- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 21 Sep 2021
As it relates to water, inflow can be defined as the water that enters another body of water. Inflow can be caused by flooding, surface water inflow and gains from groundwater. The opposite of inflow is outflow.
Inflow is typically associated with rivers which may have multiple inflow sources - typically with a single source acting as the predominant one. Inflow control measures (by way of pumps, valves or other devices) may be adopted to ensure that water levels do not exceed certain levels.
 Calculation method
The term inflow can also be used to describe the average volume of incoming water - based on time elapsed. According to a 1978 Journal of Hydrology article by D. J. Gilbert, ‘Calculating lake inflow (note)’, "For small lakes it is not feasible to measure more than a small fraction of the inflow directly. The inflow, defined as gross inflow less surface evaporation and groundwater losses, can be obtained from the conservation of volume equation"
 Other applications of the term
Other subject areas associated with the term inflow include finance/investment (as in cash flow), fire protection systems (as in airflow), availability of personnel (as in the movement of a large number of people) and dispersal of building materials other than water.
 Related articles
- Groundwater control in urban areas.
- Rain garden.
- River engineering.
Featured articles and news
The contentious nature of claims associated with cladding, fire safety and EWS1 forms.
ECA comments on low-carbon heating systems initiative and Heat and Buildings Strategy.
Cinders and other forms of domestic rubbish created filth but also generated great wealth.
CIC 2050 Group requests input to find out priorities for future industry leaders.
IHBC publishes response to consultation.
Institute applauds funding initiatives but presses for additional retrofit and tax measures.
The switch from analogue to digital has begun.
The fourth industrial revolution is well underway.
Free online resource will offer guidance on conserving places and the planet during COP26.