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locha [Assamese েলাচা]

In Assam, India, ? – 21^st century, a unit of land area, = ¹⁄₂₀th of a katha = ¹⁄₁₀₀ bigha = 16 square yards = 144 square feet, about 13.38 square meters. Also romanized as lochha, lecha and lasas.

sources

Lochhá, Asam. () A land measure in Asam equal to 11½ feet square.

H. H. Wilson, 1855, page 312.

েলাচা … a measure of land eight cubits square.

M. Bronson.
A Dictionary of Assamese and English.
Sibsagor: American Baptist Mission Press, 1867.
Page 505.

Eight cubits is a half foot larger than 11½ feet. Perhaps the difference reflects the standardization of an old unit by the British administration.

েলাচা … a measure of land containing four square yards [caution, incorrect-ed.] or one-hundreth part of a bighā.

University of Gauhati.
Candrakanta abhidhana : Asamiyi sabdara butpatti aru udaharanere Asamiya-Ingraji dui bhashara artha thaka abhidhana. 2nd ed.
Guwahati: Guwahati Bisbabidyalaya, 1962.
Page 829.

The definition stumbles on the difference between four yards square (that is, an area of 16 square yards) and four square yards. The Assamese bighā is 1600 square yards. One-hundreth of that is 16 square yards, or 4 yards square, or 8 cubits square.