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ক্ষয় ও সঞ্চয় কাজের মাধ্যমে নদীর ধীরে ধীরে ভারসাম্য অবস্থায় আসাকে গ্রেড বলা হয়।
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ক্ষয় ও সঞ্চয় কাজের মাধ্যমে নদীর ধীরে ধীরে ভারসাম্য অবস্থায় আসাকে গ্রেড বলা হয়।