West Fork of the White River Stream Restoration

West Fork of the White River Stream Restoration Monitoring Dan DeVun Ecological Conservation Organization [email protected] (501) 372-7895

Introduction Collect water quality samples before, during, and after the implementation of the restoration project at locations upstream and downstream of the restoration site.

Goals/Objectives - establish two water quality monitoring stations that are representative of the area and the restoration project

- accurately determine nutrient and sediment loading at the monitoring stations - determine the effects of the restoration project on water quality

- gain a better understanding for the chemical and physical dynamics of project area in the watershed LOADING

Requires daily DISCHARGE data, therefore continuous STAGE data. Requires daily sample concentrations. No USGS Station Problems

that we Flashy River, short and steep hydrograph. face River has no mercy on costly

instruments. Development of Discharge Rating Curve Sontec Rivercat Marsh McBirnney Flowmate 2000

Wading Rod Objective: Determine rivers discharge at as many different river stages as possible to generate a correlation between river stage and river discharge. Sampling Methods

Routine Sampling Composite samples One sample every 14 hours Storm Sampling

Composite samples One sample every two hours Triggers 0.5 ft rise in 3 hours

Grab sampling ~ 1 every 7 days Use auto sampler to continuously Monitor Stage

WF1 - approximately 1,500 ft upstream from the restoration site West of Hwy 71 Hwy 74 intersection 35 51' 3.07" N 94 6' 19.87" W.

WF2 - downstream of the restoration site Brentwood Mountain Road Bridge at the West Fork River 35 51' 33.18" N 94 6' 36.22" W.

Results Stage Discharge Rating Curve Sample Concentrations Loading Estimations

Stage Discharge Rating Curve Three Year Hydrograph Discharge Statistics

Discharge Statistics Sample Concentrations Analyses were determined from three types of samples; grab samples, composite samples and storm samples. Outliers for grab and composite

samples were defined and then removed from the data set (3*STDEV). Comparison of Sample Concentrations Statistical evaluations determined significance

between the sample concentrations of each type of sample and each parameter at WF1 and WF2. An analysis of variance test (ANOVA) was first used in the evaluations The Multiple Range Test was also used to investigate the statistical significances between

the three sample types using a 95% confidence level. Comparison of Sample Concentrations WF1 and WF2 - ANOVA

The grab samples and composite sample concentrations are statistically similar and show minimal variance Mostly, the storm sample concentrations are not equal to composite or grab sample concentrations.

Comparison between WF1 and WF2 Sample Concentrations Three statistical tests were performed to examine the correspondence between

samples collected at WF1 and WF2. The t-test The sign test The signed rank test WF1 compared to WF2

Grab Samples WF1 grab sample concentrations compared to the WF2 grab sample concentrations were all equal with the exception of SO4 concentrations at the 95%

confidence level. WF1 compared to WF2 Composite Samples WF1 composite sample concentrations compared to the WF2 composite sample

concentrations were all equal with the exception of turbidity values at the 95% confidence level. WF1 compared to WF2 Storm Samples

WF1 storm sample concentrations compared to the WF2 storm sample concentrations were all equal at the 95% confidence level.

Loading Estimations Pollutant loading was calculated at both monitoring sites from parameter concentrations and daily average discharge. Loadings were calculated for SRP, NO3-N, TSS, TP, TKN, NH3-N, SO4 and Cl-.

Concentrations from the grab, composite, and storm event samples were used to make the estimation. The periodweighted loading method was used. TSS Loading Storm Events verses Base Flow

Results Reg. 2 Turbidity Standard Base Flow <10 NTU WF1- 11% exceeded base flow target WF2 11% exceeded base flow target

All Flow <19 NTU WF1- 5% exceeded all flow target WF2- 6% exceeded all flow target Storm Samples WF1 81% exceeded all flow target WF2 80% exceed all flow target

Questions

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