Podrobnosti záznamu

Název
    Adequate depth of boreholes in hard rocks: a case study in Ghana
Údaj o odpovědnosti
    P.K. Darko, Jiří Krásný
Další názvy
    Proceedings of the XXX IAH Congress on Groundwater: Past Achievements and Future Challenges, Cape Town/South Africa/26 November-1 December 2000 (Variant.)
Autor
    Darko, P. K.
    Krásný, Jiří
Jazyk
    anglicky
Zdrojový dokument - monografie
    Groundwater: Past Achievements and Future Challenges
Strany
    s. 121-125
Poznámky
    1 obr., 4 tab., 14 bibl.
Předmětová skupina
    granit
    horniny sedimentární
    hydrogeologie regionální
    metasedimenty
    propustnost
    průzkum hydrogeologický
    vrt
Geografické jméno
    Ghana
Klíčové slovo
    Adequate
    Boreholes
    Case
    Depth
    Ghana
    Hard
    Rocks
    Study
Abstrakt (anglicky)
   In Ghana, groundwater supply from boreholes remains the only viable for the numerous scattered rural communities. However, the bedrock consists mainly of hard-consolidated rocks. Boreholes are drilled to varying depths to tap the limited groundwater that occurs in the regolith and wet fractures within the bedrock. Since drilling cost is directly related to depth, quatitative appraisal of the relationship of potential yield to depth has been carried out to estimate adequate depth to which boreholes could be drilled for sustainable yield at minimum cost. For available drawdown of between 3 to 5 m, adequate depths range from 34 to 50m for the Dahomeyan gneiss, 42 to 50 m for the quartzite and sandstone of the Togo and Buem series, 50 to 59 in the Voltaian shale and sandstone, and 39-52 m for granites. These depths are general quides for drilling in hard rocks hand-pump rural water supplyIn Ghana, groundwater supply from boreholes remains the only viable for the numerous
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    31. 8. 2007
Datum importu
    8. 8. 2012