reduce the riverflow along the bank.

Badoc River Spurdike, Narvacan, Ilocos Norte Series of Spurdikes, Region II



Groundsill

Plan Malbasag Groundsill, Ormoc Leyte

River structure that prevents riverbed degradation, stabilizes theriverbed and maintains the longitudinal and cross-sectional profiles.

Groundsill is installed across the river channel, it has drasticinfluences on the river conditions and the ecosystem of theupstream and downstream stretches.


http://slidepdf.com/reader/full/fm-s202a-alternative-flood-management-technologies-by-resito-v-david 8/20Source : DPWH MPE

↑Front view of Groundsills #1

& #2 and consolidation dam

← Groundsills # 1

↓Groundsills # 2

← Groundsills # 3

Pasig Potrero Groundsills

Pasig Potrero River Groundsills



Sediment Control (Sabo) Dams

Ormoc Slit-Type Sabo DamCamiguin Sabo Dam

To hold sediments and debris and retard flood runoff.



Drainage systems collect and carry surface runoff from collector

channels or conduits to some outlets, such as rivers or lakes.

Drainage Systems



Pumping Stations

Pumping stations are usually used and located in highlyurbanized level areas where drainage could not be achieved

successfully by gravity.

Taguig Pumping Station



Sea Wall RevetmentsSea wall revetments or levees serve as walls or embankments

to protect the shore from erosion caused by wave action.

Santa, Ilocos Sur Cagayan de Oro River



Debris Flow Breaker

Source : Matsumoto Sabo Office, MLITT



Debris Flow Breaker

Debris Flow Breaker structure was constructed at Kennon Road, Baguio City in 2008 – in association with DPWH and ICHARM and ADB



Vetiver Grass

Agno Flood Control Project (2008) Agno Flood Control Project (2010)



Impounding Reservoir / Retarding Basins



Water Convergence Projects



Eco-Efficient Water Infrastructures

Proposed new NLEX road from Commonwealth Avenue to Cabanatuan City (36km) that will collect surface runooff (114 sq.km) and generate power



Rainwater Harvesting Structures

DPWH Action Plan vs. Global Warming and Climate Change – Schemes to collect and conserve rainwater



Flood Disaster Mitigation

fm-s202a-alternative flood management technologies by resito v. david

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