A NUMERIC MODEL FOR HYDRAULIC PARAMETER ESTIMATION
IN LOW YIELDING FORMATIONS

Presented at:

The Fractured Rock Conference
Denver, Colorado
March 2002

 

 

GONZALO PULIDO-SILVA
Department of Civil Engineering, National University of Colombia,
Bedrock Bioremediation Center
Ph.D. Candidate, University of New Hampshire

THOMAS P. BALLESTERO
Associate Professor, Department of Civil Engineering
Bedrock Bioremediation Center, University of New Hampshire

ABSTRACT- A Finite – Differences Model was developed to estimate Hydraulic Conductivity (K) and Storage Coefficient (S) from flowrate-drawdown-time data in a tested well with or without monitoring wells. The numeric model takes into account an initial dynamic water level, well storage, and flowrate variations during pumping. In particular, these conditions are typically found during the well purging required for Packer Water Sampling (PWS) in Low Yield Formations (LYF). The numerical model allows the use of PWS data as a Pumping Test (PT). the model was validated with Theis and Jacob methods for small diameter wells, and the Papadopolus method for large diameter wells. It was calibrated with hydraulic results from pumping tests (that included observation wells). An application of the model was to estimate K and S during PWS at a LYF Fractured Bedrock; the results were compared with slug tests analysis. A downloadable version for the model and six examples are available below.

HYTESTS.exe (119KB)

Users' Manual (Word Doc)

LargeDia.hyt (549B)
Leakage.hyt (683B)
Recovery.hyt (71KB)
Theis_Ja.hyt (7KB)
Valida01.hyt (5KB)
Valida1.hyt (2KB)

 
 

 

 

 

 
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