Laserfiche WebLink
and shallow bed material at all discharges. Maps were created in the field during July and <br />September 1996. Distinct geomorphic features were identified on the ground and matched <br />to 1: 5000 scale aerial photographs made in 1993 at approximately 2000 ft3/s. This was <br />accomplished by overlaying mylar onto one copy of a stereo pair of air photos. While <br />viewing the photographs with a stereo scope, distinct surfaces were traced onto the photo <br />and identified. Deposits were delineated by their depositional environment, material type <br />and size. Specific geomorphic features mapped include: talus, debris fans, gravel bars, <br />eddy deposits, terrace-like channel-margin deposits, and densely vegetated alluvium, <br />(Appendix). <br />Hydrologic and shoreline habitat maps were also created for each reach. Individual <br />hydrologic maps were repeated for the Surprise Canyon, Joe Hutch, and Coal Creek study <br />reaches on five separate occasions in 1995 and 1996. Maps for the Cedar Ridge reach <br />were repeated on three occasions during 1996. Discharges during hydrologic mapping <br />ranged from 2100 to 27000 ft3/s. The purpose of these maps is to establish relationships <br />between discharge, areas of low velocity, and the distribution of shoreline habitats. <br />Hydrologic maps were created by mapping onto 1: 5000 scale aerial photographs as <br />described above. Features included in these maps include: downstream flow, eddy fences, <br />recirculating flow, low-velocity zones dominated by wave swash, and stagnant water. In <br />addition, the contact of the water's edge and the bank was delineated. Shorelines were <br />classified into bank-material types including bedrock, talus, debris-flow deposits, gravel, <br />sand, silts and muds, and dense vegetation. Water elevations along shorelines were <br />determined by comparing the distance from water's edge to features identifiable on the air <br />photos. Areas of recirculating, swash and stagnant zones were determined either by <br />obtaining a vantage high above the water from which eddy fences were easily identified, or <br />by floating a one-person inflatable kayak through the mapping area and physically <br />experiencing and recording the flow environment and its boundaries.