To bob forward and under in shallow water so as to feed off the bottom.

The maximum mean daily discharge occurring in a stream during a given flood event.

A summary of streamflow - sediment - or water-quality values computed from data collected with sufficient frequency to obtain reliable estimates of daily mean values.

A site for which daily records of streamflow - sediment - or water-quality values are computed.

The difference between the highest and lowest temperatures recorded on a particular day.

A unit of molecular weight; a unit of mass convenient for the expression of the mass of atoms - being one

A structure of earth - rock - or concrete designed to form a basin and hold water back to make a pond - lake - or reservoir. A barrier built - usually across a watercourse - for impounding or diverting the flow of water. General types of dams include: [1] Arch Dam

A graph showing the flood damages and their probabilities of occurrence. The total area under the curve represents the annual damage.

The difference between the amount of damages without a particular water project and the damages with the project in place.

Slightly wet; somewhat moist or wet.

(1) To dip lightly or quickly into water - as a bird does. (2) To skip or bounce - especially over the surface of water.

An empirically derived equation for the flow of fluids through porous media. It is based on the assumption that flow is laminar and inertia can be neglected - and states that velocity of flow is directly proportional to Hydraulic Gradient. For groundwater - this is equivalent to the velocity being equal to the product of the hydraulic gradient and the effective subsoil conductivity or permeability. See Specific Discharge (Specific Flux).

In its strictest sense - data may be defined only as the raw numbers (or descriptions - in the case of qualitative data) - either in Time-Series format (data covering observations over specific periods of time) - Cross-Sectional format (data consisting of a number of observations taken at a specific point in time or about a specific event or phenomenon) - or a combination of these two. Also see Information.

Typically - data acquired by direct interaction - such as direct observation through measurements - tabulation - or surveys. Contrast with Secondary Data.

Typically - data acquired from published sources as opposed to data acquired from direct observation or measurement such as a survey. Contrast with Primary Data.