Record Details
page 3.2-20
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3.2-20 Finding of No Significant Impact Lake Fork Section 203 Alternative : Proposed Action, page 3.2-20 |
| Coverage | Electronic reproduction; |
| Format | 3.2-20 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; water supply average annual diversions for twin pots reservoir total about 3800 ac ft or about 4 percent of the average annual inflow above moon lake reservoir the reservoir operated and maintained by the moon lake water users association is typically drained by the end of the irrigation season with only the dead inactive pool remaining twin pots reservoir is surrounded by glacial moraine that consists of unsorted and unstratified gravel sand and silt the thickness of the moraine deposits appears to be several hundred feet at the reservoir site and likely contains shallow unconfined groundwater that is recharged locally by reservoir seepage and snowmelt snowbelt snow melt infiltration 32.4 324 324 impact analysis 324.1 3241 3241 3291 potential impacts eliminated from further analysis under the proposed action and both action alternatives construction related impacts would be essentially the same and would include minor water use and temporary stream diversion activities A small amount of water would be used to construct the project features proposed construction impacts on water quantity would be negligible compared to available water supplies in the fall preceding the summer construction season the outlet works for each high mountain lake proposed for stabilization would be left open to allow each lake to be drawn down to its lowest level and to pass subsequent lake inflows downstream surface water hydrology during lake stabilization would not be affected because lake inflows would be diverted around the work site and released downstream dam embankment materials removed would be spread over an area near the embankment and below the high water line stabilization of the high mountain lakes would not begin until big sand wash reservoir enlargement is completed and water would be available for irrigation purposes both big sand wash and twin pots reservoirs are existing offstream off stream facilities construction work related to increasing the capacity of big sand wash reservoir would occur primarily outside the existing reservoir and would not affect or have minimal effects on current reservoir operations twin pots dam rehabilitation activities would occur primarily in and near the reservoir area during the construction period up to 4050 ac ft of water would be unavailable for irrigation purposes because the reservoir would be drained prior to rehabilitation of the dam new diversion structure construction would not impact hydrology because no significant change in river flows would occur concrete used to construct the big sand wash feeder diversion structure would be placed during low flow periods from march through may and october through december enlarging big sand wash reservoir likely would not change any local groundwater conditions because the reservoir overlies oberlies over lies relatively impermeable bedrock of the duchesne river formation no significant adverse effects on groundwater are expected groundwater recharge during the winter would be less in the lower reaches of the lake fork river because of river flow reductions the reduction in groundwater recharge during winter is anticipated to be minor although the amount cannot be quantified with the available information the river alluvium in the lower subunit of the lake fork river 3220 32 20 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/12054 |
