Sentence examples for drawdown error from inspiring English sources

Besides, to understand the aquifer disturbance and deviation in the observed drawdown values, the APE software provides automated values for the least-squares fit of the well yield and transmissivity, storage coefficient and average drawdown error by sensitivity analysis (McElwee 1980a, b).

Sensitivity analyses further indicate that only the general properties of the employed desaturation function need to be respected to significantly reduce errors in regional drawdown predictions that would arise if the presence of the near-well gas phase was ignored.

The study documented herein (1) quantifies errors in regional drawdown predictions incurred through neglect of the presence of a gas phase near CBM extraction centres, and (2) evaluates the extent to which these errors can be mitigated by simulating near-well desaturation using a modified Richards equation formulation within a standard groundwater flow simulator.

Where this function is employed in combination with the modified Richards equation strategy to accommodate near-well desaturation, errors in predicted drawdown are reduced significantly, including in cases where complexities such as sloping coal layers are introduced to the model domain (the latter promoting buoyancy-driven movement of gas).

Fitting errors between measured and analytically simulated water levels approximate the error associated with estimating drawdown during an aquifer test.

Using fitting-to-prediction error comparisons from hypothetical model results, the drawdown prediction error is likely less than 0.01 m.

The "premature withdrawal was the fatal error," Jeb said, referring to Obama's gradual drawdown, "creating the void that ISIS moved in to fill and that Iran has exploited to the full as well".

The "premature withdrawal was the fatal error," Jeb said, referring to Obama's gradual drawdown, "creating the void that ISIS moved in to fill — and that Iran has exploited to the full as well".

This is much less than the 0.007 m prediction error for well O2 between analytically estimated and known drawdowns where environmental fluctuations had been added to the known drawdowns (Table 2).

Fitting errors were constant between observation locations (0.004 m) whereas maximum drawdown estimates varied by up to 0.14 m.

The measured and computed drawdowns were compared to evaluate the efficacy of the developed spreadsheet programs and matching of the observed time-drawdown and type curves by employing two performance criteria: correlation coefficient (R) and root mean square error (RMSE).