Rainwater harvesting is the accumulating and storing of rainwater for reuse before it reaches the aquifer. It has been used to provide drinking water, water for livestock, water for irrigation,
as well as other typical uses. Rainwater collected from the roofs of
houses and local institutions can make an important contribution to the
availability of drinking water. It can supplement the subsoil water
level and increase urban greenery. Water collected from the ground,
sometimes from areas that are especially prepared for this purpose, is
called Stormwater harvesting.
In some cases, rainwater may be the only available, or economical,
water source. Rainwater harvesting systems can be simple to construct
from inexpensive local materials, and are potentially successful in most
habitable locations. Roof rainwater may not be potable and may require
treatment before consumption. As rainwater rushes from your roof it may
carry pollutants, such as mercury from coal burning buildings, or bird
faeces. Although some rooftop materials may produce rainwater that would
be harmful to human health as drinking water, it can be useful in
flushing toilets, washing clothes, watering the garden, and washing
cars; these uses alone halve the amount of water used by a typical home.
Household rainfall catchment systems are appropriate in areas with an
average rainfall greater than 200 mm (7.9 in) per year, and no other
accessible water sources (Skinner and Cotton, 1992). Overflow from
rainwater harvesting tank systems can be used to refill aquifers in a process called groundwater recharge; though this is a related process, it must not be confused with rainwater harvesting.
There are several types of systems to harvest rainwater, ranging from very simple home systems to complex industrial systems. The rate at which water can be collected from either system is dependent on the plan area of the system, its efficiency, and the intensity of rainfall (i.e., annual precipitation (mm per annum) x square meter of catchment area = litres per annum yield) ... a 200 square meter roof catchment catching 1,000mm PA yields 200 kLPA.
ld be large enough to carry peak flows. Storage tanks should be covered to prevent mosquito breeding and to reduce evaporation losses, contamination and algal growth.
There are several types of systems to harvest rainwater, ranging from very simple home systems to complex industrial systems. The rate at which water can be collected from either system is dependent on the plan area of the system, its efficiency, and the intensity of rainfall (i.e., annual precipitation (mm per annum) x square meter of catchment area = litres per annum yield) ... a 200 square meter roof catchment catching 1,000mm PA yields 200 kLPA.
ld be large enough to carry peak flows. Storage tanks should be covered to prevent mosquito breeding and to reduce evaporation losses, contamination and algal growth.
No comments:
Post a Comment