COMPARATIVE EVALUATION OF LOCAL WATER MANAGEMENT PRACTICES  IN TWO COMMUNITIES MANAGED SMALL-SCALE IRRIGATION SCHEMES: CASE STUDY OF GATTO AND ARGUBA IN DERASHE IN SNNPR, ETHIOPIA
Creators: name: AGEGNEHU KITANBO YOSHE
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2015

description: This  study  analyses  the  comparative  evaluation  of  local  water  management  practices  in  two 
communities  managed  small-scale  irrigation  schemes:  case  study  of  Gatto  and  Arguba  in 
SNNPR.  Primary  and  secondary  data  were  collected  from  farmers‟  field  and  from  Derashe 
Woreda  irrigation  district.  All  the  data  for  the  community  managed  small  scale  irrigation 
schemes  includes  area  for  both  irrigation  schemes,  agricultural  production  for  both  schemes, 
irrigation water related data and others.  Community-managed irrigation schemes are managed, 
maintained  and  operated  by  farmers  themselves.  This  activity  includes  water  diversion, 
conveyance,  and  maintenance  of  infrastructure,  sanctions  for  misbehaving  and  others.  Gatto 
irrigation  Scheme designed to irrigate  the command area of 200ha and Arguba  irrigation scheme 
was also designed to irrigate the command area of 150ha.
Three groups of comparative performance indicators were used to asses both irrigation schemes. 
This includes  three water supply indicators such as  (Annual irrigation water delivery per unit 
irrigated cropped area, Annual relative water supply and Annual relative irrigation supplies), four 
agricultural output indicators such as  (Output per unit irrigated cropped (harvested) area,  Output 
per  unit  command  area,  Output  per  unit  irrigation  water  supply  and  Output  per  unit  water 
consumed)  and  two  physical  indicators  such  as  (Irrigation  ratio  and  Sustainability  of  irrigated 
area  )  were  used  to  evaluate  the  performance  of  the  schemes.  The  results  obtained  show  the 
irrigation sustainability of Gatto was 0.7867 and that of arguba was 0.881. For irrigation ratio the 
result for both schemes was 0.967 and 0.88 for Gatto and Arguba irrigation scheme respectively. 
In this result it shows that the value of indicators  of  Arguba irrigation scheme was Higher than 
that of Gatto irrigation scheme. For water supply indicators the result for  Annual relative water 
supply  was 1.871 and 1.624 for Gatto  and Arguba irrigation scheme respectively.  For  Annual 
relative irrigation  supply  the result was 1.52 and 1.63 for Gatto and Arguba irrigation scheme 
respectively. The values of annual relative irrigation  supply  for both schemes were higher than 
one  this  shows  that  there  were  over  supply  of  water  in  both  irrigation  schemes  and  For 
agricultural indicators the result for output per unit irrigated cropped area was 18633.95 birr/ha 
and  16828.20  birr/ha  respectively  for  Gatto  irrigation  schemes,  output  per  unit  command  area 
was 1639.88 birr/ha and 13238.18 birr/ha respectively for Gatto and Arguba irrigation schemes, 
for output per unit irrigation water supply was 2.3 birr/m3 and 2.32 birr/m3 for Gatto and Arguba 
irrigation  schemes  respectively  and  for  output  per  unit  consumed  was  3.24  birr/m3  and  3.44 birr/m3. For this result the land productivity of Gatto irrigation was higher than Arguba irrigation 
scheme and  the water productivity of Gatto irrigation was lower than that of Arguba irrigation 
scheme.  For irrigation efficiencies the application and storage efficiency for the three fields for 
Arguba irrigation scheme were higher than that of Gatto irrigation scheme but the distribution 
efficiencies  for  field  2  and  3  in  Gatto  irrigation  scheme  were  higher  than  that  of  Arguba 
irrigation scheme but field 1 of Gatto irrigation scheme has distribution efficiency than that of 
Arguba  irrigation  scheme.  In  general  the  variation  in  efficiency  illustrates  the  fact  that 
application efficiency varies with  every irrigation event, depending on how the water is applied 
and the conditions existing at the time of the irrigation event.