Laserfiche WebLink
<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />!,. <br />. <br />. <br />!. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I. <br />. <br />. <br />I. <br />. <br />. <br />. <br />. <br />I. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />Bosley Wash Drainage Master Plan Phase I: Watershed Floodplain Delineation <br />1_ -. """~_~,~_,n'''''y,,,,,_,,'iIJiii!ti0C_~~...., ' " <br />, ,I"f .. L' -'-'~~~i;lF~...,~_"";;,D,,\.;;';;';' <br /> <br /> <br />. Stub Ditch, operated by Mesa County Irrigation District <br />. Government Highline Canal, operated by the Bureau of Reclamation <br />. Price Ditch, operated by the Palisade Irrigation District <br />. Grand Valley Canal, Operated by the Grand Valley Irrigation Company <br /> <br />These ditches act as hydraulic baniers that impede or intercept the overland flow of water. <br />Portions of the Stub Ditch and the Price Ditch have been converted from open channels to pipes <br />in recent years, These ditches previously acted as drains for upstream flooding. The Bureau of <br />Reclamation's Salinity Project then constructed facilities on top of the pipes to capture and <br />reroute local drainage to Bosley Wash, the roughly north-south trending drainage ditch that <br />conveys stormwater from Stub Ditch within the Bosley Wash Basin, <br /> <br />Bosley Wash crosses the Government Highline Canal via a siphon and a number of small <br /> <br />diameter culvert crossings draining subbasins to the east. For the purposes of this report, it was <br /> <br /> <br />assumed that the Government Highline Canal intercepted no stormwater. However, reports <br /> <br />indicate that overtopping of the canal embankment may in fact occur, <br /> <br />2.3 Basin Storage <br /> <br />Drainage features within the Bosley Wash Watershed are incapable of handling large flood <br /> <br />events. There are also a number of hydraulic structures throughout the watershed, most notably <br /> <br />along 1-70, which are incapable of conveying all flood flows, but which significantly attenuate <br /> <br />peaks as a result of inadvertent and unregulated storage, <br /> <br />3. PRECIPITATION <br /> <br />Major flooding on the Bosley Wash Basin is the product of high intensity thunderstorms, <br />Rainfall amounts for the hydrologic simulations in this study were derived from the NOAA <br />Atlas, <br /> <br />"..~~ <br /> <br />i~ '-~~~t~~~.IDr:;\,;~!-(,s:'-~ <br /> <br />e ~ <br /> <br />Page 4 <br /> <br />lill <br /> <br /> <br />~~~, <br />{1~!'6_i.Dii;";\';-J <br />