• Conductance = NOT conductivity  (conductivity is part of the conductance)
• Has to do with resistance

Formula: lwk*( (Hdrn - Haqfr)/b )

• l: length of drain
• w: width of drain
• k: Hydraulic conductivity of sediments
• b: Thickness of sediments (that's where potentail diff between Hdrn and Haqfr occurs)
• Hdrn: head drainage
• Haqfr: head aquifer      

Formula: Cond(uctance) = (l*w)/Centr = l*0.8/5 = l*0.16
Centrance = entrance resistance
inverse of k/b = entrance resistance(???)


Unit of conductance: (m2/d)/m when putting it in DRN package (bc it automatically calculates the *l [m]). Thus eventually conductance has units m2/d

Not only Cauchy, but also including its own water budget and flow eq, Manning equation

Outflow and inflow flow (open water flow visible) = open water flow (Manning)
Flow into aquifer = GW interaction
Head in stream are calculated, NOT fixed (advantage to RIV or DRN where you need to fix this) 

Stream has its own water budget

Explicit: Havg =  2/3(Hmax-Hditch)

Diffuse(upscaled): not indicated where real head build-up is and where ditches are, but take an average for this and first calculate the upscale affect of the ditch distance (L^2) and of the hydraulic properties of the subsoil (kD).

Cdrn = L^2/12kD [d]
Cond(uctance per cell) = (dx*dy*k)/dz = (dx*dy)/Cdrn = area/Cdrn [m^2/d]


Result from explicit and diffuse should on average be (approx) the same!