अपवाह (Drainage) NCERT भूगोल कक्षा 9 अध्याय 3 – विस्तृत सारांश परिचय अपवाह (Drainage) का अर्थ किसी क्षेत्र की नदी व्यवस्था से है। एक मुख्य नदी और उसकी सहायक नदियाँ मिलकर नदी तंत्र बनाती हैं। भारत की नदियाँ कृषि, सिंचाई, जलविद्युत, परिवहन और मानव जीवन के लिए बहुत महत्वपूर्ण हैं। भारत की नदी प्रणाली को मुख्य रूप से दो भागों में बाँटा गया है: हिमालयी नदी प्रणाली प्रायद्वीपीय नदी प्रणाली 1. हिमालयी नदी प्रणाली मुख्य हिमालयी नदियाँ: सिंधु गंगा ब्रह्मपुत्र विशेषताएँ ये सदानीरा नदियाँ हैं (साल भर बहती हैं) इनका जल स्रोत हिमनद और वर्षा दोनों हैं लंबी और गहरी नदियाँ बड़े मैदान और डेल्टा बनाती हैं A. सिंधु नदी प्रणाली Indus River का उद्गम तिब्बत में मानसरोवर झील के पास से होता है। मुख्य विशेषताएँ यह भारत, तिब्बत और पाकिस्तान से होकर बहती है कुल लंबाई लगभग 2900 किमी इसकी प्रमुख सहायक नदियाँ: झेलम चिनाब रावी ब्यास सतलुज महत्व सिंचाई के लिए अत्यंत महत्वपूर्ण पंजाब क्षेत्र की कृषि का आधार B. गंगा नदी प्रणाली Ganga भारत की सबसे महत्वपूर्ण नदी मानी जाती है। उद्गम गंगोत्री हिमनद (उत्तराखंड) से नि...
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