Home / Articles / Agri Engineering (page 5)

Agri Engineering

Units of Conversion

Length: 1 inch= 2.54 cm 1ft= 30.48 cm      = 0.3048m      = 3.281 ft 1m = 3.281 ft1mile= 1.609km1 naut mile= 1.852 km Area: 1 Are= 100sq.m          = 1 Gunta 1 Gunta= 33’X33’ 1 acre = 43560 ft2            = 4047 m2           =0.4047 ha1ha     = 10000m2           = 100 areas           = 2.471 Volume: 1Cu.ft= 28.32 …

Read More »

Benefits of Drainage System

1. Drainage Provides a Better Environment for Plant Growth: The excess water which impedes the root respiration and which directly attacks the root tissue of most crops is removed. 2. Increased Microbial Decomposition: The presence of air in soil is essential for the growth of beneficial soil bacteria which converts …

Read More »

Sub-surface Drainage

A sub –surface drainage system is required for water table control and for maintaining a favourable salt balance in crop root zone. It may comprise of buried horizontal pipelines, deep opne channels or a system of drainage wells. Sub-surface drainage may be obtained mainly by horizontal sub surface drainage systems …

Read More »

Surface Drainage

Surface drainage is the removal of water from the surface of the land. The water may be from excess rainfall, over irrigation, ,losses from conveyance channel and storage systems or seepage from areas at higher elevations. Flat or level land having impermeable sub –soil with shallow topsoil frequently requires surface …

Read More »

Drainage Co-efficient

The depth in centimeters of water drained off from a given area in 24 hours is called the drainage co-efficient. D.C = Total water discharge in 24 hrs (m3)           ______________________________             Total land area in sq. meters Ditch capacity (Discharge rate) = Total quantity of water discharged in 24 hrs (cum)                                                         …

Read More »

Drainage Pore Volume

It represents the volume of water that can be drained from a unit available volume of soil when the soil moisture pressure is decreased from atmospheric pressure to some specific negative pressure. Q= Sh1          h2 f(h) dhRelationship between drainable porosity and capillary pressure. q= S h1 ah.dh = a/2 (h1square …

Read More »

Definitions Related to Drainage Engineering

Drainage: The process of removal of excess surface or ground water from land by means of surface or sub-surface drainage. Hydraulic Properties of Soil: The Properties which are involved in water retention and transmission in soil i.e. specific water capacity (c), hydraulic conductivity (k)and soil water diffusivity (d). Diffusivity of …

Read More »

Types of Land Requiring Drainage

1. High water table- water table within 1.5m is usually not desirable. 2. When water stands on the land surface for long periods. Tolerances of crops to standing water vary widely. – 2-4 hrs for sensitive vegetables. Eq. Potato.1 day – for maize. 4 days for water tolerant grass crops. 3. In the …

Read More »