Design of Precast Parabolic Channels in Peshawar

Introduction to Project of Precast Parabolic Channels

• Canal irrigation system of Pakistan represents one of the largest system.
• Discrepancy feature is the conveyance losses (35 to 50%)
• Irrigation system of KPK (Province of Pakistan) is facing severe Operational problems including water scarcity, water logging, and salinity.
• Reason was due to the traditional brick lining.

Steps to design Precast Parabolic Channels

The following steps are involved in the design of our selected water channel.

• Collection of field data.
• Using design software
• Obtaining the final design parameters

Site Selection

• Site selected was Syphon (Badabher, Peshawar, Pakistan)
• Selected channel was off taking from Warsak canal at RD 96+000 feet
• Name of channel Badabher Akkundi BalaKhel
• CCA 2000 Gareb (Full channel)
• Selected watercourse was earthen
• Wheat and maize were the prime crops of the area

Collection of field data

Instruments

• Common survey equipments

Methodology

• Measurement of Full supply level of the channel (FSL)
• Measurement of Bed level of channel
• Measurement of Full Supply Level at crest
• Measurement of Crest level of channel
• Measurement of FSL at RD 0+00
• Measurement of Bed level at 0+00

In addition to above following data was collected at each 30 meter interval of channel. FSL of channel

• Bed level of channel
• Left bank (L/B) and Right bank (R/B) of channel
• Highest field elevation
• RD's of Nuccas recorded along the channel.

Using Design Software

• Super Calc 5
• DOS version
• Renowned software for designing channels
• INPUTS
• Bed reduced level
• HFL
• CCA
• Discharge (Q)

Conclusions

• Super Calc provides excellent graphical presentation
• MS Excel spreadsheet used for both Brick lining and PCPS
• PCPL much cheaper than brick lining
• 9 drops provided

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