Water Infrastructure

Part of Phase 3: Small Group

Water Infrastructure splits into two overview clusters — Community Water System and Water Systems. Community Water System is the better-confirmed chain: its own prerequisite is just Water Purification, and five other articles name it directly as their own prerequisite in turn.

Community Water System, Deep Wells, Cisterns and Rainwater Storage, and Spring Capture cover securing a source. Each person needs at least 20 liters of water a day for drinking and hygiene, 50-80 liters for a comfortable supply with laundry included. Near a river, the water table usually sits within 3-10 meters of the surface, staying reliable through drought year-round, and filling a 20-liter bucket from a spring in 2 minutes means a yield of 14,400 liters a day, enough for 200-plus people.

Aqueducts and Channels, Water Distribution, and Flood Control and Drainage build on Community Water System directly — each names it as a real prerequisite, confirmed on both ends. An earthen channel needs a gradient of just 0.1-0.5%, enough to move water for miles with no pump at all, and a branched pipe network is cheap but fails everyone at once if the main breaks, while a looped network costs more pipe but keeps water flowing. Mapping where water collects, flows, and erodes after heavy rain shows exactly where to put drainage ditches, culverts, berms, and swales first.

Community Water Testing and Water Treatment at Scale are the last confirmed step in that chain. A turbidity tube — a clear tube 50-60 cm long with a black cross on paper behind it — is the fastest early-warning test for bad water, and serving hundreds of people needs sedimentation, slow sand filters, and chlorination run in sequence, since boiling a pot at a time doesn’t scale.

Ice Houses and Cold Storage stands alone, needing only water purification: a well-built ice house keeps ice from January to September, eight months of cold storage from one winter’s harvest of ice at least 20 cm thick.

Water Systems is the second overview, and Pipe Making, Clay Pipes, Metal Pipes, and Wooden Pipes cover what carries water once it’s moving. Fired clay pipe lasts 50-100-plus years against a bored elm log’s 15-30; a 25 mm iron pipe forge-welded from 2.5 mm strip holds 3-5 bar, above what most gravity systems actually run at, and bored wooden pipes supplied London, Boston, New York, and Philadelphia for centuries, some installed in the 1700s still working in the 20th.

Pump Construction, Hand Pumps, Ram Pump, Aqueduct Design, Channel Construction, Gradient Calculation, and Distribution Network cover moving water through those pipes. A suction pump works only to about 8 meters depth, a physics limit set by atmospheric pressure, not design, and a hydraulic ram pump lifts water uphill using only the energy of water already falling, no fuel or electricity needed. Roman aqueducts spanned over 50 kilometers on gravity alone, needing a source just 1 meter higher per kilometer of distance, and a 50 mm pipe carries about 1.0 liter per second, enough peak-hour flow for a village of 100-200 people.

Reservoir Design, Sand Filters, Settling Basins, Water Treatment, Source Development, and Well Development cover storing and cleaning what’s collected. Reservoir storage is measured in days of supply — a household cistern might hold 3 days, a village tank around 7 — and a mature slow sand filter removes 99.9-99.99% of bacteria through a living biological layer that takes 2-4 weeks to establish. Finding a source is only step one; a mistake there, like a spring that fails in the third year of drought, propagates through everything built after it.

Securing a Water Source

Four ways to get water, converging on the one article the rest of this chain depends on.

Distribution and Flood Management

Carrying water out to a settlement, and the drainage that keeps the same water from flooding it.

Testing and Treatment at Scale

Checking water quality, then treating it for hundreds of people at once instead of one pot at a time.

Cold Storage

The one use of stored water that has nothing to do with drinking it.

Ice Houses and Cold Storage

Pipes and Materials

The overview, and the four materials a water pipe actually gets built from.

Moving and Pumping Water

Pumps, gradients, and channels: the physics that gets water from source to tap.

Storage, Filtration, and Basic Treatment

Finding, storing, and cleaning water before it reaches the scale that needs a dedicated treatment chain.

Explorer