Drainage of Agricultural Lands - Practices of Irrigation and On-farm Water Management - page 374

- Agricultural Water Management
- ICID Bulletin
- Egyptian Journal of Irrigation & Drainage
- Soil Science Society of America Journal
- Agronomy Journal
- Journal of Soil Water Conservation
- Journal of Environ. Quality
FAO/World Bank Papers
- FAO Irrigation and Drainage Paper 60 (Materials for Subsurface Land Drainage
Systems, 2000)
- FAO Irrigation and Drainage Paper 61 (Agricultural drainage water management
in arid and semi-arid areas, 2003)
- FAO Irrigation and Drainage Paper 62 (Guidelines and computer programs for the
planning and design of land drainage systems, 2007)
- FAO Training Manual: Drainage of Irrigated Lands (Irri. Water Management
Training Manual No.9, 1996)
- World Bank Technical Paper 195 (Drainage Guidelines, 1992)
Questions
(1) What are the benefits of drainage? Is drainage necessary in arid region?
(2) How you will assess the need of drainage in an agricultural farm?
(3) What factors will you consider during investigation and design for a drainage
problem area?
(4) What suggestions will you made to lessen the drainage outflow from an area?
(5) What is drainable pore volume?
(6) Distinguish among homogeneous, isotropic, and homogeneous and isotropic
media.
(7) Deduce the partial differential equation for flow through the homogeneous,
anisotropic soil media. From this, derive the equation for homogeneous and
isotropic soil.
(8) Derive an equation for calculating resultant/equivalent horizontal hydraulic
conductivity for layered soil.
(9) Briefly describe the design steps and principles of surface drainage system.
(10) Discuss the conditions of resultant vertical conductivity for layer soil.
(11) Define with neat sketch the Hooghoudt's drain spacing equation for layered
soil.
(12) What do you mean by “equivalent depth” in Hooghoudt's drain spacing
equation?
(13) Draw a schematic layout for a surface drain design in a farm.