ŻUŁAWY / W–4

Understanding the waterworks

Rainwater gathers in a low polder. A wind-driven pump lifts it into a higher collector channel. The non-return sluice discharges water to the river when the collector level exceeds river stage. High river water prevents gravity outflow.

This is a simplified teaching model inspired by the Żuławy Wiślane drainage landscape. Buildings, performance coefficients, and hydraulic geometry are interpretive—not surveyed historical infrastructure.