Abstract:
Relationship between ~eep tubewell spacing in square
grid tubewell layout and ~quifer characteristics has bsen
studied using unsteady ground water flow equations. Both
constant discharge and variable discharge condition,s were
considered and unsteady ground water flow equations were
solved with the help of an IB1 360 di~it81 computer.
Comparison ~msmade between SP:1cinrc:of ~Iells subjected to
mutual interference ann spacin{; of wells wj.thout interferenrJ8.
Discharge, coefficient of tr~nsmissibility. stor~ge coefficient,
time of pumping, static lift and peak monthly irrigation water
requirement have been used as variable parameters.
The ~tor~ge coefficient should be the determining factor in
selecting deep tubewell spacinG whon ~Tlifer characteristics
are considered. Soma amount of nutual interference is allowable
in seJ..ectin~deAp tube"el:l spf'.cingf'r.dnon_interference spacing
is not always practic~ble. It is not important to consider the
variability OI well discharge due to increase in drswdown at
the well with time,
A design chnrt has boen devoloped for the selection of
deep tc:;:;~:211 ~:"ncj n" f'''nRi deri n.CCflquifnr charr.cteristias rmd
irrigation water requirement in square grid tubewell layout.
