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task library
built templategravity-sewerwith-tool

Sewer Slope Check

Verifies that a gravity sewer pipe's installed slope produces a full-pipe velocity within the self-cleansing range (0.6-4.0 m/s) required by WSAA WSA 02. Uses Manning's equation V = (1/n)*R_h^(2/3)*S^(1/2) for a circular pipe at full flow to compute velocity and capacity, then reports compliance status.

inputs

3 fields

context

4 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

3 inputs to 3 scored outputs

  • pipe_diameter_mm

    float

    Internal pipe diameter D

    100 to 900mm

  • pipe_slope_pct

    float

    Pipe longitudinal slope as a percentage

    0.1 to 10%

  • mannings_n

    floatfrom archetypehidden in hard

    Manning's roughness coefficient n

    0.009 to 0.025
full_pipe_velocity_m_stol 0.03

Full-pipe flow velocity V (m/s)

full_pipe_capacity_l_stol 0.03

Full-pipe flow capacity Q (L/s)

compliancetol 0.01

Self-cleansing compliance (1.0 = adequate, 0.0 = non-compliant)

visibility contract

Difficulty Ladder

all_giveneasy

Small residential pipe, all parameters given, gentle slope

all fields visible
all_givenmedium

Any pipe size and archetype, all parameters given

all fields visible
partialhard

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

mannings_n

scenario bands

Archetype Atlas

residential_reticulation

2 contexts

PVC residential sewer reticulation main

pipe_diameter_mm150 to 225
pipe_slope_pct0.5 to 3
mannings_n0.011 to 0.013

brisbane-suburban-subdivision / perth-residential-infill

trunk_sewer

2 contexts

Reinforced concrete or vitrified clay trunk sewer

pipe_diameter_mm300 to 600
pipe_slope_pct0.2 to 1.5
mannings_n0.011 to 0.015

melbourne-trunk-sewer / sydney-catchment-sewer

rising_main_connection

2 contexts

Gravity sewer downstream of a rising main discharge point

pipe_diameter_mm150 to 300
pipe_slope_pct1 to 5
mannings_n0.011 to 0.013

adelaide-pump-station-outlet / gold-coast-rising-main-junction

industrial_sewer

2 contexts

Industrial gravity sewer on steep grade with heavy solids

pipe_diameter_mm225 to 450
pipe_slope_pct2 to 10
mannings_n0.013 to 0.025

darwin-industrial-estate / cairns-food-processing-plant

rendered task

Generation Preview

brisbane-suburban-subdivision-residential-reticulation-preview

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

visible fields

  • pipe_diameter_mm150 to 225 mm
  • pipe_slope_pct0.5 to 3 %

withheld schema

mannings_nfull_pipe_velocity_m_sfull_pipe_capacity_l_scompliance
PVC residential sewer reticulation main. brisbane-suburban-subdivision. Required outputs: full_pipe_velocity_m_s, full_pipe_capacity_l_s, compliance