02780    a2200349   4500001001100000005001700011008003900028020001800067037003600085040000700121041000800128072001500136072001500151072001500166072001400181072001400195072001300209072001300222072001200235072002100247072002100268072002100289072002100310072002100331100002300352245016400375250000600539260002400545300001000569520183600579999001502415113802767720250317100403.0250312042015xx                   eng    a9781138027671  bTaylor & FranciscGBP 54.99fBB  a01  aeng7 aKNB2thema7 aRBK2thema7 aTVB2thema7 aTN2thema7 aKNBW2bic7 aRBK2bic7 aTVB2bic7 aTN2bic7 aSCI0110002bisac7 aSCI0260002bisac7 aTEC0030002bisac7 aTEC0090202bisac7 aTEC0100302bisac1 aZeleke Agide Dejen10aHydraulic and Operational Performance of Irrigation Schemes in View of Water Saving and SustainabilitybSugar Estates and Community Managed Schemes in Ethiopia  a1  bCRC Pressc20150409  a180 p  bThe rate of global increase in water abstraction for irrigation has been declining since the 1970’s due to declining potentials for large and medium-scale irrigation developments, and is expected to further decline in the next decades. As such the significant proportion of the expected increase in production would have to be supplied from existing irrigated and /or cultivated lands. This in turn could be achieved by enhancing land and water productivity through improved performance and optimal operation and maintenance. With less than 15% of over 5 million ha irrigation potential harnessed, irrigation devolvement in Ethiopia remained low. Over 70% of the developed irrigation in the country belongs to small-scale irrigation serving smallholder farmers. While accelerated development of new irrigation, particularly of large and medium-scale schemes is relevant in Ethiopia, ensuring the performance and sustainability of existing schemes is also equally important. The existing irrigation schemes in Ethiopia are generally characterized by an overall performance and technical sustainability levels of below expectation. This thesis evaluates the performance of two large-scale (Wonji-Shoa and Metahara) and two community-managed (Golgota and Wedecha) irrigation schemes located in the Awash River Basin of Ethiopia. The study focussed on hydraulic/water delivery performance in the large-scale schemes, and on comparative and internal irrigation service (utility) evaluation in the community-managed schemes. Water delivery performance was evaluated using routine data and hydrodynamic modelling. Farmers’ utility was evaluated using qualitative responses of water users. Major performance challenges in each category of schemes were addressed and operational/water management options for improvement were identified.  c1444d1444