Experiment-1
INFILTRATION GALLERY
(With
one infiltration well, one straight gallery pipe one inspection well and one
jack well)
Aim:-
To
draw the infiltration gallery using AutoCAD software.
INFILTRATION
GALLERY:
An
infiltration gallery is essentially a porous barrel placed with a pervious
layer. water is collected in the gallery and led to a well called jack well
placed at the river bank which acts as a sump . the water from the well is
pumped out .The Infiltration gallery consists of a single or double row of
loosely jointed perforated pipes .normally stone ware or concrete pipes are
used. All around the galley a medium of graded sizes of aggregate is provided.
the aggregate acts as a filter and prevents the sand from entering the gallery.
the
gallery is laid below the lowest ground water level in the aquifer. the gallery
should also be located below the scour level of the river . the layers above
the gallery should not be disturbed even during floods. because it acts as an
initial filter. Manholes
are
provided for inspection at required intervals.
INFILTRATION
WELLS:
an
infiltration well is a well sunk in a river or stream bed. they are taken
deeper than infiltration galleries .
if
masonry Walls are constructed then open joints are provided . The top of the
well is taken well above the river bed and provided with an RCC slab.The number
of wells to be provided in the riverbed depends on the demand of water . Water
from the
infiltration
wells is pumped to a common sump calledjack well.
Problem:
The
particulars of an infiltration gallery are
River
bed level - +50.00m
Inner
Diameter of infiltration well - 3.80m
Outer
diameter of infiltration well - 4.70m
River
bank level - +53.70m
Maximum
flood level (MFL) - +52.90M
Lowest
summer water level (LSWL ) - +48.60M
Invert
level of stoneware pipe - +44.00m
Diameter
of stone ware pipe - 400m
Length
of one gallery - 60.0m
Width
of gallery - 2.20m
Layer
of filter media adjacent to the pipe - 150m
Next
two layers are of 100 mm each
(size
of particle of filter media in each layer is increased from outer to the inner
layer) Inner diameter of jack well cum pump house -6m
Outer
diameter of jack well cum pump house -6.90m
Inter
diameter of inspection well - 2m
Outer
diameter of inspection well - 2.60m
Any
more data required may be assumed suitably . Draw the following views to a
suitable scale.
1.
general layout of the scheme showing infiltration wells, infiltration
galleries, inspection wells,jackwell and pump house (not to scale )
2.
Longitudinal section of infiltration well, one straignt gallery, one inspection
well and one jackwell.
3.
Sectional plan of infiltration well, gallery, inspection well and jackwell.
4.
Cross sectional details of infiltration gallery. Assumptions:
1.
inspection wells or manhole wells. are duge at intervals of 50 to 60m.
2.
Diameter of gallery pipe : 300mm to 450mm
3.
Diameter of inspection wells : 1m to 2m
4.
Diameter of infiltration wells : 2m to 6m
5.
Depth of infiltration portion of infiltration well :5mbelow L.S.W.L.
6.
Minimum width of gallery :2m
7.
Minimum depth of gallery : 2m below the lowest summer water level.
8.
Rate of infiltration for wells and galleries : 4500 to 6000 lit/m2/day.
Procedure:
1.
switch on the computer
2.
Open Auto CAD 2014
3.
Setting units & Setting Dimension.
(
ii) set the unit as decimal & millimeter
4.
Setting limits
5.
Zoom – All
6.
Using circle command draw Infiltration well
inspection
well Jack well with pump house
7.
for wall thickness use offset command
8.
For filter media fill with hatch command
Result:
Thus
the infiltration gallery are drawn using Auto
CAD
2014 software
Download pdf & dwg File Of this Drawing.....................
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