<p>This Architectural Drawing is of Tunnel Portal Detail Drawing. Aqueduct: In an aqueduct, the canal bed level is <strong>above the drainage bed level</strong> so canal is to be constructed above drainage. A canal trough is to be constructed in which canal water flows from upstream to downstream. This canal trough is to be rested on number of piers. The capacity of a canal is <strong>the maximum discharge that can safely be transported</strong>. This means that when the discharge equals the capacity, the water level reaches the minimum required free board level. <strong>To exercise control on discharge, full supply level, velocity of flow, silting etc.</strong> <strong>various masonry or concrete structures have to be constructed over the canals</strong>. All these structures are know Canal Regulation Works. For more details and information download the drawing file.</p>