Record Details
page 3-24
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3-24 Diamond Fork System Final Supplement to the Final Environmental Impact Statement, page 3-24 |
| Coverage | Electronic reproduction; |
| Format | 3-24 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 quality strawberry reservoir both temperature and phosphorous concentrations may depend on the presence of reservoir stratification in distinct layers formation of a thermocline in deep water bodies this stratification can occur seasonally if stratification occurs water drawn from above the thermocline would have a different temperature and phosphorous concentration than water drawn from below above thermocline temperatures would be more influenced by ambient air temperatures lack of thermocline formation or natural mixing during spring and fall result in a more uniformly mixed condition two scenarios were analyzed for stratification dependent parameters below a depth of 33 feet average of values below the potential thermocline during stratification and mixed conditions average of all depths the potential range of phosphorus dissolved oxygen and temperature impacts is thus defined by presenting two endpoints end points which assume that all water would be either released from below the potential thermocline depth or from mixed water low DO concentrations associated with releases of water from below a thermocline may result in low instream stream in DO however this effect may be minimized or reduced by reaeration re aeration within the stream channel A simple model was used to determine the effect of aeration reaeration re on stream dissolved oxygen for baseline proposed action and no action alternative flow regimes the model uses a logarithmic model with a aeration reaeration re rate coefficient flow velocity and initial conditions to calculate the DO at any location along the reach the aeration reaeration re coefficient was obtained from empirical relationships based on temperature velocity and flow depth this model was used to calculate distance weighted average DO for each stream reach the impact tables present the estimated worst cases for ammonia baseline ammonia decreases downstream are partially attributable to aeration however no attempt was made to correlate increased future flow aeration with reduced ammonia under the proposed action or no action alternative increases in ammonia in spanish fork river from spanish fork diversion dam to utah lake could be attributed to nonpoint non point sources of nitrogen entering the river system although no measurable changes in ammonia are estimated for any of the locations lowering the water temperature in some locations could reduce some baseline ammonia exceedances exceed ances of standards sediment transport for diamond fork and sixth water creeks was the subject of a recent study by the CUWCD CUWCD 1997b 1998e mean monthly sediment loads and sediment loads as a function of strawberry tunnel discharge and river flow were measured regression analysis was used to determine the relationship between sediment load and concentration as a function of flow these data were then used to estimate sediment impacts at selected locations based on a regression analysis relating sediment load to flow conditions 336.2 3362 3362 significance criteria significance of water quality impacts are determined by whether or not water quality standards shown previously in table 34 3 4 that are currently met would be exceeded whether standards that are exceeded would be improved or whether exceeded standards would be further degraded the standard for turbidity in which changes in turbidity should be less than 10 NTUs strictly applies to point sources of turbidity and generally is not applicable to the nonpoint non point changes expected under the proposed action and no action alternative changes in turbidity are directly related to changes in flow turbidity significance cannot be quantified based on average data the significance of water quality impacts with respect to related resource areas are evaluated in the sections that deal with these related resources 336.3 3363 3363 potential impacts eliminated from further analysis the water quality technical memorandum attachment H CUWCD 1999f covers the transfer of bonneville unit water to utah lake for exchange to jordanelle Jor danelle reservoir these data indicate the TDS levels in utah lake are less than or equal to baseline conditions therefore there would be no impact on TDS in utah lake diamond fork system FSFEIS FS FEIS 324 3 24 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/10429 |
