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built templatedetention-designwith-tool

Weir Outlet Design

Sizes a sharp-crested rectangular weir for detention basin emergency overflow using the Francis formula Q = Cw * (L - 0.1*n*H) * H^1.5, where Cw = Cd * sqrt(2g). Solves for the required crest length given design flow, head, discharge coefficient, and end contractions, supporting stormwater detention and flood control design.

inputs

4 fields

context

4 archetypes

engine

with-tool

outputs

2 scored fields

contract fields

Parameter Map

4 inputs to 2 scored outputs

  • design_flow_m3_s

    float

    Design overflow discharge Q

    0.01 to 10m³/s

  • head_over_weir_m

    floatfrom archetypehidden in hard

    Head of water over the weir crest H

    0.05 to 1.5m

  • discharge_coefficient

    floatoptionalfrom archetypehidden in hard

    Weir discharge coefficient Cd

    0.55 to 0.7

  • number_of_contractions

    intoptionalfrom archetype

    Number of end contractions n (0 = suppressed, 1 or 2 = contracted)

    0 to 2
required_weir_length_mtol 0.03

Required weir crest length L (m)

unit_discharge_m3_s_per_mtol 0.03

Unit discharge per metre of weir crest q (m³/s/m)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, suppressed weir with standard coefficient

all fields visible
all_givenmedium

All parameters given, variable coefficient and end contractions

all fields visible
partialhard

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

discharge_coefficienthead_over_weir_m

scenario bands

Archetype Atlas

small_urban_basin

2 contexts

Small urban detention basin with low-level spillway weir

head_over_weir_m0.05 to 0.3
discharge_coefficient0.6 to 0.64
number_of_contractions0

sydney-infill-residential / melbourne-suburban-subdivision

medium_commercial_basin

2 contexts

Medium commercial development detention basin spillway

head_over_weir_m0.2 to 0.6
discharge_coefficient0.58 to 0.63
number_of_contractions0 to 2

brisbane-commercial-park / adelaide-retail-precinct

large_regional_basin

2 contexts

Large regional stormwater detention facility with emergency spillway

head_over_weir_m0.4 to 1.2
discharge_coefficient0.6 to 0.65
number_of_contractions0

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

channel_diversion_weir

2 contexts

Channel diversion weir with end contractions

head_over_weir_m0.1 to 0.5
discharge_coefficient0.58 to 0.62
number_of_contractions1 to 2

canberra-drainage-diversion / townsville-channel-control

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 excerptweir-outlet-design_calc.py

visible fields

  • design_flow_m3_s0.01 to 10 m³/s
  • number_of_contractions0 to 0

withheld schema

discharge_coefficienthead_over_weir_mrequired_weir_length_munit_discharge_m3_s_per_m
Small urban detention basin with low-level spillway weir. sydney-infill-residential. Required outputs: required_weir_length_m, unit_discharge_m3_s_per_m