21. The technical criteria applicable to main drainage systems depend on the hydrological situation and on the type of system. 22. Matilija Creek is Ventura River's most significant headwater and tributary, and adds to the length of the river's main drainage . 23. At the heart of the Noordoostpolder, where the three main drainage canals intersect, is the town of Emmeloord ( 1943 ). 24. An extensive network of drainage channels was created, the main drainage ditches being built to act simultaneously as canals for boats. 25. In 1912 during the construction of a main drainage scheme to Rathfarnham, a stone causeway was uncovered below the road level. 26. The main drainage of Muggins Wash which drains from the north-northwest contains areas of the " Peucephyllum ", the desert fir. 27. The Bush Estate was originally a simple holiday retreat, with just one well between the inhabitants and no mains drainage or power. 28. Many of the main drainages for the regions were sampled for placer gold by means of panned concentrates performed in the field. 29. Now called the " Kyk-Yodo River ", it is a major waterway in central Osaka and the main drainage of Neyagawa river. 30. New Marston seems to have received a mains water supply by the end of the 1870s and mains drainage by the 1920s.
