Comparison of irrigation performance based on management and ...

These indicators were measured using the following mathematical descriptions:
E C
Water flowing out <strong>of</strong> the system
=
Water flowing into the system
(1a)
ARWS
Total volume <strong>of</strong> water sup plied
=
Total volume <strong>of</strong> crop water demand
(1b)
Total volume <strong>of</strong> <strong>irrigation</strong> water diverted
ARIS =
Total volume <strong>of</strong> <strong>irrigation</strong> water demanded
(1c)
Volume <strong>of</strong> water actually delivered
WDR =
int ended volume <strong>of</strong> water tobe delivered
(1d)
Outpout per harvested area ( tons / ha)
Pr oduction(
tons)
=
Irrigated cropped area ( ha)
(2a)
Outpout per harvested area ( US$ / ha)
Local value <strong>of</strong> production ( US$)
=
Irrigated cropped area ( ha)
(2b)
Outpout per command area ( US$ / ha)
Local value <strong>of</strong> Pr oduction(
US$)
=
Command area ( ha)
2c)
3 Local value <strong>of</strong> Pr oduction ( US$)
Outpout per water sup plied ( US$ / m ) =
3
Diverted <strong>irrigation</strong> sup ply ( m )
(2d)
Data used in this study are emanating from different sources. Sugar estates have their own records
regarding annual production, water diverted to the schemes and meteorological data.
Table 1: Sources <strong>of</strong> important data
Data
Irrigation schemes
Metahara Wonji Finchaa Hare Sille Bilate
Metro Data Estate Estate Estate NMSA NMSA Tessema,
2006
Production Estate Estate Estate Belete, Aklilu, Tessema
2006 2006
Water supply Estate Estate Estate Belete Aklilu
ARWS calculated calculated calculated Belete Aklilu Tessema
ARIS calculated calculated calculated Belete Aklilu Tessema
Efficiency measured measured Belete Aklilu
17