Concrete dams, which do not have any steel reinforcement, have a much longer service life than reinforced concrete struc-tures exposed to weather. The oldest concrete dams are about 120 years old. masonry dams can be much older and still be in service.ut at the same time, it can also be very short if some of the safety-relevant elements are no longer functioning properly.an example for uncontrolled safety decrease is the 272m high Enguri arch dam (the worldâs highest arch dam) in Georgia, which was completed in 1984.
As it turns out, mosquitoes do play an important role in a variety of ecosystems. For example, each year when the snow melts in the Arctic tundra, mosquitoes hatch from their eggs and make up a significant part of the biomass. Some scientists believe these insects serve as an important food source for migratory birds.
The use of insects as food and feed has many environmental, health and social/livelihood benefits. For example: environmenTal benefiTs â¢ Insects have a high feed conversion efficiency because they are cold-blooded.n other cases, insects are seen as a snack.From the creation of new recipes and menus in restaurants to the design of new food products, the food industry has a large role to play in raising the status of insects as food. Food industry professionals, including chefs, are experimenting with the flavours of insects.