Size, Survey and
Measurement
The main aim of
watershed is to conserve rainwater in situ and made available to the crops. Therefore, it
requires very careful management including identification of priority to the particular
area, selection of site, survey, soil water conservation and tank or Water Lake (Talav).
Selection of Site
First select the site
for water tank that can be built at the nala and then fixed the area of watershed. For
this noted the places from which water has come and then fixed the circumference of the
area. Area of watershed should be 100 hectare or smaller than 100 hectares when it is
taken at village level.
Survey
After selection of
site or area for watershed prepare contour map. From contour map watershed area is fix.
Also it indicates slope, hills, and nala. It is also helpful for planning development
work. Another map showing soil, depth, slope should be prepared. For watershed planning,
these two maps are very essential.
Soil and Water Conservation
In watershed first
decide which types of soil and water conservation works can be taken while going from hill
to plain. Generally prepared for high slope bench terrace, medium slope and having sloped
less than 3% bunding across the slope. If there is highly undulating or having high slope
at the base, prepare terrace having to slow run off and water should end into the nala.
After forming various bunds, provision for drainage into the nala should be prepared.
Water Lake
In Watershed area
first select the site for water lake above the nala and then fixed the watershed area. It
should be noted that is their sufficient water for lake, sufficient run off of water. Site
of water lake should have no use for cultivation. Also there should be provision for run
off of excess water. This lake helpful in increasing the water in the wells, and to bring
the 20-30% land under irrigation. |
Ag.
Technologies
(Agricultural
Engineering)
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