As shown in Fig. P8.73, a standard household water meter is incorporated into a lawn irr...

As shown in Fig. P8.73, a standard household water meter is incorporated into a lawn irrigation system to measure the volume of water applied to the lawn. Note that these meters measure volume, not volume flowrate. (See Video V8.14.) With an upstream pressure of p₁ = 50 psi the meter registered that 120 ft³ of water was delivered to the lawn during an “on” cycle. Estimate the upstream pressure, p₁, needed if it is desired to have 150 ft³ delivered during an “on” cycle. List any assumptions needed to arrive at your answer.