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built templatedetention-designwith-tool

Orifice Outlet Design

Sizes a circular orifice outlet for a stormwater detention basin by rearranging the orifice equation Q = Cd*A*sqrt(2gH) to solve for the required orifice area and diameter given a target discharge flow rate and available head. Commonly applied in urban stormwater management to control post-development peak flows.

inputs

3 fields

context

4 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

3 inputs to 3 scored outputs

  • design_flow_m3_s

    float

    Target discharge flow rate Q

    0.005 to 2m³/s

  • head_above_centreline_m

    floatfrom archetypehidden in hard

    Head of water above orifice centreline H

    0.1 to 5m

  • discharge_coefficient

    floatoptionalfrom archetypehidden in hard

    Orifice discharge coefficient Cd

    0.4 to 0.8
required_orifice_area_m2tol 0.03

Required orifice area A (m²)

orifice_diameter_mmtol 0.03

Orifice diameter D (mm)

discharge_velocity_m_stol 0.03

Discharge velocity through orifice v (m/s)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, standard discharge coefficient

all fields visible
all_givenmedium

All parameters given, variable discharge coefficient

all fields visible
partialhard

Discharge coefficient and head hidden, agent must infer from site context

discharge_coefficienthead_above_centreline_m

scenario bands

Archetype Atlas

small_urban_basin

2 contexts

Small urban detention basin with low head

head_above_centreline_m0.3 to 1
discharge_coefficient0.59 to 0.63

sydney-infill-residential / melbourne-suburban-subdivision

medium_commercial_basin

2 contexts

Medium commercial development detention basin

head_above_centreline_m0.8 to 2
discharge_coefficient0.58 to 0.62

brisbane-commercial-park / adelaide-retail-precinct

large_regional_basin

2 contexts

Large regional stormwater detention facility

head_above_centreline_m1.5 to 4
discharge_coefficient0.6 to 0.65

perth-regional-wetland / gold-coast-flood-control

shallow_linear_basin

2 contexts

Shallow linear detention basin along road corridor

head_above_centreline_m0.1 to 0.5
discharge_coefficient0.55 to 0.6

canberra-road-corridor / townsville-drainage-channel

rendered task

Generation Preview

sydney-infill-residential-small-urban-basin-preview

difficulty
hard
visibility
partial
archetype
small_urban_basin
site context
sydney-infill-residential
instruction excerptorifice-outlet-design_calc.py

visible fields

  • design_flow_m3_s0.005 to 2 m³/s

withheld schema

discharge_coefficienthead_above_centreline_mrequired_orifice_area_m2orifice_diameter_mmdischarge_velocity_m_s
Small urban detention basin with low head. sydney-infill-residential. Required outputs: required_orifice_area_m2, orifice_diameter_mm, discharge_velocity_m_s