Section 58(3)(b) in Bihar Inland Vessels Rules, 2013
(b)If the machinery is placed amidships, and additional space is available for passengers between the after bulkhead of the machinery space and a position near the stem of the vessels, to be determined by the Surveyor as suitable having due regard to the steering arrangements and fuel tank space, such shall also be considered for accommodating passengers. The breadths are to be measured at suitable intervals to the back of the side benches or to the inside of gunwale or to the inside of the half deck( where fitted) whichever measurement is least.