首页|Numerical Evaluation of the Constant-Head Borehole Permeameter Method for Stormwater Infiltration Design
Numerical Evaluation of the Constant-Head Borehole Permeameter Method for Stormwater Infiltration Design
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NETL
NSTL
Asce-Amer Soc Civil Engineers
The current standard of practice for sizing stormwater infiltration facilities typically relies on one-dimensional (1D) test methods that do not account for the full dynamics of groundwater flow, including lateral flow and capillary flow. Although some agencies allow methods that do account for lateral and capillary flow, these methods are relatively small-scale and may not replicate the effects of soil layering below a full-scale infiltration facility. The uncased and cased methods evaluated in this study account for lateral and capillary flow and can be used to evaluate both small-scale and large-scale infiltration tests in a broad range of test facilities, including excavated pits, uncased shallow boreholes, and deep cased wells. This study provides numerically calibrated shape factors for both glacially consolidated and normally consolidated soils that are generally considered suitable for stormwater infiltration [saturated hydraulic conductivity (K_s) > 0.1 m/day]. Soil sorptive numbers (α*), which quantify the degree of soil capillarity, were also calculated for the 10 representative soils evaluated in this study. Using the α* estimates and calibrated shape factors developed for this study, these methods can provide estimates of K_s with a bias range of 0.87-1.13 and an average bias of 0.99. Bias is the calculated K_s based on the constant-head borehole permeameter method divided by the specified K_s used in the numerical model. As demonstrated in this study, the constant-head borehole permeameter methods are well-suited for predicting the flow capacity of full-scale infiltration facilities.
NETL
NSTL
Asce-Amer Soc Civil Engineers
