Archived rainfall scenario · Rainwater Collector System

Disclaimer. This site is updated as additional source documents are ingested and reviewed. Its records and calculations are preliminary and open to correction. Additional documents, stakeholder input, and independent review can surface missing information, errors, or context and improve accuracy over time; they may support more complete calculations but do not by themselves verify a record. Inviting people to examine the underlying sources and share corrections is part of the purpose of this work. These are preliminary, document-based observations, not allegations or findings that any person, office, contractor or other entity acted unlawfully. A flag, unmatched record, repeated amount or title, price or location outlier, or missing document is a prompt for review; it does not establish intent, responsibility, benefit, overpayment, duplicate scope or wrongdoing. Names and geographic or district associations indicate possible coverage only, not sponsorship, authorship, control, receipt or personal involvement. Source documents, data completeness, parsing, matching, categories, timing and boundaries may affect results. Verify cited primary records and seek relevant context before drawing or publishing conclusions.

Rainfall record · 1981–2025

Each annual value is the unweighted mean of province annual totals, calculated from complete years only. The local phl-rainfall-subnat-full.csv file supplies the rfh field; values are treated as millimetres and 36 10-day readings are summed to annual totals. This shows historical rainfall patterns, not local water demand.

Annual rainfall across provinces

Typical 10-day rainfall through the year

Province rainfall map

Fill represents average annual rainfall. Hover over a province for its long-term mean, variation, and RCS office count. The source CSV is province-level; it has no municipality observations to support a town-level rainfall estimate.

Lower rainfallMiddle rangeHigher rainfallNo matched boundary/data

Rainfall-weighted unit scenario

The model redistributes the existing district-office pool while keeping the total at 199 whole RCS units. For each province, its share of units is proportional to its 1981–2025 mean annual rainfall; that share is split across the province’s listed DPWH district offices. Largest-remainder rounding keeps the national total at exactly 199 units. Fractional model shares are shown beside the whole-unit scenario.

Current vs rainfall-weighted units by province

Allocation by province

Province	Mean annual rain (mm)	DEOs	Current units	Expected units	Suggested whole units	Change

District engineering office allocation

Rainfall vs expected RCS units for the selected offices

Each point is one district office; filter the table and this plot together.

Region	Province proxy	Geographic match	District Engineering Office	Mean annual rain (mm)	Current units	Expected units	Suggested whole units	Current allocation	Rainfall-only allocation	Change

The table assigns province-level rainfall to every DEO listed under that province. It does not assert that the DEO serves only that province or that the province average reflects its service area. One Davao Occidental office uses the Davao Region mean because neither a province rainfall series nor a local boundary is present in the workspace.

How to read this scenario

Annual rainfall depth (rfh treated as millimetres) is used as the sole weight because the request is to model a rainfall-only allocation. That is a transparent starting point for water harvesting potential. A complete needs formula should also include service population, usable roof or catchment area, storage capacity, rainfall seasonality and dry spells, water access, existing RCS sites, and construction cost. A province-level average cannot support a final district budget by itself.

Regional-office and nationwide RCS lines are shown separately from the district pool because the rainfall source cannot assign them to district service areas. They are not redistributed in this scenario.