Alba, Mill race in Častolovice, Czech Republic

Alba is a mill race in the Czech Republic that branches off the Bělá River at the southern edge of Častolovice and flows into the Dědina at Třebechovice pod Orebem. Its channel is 1.5 to 3 metres wide and runs 17.4 km through the districts of Rychnov nad Kněžnou and Hradec Králové. In places it forms meanders, pools and oxbow arms.

The canal was built before 1400 and is one of the oldest structures of its kind in the Czech Republic. For centuries it supplied water to mills, sawmills, and fish ponds, shaping the region's agricultural and industrial practices since medieval times.

The Alba is a narrow mill race, 1.5 to 3 m wide, with a technical capacity of 0.6 m³/s and an average flow of about 0.35 m³/s. A water divider below the Olešnický potok confluence at Čestice caps the flow at 0.45 m³/s, and at Týniště nad Orlicí most of the water is diverted through an relief channel to the Orlice. Walkers can follow the channel from Častolovice through Čestice, Lípa nad Orlicí and Týniště nad Orlicí to Třebechovice pod Orebem, where it meets the Dědina; the Choceň–Meziměstí railway crosses it at Petrovice.

The lower mill in the centre of Týniště nad Orlicí, documented since the late 14th century, was rebuilt in 1911 as the town's electricity works. At the water divider near Týniště most of the Alba's water is led away through a relief channel across the town to the Orlice, so little reaches the mouth at the Dědina.