which of the following is NOT an input control over cultural eutrophication?
harvesting excess weeds
which of the following is not a way to prevent or slow groundwater depleation
grow more water-intensive crops
economic benefits of building large dams include
production of renewable energy and storage of water for agricultural and domestic use (II and III)
increasing water efficiency can be accomplished in all of the following ways except
increasing government subsidies for farmers to pump water from rivers and aquifers below-market prices
over half of the total mass of pollutants entering streams and lakes comes from
nonpoint pollution from agriculture
the water pollution and control laws enacted in the 1970s have done all but which of the following?
forced municipalities to take their water supply from the downstream side of the river
Humans increase the likelihood of flooding by
all of these- draining wetlands, building on floodplains, removing water-absorbing vegetation, and urbanization
dissolved oxygen in a body of water can be directly and indirectly depleated due to large amounts of
all of these- thermal pollution, organic wastes, sediments and suspended matter, and bacteria
which of the following is not a main factor in water scarcity?
fewer people withdrawing water from reliable runoff
one class of pollutants that can cause a population explosion of aerobic bacteria is
oxygen demanding organic wastes
which of the following types of sewage treatment is properly matched?
advanced- physical and chemical processes
which of the following is not one of the ways that climate change can affect water pollution
it can improve water quality of the oceans for marine life and increase fish populations
FASTE STATEMENT- areas of a steam upriver from a point of discharge experience a septic or dead zone
the presence of fecal coliform bacteria in a sample of river water suggest which of the following?
the water is contaminated with animal waste
potential problems that may arise in a fully privatized water system include all of the following except
all are problems- lack of money and expertise, costly for public, using water as profit instead of conserving it
sources of groundwater contamination include
all of these- abandoned hazardous waste dumps, deep wells, and industrial and livestock waste storage lagoons
which of the following is an effective alternative to chlorine for disinfecting wastewater at a municiple treatment plant
which of the following conditions in the himalayan watershed contributes to the flooding in bangladesh?
rapid population growth
which of the following statements about freshwater in the US is false
global warming will likely decrease water-use conflicts
FALSE STATEMENT- slow-flowing rivers are less susceptible to pollutants than fast-flowing streams
farmers can sharply reduce fertilizer runoff by
all of these- using prescribed amounts of fertilizer, planting nitrogen-fixing plants, planting buffer zones, control runoff
which of the following offers the greatest conservation of water?
micro-irrigation or drip irrigation
sustainable use of water involves
all of these- integrated governance of water pollution, participatory decision making, preservation of ecological integrity of water supply systems, and efficient use of water
what is the most ecologically responsible way to dispose of sewage sludge is
treating it with heat to kill harmful bacteria, removing toxic metals, and using it as fertilizer
for drinking water, the world health organization recommends what level of coliform bacterial colonies per 100 mililiters of water sample?
the most common problem encountered by seabirds coated with oil is
loss of buoyancy and insulation, causing deaths from exposure
which of the following statements about lakes is true?
lakes are more vulnerable than streams to contamination
to be considered safe swimming, what should the number of coliform colonies of bacteria by per 100 ml of water?
FALSE STATEMENT- inorganic nutrients such as fertilizers have no adverse effects of aquatic ecosystems
it is most economically and environmentally sound to focus water resource management on
increasing the efficiency in the way we use water