Download the Initial Project Fileshere. Unzip in the C:\CWMS_Class directory. CWMS 3.4 was used to create the workshop files and instructions.
Background
The Salt River basin drains 2,914 square miles of northeastern Missouri. There are 2 dams located on the Salt River. Clarence Cannon Dam, which forms the 18,600 acre Mark Twain Lake, is located approximately 63 miles upstream from the confluence of the Salt River and the Mississippi River. The second dam is the Reregulation Dam, located 9 miles downstream of Clarence Cannon Dam. The watershed is generally fast responding, in that local runoff normally peaks within 24 hours. The average slope of the Salt River from the Reregulation Dam to its mouth is approximately 1.3 feet per mile. Flood damages on the Salt River downstream of the Reregulation Dam are almost entirely agricultural in nature. The Salt River below river mile 16.0 is greatly affected by Mississippi River backwater and uncontrolled flows from Spencer and Peno Creeks. Private levees found in the lower 16 miles of the Salt River mainly protect against backwater flooding from high Mississippi River stages.
Overview
You and your fellow water managers have been closely watching a flood event developing on the Mississippi River and are concerned with backwater flooding in the lower Salt River basin. As water levels rise, reports from the field indicate potential problems with Pike Grain Levee #4. Engineers on site have witnessed seepage within the protected area of the levee, mainly in the form of sand boils. They are concerned that if the river continues to rise, the levee may breach. Your task is to prepare a briefing that shows the inundation within the leveed area with and without a levee breach.
