The article contains fundamental notes on the "Water Logging" topic of the "Environmental Engineering" subject.
Leaching Requirement, (L.R)
Where, Dd = Depth of water drained out per unit area
Da = Depth of water applied per unit area
Ci = Salt content of irrigation water
Cd = Salt content of drained water
(E.C)i = Electrical conductivity of irrigation water
(E.C)d = Electrical conductivity of drained water.
Depth & Spacing of tile Drains
Where, S = Spacing of tile drains in m
k = Coefficient of permeability in m/s
q = Total discharge per unit length of tile drain m3/s/m
b = height of water table above the impervious layer
a = depth of impervious stratum below centre of the drain
Where, P = Annual rainfall in meter at a place.