Arthashastra
पर प्रयुक्तायां वा सुरुङ्गायां परिखाम् उदक अन्तिकीं खानयेत्, कूप शालाम् अनुसालं वा ॥
when the underground tunnel has been made by the enemy for his own use, the water in the ditch outside the fort may be made to flow into it.
english translation
para prayuktAyAM vA suruGgAyAM parikhAm udaka antikIM khAnayet, kUpa zAlAm anusAlaM vA ॥
hk transliteration by Sanscript