Record Details
page 21
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 21 Central Utah Project, Bonneville Unit : Diamond Fork Power System : final Environmental Impact Statement, page 21 |
| Coverage | Electronic reproduction; |
| Format | 21 text/PDF |
| Rights | Brigham Young University; http://lib.byu.edu/about/copyright/generic.php Public Domain Public |
| Language | English; eng; en |
| Relation | Central Utah Project; Western Waters Digital Library; CHAPTER II 11 NEED FORACTION FOR ACTION flood damage and erosion flood damage in the form of channel erosion occurs annually in the diamond fork drainage system prior to 1983 more significant flood damage to roads campgrounds and agricultural lands occurred about once every 10 years significant damage within the canyon occurred during both the 1983 and 1984 spring runoff seasons the most critical flood producing situation is a snowmelt snowbelt snow melt and rain combination the highest peaks of record on diamond fork have occurred in the springs of 1952 1610 cfs cs 1983 about 1600 cfs cs and 1984 about 2000 cfs cs the 1984 value is estimated and cannot be verified because of a loss of the gage andrecord andrenord and record limited local damage may result from thunderstorm runoff since the operation of strawberry tunnel began most of the peak flows have resulted from tunnel releases rather than snowmelt snowbelt snow melt or storm runoff the highest flow at the strawberry tunnel outlet was 595 cfs cs in 1923 floodflows Flood flows from diamond fork can contribute to flood damage along the spanish fork river peak flows measured on the river near castilla were 3610 cfs cs cf s in 1952 2890 cfs cs cf s in 1983 and about 4200 cfs cs cf s in 1984 the 1983 peak was reduced by approximately 1000 cfs cs because of the thistle slide impoundment the floodflows flood flows caused damage to the river channel the highway the railroad and agricultural properties in spanish fork canyon in addition the 1983 and 1984 floods threatened the spanish fork diversion dam and the strawberry power canal the diversion dam was damaged when sediment and debris plugged the flood gates and high flows overtopped overtapped over topped the dam the power canal was endangered and the maintenance road damaged when the riverbank was severely under cut by the high flows numerous acres of farmland were destroyed as the river channel shifted and cut through farm fields releases from the strawberry tunnel have resulted in higher than normal sediment transport through sixth water creek and diamond fork this sediment results from natural tributary inflow and some bank slough ing during high spring runoff and during periods of large releases from the tunnel the sediment is then transported downstream by early summer releases from the tunnel causing high turbidity levels particularly in the early part of the irrigation season the sediment decreases toward the end of the irrigation season as flows decrease 21 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/3900 |
