Year End Summary for 2017
******************************************************************************** MPCA/DNR Cooperative Stream Gaging Year End Summary Report Station: H40021001 - South Fork Whitewater River nr Dover, US14 Year: 2017 Station Manager: FRBOWEN Data Manager: ERJENZEN Prepared By: Erynn Jenzen (erjenzen) 651-539-2126 (ERYNN.JENZEN@STATE.MN.US) Approved By: Fred Bowen (frbowen) 651-539-2102 (FRED.BOWEN@STATE.MN.US) ******************************************************************************** Climate Summary -------------------------------------------------------------------------------- Data is only collected for a partial year at this site. Data collection began on 03/04/2017. Data collection ended on 11/01/2017. The ice out date was 03/04/2017. Snowmelt conditions: High and low temps rise above freezing on 3/4/2017 and remain near or above freezing for the remainder of the season. From 3/5/2017- 3/7/2017, the stage rose nearly 2ft before peaking on 3/7/2017 and descending again. Periods the stream was out of its banks: Using the bankfull stage of14.98ft noted at the 9/23/2016 inspection, there are 4 times throughout the year that the river was either at bankfull or out of banks: 4/19-4/20 (likely bankfull), 6/12 (bankfull), 6/28-6/29 (out of banks), and 7/20 (likely out of banks). Periods of low or no flow: Late August through early October had recorded stages of <12.2ft and the 9/13 flow msmt only reported 2.78cfs. The minimum recorded stage for the year was 12.02 on 9/23. Significant climatic events: 2017 Climate Summary - Southeast January http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201701&div=MN09 February http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201702&div=MN09 March http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201703&div=MN09 April http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201704&div=MN09 May http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201705&div=MN09 June http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201706&div=MN09 July http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201707&div=MN09 August http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201708&div=MN09 September http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201709&div=MN09 October http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201710&div=MN09 November http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201711&div=MN09 December http://www.dnr.state.mn.us/climate/historical/summary_csg.html?yyyymm=201712&div=MN09 Gridded Monthly Precipitation Totals: The synthetic data are made up of regularly-spaced grid nodes whose values were calculated using data interpolated from Minnesota's spatially and temporally irregular precipitation data base. Grids were prepared using the National Weather Service data from 1891 to 1972. For the period 1973 to the present, the High Spatial Density Precipitation Network (HIDEN) data (which includes NWS data) are used. http://climate.umn.edu/gridded_data/precip/monthly/csg_lookup.htm?site_id=40021001 HydroClim Minnesota is monthly electronic newsletter summarizing Minnesota's climate conditions and the resulting impact on water resources. http://www.dnr.state.mn.us/hydroclim/index.html The Hydrologic Conditions Report is prepared monthly by the DNR Division of Ecological and Water Resources and provides general information concerning the various water resources across Minnesota. The report places current values of precipitation, stream flows, lake levels and ground water levels in historical context. http://www.dnr.state.mn.us/current_conditions/hydro_conditions.html Flow Data Summary -------------------------------------------------------------------------------- Site visits to determine if the logger was tracking stage correctly were done at a frequency of 8 weeks or less. The stage record tracked correctly and was complete for the entire monitoring season. Other stage data collection factors: An offset had to be applied to correct the data from when it was reset while the line was frozen and a filter was applied when debris interacting with the orifice line from ice out through the end of May, but the record is still considered to be accurate and all open water data accounted for. 7 flow measurements were taken during the monitoring season. All recorded stage values were within the rating or less than 1 foot above the rating with no change in channel control. The highest msmt on the rating without a change in control 18.95ft on 9/22/2016. The highest recorded stage for 2017 was 17.98 on 6/26/2017 (out of banks). Flow measurements were taken this year with a maximum frequency of 4-5 weeks or with a frequency that accurately reflects seasonal conditions. Flow measurements cover less than 70% of the highest recorded seasonal/annual discharge. Flow measurements cover less than 40% of the highest recorded seasonal/annual discharge. Flow measurements cover less than 15% of the highest recorded seasonal/annual discharge. The highest computed discharge was 796cfs on 6/29/2017. The highest measured flow was 43.9cfs on 4/26/2017, 5.5% of the highest computed Q. Site visits to determine if the physical characteristics of the control changed during the monitoring season were done at a frequency of 5 weeks or less. A change in the physical characteristics of the control occurred at some time during the monitoring season. Change in control: A slight scour occurred following ice out and a series of late summer veg shifts were applied from August through October. Adequate flow measurements were taken to confidently adjust stage during period(s) of altered control. Precipitation Data Summary -------------------------------------------------------------------------------- The precipitation record either did not track correctly or was not complete for some parts of the monitoring season. In September, the rain bucket was determined to be under-reporting and subsequently, the data was removed from the dataset for this month. The overall precip total for the year compares well to an adjacent station. The annual total for this station (32.11in) is similar to that of nearby H40019001 (33.63in). At least three field visits were made to check the rain gage for obstructions during the monitoring season. There was no visual evidence or an indication from analysis of the precipitation data that the rain gage was plugged at any time during the monitoring season. Rain bucket noted as partially blocked during the inspection likely with little impact on the precip totals. Compared the occurrences and intensity of events with nearby H40019001 and W40038002, which match well with both sites. Did not remove any data from the set during this period of time. There were no vertical obstructions near the rain gage that may have compromised recorded rainfall values. The rain gage was not calibrated within the last three years. Water Quality Data Summary -------------------------------------------------------------------------------- No water quality samples were collected at this site during the monitoring season. -------------------------------------------------------------------------------- Data Quality for Calendar Year 2017 -------------------------------------------------------------------------------- Flow = Poor Archived Daily Value (QQC=32) Precip = Poor Archived Daily Value (PQC=32) -------------------------------------------------------------------------------- - EnteredBy - YESAPP