Anisotrop factor -ratio of Kv/Kh

Hi everone,
Currently, I am calibrating a seepage face and flow rate towards a
quarry site using cross sectional model (2D) - SEEP /W model. the model has been
calibrated well against the measured flow rate and groundwater level
from three observation bores along the section. I wonder if the ratio
Kv/Kh ~ 500 is realistic. The aquifer is sandy gravel overain by sandy
material.
I would like to justify this ratio and see if there are case studies,
documents relevant to  the ratio of hydraulic conductivity ( vertical
vesus horizontal).
Could this be a none- uniqueness problem with model calibration.


Regads
Yohannes
Melbourne, Australia

Hy Johannes
sorry but I think your ratio more than unrealistic, is actually impossible in plain - parallel layered sedimentary deposits.
Are those deposits strongly cemented and vertically fractured ? If that is not your case, check your boundary conditions or if a 2D vertical modelling is really suitable.
Yours
Gianmarco

Hi Yohannes,

Have you some marly layers ? Or is all sand and gravel? Anyway even if you have marls, I agree with Gianmarc that 500 is a lot, base on what I read the ratio is more about 50-100. Perhaps could you increase your recharge?

Cheers,
Robin