Of Heat, Rot, and River: Curating the Smellscape of Metro Manila’s Esteros
Of Heat, Rot, and River: Curating the Smellscape of Metro Manila’s Esteros
Amiel Gerald A. Roldan™
El Niño is intensifying heat and dry spells across the Philippines, which accelerates organic decomposition and odor from clogged sewage canals and esteros along EDSA and the Pasig River system; immediate local actions—regular desludging, accelerated sewer connections, and community waste management—can reduce public‑health risks in Mandaluyong and neighboring barangays.
Background: El Niño and urban heat
El Niño is the warm phase of the El Niño–Southern Oscillation (ENSO) that shifts Pacific ocean‑atmosphere patterns, producing below‑normal rainfall and higher temperatures in many parts of the Philippines; PAGASA raised its alert as the phenomenon gained probability in 2026.
Drought and heat reduce river flow and evaporation patterns, concentrating pollutants and speeding microbial breakdown of organic waste—this increases odors from decomposing food, biomass, and sewage in shallow, stagnant canals.
Why canals and esteros smell worse in heat
- Lower flow and stagnation: Reduced inflow means solids and organic matter accumulate in esteros and open drains, creating anaerobic pockets that emit hydrogen sulfide and other malodorous gases.
- Higher temperatures: Heat accelerates microbial decomposition, increasing the rate of putrefaction of food waste, faecal matter, and septage.
- Inadequate wastewater infrastructure: Large parts of Metro Manila still lack sewer connections; untreated sewage and septage are discharged or dumped into canals. Investments are underway (e.g., Manila Water’s wastewater masterplan and new Mandaluyong STP), but coverage gaps remain.
Public‑health and environmental risks
- Pathogen exposure: Contaminated esteros carry fecal coliforms and emerging contaminants (endocrine disruptors detected in major rivers), raising risks of diarrheal disease and long‑term health effects.
- Air quality and nuisance: Persistent rotten‑smell reduces quality of life and can aggravate respiratory conditions.
- Ecosystem damage: Organic loading depletes dissolved oxygen, harming aquatic life and increasing eutrophication.
Practical, local actions (what Mandaluyong and barangays can do now)
- Immediate (0–30 days): regular desludging of septic tanks and canals; street sweeping and removal of food waste before it reaches drains; deploy community cleanups for visible trash. (Coordinate with barangay sanitation officers and MWSS/Maynilad.)
- Short term (1–12 months): Accelerate sewer connections for commercial establishments along EDSA and near the Pasig catchment; enforce no‑discharge rules and easement clearances.
- Medium term (1–3 years): Expand septage treatment capacity and complete planned STPs; implement source segregation and functional barangay MRFs to cut organic waste entering drains.
Policy and community priorities
- Enforce the Clean Water Act and RA 9003: LGUs must issue Notices of Violation and pursue remediation for establishments discharging untreated wastewater.
- Public education: Inform residents about proper waste disposal, reporting clogged drains, and scheduling desludging.
- Monitor and report: Use community reporting to DENR/PRCMO and barangay offices when odors or illegal discharges occur.
Conclusion
Heat from El Niño magnifies an existing infrastructure and governance problem: accumulated organic waste in shallow canals becomes a public‑health nuisance and hazard. Coordinated, enforceable actions—desludging, sewer expansion, strict discharge enforcement, and community waste control—are the most effective near‑term remedies while larger wastewater projects come online.
El Niño’s heat amplifies the stench and public‑health risks of clogged esteros and sewage canals along EDSA and the Pasig River; urgent local action—desludging, sewer connections, and enforcement of discharge laws—paired with cultural‑sector advocacy can reframe the crisis as a site for civic care and aesthetic reckoning.
Curatorial Frame
This frame treats canal odor as a material and social medium—a sensory index of infrastructural neglect, climate stress (El Niño), and uneven urban governance. It stages smell as evidence: decomposing food, septage, biomass, and trash accumulate in low‑flow esteros under heat, producing anaerobic gases and public‑health hazards. The exhibition‑as‑intervention pairs documentary mapping, community‑led desludging actions, and archival testimony to make visible the labor and policy gaps that allow such filth to persist.
Disconfirming the Alternative
An alternative claim holds that the problem is merely aesthetic or a temporary seasonal nuisance. This is insufficient: water‑quality analyses show persistent fecal contamination and poor WQI scores in the Pasig system, and institutional alerts about El Niño predict prolonged dry spells that will worsen stagnation and decomposition if unaddressed. Thus, framing the issue as ephemeral understates pathogen exposure, ecosystem collapse, and regulatory failure.
Curatorial Narrative Critique
The narrative centers on three acts: (1) Forensic Smellwalking—guided community walks that record odor intensity, sources, and lived testimony; (2) Reparative Infrastructure—partnering with barangays and water utilities to prioritize desludging, sewer hookups, and MRFs; (3) Aesthetic Translation—commissioned works that translate microbial data and smell maps into sound, scent, and installation, refusing sanitization while demanding policy. The critique interrogates the art world’s tendency to aestheticize suffering: curators must avoid voyeuristic spectacle and instead embed capacity‑building and legal advocacy (e.g., enforcement under the Clean Water Act).
Expanded Summative
The project argues that climate stress (El Niño), infrastructural deficit, and socio‑political neglect converge to produce a stench that is both symptom and signifier. Effective response requires technical remediation (desludging, STPs, sewer expansion) and cultural work that amplifies community agency, reframes odor as civic data, and pressures private and public actors to act. The curatorial program becomes a hybrid of research, direct service, and public pedagogy—measuring dissolved oxygen, fecal coliforms, and social testimony, then translating findings into policy briefs and public programs.
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Sources and Footnotes
1. PAGASA. El Niño Watch press statement, March 25, 2026.
2. Philstar / Manila Bulletin reporting on PAGASA El Niño alert, April 2026.
3. Bagtasa et al., “A Water Quality Analysis of the Pasig River,” IEICES Proceedings, 2025.
4. Africa, “Geospatial Assessment of Water Quality of Pasig River,” UP Open University, 2025.
5. DENR–MPIC Adopt‑an‑Estero partnership announcement.
Selected APA Bibliography
- Philippine Atmospheric, Geophysical and Astronomical Services Administration. (2026, March 25). El Niño Watch Press statement]. DOST‑PAGASA. [
- Laqui, I. (2026, April 22). PAGASA raises alert for possible El Niño by mid‑2026. Philstar.
- Bagtasa, M., Cucio, M., et al. (2025). A water quality analysis of the Pasig River in Manila City, Philippines. Proceedings of IEICES.
- Africa, D. R. (2025). Geospatial assessment of water quality of Pasig River using physico‑chemical parameters and WQI (Capstone). University of the Philippines Open University.
- Department of Environment and Natural Resources. (2025). DENR–MPIC Adopt‑an‑Estero MOU announcement.
Footnotes are embedded as numbered references above and correspond to the bibliography entries.
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Amiel Gerald A. Roldan™ curatorial writing practice exemplifies this path: transforming grief into infrastructure, evidence into agency, and memory into resistance. As the Philippines enters a new economic decade, such work is not peripheral—it is foundational.
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A multidisciplinary Filipino artist, poet, researcher, and cultural worker whose practice spans painting, printmaking, photography, installation, and writing. He is deeply rooted in cultural memory, postcolonial critique, and in bridging creative practice with scholarly infrastructure—building counter-archives, annotating speculative poetry like Southeast Asian manuscripts, and fostering regional solidarity through ethical art collaboration.
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Amiel Gerald A. Roldan™ started Independent Curatorial Manila™ as a nonprofit philanthropy while working for institutions simultaneously early on.
The Independent Curatorial Manila™ or ICM™ is a curatorial services and guide for emerging artists in the Philippines. It is an independent/voluntary services entity and aims to remain so. Selection is through proposal and a prerogative temporarily. Contact above for inquiries.
Furthermore, the commentary reflects my personal interpretation of publicly available data and is offered as fair comment on matters of public interest. It does not allege criminal liability or wrongdoing by any individual.
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