Irrigation System Designing - Practices of Irrigation and On-farm Water Management - page 107

- Irrigation and Drainage System
- ICID Bulletins
- Agricultural Systems
- Journal of Irrigation and Drainage Division, ASCE
- Transactions of the American Society of Agricultural & Bio-system Engineers
(former ASAE)
- Applied Engineering in Agriculture

Relevant FAO Papers/Reports

- FAO Irrigation and Drainage Paper 45 (Guidelines for designing and evaluating
surface irrigation systems, 1989)

Questions

Common in Surface Irrigation

(1) What are the principles of designing a surface irrigation system?
(2) What are the variables in designing a surface irrigation system?
(3) Discuss the hydraulic factors associated with surface irrigation system?

Border Irrigation

(4) Briefly describe the factors affecting border performance and design.
(5) What are the points to be considered in border design?
(6) Define the following terms: cutoff time, advance ratio, return flow, recession
flow, distribution uniformity, and application efficiency.
(7) What are the design parameters in the case of border system? What are the
approaches of the modern border design?
(8) Describe the following empirical model for border design: (a) SCS method
and (b) Alazba's method.
(9) Why is the simulation model useful? Write down the names of some simula-
tion model/software tools for the border irrigation system design and highlight
their principal features/working principles.
(10) Design a border strip with the following characteristics: field length, L

= 120

0.031 m/h a , a

m, field slope, S o = 0.005, infiltration family, IF = 0.5: k = =

0.58; roughness coefficient, n = 0.12, required depth of infiltration, D req =

0.06 m.
(11) In a cotton field, a farmer has made border strip of 200 m long. The roughness
of the field is estimated as n

0.11, and the average field slope along the
border is 0.09%. Determine the required flow rate per unit width of the border.

=