I did not know there was an Agdao River (it is now a canal) and a Ma-a Spring (only the village remained) until I moderated Davao Historical Society’s (DHS) Earth Month Throwback Thursday episode last April 30, 2026 at SM City Davao.
April, being Earth Month, DHS wanted to focus on the Davao River, a tangible cultural heritage of the city. The title of the Throwback Thursday event was “Davao River: Water, Heritage, and Conservation” and two resource speakers led the conversation — environmental planner Lemuel Lloyd Manalo of the Interfacing Development Interventions for Sustainability (IDIS) and JC Duhaylungsod, spokesperson of the Davao City Water District (DCWD).
Lemuel did a study, “Urban Wetland Loss as a Climate Vulnerability: Land Use Change and Flood Risk in Davao City,” which aimed to know the historical land-use changes and current wetlands in Davao City. It traced the history of Davao City’s natural landscape, wetlands, and early settlement.
He was the one who emphasized the importance of understanding history in planning a development of a place and ensuring sustainability. And that idea shifted my thinking of the Davao River and our city’s water resources as mere natural resources. I think of them now as a fundamental part of human history, community identity, and cultural heritage.
While the term “tangible cultural heritage” often conjures images of monuments, artifacts, and historic buildings, the reality is that rivers, lakes, springs, and the intricate systems built to manage water are equally valid and vital forms of tangible heritage.
The Davao River and the DCWD offer a compelling case study of this principle, illustrating how a water source embodies layers of history — from indigenous settlements and colonial transformation to the tangible infrastructure of aqueducts, wells, and innovative bulk water projects.
While rivers might be considered natural heritage, UNESCO noted that “water heritage” encompasses the lasting physical traces of the human-water relationship. This includes not just natural features but also the built infrastructure like wells, dams, irrigation canals, and ancient water systems that communities have built and transmitted across generations.
The history of the Davao River is an eloquent argument for its status as a tangible cultural heritage. The river’s primal importance is deeply embedded in the traditions of our indigenous peoples. Its indigenous name “Davao” itself came from the phonetic blending of words from three Bagobo subgroups. The Tagabawa tribe called it “Dabu;” the Guiangan tribe called it “Duhwow;” and the Obo tribe called it “Davoh.”
Over time, these three names fused to form the river’s present name. This area was ruled by the powerful Datu Bago, who established his capital on the river’s banks around 1830, which eventually grew into a major settlement and trading port in the region. It prospered as a trading port because it worked with, not against, the waterway.
The Davao River was not merely a geographic feature. It was the organizing principle of society, political networks, and identity. This “riverscape” was a tangible, physical space where life unfolded, and early Davaoeño settlements and identities were conceptualized according to the river on which people dwelt. These intangible connections are mirrored in the tangible layout of pre-colonial settlements, pathways, and resource zones along the river.
For our indigenous peoples, the Davao River was not just a resource, it was an ancestor — a living entity with its own spirit and will. They identified as “river people” who trace their lineage not just to human forebears but to the river’s bends, its rapids, and its floods. Oral epics like “Tuwaang” recount journeys along waterways, embedding the river into the very grammar of identity. The river gave them their name and their orientation in the world.
In this worldview, the river is a tangible cultural heritage — a physical space where offerings are made, where rituals mark life passages, and where the dead are sometimes entrusted to the current. To harm the river is to harm oneself, because the boundary between human and river is permeable.
The Spanish colonial period added new tangible layers to this heritage. When Spanish forces led by Don Jose Cruz de Oyanguren defeated Datu Bago in 1848, they founded Nueva Vergara (the future Davao City) on the south bank without fully inheriting indigenous hydrological knowledge. This disconnect marked the beginning of a pattern — development decisions made without historical memory that would later produce recurring crises.
One striking example is the river’s altered course. Historical maps from the 1940s show that the Davao River once followed a different channel, which was later abandoned for urban expansion. Decades later, subdivisions like Jade Valley were built directly on the old riverbed. During heavy rains, the river naturally tries to reclaim its ancestral path, resulting in catastrophic flooding.
The most destructive flood on record was in 1916 which destroyed the main bridge and vast plantations. More recently, the 2011 flood claimed 30 lives and the 2013 flood displaced 40,000 residents. These tragedies were not random acts of nature. They were the predictable consequences of ignoring the river’s historical behavior. As the adage goes, the river remembers.
Similarly, the evolution of the DCWD offers a cautionary tale and a hopeful model. It was established in 1973 under Presidential Decree 198, one of the first water districts in the Philippines. For decades, it relied almost exclusively on groundwater extraction — a solution that worked admirably in the short term.
Fortunately, DCWD’s leadership recognized the warning signs. Informed by hydrological studies and knowledge of past groundwater collapses in other coastal cities, they found an alternative. This led to the Davao City Bulk Water Supply Project, a landmark public-private partnership with Apo Agua Infrastructure, Inc. Tapping the Tamugan and Panigan Rivers — tributaries of the Davao River — the facility now produces over 300 million liters per day, serving over one million residents. It is the first in Southeast Asia to use a water-energy nexus concept, with a run-of-river hydroelectric plant powering the treatment process.
The Panigan-Tamugan Watershed was officially declared a protected area — a direct legislative acknowledgment that historical overuse required a legal remedy.
Today, Davaoeños enjoy an abundant supply of the “best water in the world” because DCWD has a clear-eyed reading of history. It studies the aquifer’s long-term decline, learned from other cities that had exhausted their groundwater, and acted before irreversible collapse could occur.
In contrast, the repeated flooding along the Davao River persists because developers and planners forgot — or chose to ignore — the river’s ancient channel. Sustainability, therefore, is not merely about technology or regulations; it is about historical literacy.
Sustainability is a discipline of remembrance. When we treat memory as an active, daily practice of comparing present to past, and when we build institutions that cannot easily forget, we stop lurching from crisis to crisis. Instead, we walk forward with eyes open, carrying the lessons of the river, the city, and the people who came before. Memory, when honored, becomes the most durable technology we have.
