UNDERSTANDING ECOHYDROLOGICAL CONNECTIVITY IN MULTIPLE CATCHMENTS TO CONSERVE GROUNDWATER, PROTECT SURFACE WATER AND CONTAIN RISKS IN A GLOBALIZING CITY, DAVAO CITY (PHILIPPINES)

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Description

Location

Demosite Location
Demosite Location

Sketch

Demosite Location

Information about lithology/geochemistry:

Igneous rocks mostly of intercallated and compacted volcanic breccias during the Pleistocene; alluvium in the late Holocene


Main Description

  • Davao City is one of the Philippines' most progressive cities which contains 8 watersheds. Davao, Talomo and Lipadas rivers are critical areas.
  • The coastal aquifers of Talomo and Lipadas watersheds provide 99% of the supply volume of the city’s water district which in turn serves 57% of the water consumption of the whole city. All the eight river systems are for domestic, agricultural (15,000 hectares of banana and pineapple plantations and fruit farms), and industrial uses.
  • The Davao City side of Mt. Apo Natural Park is about 11,131 ha and shared by the Lipadas, Talomo and Sibulan watersheds.

Conserve Ecohydrological processes in natural ecosystem

YES

Enhance ecohydrological processes in novel ecosystem

YES

Apply complementary Ecohydrological processes in high impacted system

YES


This table presents the different categories of ecosystem services that ecosystem can provide, divided in:

Provisioning Services are ecosystem services that describe the material or energy outputs from ecosystems. They include food, water and other resources.

Fresh water: Ecosystems play a vital role in the global hydrological cycle, as they regulate the flow and purification of water. Vegetation and forests influence the quantity of water available locally.

Regulating Services are the services that ecosystems provide by acting as regulators eg. regulating the quality of air and soil or by providing flood and disease control.
Ecosystem services "that are necessary for the production of all other ecosystem services". These include services such as nutrient recycling, primary production and soil formation.

Habitats for species: Habitats provide everything that an individual plant or animal needs to survive: food; water; and shelter. Each ecosystem provides different habitats that can be essential for a species’ lifecycle. Migratory species including birds, fish, mammals and insects all depend upon different ecosystems during their movements.

Cultural Services corresponds nonmaterial benefits people obtain from ecosystems through spiritual enrichment, cognitive development, reflection, recreation, and aesthetic experiences.

Tourism: Ecosystems and biodiversity play an important role for many kinds of tourism which in turn provides considerable economic benefits and is a vital source of income for many countries. In 2008 global earnings from tourism summed up to US$ 944 billion. Cultural and eco-tourism can also educate people about the importance of biological diversity.

Lifezones

Demosite Location
Life zone
Subtropical
Premontane
Moist Forest

Precipitation
PPT(mm/yr): 1878.0

Temperature
T(ºc): 27.0

Elevation of demosite: 6.0 meters above sea level
Humidity: Sub-Humid
PETr (by year): 0.85

EH Principles

Quantification of the hydrological processes at catchment scale and mapping the impacts

ECOHYDROLOGY ENGINEERING SOLUTIONS

To tap the Tamugan-Panigan River for drinking water, a private company was given permit by the city to construct a water treatment plant which will also be powered by its own run-of-river hydroelectric power plant

Ecohydrological Infrastructure

Major Issues

  • Soil erosion
  • Heavy siltation in rivers and Davao Gulf
  • Massive expansion of banana plantations
  • Talomo and Lipadas basins have poor health ratings with non-point sources of pollution
  • Unregulated groundwater use

Social ecohydrological system

EH Objectives

Water:
Biodiversity
Services
Resilience

EH Methodology

  • Water quality monitoring of Tamugan-Panigan River

  • Centrally-automated rainwater gauges in strategic locations

  • Capacity-building for disaster resilience

Catchment Ecohydrological sub-system

Objectives

  • To transform the current high-level of awareness into cohesive and high impact policies and programs (both in the government and civil society).

  • Stakeholders

  • Researchers (University of the Philippines Mindanao)

  • Davao City Water District

  • Watershed Management Council (Watershed Code)

  • HELP-Davao program

  • Davao River Initiative (NGOs)

  • Department of Environment and Natural Resources

  • Catchment Sociological sub-system

    Activities

    • A GIS-based profile of each of the eight river basins

    • Physical demarcation of critical areas and establishment of key monitoring sites

    • Rehabilitation of critical areas

    • Revising the Land Use Plan and the Zoning Ordinance

    Expected Outcomes

    • Groundwater and surface water are soundly-managed keeping Davao city liveable and globally competitive


    Latest Results

    • “Management Framework for Davao River” is set for public approval

    • Partial demarcation of critical areas

    • Functioning of Watershed Management Council

    • Update of “Comprehensive Land Use Plan” and revision of “Zoning Ordinance” (2013)

    • Initiation of imposing environmental tax since 2014

    Contacts

    Ruth Gamboa

    • ruthupmin@yahoo.com
    • http://www.upmin.edu.ph/
    • University of the Philippines Mindanao

    Overview

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