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Jadawalin girman rai

Masu lura da yanayi suna kwatanta ƙwayoyin rai da abubuwan yau da kullum. Sabis ɗin Yanayi na Kasa yana amfani da waɗannan girma a cikin rahotannin guguwa; rai na inci 1 (girman kwata) ko fiye yana da tsanani.

Girman kankara	Milimita	An kwatanta da	Mai tsanani
0.25 inci	6 mm	wake
0.5 inci	13 mm	marmara
0.75 inci	19 mm	Tsabar kobo ɗaya
0.88 inci	22 mm	Tsabar kobo biyar
1 inci	25 mm	Tsabar kudi ta 25-cent	✓
1.25 inci	32 mm	Tsabar kudi ta 50-cent	✓
1.5 inci	38 mm	ƙwallon ping pong	✓
1.75 inci	44 mm	ƙwallon golf	✓
2 inci	51 mm	ƙwai na kaza	✓
2.5 inci	64 mm	ƙwallon tennis	✓
2.75 inci	70 mm	ƙwallon baseball	✓
3 inci	76 mm	kofi na shayi	✓
4 inci	102 mm	grapefruit	✓
4.5 inci	114 mm	ƙwallon softball	✓

Rai na kimanin inci 1 zai iya lalata motoci da kuma lalata tsofaffin shingles; rai na girman ƙwallon golf (inci 1.75) ko fiye sau da yawa yana karya tagogi, skylights da siding. Yadda guguwa take lalata abin da ya faru ya dogara da iska da shekarun rufin.