Editing Hydrogeology of Somalia

Jump to navigation Jump to search

Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.

This page supports semantic in-text annotations (e.g. "[[Is specified as::World Heritage Site]]") to build structured and queryable content provided by Semantic MediaWiki. For a comprehensive description on how to use annotations or the #ask parser function, please have a look at the getting started, in-text annotation, or inline queries help pages.

Latest revision Your text
Line 312: Line 312:
 
||Terrace deposits in major wadis (ephemeral river beds - called ''toggas''). Younger Holocene/Recent deposits often overlie and are in hydraulic continuity with older Pleistocene deposits, which can result in very thick aquifers of over 100 m.  
 
||Terrace deposits in major wadis (ephemeral river beds - called ''toggas''). Younger Holocene/Recent deposits often overlie and are in hydraulic continuity with older Pleistocene deposits, which can result in very thick aquifers of over 100 m.  
  
Typically high productivity aquifers, with medium to high permeability and high infiltration capacity. Estimated transmissivity values are commonly in the range 10<sup>-2</sup> to 10<sup>-3</sup> m²/sec. In the Geed Deeble area (source for the Hargeysa water supply), only one in ten tested boreholes showed a transmissivity of less than 10<sup>-3</sup> m²/sec; the others ranged from 2.86 to 5.18 x 10<sup>-3</sup> m²/sec. Calculated equivalent hydraulic conductivities were in the range 1.4 x 10<sup>-4</sup> m/sec to 7.7 x 10<sup>-5</sup> m/sec. Test yields of the production boreholes ranged from 12 to 20 l/s, with drawdowns typically less than 20 m (data provided by Hargeysa Water Utility).  
+
Typically high productivity aquifers, with medium to high permeability and high infiltration capacity. Estimated transmissivity values are commonly in the range 10<sup>-2</sup> to 10<sup>-3(/sup> m²/sec. In the Geed Deeble area (source for the Hargeysa water supply), only one in ten tested boreholes showed a transmissivity of less than 10<sup>-3(/sup> m²/sec; the others ranged from 2.86 to 5.18 x 10<sup>-3(/sup> m²/sec. Calculated equivalent hydraulic conductivities were in the range 1.4 x 10<sup>-4(/sup> m/sec to 7.7 x 10<sup>-5</sup> m/sec. Test yields of the production boreholes ranged from 12 to 20 l/s, with drawdowns typically less than 20 m (data provided by Hargeysa Water Utility).  
  
 
Generally unconfined, but where covered or associated with Quaternary volcanic basalts, they can be confined, sometimes with considerable artesian pressure (e.g. in the Xunboweyle area). In unconfined aquifers the water table is typically 2 to 3 m deep throughout the year, related to seasonal flows along riverbeds. In deeper confined, artesian aquifers in older deposits, the piezometric head does not fluctuate much throughout the year.  
 
Generally unconfined, but where covered or associated with Quaternary volcanic basalts, they can be confined, sometimes with considerable artesian pressure (e.g. in the Xunboweyle area). In unconfined aquifers the water table is typically 2 to 3 m deep throughout the year, related to seasonal flows along riverbeds. In deeper confined, artesian aquifers in older deposits, the piezometric head does not fluctuate much throughout the year.  

Please note that all contributions to Earthwise may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see Earthwise:Copyrights for details). Do not submit copyrighted work without permission!

Cancel Editing help (opens in new window)

  [] · [[]] · [[|]] · {{}} · · “” ‘’ «» ‹› „“ ‚‘ · ~ | ° &nbsp; · ± × ÷ ² ³ ½ · §
[[Category:]] · [[:File:]] · <code></code> · <syntaxhighlight></syntaxhighlight> · <includeonly></includeonly> · <noinclude></noinclude> · #REDIRECT[[]] · <translate></translate> · <languages/> · ==References== · {{reflist}} · ==Footnote== · {{reflist|group=note}} · <ref group=note> · __notoc__ · {{DEFAULTSORT:}} <div class="someclass noprint"></div> {{clear}} <br>