|
The White River is an intermittent stream in the South Plains of Texas and a tributary of the Brazos River of the United States. It rises west of Floydada in southwestern Floyd County at the confluence of Callahan and Runningwater Draws. From there, it runs southeast for to its mouth on the Salt Fork of the Brazos River in northwestern Kent County. Besides these two headwaters, which rise near Hale Center and in Curry County, New Mexico, respectively, other tributaries include Pete, Crawfish, and Davidson Creeks.〔(【引用サイトリンク】title=Handbook of Texas Online: White River )〕 The White River drains an area of .〔 The river runs through Blanco Canyon, which it carved as it descends from the Llano Estacado. On October 9, 1871, Col. Ranald S. Mackenzie fought Quanah Parker in the Battle of Blanco Canyon on the river. South of the canyon, in far southeastern Crosby County, it was dammed in 1963 to create a lake, the White River Reservoir, which provides water for the towns of Post, Spur, Crosbyton, and Ralls.〔 The river was known to Spanish hunters and traders in Eastern New Mexico long before Anglo settlers arrived; the Spanish named the river ''Blanco'' (Spanish word for "white"), which it shares with the canyon and which has been anglicized to the present name.〔 The river has also been called the "Blanco Fork of Brazos River" or the "White Fork of Brazos River."〔Gray, G.A. 1919. Gazetteer of Streams of Texas. United States Department of the Interior, U.S. Geological Survey, Water-Supply Paper 448, p. 257.〕 Local anecdotes suggest the river level has been steadily declining due to local pumping and depletion of the Ogallala Aquifer: "you could catch fish in it until 1955.... Today the water is 80 feet down."〔(【引用サイトリンク】title=Discovering a Campsite in Texas ) 〕 ==Silver Falls== Where U.S. Route 82 crosses the White River, a roadside rest area with facilities and hiking trails is maintained by the Texas Department of Transportation. The central focal point of this park is Silver Falls where a spring-fed White River used to cascade over sandstone ledges.〔(【引用サイトリンク】title=Handbook of Texas Online: Silver Falls )〕 Springs that once flowed into the White River issued from the Ogallala Aquifer, which has been heavily tapped by the numerous farming operations on the Llano Estacado.〔Brune, G.M. 1981. Springs of Texas. Fort Worth, TX: Branch-Smith, 566 pp.〕 According to annual depth to water level measurements obtained by the High Plains Underground Water District, the water table beneath the Llano Estacado has declined at a rate of per year over the last decade. Over the twenty-year period from 1987 to 2007, the water table dropped a total of across the District.〔McCain, C. 2008. Depth-to-water level measurements. The Cross Section 54(4):1-2.〕 As a result of this depletion, the once gushing springs along this stretch of the White River have either dried completely or have been reduced to seeps. Lacking a steady base flow, the White River has ceased to flow and, today, Silver Falls is normally dry unless a strong thunderstorm happens to pass across the watershed. File:White River Silver Falls Texas 1891.jpg|A spring-fed White River flowing across Silver Falls in 1891.〔Dumble, E.T. (ed). 1892. Third Annual Report of the Geological Survey of Texas, 1891. Austin: Henry Hutchings State Printer, 410 pp.〕 File:White River Silver Falls Texas 2008.jpg|Due to agricultural pumping and resulting depletion of the Ogallala Aquifer, the White River no longer maintains a spring-fed base flow and, today, Silver Falls is often dry and overgrown by vegetation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「White River (Texas)」の詳細全文を読む スポンサード リンク
|