अपवाह क्षेत्र
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apavah kshetr zamin ka vah bhag hai, jo jal ka bahav ek nishchit jaliy marg dvara karata hai.
- yah ek bhaugolik jal ikaee hai.
- apavah kshetr mean dharatali jal ka nikas prayah ek hi disha mean hota hai.
- ye kisi mukhy nadi tatha usaki sahayak nadiyoan (saritaoan) ke jalagrahan kshetr haian.
- jal vibhajakoan dvara avaddh is kshetr ka jal sahayak nadiyoan dvara mukhy nadi mean pahuanchata hai.