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built templategravity-sewerwith-tool

Sewer Pipe Sizing

Selects the smallest standard gravity sewer pipe diameter (per WSAA WSA 02 / AS 4130) that conveys a given design flow using Manning's equation for full-pipe capacity. Computes pipe slope from invert levels, iterates standard diameters from 150 mm to 1200 mm, and reports the full-pipe velocity and flow depth ratio for the selected pipe.

inputs

5 fields

context

4 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

5 inputs to 4 scored outputs

  • design_flow_l_s

    float

    Peak design flow entering the pipe

    0.5 to 500L/s

  • upstream_invert_m

    float

    Upstream pipe invert elevation

    0.5 to 200m AHD

  • downstream_invert_m

    float

    Downstream pipe invert elevation

    0.1 to 199.5m AHD

  • pipe_length_m

    float

    Pipe length between manholes

    10 to 200m

  • mannings_n

    floatfrom archetypehidden in hard

    Manning's roughness coefficient n

    0.009 to 0.025
selected_diameter_mmtol 0.01

Selected standard pipe internal diameter (mm)

pipe_slope_pcttol 0.03

Pipe longitudinal slope (%)

full_pipe_velocity_m_stol 0.03

Full-pipe flow velocity V (m/s)

flow_depth_ratiotol 0.05

Approximate flow depth ratio d/D (design flow / full capacity)

visibility contract

Difficulty Ladder

all_giveneasy

Small residential pipe, all parameters given, gentle slopes

all fields visible
all_givenmedium

All pipe sizes and archetypes, all parameters given

all fields visible
partialhard

Manning's n hidden, agent must infer from pipe material and site description

mannings_n

scenario bands

Archetype Atlas

residential_reticulation

3 contexts

PVC residential sewer reticulation main with small domestic flows

design_flow_l_s0.5 to 8
upstream_invert_m1 to 10
downstream_invert_m0.5 to 9.5
pipe_length_m30 to 80

brisbane-suburban-subdivision / perth-residential-infill / adelaide-greenfield-estate

subdivision_collector

3 contexts

Reinforced concrete collector sewer in a subdivision trunk network

design_flow_l_s8 to 50
upstream_invert_m2 to 20
downstream_invert_m1.5 to 19
pipe_length_m40 to 120

sydney-new-subdivision / melbourne-growth-corridor / gold-coast-mixed-density

trunk_sewer

3 contexts

Large-diameter reinforced concrete trunk sewer conveying combined catchment flows

design_flow_l_s50 to 500
upstream_invert_m5 to 50
downstream_invert_m4 to 49
pipe_length_m50 to 200

melbourne-trunk-sewer / sydney-catchment-interceptor / brisbane-major-trunk

industrial_sewer

3 contexts

Industrial gravity sewer with trade waste discharges on steep terrain

design_flow_l_s10 to 80
upstream_invert_m5 to 30
downstream_invert_m3 to 28
pipe_length_m20 to 100

darwin-industrial-estate / cairns-food-processing-zone / townsville-port-precinct

rendered task

Generation Preview

brisbane-suburban-subdivision-residential-reticulation-preview

difficulty
hard
visibility
partial
archetype
residential_reticulation
site context
brisbane-suburban-subdivision
instruction excerptsewer-pipe-sizing_calc.py

visible fields

  • design_flow_l_s0.5 to 8 L/s
  • upstream_invert_m1 to 10 m AHD
  • downstream_invert_m0.5 to 9.5 m AHD
  • pipe_length_m30 to 80 m

withheld schema

mannings_nselected_diameter_mmpipe_slope_pctfull_pipe_velocity_m_sflow_depth_ratio
PVC residential sewer reticulation main with small domestic flows. brisbane-suburban-subdivision. Required outputs: selected_diameter_mm, pipe_slope_pct, full_pipe_velocity_m_s, flow_depth_ratio