Extracted text: culation Research 3.1 vation of 10 feet above the base, and 3:1 (horizontal:vertical) slopes on both sides. If the levee is to be raised to an ele- vation of 15 feet and must meet new standards requiring An existing levee has a top width of 10 feet, a top ele- Note: For Hom 3.16, and 3.18, www.wiley.com, 3.12 Read the m a Report Card for An mation in this ch 12-foot top width, how much additional land space (in ft) will be needed for the base of the levee per mile of levee length? Assume side slopes remain 3:1. Show all work, and support your answer with appropriate drawings and schematics. words) letter to y your concerns ov report card chapt