As president, Nixon cut Congressional spending by "impounding" appropriations; in 1974, Congress reclaimed its budgetary power from a weakened presidency with the "Impoundment Control Act," which introduced the reconciliation device.
Predictions of tailings height for both assessments also agreed well with actual impoundment heights for the first 6 yr of operation.
But this fairy tale collapsed on Dec. 22 along with the impoundment that contained one billion gallons of wet coal sludge, which -- like a tsunami of toxic waste -- buried thousands of acres, many of then inhabited, in Roane County, Tennessee.
The formation of acid mine drainage (AMD) from mine tailings is a severe environmental problem associated with tailings impoundments.
Mill tailings are thickened and deposited as a slurry in a circular impoundment with an area of approximately 1200 ha.
Leakage quantities are calculated for three different conditions: natural state, regular dam impoundment with an impervious curtain, and regular dam impoundment without an impervious curtain.
In contrast, the elevated nature of many conventional, unthickened tailings impoundments results in recharge over most of the surface of the impoundment, with discharge occurring outside the impoundment through large containment dykes.
Sediment redistribution within this artificial landscape differs substantially from that in natural fluvial riparian zones, due to a specific hydrological regime comprising steps of water impoundment with increasing magnitudes and seasonal water level fluctuation holding a range of sediment fluxes.
In addition to turning up the heat in its longstanding dispute with Britain over control of the Falkland Islands, the government of Cristina Fernández de Kirchner also nationalised a Spanish-controlled oil company without providing a penny of compensation and sparred with Ghana over the impoundment of a naval frigate.This week Argentina added Israel to its list of burnt bridges.
We mapped impoundments associated with roads or agricultural land use across the Amazon's Curuá-Una Curuá-Una identified landscape factors correlated with each type of impoundment.
