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Home > Glossary
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BasinAn area having a common outlet for its surface runoff. Also called a "Drainage Basin."Basin BoundaryThe topographic dividing line around the perimeter of a basin, beyond which overland flow (i.e.; runoff) drains away into another basin.Basin LagIn hydrologic terms, the time it takes from the centroid of rainfall for the hydrograph to peak.Basin RechargeIn hydrologic terms, rainfall that adds to the residual moisture of the basin in order to help recharge the water deficit. i.e; water absorbed into the soil that does not take the form of direct runoff.Closed BasinA basin draining to some depression or pond within its area, from which water is lost only by evaporation or percolation. A basin without a surface outlet for precipitation falling precipitation.Closed Basin Lake FloodingFlooding that occurs on lakes with either no outlet or a relatively small one. Seasonal increases in rainfall cause the lake level to rise faster than it can drain. The water may stay at flood stage for weeks, months, or years.Detention BasinsStructures built upstream from populated areas to prevent runoff and/or debris flows from causing property damage and loss of life. They are normally dry, but are designed to attenuate storm flows or detain mud/debris during and immediately after a runoff event. They have no spillway gates or valves and do not store water on a long-term basis. Typical detention times for storm flows are on the order of 24 to 72 hours, but may be as long as 5 to 10 days. Basins designed for detention of mud and rock debris are periodically excavated to maintain their storage capacity.Drainage BasinIn hydrologic terms, a part of the surface of the earth that is occupied by a drainage system, which consists of a surface stream or a body of impounded
surface water together with all tributary surface streams and bodies of impounded surface water.Headwater BasinIn hydrologic terms, a basin at the headwaters of a river. All discharge of the river at this point is developed within the basin.Interbasin TransferIn hydrologic terms, the physical transfer of water from one watershed to another.River BasinIn hydrologic terms, drainage area of a river and its tributaries.Stilling basinIn hydrologic terms, a basin constructed to dissipate the energy of fast-flowing water (e.g., from a spillway or bottom outlet), and to protect the
streambed from erosion.
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