متى يتم عمل
manhole Drop
فى خطوط الصرف الصحي ؟
فى حالة زيادة ارتفاع ماسورة الدخول عن ماسورة الخروج بمقدار 1م ولتفادي النحر والتآكل في جدران المنهول يتم عمل مشترك على هيئة حرف
"T " او " Y "
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