Di 35[cm] "Inner pipe diameter"
Lj 4[m] "Length of junction"
L1 70[m] "Length of pipe 1"
L2 15[m] "Length of pipe 2"
L3 30[m] "Length of pipe 3"
L4 25[m] "Length of pipe 4"
rbend "5 [cm]" "Inner radius of the bend"