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Flood Control Tasks

2015. február 20., péntek 11:19

Flood Control Tasks

Organized flood control has two separate fields of tasks.

One field is of organizing, managing and supplying technical objectives of flood control, that is, all tasks in the flood control facilities including check-up of protection works, preservation of their protective capacity, replacement for deficiencies in the protective capacity against local overload, heightening temporary flood control constructions for preventing leakage in the dykes, such as emergency dams or cofferdams, and building bracings against breakage in the subsoil, counter reservoirs etc.

The other field is of organising, managing and supplying the public administration tasks. It includes two further subfields. On one hand, there are the tasks needed for the technical work of flood control, such as supplying for the demands for labour force, materials, tools and machinery exceeding the human resources and technical equipment of the organisations established for such tasks. On the other hand, the technical tasks for evacuating the population and its movables in danger in case of emergency, and also tasks for health care of the flood control forces and the population, social care of those evacuated, prevention and repelling of epidemic diseases, measuring and restoring damages.

The concept of flood protection is different in time and space, but also it depends on the development and tolerance of the individual or community. For flood protection to be processed, controlled and measured in figures, the first and most important point is to formulate the flood control policy on adequate level. Political declaration of flood protection is a task of the government and the policy is realised by institutional, regulation and budgetary potentials. The technical part of flood protection is realized in several standards, technical guidelines, and also through regulations that record methodological and procedural rules.



Flood Prevention

Methods of Flood Prevention

  1. Displacement of flood protection dams, increasing of the foreshore
  2. Heightening of flood protection dams
  3. Lowering the flood area by dredging
  4. Reconstructing the water regulation facilities as possible
  5. Lowering, dredging the main river bed
  6. Dredging and restoration of side branches
  7. Removal of buildings and other constructions from the flood area.
  8. Changing, optimization of plant cultivation
  9. Removal of summer dams from the flood area.
  10.  Forming emergency reservoirs


Emergency Storing of Floods

Flood control experiences of the last 30 years in Hungary have proven that, besides developing dyke systems along the rivers and building them to the specified size, applying new methods and solutions is also needed, therefore, besides others, regional flood control systems have to be deployed.  By means of that, development of emergency flood control methods, and constructing emergency flood reservoirs on plain lands, with circular dykes, and tapping ditches took place along several rivers.

The Concept of Emergency Storing, Emergency Flood Reservoirs, and its Place in Flood Control

The term of emergency flood storing is used both in professional terminology and in practice for two different concepts, which are storing in a reservoir or basin and storing on a temporary flood zone. Both of them include redirecting the water to a part of the clear (non-inundated) area chosen beforehand, as a supplementary solution of the flood control system, as to fend off greater damage and disaster. The designated area is used for agriculture or forestry otherwise. The aim of storing is temporary retention of a part of the water carried by the flood wave, and so, decreasing the peak.

The process of the emergency storing and the calculations of the mechanisms of action are identical in both cases. The difference is that storing in a reservoir is an efficient legal category. The reservoir is a storage basin area, built or designated, made suitable for seasonal storing with technical facilities, which is not claimed for other uses but legally chosen for inundation in case of emergency. As a consequence of that, certain limitations of usage are in effect in the area. Requisitioning of the reservoirs takes place according to an operating system prepared and approved beforehand. At the moment, 13 flood reservoirs have been built or designated.
In contrast to that, the areas possible for temporary flood zones are explored but not legally designated for flood storing. A decision to inundate them is always due to consideration individually. Localizing is an active and effective run-off control task along with emergency storing. If extreme danger of extraordinary flood load needs to be fenced off, then an outlet can be directed meanwhile the local protection of goods on the area by opening the area for emergency storing. Such local protection can be assured by constructions, e.g. circular dams, built during flood control works. Deploying the needed terrain features beforehand makes active localization possible.

Last modifying: 2016. augusztus 15., hétfő 13:01