Hrt Calculation

Calculates hydraulic retention time from treatment volume and flow rate using HRT = V/Q. The template reports retention time in days and hours plus the hourly flow rate, providing a deterministic first-pass wastewater and water treatment sizing calculation.

inputs

2 fields

context

2 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

2 inputs to 3 scored outputs

reactor_volume_m3
float
Treatment reactor or tank volume
1 to 200000m3
flow_rate_m3_d
float
Average flow rate through the treatment unit
1 to 1000000m3/d

hrt_daystol 0.03

Hydraulic retention time in days

hrt_hourstol 0.03

Hydraulic retention time in hours

flow_rate_m3_htol 0.03

Flow rate in cubic metres per hour

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for a small treatment unit

all fields visible

all_givenmedium

All parameters given across package and municipal units

all fields visible

all_givenhard

All parameters given for larger treatment basins

all fields visible

scenario bands

Archetype Atlas

package_treatment_unit

2 contexts

Small package treatment unit

reactor_volume_m310 to 500

flow_rate_m3_d20 to 1500

remote-community-wwtp / industrial-package-plant

municipal_basin

2 contexts

Municipal treatment basin

reactor_volume_m31000 to 80000

flow_rate_m3_d2000 to 250000

regional-wwtp / water-treatment-clarifier

rendered task

Generation Preview

regional-wwtp-municipal-basin-preview

difficulty: hard
visibility: all_given
archetype: municipal_basin
site context: regional-wwtp

instruction excerpthrt-calculation_calc.py

visible fields

reactor_volume_m31000 to 80000 m3
flow_rate_m3_d2000 to 250000 m3/d

withheld schema

hrt_dayshrt_hoursflow_rate_m3_h

Municipal treatment basin. regional-wwtp. Required outputs: hrt_days, hrt_hours, flow_rate_m3_h