Water distribution skill

The Water skill turns Nexma into a pressurized water-network design platform. It models treatment-to-customer flow, validates pressure budgets, and sizes pumps under elevation.

What it covers

• Entities. TreatmentPlant, PumpStation, StorageTank, Valve, Hydrant,

Meter, PressureSensor, PressureZone. Each carries typed properties (flow rate, static head, valve class, meter size).

• Relationships. TransmissionMain, DistributionMain, ServicePipe. Pipes carry

diameter, material, roughness coefficient, and design pressure.

• Constraints. Minimum 40 PSI at meters, maximum 60 PSI in distribution mains, flow

conservation at every junction, valve isolation segments must remain reachable.

• Constants. AWWA pipe class tables, Hazen-Williams roughness coefficients per

material, standard hydrant flow ratings, pressure-zone elevation bands.

• Layer config. Treatment plants render as 3D extruded sites, tanks as scaled

cylinders, mains as thickness-graded lines colored by pressure class.

• Toolbar tools. Generate distribution layout, place hydrants on a coverage grid,

size pumps from elevation difference, run pressure simulation.

Typical workflow

1. Scope. Draw a service polygon — typically a pressure zone or a municipal sub-area.
2. Sources. Place a treatment plant or import an existing source. Tanks and pumps

follow.

1. Generate. Ask Jax: "Lay distribution mains to every parcel in this polygon. Hold

pressure ≥45 PSI everywhere. Use 8-inch DI mains on collectors, 6-inch on locals."

1. Inspect. Hover mains for diameter and pressure class; click meters for

simulated pressure under design demand.

1. Refine. Move tanks, resize pumps, swap pipe class — Jax re-runs the pressure

simulation in seconds.

1. Validate. Run the pressure-drop solver across the full distribution graph. Any

over-budget paths are flagged inline.

1. Export. GeoJSON, EPANET INP, or shapefile from Project → Export.

What Jax is good at, in Water specifically

• Pressure-budget validation across long branches and multiple pressure zones.
• Pump sizing under elevation difference, including head-loss for fittings.
• Hydrant coverage with adjustable spacing rules per land-use class.
• Valve placement for isolation segments small enough to repair without major

service interruption.

Standards

AWWA pipe classes, ANSI/AWWA C150 ductile-iron sizing, Ten States Standards for distribution design.

What it does not do (yet)

• Wastewater/stormwater (separate skill, planned).
• Real-time SCADA integration — read-only operational dashboards only.
• Detailed cathodic protection design.