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Luther College

Founded in 1861 by Norwegian immigrants, Luther College is a four-year, residential liberal arts institution of the Evangelical Lutheran Church in America, located in Decorah, Iowa, USA. The college offers more than 60 majors and preprofessional programs leading to the bachelor of arts degree, with the greatest number of graduates coming from biology, education, and music.

More information: http://en.wikipedia.org/wiki/Luther_College_(Iowa)

ESTIMATING THE 100-YEAR FLOOD FORDECORAH USING THE RAINFALL EVENTS OF THE RIVER'S CATCHMENT By Kai Tsuruta Faculty Advisor: Richard Bernatz Abstract:This project estimated the flow in the Upper Iowa River and the severity of the “hundred-year flood.” Thirteen gauges were placed throughout areas whose rainfall ran into the river and were north of Decorah to measure the amount of rain from an event and the time it occurred. Using gauge data an interpolation method estimated rainfall for the whole catchment. Next a computer program, GLUE, randomly assigned values within a range of likely values to variables associated with runoff and predicted a flow. Over several trials this gave a distribution of values that the flow was likely within. To calculate the “hundred year flood” the events were fitted to a suitable distribution and the largest event with a 1% chance of occurring annually was found. The largest event of July was replaced with the calculated event and GLUE was run, giving the range of likely flow values for the flood. The Upper Iowa River watershed is approximately 1395 square kilometers (540 square miles) in size. The watershed upstream from Decorah is partitioned into 31 subwatersheds defined, mostly, by tributaries to the Upper Iowa River. Basic TOPModel Storage and Flow Variables: S(t) = Average Saturation Deficit (Length)   = flow from the unsaturated zone to the saturated zone (Length/Time) where i is the hydrologic similar...

The hydrograph for Ten Mile Creek is shown to the right. Hydrographs are calculated for each of the 30 Subcatchments. Radar data is used to create rainfall time series for each subcatchment 1) The Digital Elevation Model (DEM) file of Northeast Iowa is a data set of elevations on a grid of 30 meter by 30 meters squares, or elements 2) Extraction – The rectangular area containing a given subcatchment is grabbed from the master DEM In this case we are extracting Ten Mile Creek 3) Fix – For each subcatchment the data must be altered to remove sinkholes 4) Trace – The extracted rectangular area contains elements not in the subcatchment. These are removed using our trace algorithm which identifies all elements whose rainfall will drain to the given inlet to the Upper Iowa river A total of 30 subcatchments (18 stream subcatchments and 12 river basin catchments) were delineated for the Upper Iowa catchment upstream from Decorah Upper Iowa River Catchment Decorah, Iowa Elements of a given subcatchment are grouped according to their potential for reaching saturation. Each element is assigned an index based on hydrologic and physical characteristics. Like elements form a Hydrologic Similarity Group (HGS) Elements with lower indices are less likely to be saturated. The range of HSG indices range from red (high and dry) to blue (low and wet) on the ROYGBIV scale The HSG index for a given element is based on : The Uphill region draining through the element (Water exits an ...

Stellar PHOTOMETRY ON TIMESCALES OF TENTHS OF SECONDS TO YEARS Jeff Wilkerson Luther College MSU Mankato October 11, 2007
Elaine Lore of Decorah High School Partnering with Olga Rinco Project: Used chemistry to determine contents of food. The students looked up the sugar content of beverages they consume regularly. The experiment was used to also introduce students to using Excel, making a standard curve and reading data. They measured the sugar content in soda, milk, koolaid and sports drinks using the very basic Hydrometers that the students made themselves.

Elaine Lore of Decorah High School Partnering with Olga Rinco Project: Used chemistry to determine contents of food. The students looked up the sugar content of beverages they consume regularly. The experiment was used to also introduce students to using Excel, making a standard curve and reading data. They measured the sugar content in soda, milk, koolaid and sports drinks using the very basic Hydrometers that the students made themselves.

COMPARISON OF CHANNEL ROUTING TECHNIQUES FOR STEEP WATERSHEDS Muskingum-Cunge Result Observed Calculated Channel Conceptual Model Assumptions One-dimensional flow Unsteady (varies with time) Incompressible Constant temperature and density Hydrostatic pressure No lateral discharge Governing Equations Continuity Equation 2. Momentum Equation where Control Volume for Hydrologic Methods observed calculated Kinematic Model Kinematic Result observed calculated x (stream location) t (time) Time Delay Result Ten Mile Creek Hydrograph Ten Mile Creek Beaver Creek - shifted Time Delay Sum Beaver Creek Hydrograph is “delayed” by the amount of time required to reach Decorah Time Delay Method Muskingum-Cunge Model By Robert Stone and Ann Cary Faculty Advisor: Richard Bernatz Hydrographs for 30 subcatchments of the Upper Iowa River basin calculated using TOPModel concepts are routed in the main channel by three different techniques. The Upper Iowa bed slope is particularly steep, with gradients as high as 7 feet per mile. Comparisons of calculated hydrographs for each methods versus the observed hydrograph are presented. x = channel position t = time A(x,t) = channel cross-sectional area h(x,t) = average cross-section height v(x,t) = average cross-section velocity Q(x,t) = A(x,t)*v(x,t) = volume flow rate Under the assumption of Conservation of Mass and a relationship between flow and storage
What is DNS?

What is DNS?

DNS = Domain Name System Used to map names (www.luther.edu) to IP addresses (192.203.196.18) and vice versa Domain Name Servers maintain lists of domain names/IP addresses and map the domain names in Internet requests to other servers on the Internet until a specified web site is found * From www.easynet.com/investorinfo/investorinfo_glossary.asp
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