Loading Case 1 · Generalised Global Gradient hydraulics

GA Network
Optimisation Dashboard

Optimise 25 pipe diameters across the two-reservoir network, then review how cost, pressure feasibility and population diversity evolve through every generation.

25decision pipes

14demand nodes

22diameter options

Run configuration

Genetic algorithm

Population sizeGenerationsCrossover probabilityMutation probabilityPer pipe geneTournament sizeElite designsRandom seedPressure penalty ($/m)CrossoverMutation

Include supplied design in Generation 0

Ready0 / 150

Hydraulics use the supplied GGA formulation with Darcy–Weisbach resistance, 0.23 mm roughness and Loading Case 1 demands multiplied by 1.85. The minimum allowable pressure head is 19 m.

What do these GA settings mean?

Elite designs: The best designs copied unchanged into the next generation.
Uniform crossover: Each pipe diameter is independently inherited from either parent.
One-point crossover: Pipes before one cut come from one parent; the rest come from the other.
Adjacent mutation: A selected pipe moves one step up or down in the diameter list.
Random mutation: A selected pipe jumps to any available diameter.

Check a candidate design

Paste pipe diameters and evaluate

P1 to P25 order

Pipe diameters (mm)

Paste one Google Sheets column containing exactly 25 values. Units such as “600 mm” are accepted.

No design evaluated yetPaste your P1–P25 diameter column, then select Evaluate design.

Best construction cost$182,107,800Awaiting feasible design

Minimum pressure—Required ≥ 19.00 m

Feasible population—Generation 0

Population diversity—Unique pipe combinations

Best design at generation 0

Network configuration

100 mm1500 mm

Selected pipeP1

ConnectionN1 → N2

Diameter600 mm

Length6,500 m

Flow—

Velocity—

Generation history

Convergence and feasibility

Best costFeasible share

Review generation0

GenBest costMin pressureFeasible

Design schedule

Optimised pipe sizes

Supplied design

Pipe	Nodes	Length	Diameter	Unit cost
P1	1–2	6,500 m	600 mm	$2,460/m
P2	2–3	3,900 m	525 mm	$2,220/m
P3	3–4	3,900 m	450 mm	$1,800/m
P4	5–4	11,000 m	675 mm	$2,890/m
P5	2–6	3,900 m	450 mm	$1,800/m
P6	4–8	3,900 m	450 mm	$1,800/m
P7	6–7	3,900 m	300 mm	$950/m
P8	7–8	3,900 m	375 mm	$1,470/m
P9	6–9	3,900 m	450 mm	$1,800/m
P10	7–10	3,900 m	225 mm	$700/m
P11	8–11	3,900 m	375 mm	$1,470/m
P12	9–10	3,900 m	100 mm	$424/m
P13	10–11	3,900 m	100 mm	$424/m
P14	11–12	3,900 m	100 mm	$424/m
P15	10–13	4,000 m	225 mm	$700/m
P16	12–14	4,000 m	450 mm	$1,800/m
P17	13–15	3,900 m	450 mm	$1,800/m
P18	15–14	3,900 m	525 mm	$2,220/m
P19	11–15	4,000 m	525 mm	$2,220/m
P20	9–16	4,000 m	525 mm	$2,220/m
P21	16–13	3,900 m	450 mm	$1,800/m
P22	6–10	5,000 m	300 mm	$950/m
P23	8–12	5,000 m	450 mm	$1,800/m
P24	10–15	5,000 m	225 mm	$700/m
P25	3–7	3,900 m	450 mm	$1,800/m

Loading Case 1

Node pressure audit

19 m criterion

Node	Demand	Elevation	Head	Pressure
N2	70.3 L/s	320 m	—	—
N3	70.3 L/s	319 m	—	—
N4	51.8 L/s	333 m	—	—
N6	83.3 L/s	310 m	—	—
N7	138.8 L/s	312 m	—	—
N8	83.3 L/s	311 m	—	—
N9	70.3 L/s	304 m	—	—
N10	120.3 L/s	306 m	—	—
N11	83.3 L/s	311 m	—	—
N12	70.3 L/s	304 m	—	—
N13	120.3 L/s	311 m	—	—
N14	74.0 L/s	316 m	—	—
N15	83.3 L/s	308 m	—	—
N16	74.0 L/s	311 m	—	—