| Author | Qani, Nazir Ahmad |
| Call Number | AIT RSPR no.WM-10-02 |
| Subject(s) | Irrigation water--Afghanistan--Kandahar
|
| Note | A research study submitted in partial fulfillment of the requirements for the
degree of Master of Engineering in
Water Engineering and Management, School of Engineering and Technology
|
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. WM-10-02 |
| Abstract | This study evaluates lined and unlined watercourses through various methods such as
inflow - outflow and ponding method. It aims to examine seepage losses rate in both
earthen unlined and concrete lined watercourses. In addition, the study was carried
out to assess the differences in water losses through the lined and unlined
watercourses in the particular area of Dahla Dam irrigation system in Kandahar. The
results indicated that seepage losses rate was 0.0 2526 m3
/m2
/day at 100 m section in
secondary sandy loam canal (KAl) by inflow-outflow method. Likewise, the results
from tertiary canal (KA4), unlined watercourse (KA3) and lined watercourse (KA2)
by ponding method was 0.332 m3
/m2
/day, 0.212 m3
/m2
/day and 0.0478 m3
/m2
/day
respectively. The daily seepage rate was 264.48 m3
/ km and 54.6 m3/ km from
unlined and concrete lined watercourses. The concrete lining saved 77 % of seepage
water losses or daily (209.88 m3
/day/km length of canal).
Economic analysis was used to compare two alternatives concrete lining cost with
water value which was saved by concrete lining. Furthermore, the capital recovery
factor addressed annual cost of concrete lined watercourses USD 2991.97
(134638.91 Afghanis).where the upgrading of the watercourse resulted saving water
of 68,211 m3
/km/year which valued USD 9377.81, 26839.93 and 26427 per year
from wheat, grapes and tomatoes respectively. So, annual net benefit was USD
741.15, 5440.8 and 1106.80 per hectare from wheat, grapes and tomatoes
correspondently and benefit cost ratio (B/C) was of 4.13, 9.97 and 9.83 from wheat,
grapes and tomatoes individually. Moreover, the analysis also assessed increments
in cropping intensity after watercourse improvement by 16.69 %, 7 .83 % and 26.58
% from wheat, grapes and tomatoes respectively. |
| Year | 2011 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. WM-10-02 |
| Type | Research Study Project Report (RSPR) |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Shrestha, Sangam;Clemente, Roberto S.; |
| Examination Committee(s) | Babel, Mukand S. ; |
| Scholarship Donor(s) | Kandahar University, Afghanistan;
AIT Fellowship ; |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 2011 |