یادداشت روز

14

قنات

قنات یا کاریز یا کهریز به مجرای تونلی شکلی که در زیر زمین کنده شده تا آب در آن جریان یابد می‌گویند. این مجرا که در عمق زمین برای ارتباط دادن رشته چاه‌هایی که از مادر چاه سرچشمه می‌گیرد به منظورهدایت آب و مدیریّت آب برای کشاورزی و سایر مصارف به کار گرفته می‌شود. این کانال ممکن است تا رسیدن به سطح زمین هزارها متر طول داشته باشند و سرانجام آب این کاریزها به روی سطح زمین می‌آیند که به این محل دهانه کاریز، سر قنات، یا مظهر می‌گویند.

فناوری ساخت قنات در اوایل هزاره اول قبل از میلاد در مناطق خشک کوهستانی ایران توسعه پیدا کرد و به کشاورزان این مناطق اجازه داد تا بتوانند در دوره‌های طولانی خشکی که آب سطحی پیدا نمی‌شود به کشت ‌و زرع بپردازند.

قنات به عنوان یک روش استحصال آب منافع متعددی دارد. اول اینکه بخش عمده کانال آب در زیر زمین قرار گرفته و در نتیجه هدررفت آب بر اثر تبخیر و نفوذ در خاک کاهش پیدا می‌کند. دوم اینکه نیروی سیستم از طریق جاذبه زمین تأمین می‌شود و نیازی به پمپ نیست؛ و سوم اینکه از آب‌های زیرزمینی به صورت تجدیدپذیر استفاده می‌شود که مزیّت سوم خود مَزیّت‌های دیگری را نیز به همراه دارد.




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