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built templatestormwater-roofwith-tool

Gutter Sizing

Sizes eaves gutters by computing the design stormwater flow from the roof catchment area and rainfall intensity, then selecting the smallest standard gutter profile whose capacity (scaled from the AS/NZS 3500.3 Table 4.2 reference grade by the square root of the installed grade ratio) meets or exceeds the demand. Used in building roof drainage design to prevent overflow and water damage.

inputs

4 fields

context

4 archetypes

engine

with-tool

outputs

4 scored fields

contract fields

Parameter Map

4 inputs to 4 scored outputs

  • roof_catchment_area_m2

    float

    Effective roof catchment area draining to the gutter run

    10 to 5000m²

  • rainfall_intensity_mm_hr

    floatfrom archetypehidden in hard

    Design rainfall intensity for the ARI and duration

    50 to 300mm/hr

  • gutter_profile

    enum

    Nominated eaves gutter profile

    100mm_quad115mm_quad125mm_half_round150mm_quad150mm_half_round175mm_OG

  • gutter_grade_pct

    float

    Longitudinal grade of the gutter (percentage)

    0.1 to 2%
design_flow_l_stol 0.03

Design stormwater flow from the catchment (L/s)

gutter_capacity_l_stol 0.05

Capacity of the selected gutter at the installed grade (L/s)

required_gutter_size_mmtol 0.01

Nominal size of the smallest adequate standard gutter (mm)

compliancetol 0.01

Compliance flag: 1.0 if capacity >= design flow, else 0.0

visibility contract

Difficulty Ladder

all_giveneasy

Small residential roof, all parameters given — straightforward capacity check

all fields visible
all_givenmedium

Larger commercial or industrial roof, all parameters given, higher flows may require upsizing

all fields visible
partialhard

Rainfall intensity hidden — agent must infer I from site context and ARI

rainfall_intensity_mm_hr

scenario bands

Archetype Atlas

residential_house

3 contexts

Single or two-storey residential dwelling with pitched roof and standard eaves gutters

roof_catchment_area_m230 to 200
gutter_grade_pct0.15 to 0.5

sydney-inner-west-house / melbourne-bayside-cottage / brisbane-queenslander

terrace_row

3 contexts

Terrace or row-house with narrow roof draining to a single gutter run

roof_catchment_area_m220 to 80
gutter_grade_pct0.1 to 0.3

sydney-paddington-terrace / melbourne-fitzroy-row-house / adelaide-north-terrace

commercial_awning

3 contexts

Street-front commercial awning or verandah with a short gutter span

roof_catchment_area_m215 to 120
gutter_grade_pct0.2 to 0.5

brisbane-fortitude-valley-awning / perth-cbd-shopfront / hobart-waterfront-verandah

industrial_shed

3 contexts

Large industrial or warehouse building with long-span metal roof gutters

roof_catchment_area_m2300 to 5000
gutter_grade_pct0.2 to 1

darwin-industrial-estate / townsville-port-shed / cairns-processing-facility

rendered task

Generation Preview

sydney-inner-west-house-residential-house-preview

difficulty
hard
visibility
partial
archetype
residential_house
site context
sydney-inner-west-house
instruction excerptgutter-sizing_calc.py

visible fields

  • roof_catchment_area_m230 to 200 m²
  • gutter_profile100mm_quad
  • gutter_grade_pct0.15 to 0.5 %

withheld schema

rainfall_intensity_mm_hrdesign_flow_l_sgutter_capacity_l_srequired_gutter_size_mmcompliance
Single or two-storey residential dwelling with pitched roof and standard eaves gutters. sydney-inner-west-house. Required outputs: design_flow_l_s, gutter_capacity_l_s, required_gutter_size_mm, compliance