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built templatedetention-designwith-tool

Detention Volume Preliminary

Estimates the required stormwater detention storage volume using a simplified triangular inflow hydrograph with constant outflow, as commonly applied in preliminary site drainage design per TR-55 and local council requirements. Computes the volume difference between post-development peak inflow and the allowable release rate over the storm duration, and derives an approximate basin surface area from a nominated design depth.

inputs

4 fields

context

4 archetypes

engine

with-tool

outputs

2 scored fields

contract fields

Parameter Map

4 inputs to 2 scored outputs

  • post_dev_peak_flow_m3_s

    float

    Post-development peak flow rate Q_post

    0.05 to 15m³/s

  • allowable_release_rate_m3_s

    floatfrom archetypehidden in hard

    Allowable (pre-development or regulated) release rate Q_allow

    0.01 to 10m³/s

  • storm_duration_hr

    float

    Design storm duration t_storm

    0.5 to 24hr

  • design_depth_m

    float

    Design water depth of the detention basin

    0.5 to 2m
required_storage_volume_m3tol 0.03

Required detention storage volume (m³)

approximate_surface_area_m2tol 0.03

Approximate basin surface area at design depth (m²)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given — straightforward volume calculation with clear Q_post > Q_allow

all fields visible
all_givenmedium

All parameters given but larger flows and longer storms — agent must apply correct case logic

all fields visible
partialhard

Allowable release rate hidden — agent must infer from site description and local requirements

allowable_release_rate_m3_s

scenario bands

Archetype Atlas

small_residential_subdivision

3 contexts

Small residential subdivision on gentle terrain with local council detention requirements

post_dev_peak_flow_m3_s0.1 to 1
allowable_release_rate_m3_s0.05 to 0.5
storm_duration_hr1 to 6
design_depth_m0.5 to 1.2

sydney-northwest-growth-area / melbourne-casey-corridor / brisbane-north-lakes

commercial_development

3 contexts

Commercial or mixed-use development with high impervious coverage and moderate catchment

post_dev_peak_flow_m3_s0.5 to 5
allowable_release_rate_m3_s0.2 to 2
storm_duration_hr1 to 6
design_depth_m0.8 to 1.5

parramatta-cbd-redevelopment / gold-coast-robina-town-centre / adelaide-tonsley-innovation

industrial_estate

3 contexts

Industrial estate with large hardstand areas and concentrated runoff

post_dev_peak_flow_m3_s1 to 8
allowable_release_rate_m3_s0.3 to 3
storm_duration_hr1 to 12
design_depth_m1 to 2

western-sydney-aerotropolis / geelong-northern-industrial / townsville-port-expansion

large_greenfield

3 contexts

Large greenfield development converting rural land to mixed residential with significant flow increase

post_dev_peak_flow_m3_s3 to 15
allowable_release_rate_m3_s1 to 6
storm_duration_hr2 to 24
design_depth_m1 to 2

wollondilly-growth-area / greater-springfield-qld / armstrong-creek-vic

rendered task

Generation Preview

sydney-northwest-growth-area-small-residential-subdivision-preview

difficulty
hard
visibility
partial
archetype
small_residential_subdivision
site context
sydney-northwest-growth-area
instruction excerptdetention-volume-preliminary_calc.py

visible fields

  • post_dev_peak_flow_m3_s0.1 to 1 m³/s
  • storm_duration_hr1 to 6 hr
  • design_depth_m0.5 to 1.2 m

withheld schema

allowable_release_rate_m3_srequired_storage_volume_m3approximate_surface_area_m2
Small residential subdivision on gentle terrain with local council detention requirements. sydney-northwest-growth-area. Required outputs: required_storage_volume_m3, approximate_surface_area_m2