Abstract:
Abstract
The irrigation project of Al-khalis is one of the most important
projects for the Diyala lower basin, which is one of the most productive
agricultural areas in the Iraq, divided into two geographical areas, the
upper and lower of Al-khalis.
This study conducts on upper part of Al-khalis project, occupied an
area of (72850ha.)which included measure seepage losses for Al-khalis
Main Canal between the kilometer (5.600) and (9.200) and Secondary
Canal (9L), check the water conveyance efficiency, measure and specify
the water quality variables of the project by comparing with their standard
limitations and calculate a Canadian Water Quality Index (CWQI).
Seepage losses for Al-khalis Main Canal and Secondary Canal (9L),
which unlined canal which considered in this study are measured by
inflow-outflow method and the results were compared with the results of
two empirical equations (Moritz and Molesworth-Yennidunia), by using
the reaches on canals. The results of seepage losses in main canal are
variable spatially and temporally in five segments (S1, S2, S3, S4, S5),
Temporally, observed that seepage losses in December less than the rest
II
of the months found to very between (0.055 l/s per m2) to (0.177 l/s per
m2), spatially S1 and S4 recorded the highest seepage losses from the rest
of the sections (0.265 l/s per m2, 0.239 l/s per m2) respectively, for
Secondary Canal (9L)results show that the seepage is varied spatially and
temporally in three reach (R1, R2, R3). Temporally, observed that seepage
losses in December higher than rest of months found to very between
(0.0131 l/s/m2) to (0.059 l/s/m2), spatially R2 was recorded high seepage
losses from other reach it varied between (0.053 l/s/m2 to 0.059 l/s/m2).
The results of water conveyance efficiency for Al-khalis main canal and
secondary canal (9L) were (66%, 66.4%) respectively. When compared
with the design values, were less than them.
For chemical evaluation, eight sites were selected, where all test
results were stratified to the specifications. The results of Canadian water
quality Index for both Al-khalis Main Canal and Secondary Canal (9L)
were (94.75%), to be described as excellent.
