2 A ontrol 80 13 # 3 W N S Y option E ((C F4 4 D X X5 NAME: % R command PS F C T 6 G V 7 Y H B C J N K M L A. command egois oidge 4. What is the approximate width of the floodplain, in km? 134 ? 21 ? ASSIGNMENT PART ONE Rio Grande River north of Anthony, NM The Rio Grande topographic map (first map in the next few pages of your manual) shows a contour map of the La Mesa, New Mexico area based on USGS elevation data. This section of the map shows the southernmost part of the Rio Grande River in New Mexico, south of Las Cruces. 1. What is the contour interval (in feet) of this map? option 2. Draw a topographic profile from A to A' using the map and graph supplied on page 137. transM 3. Using arrows, label the modern floodplain of the river on your topographic profile. smar map was 5. Sediment that forms the topographic surface on the western end of the deposited about 800,000 years ago (800 ka) by the ancestral Rio Grande. a) How has the vertical position of the floodplain changed relatively in this location ov