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Pilot Impact Logic

Measured as demand reduction.

RainBank's impact is estimated by how much non-potable water demand can shift away from groundwater pumping, informal vendors, and unmanaged runoff.

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Per Hub Model

One hub. Six outcomes.

0k L

theoretical usable collection from a 300m² roof per year

Per-hub model · 2,000mm rainfall × 75% efficiency

0

households partially served per hub, depending on demand and storage

Pilot assumption · 50–100 households

0%

potential discount versus selected informal non-potable water purchases

Scenario estimate · pricing depends on local vendor rates

0 jobs

local roles linked to operation, maintenance, and distribution

Pilot assumption · role count depends on hub size

0k L

maximum annual groundwater demand offset if collected rainwater replaces pumped water

Conservative projection · actual displacement must be measured

0

projected capital recovery window under pilot assumptions

Pilot assumption · 20–30 months

The Three Pillars

Social, economic and environmental impact.

01

Social Impact

More reliable access for washing, cleaning and sanitation can reduce pressure on households that currently rely on vendors or groundwater pumps for basic daily needs.

  • Affordable non-potable water access
  • Reduced dependence on informal vendors
  • Community-managed infrastructure
02

Economic Impact

The model targets lower costs for selected water uses, local operator income, and a maintenance reserve before any expansion is considered.

  • Lower cost for selected water uses
  • Operator income from hub revenue
  • Surplus reinvested into maintenance and expansion
03

Environmental Impact

RainBank captures rainfall locally and uses it to reduce groundwater demand for non-potable tasks. This supports aquifer protection and reduces runoff during rain events.

  • Groundwater demand reduction
  • Local floodwater capture
  • Reduced stress on aquifers
Life Before and After

What changes for selected daily water uses.

Before RainBank

01
2–4 hours/day

collecting water from distant vendors or standpipes. Mostly women and girls.

02
Rp 130–200/litre

from informal vendors. Up to 30% of household income spent on water.

03
No reliable alternative

fully dependent on informal vendors for bathing, washing, and sanitation water — no fallback when prices spike or supply dries up.

04
No control

vendor prices fluctuate. Dry season sees price spikes of up to 50%. Families have no alternative.

After RainBank

01
Shorter collection trip

Water is collected from a local refill point during normal daily movement.

02
Lower selected-use cost

Membership or pay-per-fill pricing can reduce spend on washing, cleaning, and sanitation water where vendor prices are high.

03
Safe for non-potable household use

Settled and filtered water is intended for bathing, washing, cleaning, toilet flushing, and community facility use.

04
Community managed

The host institution and operator manage access, maintenance logs, and pricing transparency.

Scale Vision

A 50-hub scenario by Year 5.

Scenario-based projection: 50 hubs across North and Central Jakarta's most underserved kampungs by Year 5. The network effect makes each new hub cheaper and faster to build.

0

people with partial non-potable water access

Scenario-based projection

0 jobs

created within communities

Scenario estimate · 3 roles per hub × 50 hubs

0M L

groundwater not pumped per year

450kL × 50 hubs · conservative projection

RainBank hub visualisation
Community Ownership

Built and managed with the community.

Every RainBank Hub is co-built with the community it serves. The mosque or school that hosts the hub receives a share of monthly revenue — ensuring long-term institutional buy-in.

Community members are involved in monitoring from day one. Monthly service reports are posted publicly at the hub, including water collected, water distributed, maintenance, and any bulk-water support.

After capital recovery, surplus remains with the community for maintenance, operator continuity, school or mosque needs, or expansion. The exact allocation is part of the pilot governance model.

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What's Next

Want to be part of this?

The next step is a pilot with a host institution, community operator, and transparent measurement of water collected, water distributed, and groundwater demand offset.

Discuss a pilot