Are flow quantities presented per unit length?

All flow quantities are per unit length out of plane (into the computer screen). So, if your slope was 10m long out of plane (into the computer screen), you would have to multiply the flow values by 10 to get the actual amounts.

The same applies for pump values (with withdrawal rates in units of volume per time). All results are per unit distance out of plane. This would be like having an infinite line of pumps separated by a meter out of plane. If you have some out of plane spacing, you have to account for this in the values you use for flow/pump rates. For example, if the out of plane spacing is 2m, you would divide the pump rate by the out of plane spacing (2m) to get the pump rate per meter out of plane.