Furthermore, in so far as the methods used are a form of hydraulic engineering, it may be useful to differentiate between controlled inundations (as in most historic inundations in the Netherlands under the Dutch Republic and its successor states in that area and exemplified in the two Hollandic Water Lines, the Stelling van Amsterdam, the Frisian Water Line, the IJssel Line, the Peel-Raam Line, and the Grebbe line in that country) and uncontrolled ones (as in the second Siege of Leiden during the first part of the Eighty Years' War, and the Inundation of Walcheren, and the Inundation of the Wieringermeer during the Second World War).To count as controlled a military inundation has to take the interests of the civilian population into account, by allowing them a timely evacuation, by making the inundation reversible, and by making an attempt to minimize the adverse ecological impact of the inundation. It should also be recognised that this type of flooding would not take place without the intentional human act. tidal flooding of areas that fall dry at ebb tide, and periodical river floods are not inundations in the sense intended here.The latter condition implies that in most topographies the act usually applies to causing an overflow of a river or stream by damming it.Before we limit the concept to military uses, it should be recognised that there are at least two other possible uses of inundation as a human act: Military inundation creates an obstacle in the field that is intended to impede the movement of the enemy.This may be done both for offensive and defensive purposes.Inundating children with hours of homework each night is detrimental, the research suggests, while an hour or two per week usually doesn't impact test scores one way or the other.However, homework only bolsters students' academic performance during their last three years of grade school.
It should therefore be distinguished from other types of flooding, not caused by man.
The same basic finding holds true across the globe, including in the U.
S., according to Gerald Le Tendre of Pennsylvania State University.
Piling on the homework doesn't help kids do better in school. That's the conclusion of a group of Australian researchers, who have taken the aggregate results of several recent studies investigating the relationship between time spent on homework and students' academic performance.
According to Richard Walker, an educational psychologist at Sydney University, data shows that in countries where more time is spent on homework, students score lower on a standardized test called the Program for International Student Assessment, or PISA.
(The inundations ceased with the completion of the Aswan High Dam in 1970.) Whenever a critical issue is being debated, the White House and Congressional offices are inundated with phone calls and e-mails, just as a town may be inundated with complaints when it starts charging a fee for garbage pickup.