U.S. Department of the Interior U.S. Geological Survey Implementation of the U.S. Geological Survey’s StreamStats Program in Kansas— A Web Application for Streamflow Statistics and Basin Characteristics Kansas Water Science Center Jenny Lanning-Rush, Geographer

Flood Frequency Analysis  USGS routinely publishes reports that provide predictor equations that correlate discharge to other independent geomorphologic and climatic basin parameters for much of the United States.  The multivariable linear regression equations for estimating the magnitude and frequency of peak discharges in rural ungaged streams are periodically updated to account for additional years of record  These regional flood-frequency regression equations are used by engineers, ecologists, public works directors, and many others in their day-to-day work

Regional Regression Analysis Input Variables require extensive time and computational resources to compute Equation for estimating the 100-year peak flow (the peak flow that has a 1 percent probability of being exceeded in any given year) from Rasmussen and Perry takes the form: Q 100 = 0.810(CDA) (P) (S) (Sl) where: CDAis the contributing drainage area for the site, in square miles Pis the average annual precipitation for the entire drainage area, in inches Sis the average soil permeability for the entire basin, in inches per hour Slis the slope of the main channel, in feet per mile, as measured by dividing the difference in elevation at points in the channel at 10 and 85 percent of the main channel length by the intervening main channel length.

USGS StreamStats is a Map-based Web Application  StreamStats uses geographic information system (GIS) software and programming techniques to extract watershed parameters with minimal time and resources.  Extracted watershed characteristics (area, CN, …) are “Sent” to NFF and results are “Published” to the web browser

Arc Hydro tools implement specialized data structures and tools  Use Arc Hydro tools for terrain preprocessing. They build an interconnected set of spatial data that facilitate quick execution for analytical tools, a “analytical data cache”  Raster data:  DEM, flow direction, flow accumulation, drainage lines, sinks, …  Vector data:  Drainage lines, catchments, adjoint catchments, sinks, lakes, …

Watershed Delineation from a Point SS website uses Arc Hydro tools for watershed delineation, characterization, and analysis that leverage the preprocessed data structures.

Sample from Basin Characteristics Report ParameterValue Contributing drainage area, in square miles51.18 Contributing drainage area minus the area upstream of NRCS floodwater-retarding structures, in square miles Percent of contributing drainage area regulated by NRCS floodwater-retarding structures 0.0 Mean basin elevation, in feet1250 Elevation at outlet in feet1070 Mean basin slope in percent, computed from 10- meter DEM 4.50 Longest-flow-path slope in feet per mile11.5 Soil permeability from STATSGO, in inches per hour These attributes are also stored in shapefile of the delineation & can be downloaded

1) Select area 2) Delineate watershed 3) Get results

Development for new skin (SSv4) targeted for FY16