Record Details
page 126
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 126 Final supplement to the final environmental impact statement : Diamond Fork System, Bonneville Unit, Central Utah Project, page 126 |
| Coverage | Electronic reproduction; |
| Format | 126 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 IV consultation AND coordination discussed in the 1984 FES A description of sediment load and channel erosion impacts on the river with alternative C has been included in the final supplement NRXKN co coilfflitt T 2 two thirds of the water in diamond fork is the result of transbasin trans basin diversion from strawberry reservoir discuss the result of the increase in flow on channel ct ability stability and water quality SXSPONSZ VZSPCUSZ 2 flows in the upper 6 miles of sixth water creek from strawberry tunnel to the proposed last chance powerplant power plant will be significantly reduced under project operation due to the use of syar tunnel to convey transbasin trans basin diversions the maximum longterm average monthly flow from the strawberry tunnel will be reduced from about 280 fts ftvs ats to 7 ats fts ftvs and the maximum monthly flow will be reduced from about 420 fts ftvs ats to 30 ft ftvs 3s as this results in reduced channel erosion reduced sediment load and greater channel stability in this reach of sixth water A landslide in this reach has been a significant source of sediment due to the high tunnel releases undercutting the toe cf of the slide with the che greatly reduced flows the slide should have greater stability and the sediment contribution will be reduced flows in the lower 3.8 38 38 miles of sixth water creek from last chance power powerplact powferplaxt plact to monks hollow reservoir will be increased due to releases from the powerplant owerplan4 dower power plant piant maximum monthly flows will be increased from 420 ft Is s to 600 goo 60 0 ftvs ft31s chich 0hich r ich will increase channel erosion and sediment diment ss load in this re resh h this increase in sediment load would be offset by the reduction in the upper 6 miles resulting from significantly reduced flows flows and sediment load in diamond fork channel below monks hollow reservoir will be reduced under project pr ject eject operation average annual flow volume will be reduced about 40 percent and maximum monthly flow in an average year will be reduced by 38 percent due to the operation of 1 the he diamond fork pipeline sediment load in tons at the mouth of diamond fork will be reduced by 62 percent due to the retention of sediment in monks hollow reservoir the maximum monthly flow will be about the same as preproject pre project conditions this will result in less turbidity less channel erosion and greater channel stability INRZTTU HRZTTXH COMMKMT 3 alternative A suggests that sediment yield will be reduced 62 percent at the mouth of diamond fork channel capacity might be reduced as a result of sediment accumulation in the stream channel discuss the downstream effects of mobilizing and transporting this sediment during rare flood events RXCPONSK 3 the lower flows described in the response to written comment 2 and the trapping of sediment in monks hollow reservoir will result in less sediment transport which will reduce sediment accumulation in the char charnel nei net ngi in lower diamond fork operation of monks hollow reservoir will reduce flood peaks on diamond fork however during rare flood events flood peaks will not be 126 135 35 130 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/13051 |
