7245 - Laserfiche WebLink

Home Browse Search

8. 9. 10. 3. Install a permanent staff gage that will remain in place over the course of the study. In addition, install a temporary staff gage that can be read before and after each transect measurement. 4. Complete a water surface elevation summary for both banks and each cross section for at least three flow levels. Survey the streambed and bank profile at each transect indicating the extent of vegetation and substrate types. 5. 6. Measure the mean column velocity distribution and determine the discharge for each transect. 7. Recheck and record the temporary staff gauge upon completion of velocity measurements. Recheck and record the reading of the permanent staff gage after the last transect is measured. Measure distances between transects at water's edge along both banks. Prepare a reference map of the study site, noting unique situations. Review field notes for completeness and inventory equipment. Substrate I~ addition to the hydraulic measurements substrate type at each cell is recorded. A two digit code and standard classification criteria are used to visually evaluate substrate conditions at each transect (Table 3.). Generally, each transect is waded during low flow conditions to record both the predominant and surrounding particle size. If the transect is too deep to wade, the substrate types are estimated by prodding a paddle into the streambed from the boat. The two digit substrate index at any given vertical represents the general characteristics of the streambed materials within an imaginary cell extending half the distance to each adjacent vertical. It is assumed that the dominant and subdominant substrate types within the cells remain constant throughout the flow regime. Table 3. Substrate Coding System used to describe substrate types. Code 1 2 3 4 5 6 7 8 Substrate Descriotion Clay Silt Sand Gravel Rubble Boulder Bedrock Other 7