structure built to store water, usually a reservoir or pond. Manmade lake or reservoir usually characterized by stream inflow and always by a stream outlet. Because of nutrient and soil loss from upstream land use practices, impoundments ordinarily have higher nutrient concentrations and faster sedimentation rates than natural lakes. Their retention times are relatively short.
An executive branch action or inaction that delays or withholds the expenditure or obligation of budget authority provided by law. The president must inform Congress of all such actions. In turn, Congress may approve or reject impoundments.
Impoundment is the refusal of Presidents to spend money that has been appropriated by Congress. All of the Presidents of the United States up to Richard Nixon have used this power, which is regarded as inherent to the office. President Thomas Jefferson first used the power of impoundment in 1801.