Calibration of Channel Roughness Coefficient for Thiba Main Canal Reach in Mwea Irrigation Scheme, Kenya
Imbenzi J. Serede,
Benedict M. Mutua,
James M. Raude
Issue:
Volume 3, Issue 6, November 2015
Pages:
55-65
Received:
15 August 2015
Accepted:
11 September 2015
Published:
15 October 2015
Abstract: Canal roughness is one of the most sensitive parameter in simulation of irrigation canals. The present study attempted to calibrate the channel roughness coefficient (Manning’s “n” value) along the Thiba main canal reach, through simulation of canal discharges and water depths using HEC-RAS Model. After HEC-RAS model was calibrated and validated using two sets of observed discharges and water levels, it was used to simulate the hydraulic behaviour of Thiba main canal reach in Mwea Irrigation Scheme (MIS). The model was used to simulate different flows in the main canal as a result of varying the design discharges through the sluice gates and drop structures. Statistical and graphical techniques were used for model assessment to establish its performance. The results of the study showed that an increase in roughness coefficients caused a corresponding increase in the water levels for both Link Canal II (LCII) and Thiba Main Canal (TMC), while a decrease in roughness coefficients led to a decrease in water levels for both canals. The largest change in simulated water levels was 0.45 and 0.12 m in TMC and LCII respectively. It was concluded from the simulation study that Manning’s “n” value of 0.023 and 0.016 gave best result for LCII and TMC reaches respectively.
Abstract: Canal roughness is one of the most sensitive parameter in simulation of irrigation canals. The present study attempted to calibrate the channel roughness coefficient (Manning’s “n” value) along the Thiba main canal reach, through simulation of canal discharges and water depths using HEC-RAS Model. After HEC-RAS model was calibrated and validated us...
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A Study on Water Quality Parameters of Water Supply in Sylhet City Corporation Area
Gulam Md. Munna,
Shriful Islam,
N. M. R. Hoque,
K. Bhattacharya,
S. D. Nath
Issue:
Volume 3, Issue 6, November 2015
Pages:
66-71
Received:
5 September 2015
Accepted:
15 October 2015
Published:
3 November 2015
Abstract: An investigation was carried out to assess the water quality parameters of water supplied by Sylhet City Corporation (SCC).The supplied water quality is at risk to deteriorate during its flow through the delivery system and/or due to the possibility of high elemental concentration in ground water. In SCC, there are 23 pumps available that continually supply water for city dwellers. The parameter analyzed are like pH, turbidity, hardness, chloride, TDS (Total dissolved solid), arsenic, iron, FC (Fecal Coliform) and TC (Total Coliform). All results are compared with the World Health Organization (WHO), Bangladesh Standard (BD) and the Indian Standard Institute (ISI).The investigation discovers that the value of turbidity and iron in the location of Christian Mission designated by S-11 crosses the all three standard. The measurement of TDS and chloride shows that the values are within the safe limit. Analysis of arsenic and FC water quality parameter revealed that there are no arsenic and fecal coliform contamination. The water treatment facilities of SCC have to be enhanced; necessary steps should be taken to reduce the contamination and adequate treatment facility should be promoted.
Abstract: An investigation was carried out to assess the water quality parameters of water supplied by Sylhet City Corporation (SCC).The supplied water quality is at risk to deteriorate during its flow through the delivery system and/or due to the possibility of high elemental concentration in ground water. In SCC, there are 23 pumps available that continual...
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