Record Details
page 3-18
Digital Collections at BYU
| Field | Value |
|---|---|
| Title | page 3-18 Final environmental impact statement on the Provo River Restoration Project, page 3-18 |
| Coverage | Electronic reproduction; |
| Format | 3-18 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; phosphorus along the provo river and in deer creek reservoir EWPE 1993 1994 sowby and berg 1984 phosphorus levels in deer creek reservoir in the past have exceeded the jordanelle danelle Jor technical advisory committee JTAC target recommendations for phosphorus occasionally creating conditions that negatively affect recreational and aesthetic uses of the reservoir reservoirs as well as taste and odor problems in potable water supplies deer creek reservoir is mesotrophic meso trophic meaning it has intermediate nutrient availability and biological productivity phosphorus is believed to be the limiting nutrient for algae productivity in the reservoir woodward clyde 1995 and concentrated efforts have been made to reduce phosphorus loading to control nuisance algae blooms loveless 1993 As a result of these efforts nutrient water quality conditions in heber valley and deer creek reservoir have been improving during the past 15 years and reservoir conditions now meet state water quality standards construction of jordanelle Jor danelle reservoir is predicted to improve water quality in heber valley canals and streams and deer creek reservoir including reductions in sediment and phosphorus loads sowby and berg 1984 the reservoir was constructed with a selected level outlet works SLOW to help protect downstream water quality by allowing water to be selectively discharged from different layers in the reservoir based on temperature the water quality improvements predicted by sowby and berg 1984 were incorporated into the following baseline conditions sowby and berg projected a reservoir T TP concentration of 39 mgl mg1 mgt without sediment they projected sedimentation at approximately 50 percent per year correcting the projected concentration of 39 mg1 mgt for 50 percent sedimentation yields an in reservoir TP concentration of 20 mgl mg1 mgt this value closely matches the 1993 monitored epilimnetic epi limnetic concentration of 21 mgl mg1 mgt TP EWPE 1994 335.1 3351 3351 groundwater quality baseline groundwater quality was estimated using existing groundwater quality data and projected changes in irrigation volumes and irrigation water quality the estimated groundwater total phosphorus TP and nitrate NOs concentrations for an average water year are 0.046 0046 and 1.2 12 lt it mgl egl respectively the standard deviation ie a measure 3 of the variability of the data for n03 concentrations is 0.8 08 08 mgl egl and the maximum monitored concentration is 3.2 32 32 mgl egl hansen allen alien ailen ailon and luce 1994 3352 335.2 provo river 3352.1 33521 33521 nutrients and sediment baseline concentrations of TP total suspended solids TSS and NOs in valley streams and canals are presented in table 35 3 5 the effects of existing nonpoint non point source pollution activities in heber valley are reflected in the existing monitoring data and therefore are reflected in baseline conditions presented in table 35 3 5 nonpoint Non point source pollution causing activities in the valley that influence water quality are primarily agricultural but also include urban runoff for example the high nutrient and TSS concentrations found in lower lake creek reflect the nearby corrals winter accumulation of pollutants that discharge to the creek during snowbelt snowmelt snow melt and early spring and urban runoff from heber city one additional change under baseline conditions would be the acquisition and fencing of about 14.9 149 149 acres of agricultural land fencing would exclude livestock and reduce TP loads in the river by about 22 kgyr 48 ibsyr lbsyr ibser Ib lb syr this reduction is less than 0.2 02 02 percent of the annual TP load in the river and would not affect baseline concentrations 3352.2 33522 33522 temperature table 36 3 6 shows the equilibrium water temperatures for the provo river above deer creek reservoir in late summer under baseline conditions along with the percentage of each reach that has riparian vegetation these temperatures were estimated from summer monitored temperature in reach 2 when flows in the river were similar to late summer august flows predicted by the water resources analysis so the analysis incorporates the effects of the 125 cfs cs minimum flow 3353 5355 535.5 335.3 5353 3353 deer creek reservoir 3353.1 33531 33531 sediment table 37 3 7 summarizes baseline TSS and TP loads to deer creek reservoir from the provo river groundwater return flow and daniels creek during average hydrologic conditions the sum of the loads from the three sources equals the total baseline load from the impact area of influence to deer creek reservoir the provo river contributes a majority of the TSS and TP loads to the reservoir from the impact area of influence 18 |
| Identifier | http://cdm15999.contentdm.oclc.org/cdm/ref/collection/WesternWatersProject/id/7085 |
