Kevirê morkirina derî êgir di hundurê binê deriyê êgir de tê saz kirin. Dema ku derî girtî ye, ew ê bixweber mora guhezbar ber bi jêr ve dirêj bike da ku erdê bişkîne û valahiya di navbera binê derî û erdê de bigire. Kevirê morkirina deriyê agir nahêle ku dûmana jehrîn di nav valahiya li binê derî ya di destpêka agir de bikeve hundurê odeyê.

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