<p>Placing gas extraction wells in a municipal solid waste landfill/dumpsite is essential to control landfill gas (LFG) emissions and recover the combustible-rich gas mixture. Estimating the number of gas extraction wells for a landfill/dumpsite is challenging. In the paper, the number of gas extraction wells required to recover LFG from two legacy waste dumpsites in Bengaluru has been studied. Recently developed first-order models based on waste degradation have been used to estimate the gas generation rate and cumulative gas generation from both dumpsites. The most recent gas flow model calculates the gas outflow rate from a single vertical gas extraction well. In this paper, the gas outflow model has been improved by adding a new parameter called the perforation density (<i>P</i>_d) to include the effect of the actual opening surface area of the gas extraction well. The current study shows that using <i>P</i>_d significantly affects the gas outflow rate. The gas flow rate decreases significantly when <i>P</i>_d is considered, which reduces the number of gas extraction wells required at a particular suction pressure. The number of gas extraction wells required decreases with the increase in suction pressure. The number of gas extraction well needed dumpsite DS1 and DS2 at 2&#xa0;kPa of suction pressure is estimated to be 6 and 22, respectively. The method presented in the study can be used to calculate the gas extraction wells requirement for any excavated landfill/dumpsites using the appropriate landfill data.</p>