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built templateerosion-sedimentwith-tool

Sediment Basin Sizing

Sizes construction-phase sediment basins for erosion and sediment control per the Blue Book (Managing Urban Stormwater: Soils and Construction). Calculates settling zone volume (V_s = Cv*A), sediment storage volume (V_sed = R*A*D), and total basin volume for Type D (dry) or Type F (wet with permanent pool) configurations based on soil loss rates and climate region.

inputs

6 fields

context

5 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

6 inputs to 3 scored outputs

  • catchment_area_ha

    float

    Contributing catchment area A

    0.1 to 50ha

  • volumetric_runoff_coeff_m3_ha

    floatfrom archetypehidden in hard

    Volumetric runoff coefficient Cv (varies by rainfall region)

    150 to 400m³/ha

  • soil_loss_rate_m3_ha_yr

    floatfrom archetypehidden in hard

    Soil loss rate R

    1 to 50m³/ha/yr

  • cleanout_interval_yr

    float

    Sediment clean-out interval D

    0.25 to 2years

  • basin_type

    enum

    Basin type: D (dry) or F (wet with permanent pool)

    DF

  • permanent_pool_volume_m3

    floatoptional

    Permanent pool volume for Type F basins

    0 to 5000m³
settling_volume_m3tol 0.03

Settling zone volume V_s (m³)

sediment_storage_volume_m3tol 0.03

Sediment storage volume V_sed (m³)

total_basin_volume_m3tol 0.03

Total basin volume V_total (m³)

visibility contract

Difficulty Ladder

all_giveneasy

Type D basin with all parameters given — straightforward volume calculation

all fields visible
all_givenmedium

Type F basin with permanent pool — agent must combine three volume components

all fields visible
partialhard

Soil parameters hidden — agent must infer Cv and R from site description and soil type

volumetric_runoff_coeff_m3_hasoil_loss_rate_m3_ha_yr

scenario bands

Archetype Atlas

dispersive_clay

3 contexts

Dispersive clay soil construction site in a high-rainfall coastal region

volumetric_runoff_coeff_m3_ha300 to 400
soil_loss_rate_m3_ha_yr20 to 50

sydney-western-suburbs / wollongong-escarpment / brisbane-southern-suburbs

reactive_clay

3 contexts

Reactive clay soil construction site in a moderate-rainfall inland region

volumetric_runoff_coeff_m3_ha200 to 300
soil_loss_rate_m3_ha_yr10 to 25

melbourne-western-suburbs / geelong-growth-corridor / ballarat-residential

sandy_coastal

3 contexts

Sandy soil construction site in a coastal region with moderate rainfall

volumetric_runoff_coeff_m3_ha150 to 250
soil_loss_rate_m3_ha_yr1 to 8

perth-northern-coastal / gold-coast-hinterland / sunshine-coast-subdivision

rocky_terrain

3 contexts

Rocky terrain construction site with shallow topsoil and steep grades

volumetric_runoff_coeff_m3_ha250 to 350
soil_loss_rate_m3_ha_yr5 to 15

cairns-hillside / townsville-range / hobart-derwent-valley

alluvial_floodplain

3 contexts

Alluvial floodplain construction site with silty soils in a tropical region

volumetric_runoff_coeff_m3_ha300 to 400
soil_loss_rate_m3_ha_yr15 to 40

darwin-palmerston / mackay-river-flats / bundaberg-burnett-river

rendered task

Generation Preview

sydney-western-suburbs-dispersive-clay-preview

difficulty
hard
visibility
partial
archetype
dispersive_clay
site context
sydney-western-suburbs
instruction excerptsediment-basin-sizing_calc.py

visible fields

  • catchment_area_ha0.1 to 50 ha
  • cleanout_interval_yr0.25 to 2 years
  • basin_typeD
  • permanent_pool_volume_m30 m³

withheld schema

soil_loss_rate_m3_ha_yrvolumetric_runoff_coeff_m3_hasettling_volume_m3sediment_storage_volume_m3total_basin_volume_m3
Dispersive clay soil construction site in a high-rainfall coastal region. sydney-western-suburbs. Required outputs: settling_volume_m3, sediment_storage_volume_m3, total_basin_volume_m3