Equations of steady drawdown, seepage velocity, quasi steady time and ideal well distance were obtained through analytic seepage equation.

通过分析理论解，从中得出稳态降深方程、稳态渗流速度方程、准稳态时间方程和理想井间距方程。

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He said at the time that he would begin the drawdown of the surge forces in July of 2011.

WHITEHOUSE: Press Briefing

The final decision about the pace of the drawdown in Afghanistan was not made at the time the FY 2014 Budget request was developed.

WHITEHOUSE: Letter -- Fiscal Year 2014 Budget Amendments

They are now planning a drawdown of troops there in just over a year's time.

BBC: Taliban's Mullah Nazir death spells trouble for Pakistan