Geological risks - Insufficient seepage conditions

Description

The data show rainwater infiltration depending on the type of rock environment and the degree of suitability of concentrated rainwater infiltration in terms of the permeability of the rock environment. There are 5 categories: - infiltration suitable I A collector made of sand gravel suitable for infiltration of rainwater. The technical solution of the infiltration will depend on the thickness of the flood clay overlapping this collector. With a small thickness of flood clay, the infiltration pit will be terminated directly in the gravel. If the surface of the quaternary permeable collector is more than 3 m deep (due to increased loading forces), it will be necessary to consider connecting the infiltration pit with the collector by means of a hydrogeological object (infiltration digging or drilling well). - infiltration of suitable II Infiltration of rainwater in these areas is possible, while the permeability of the rock environment is generally good, only locally at the sites of clay-loam cover deteriorated. - infiltration into loess sediments is generally difficult, their permeability is low, and when these sediments are aquiferised, the swelling of clay minerals further reduces. Groundwater can be infiltrated into the loess complex only from small paved areas up to about 350 m2 (individual house, small establishments), for larger areas it is necessary to supplement the infiltration system with a hydrogeological object recessed into well-permeable fluvial terrace sandy gravel, into which it would be possible to successfully infiltrate through the infiltration of drilled or excavated rainwater waste well. Gravel terraces are mostly watered only at the base, which is a positive factor in terms of infiltration. In any case, however, it is not permissible to infiltrate water directly under the foundations of buildings built in loess areas due to the existence of a risk of percolation of the foundations. - infiltration unsuitable If it is not possible to connect the infiltration pit built in loess sediments with more permeable clastic positions, the rock environment can hold only a very small amount of infiltrated water. In these areas, it is not possible to infiltrate rainwater in a concentrated way at areas with paved surfaces above about 350 m2, as this would require the construction of large-capacity retention tanks. In buildings with paved areas of up to 350 m2, infiltration of storm water is possible, although due to the need to build retention systems, it is usually also uneconomical. - infiltration impracticable Since non-genic clays represent an insulator from a hydrogeological point of view (practically impermeable environment for water), concentrated infiltration of rainwater waste into these sediments is impracticable. Exceptions may only be possible sandy inserts in clays, which, however, due to spatial limitations, are usually not suitable for infiltration either. The data are part of the passport of geology, hydrogeology and engineering geology (now Georisks) of the city of Brno, which was created in 2004 and is always updated by an external company at the end of the year. General was created for employees of the authorities who professionally comment on investment projects, project documentation or issue decisions according to the relevant laws (Building Act, Water Act). It is now also used by contributory organizations (e.g. KAM) and provided as a basis for the processing of studies commissioned by the Statutory City of Brno (SMB). More detailed information can be found in the documentation. The data is in the GCS WGS84 coordinate system.

Resources

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Tags

  • georizika

Topics

  • ENVI

Categories