این ضابطه با هدف ارائه روش‌ها و اصل محاسبه حداکثر بارش محتمل (PMP) تهیه گردیده است. با توجه به این‌که روش‌های برآورد، به نتایج مختلفی منتهی می‌گردد که گاه می‌تواند اختلافات فاحشی را ایجاد کند، این دستورالعمل یکنواختی و هماهنگی لازم را جهت پیش‌بینی‌ها ارائه می‌دهد.
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