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AE 626 FARM DRAINAGE SYSTEMS DESIGN                                                                               (3L+IP) II

Objective
To acquaint and equip with the importance and phenomenon of drainage system along with design consideration of surface and sub-surface drainage systems.

Theory

UNIT I
Hydrologic basis for drainage system design; occurrence of floods; analysis of rainfall for drainage system design; analysis of flow into and through soil upto effective root zone depth.

UNIT II
Drainage and crop production; types of drains; surface drainage systems; sub-surface drains in homogenous isotropic soils and anisotropic .heterogeneous soils; drainage for salinity control.

UNIT III
Soil dynamics in a sub-surface drained soil; computational analysis for solution of flow and draw- down problems.

UNIT IV
Basics of drainage coefficients and degree of desirable drainage; drainage structures; design, layout and construction of farm drainage systems considering rainfall, topography, soil and crops; gravity- cum-pump drainage systems.

UNIT V
Drainage using tubewells (vertical drainage); macro-drainage system considerations in design; outlet considerations, drainage modeling; legislation involved.

Practicals
Measurement of in-situ hydraulic conductivity, estimation of drainage coefficient and leaching requirements, delineation of waterlogged areas through isobar, isobath and topographic maps, design of surface and subsurface drainage systems, design of filter and envelop materials.

Suggested Readings