October 1, 2010 Thesis Open Access

ECHAN GELANO DIDA

MARC21 XML Export

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    <subfield code="a">The  purpose  of  this  study  was  to  investigate  subsurface  dam  in  the  alluvial  stream  flow 
areas  of Afar  National  Regional  State,  where  critical  water  shortage  is  the  problem  of the 
dwellers  in  the  area.  Assessment  was  done  on  the  selected  two  (Mille  and  Jara)  rivers  in 
the  Awash  river  basin.  Arc-GIS  and  its  extensions  Arc  Hydro  and  HEC-GeoHMS  were 
used  to  delineate  the  sub  basins  from  Digital  elevation  Model  of Awash  River  basin  and 
analyze the  soil  and  land  use  and  cover. 
In  the  study  HEC-HMS  and  HEC-RAS  modeling  software's  were  used  to  determine  the 
rainfall-runoff  transformations  of  the  basins  from  daily  rainfall  and  analysis  the  flood 
depth  and  bank  stability to  convey the  river flow  respectively. 
Soil  composition  of the  storage  areas  was  analyzed to  estimate  the  storage  capacity  of the 
reservoir  and  its  yield.  Additional  soil  composition  of  the  catchment  was  determined 
through  HEC-GeoHMS  to  forecast the  reason  of river flow depletion  in  the  rivers  valley. 
From  hydrological  analysis  the  peak  discharges  of  the  two  catchments  were  found 
755. lm
3
/ s  and  181 . 4m
3
/s  with  a  volume  of  19388.2x10
6
m
3 
and  2108.6xl0
6
m
3 
for  Mille 
and  Jara using daily rainfall  analysis  of  the  catchments. 
From  discharges  analyzed  in  hydrologic  model  and  the  flow  depth  was  generated  by 
HEC-RAS  for  surveyed  sections  of  the  river;  and  the  capacity  of  the  river  was  rested 
whether  it  safely  convey.  the  discharge  or  overtop  the  banks.  The  rivers  can  convey  the 
peak discharge  in  most of its  way and  overtop  in  one  or  more  sections of the  bank. 
Groyne  type  ofriver training  method was  proposed  for  enhancing  both  river  training and 
recharging  the  subsurface  storage  area.  Additionally  levee  t ype  of  river  training  was 
recommended  to  control  over the  overtopping problem in  some  sections  of the  rivers. 
Water  requirement  analyses  was  made  t o  assure  that  subsurface  dam  can  cover  the 
\ 
demand  of the  area  for  the  critical  conditions.</subfield>
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    <subfield code="a">SUB-SURFACE  DAM  AND  RIVER  TRAINING  PROPOSAL  FOR SUB-SURFACE  FLOW  UTILIZATION  [  Case  study  in  Afar  Region]</subfield>
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    <subfield code="a">10.20372/nadre:1554185248.71</subfield>
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    <subfield code="a">ECHAN GELANO DIDA</subfield>
    <subfield code="u">Arbaminch University</subfield>
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