Journal
GROUND WATER
Volume 43, Issue 6, Pages 943-946Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1745-6584.2005.00108.x
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A convolution integral is developed to evaluate transient, drilling speed-dependent discharge rates into a tunnel gradually excavated in a homogeneous infinite aquifer. Comparison with the classical instantaneous-drilling evaluation commonly used in practice reveals drastically reduced early-time discharge rates, higher maximum rates, and similar long-term rates. Dimensionless-type curves are provided to help assess total discharge sensitivity to drilling time and predict safer maximum flow rates.
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