$(20)$ Using the figure below and the EPANET output on the last page of the exam, answer the following questions. $1cfs=448\mathrm{.}8gpm$

a$)$ Compute the pressure at junction J$-4$ in psi

b$)$ What is the magnitude and flow direction of pipe $9?$ Draw a flow arrow on the pipe to show the direction.

c$)$ Compute the total head at node $J-8$

d$)$ Compute the length of pipe $2$

e$)$ What is the flow rate from $R-1?$

$\backslash$table$[[,$Elevation,Demand,Head,Pressure$],[$Node ID$,$ft$,$CFS$,$ft$,$psi$],[$Junc $2,27,0\mathrm{.}68,118\mathrm{.}80,39\mathrm{.}78],[$Junc $3,22,0\mathrm{.}00,118\mathrm{.}56,41\mathrm{.}84],[$Junc $4,26,0\mathrm{.}51,118\mathrm{.}41,],[$Junc $5,,,,37\mathrm{.}77],[$Junc $6,34,0\mathrm{.}17,118\mathrm{.}60,36\mathrm{.}66],[$Junc $7,,1\mathrm{.}02,,38\mathrm{.}34],[$Junc $8,24,0\mathrm{.}17,117\mathrm{.}66,40\mathrm{.}58],[$Junc $9,29,0\mathrm{.}43,,37\mathrm{.}89]]$

$\backslash$table$[[,$Length,Diameter,Roughness,Flow,Velocity,$\backslash$table$[[$Unit$],[$Headloss$]]],[$Link ID$,$ft$,$in$,,$CFS$,$fps$,$ft$/$Kft$],[$Pipe $1,1200,18,110,3\mathrm{.}32,1\mathrm{.}88,1\mathrm{.}00],[$Pipe $2,,,,0\mathrm{.}57,0\mathrm{.}53,0\mathrm{.}16],[$Pipe $3,800,16,100,1\mathrm{.}49,1\mathrm{.}07,0\mathrm{.}48],[$Pipe $4,1550,12,100,0\mathrm{.}49,0\mathrm{.}62,0\mathrm{.}25],[$Pipe $5,1205,14,100,0\mathrm{.}58,0\mathrm{.}54,0\mathrm{.}16],[$Pipe $6,850,8,100,0\mathrm{.}41,1\mathrm{.}18,1\mathrm{.}30],[$Pipe $7,,,100,-0\mathrm{.}38,1\mathrm{.}08,],[$Pipe $8,640,12,100,0\mathrm{.}60,0\mathrm{.}76,0\mathrm{.}36],[$Pipe $9,940,6,100,,0\mathrm{.}72,0\mathrm{.}73],[$Pipe $10,1430,6,100,0\mathrm{.}08,0\mathrm{.}42,0\mathrm{.}27],[$Pipe $11,550,,,-0\mathrm{.}09,0\mathrm{.}45,0\mathrm{.}31],[$Pipe $12,,,,0\mathrm{.}43,0\mathrm{.}78,0\mathrm{.}47],[$Pipe $13,750,6,100,0\mathrm{.}26,1\mathrm{.}34,2\mathrm{.}30],[$Pipe $14,,,,,,]]$