Floats, current meters, and acoustic Doppler velocimeters are all commonly used methods for measuring streamflow velocity.

Weirs are used to measure streamflow, control water flow, and create reservoirs.

Grab samples, composite samples, and continuous samples are all common methods for collecting water quality samples.

Groundwater monitoring wells are used to measure groundwater levels, collect groundwater samples, and inject water into the ground.

Piezometers, observation wells, and monitoring wells are all common methods for measuring groundwater levels.

Slug tests are used to measure groundwater permeability.

Pumping tests are a common method for measuring groundwater transmissivity.

Groundwater tracer tests are used to measure groundwater velocity, dispersion, and recharge.

Lysimeters, infiltration tests, and soil moisture monitoring are all common methods for measuring groundwater recharge.

Groundwater models are used to simulate groundwater flow, predict groundwater contamination, and manage groundwater resources.

Numerical models, analytical models, and conceptual models are all common types of groundwater models.

Groundwater management plans are used to protect groundwater resources, prevent groundwater contamination, and allocate groundwater resources.

Groundwater monitoring, groundwater modeling, and groundwater regulations are all common elements of a groundwater management plan.

Groundwater protection zones are used to protect groundwater resources from contamination, limit groundwater development, and promote groundwater recharge.

Wellhead protection zones, aquifer protection zones, and source water protection zones are all common types of groundwater protection zones.