Water balance
Account for precipitation, evapotranspiration, runoff and changes in storage over a defined spatial and temporal boundary.
Side 193Side Studies / Research
Subject
Hydrology
Purpose
Water on and beneath land studied through precipitation, runoff, infiltration, groundwater, storage and watershed transport.
Structure
05 movesMechanism mapV0
Entities → interactions → mechanisms → scales → measurement
Track water as storage and flow through a landscape.
Hydrology connects atmospheric input to surface and subsurface pathways, making scale, heterogeneity and measurement of hidden stores central challenges.
Infiltration & soil water
Study how soil structure and saturation control water entry, retention and movement through the unsaturated zone.
Runoff & rivers
Relate rainfall, terrain and watershed connectivity to streamflow timing and flood response.
Groundwater
Track hydraulic gradients, aquifers, recharge and exchange between subsurface and surface water.
Hydrologic extremes
Examine drought and flood as outcomes of interacting meteorology, storage, land cover and human management.
Keep the boundaries visible.
These separations prevent nearby ideas from collapsing into one another before the subject is understood.
rainfall ≠ runoff
water table ≠ aquifer thickness
return period ≠ fixed recurrence schedule
Questions that organize the Side.
Use these to test whether the model is becoming explanatory rather than merely familiar.
Which hydrologic processes can be measured directly and which must be inferred?
How does spatial heterogeneity alter watershed-scale prediction?
When do human withdrawals and infrastructure dominate natural water balance?
What should carry weight here?
Use gauging, wells, tracers, remote sensing and water-balance closure together; parameter transfer across watersheds requires explicit validation.