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<br />001597 <br /> <br />35.11 <br /> <br />WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK <br /> <br />35 - MONITORING. Before montioring begins, develop a montioring plan and <br />nave it approved by the appropriate line officer. <br /> <br />35.1 - Contents of Monitoring Plans. Answer the following questions when <br />aesrgning monltorlng plans: . <br /> <br />1. Are the dimensions of the active channel stable with flow over time? <br /> <br />2. Is sediment, both in size and volume, being distributed and <br />transported in such a way as to prevent either aggradation or degradation? <br /> <br />3. Are the bed and banks stable? <br /> <br />4. Is there any change in channel capacity over time due to vegetative <br />encroachment and sediment deposition? <br /> <br />35.11 - Data Collection. Address the following data collection needs in <br />the monitoring plans: <br /> <br />1. A permanent record of stream cross-section dimensions and <br />elevation, referenced to a bench mark elevation. A cross-section survey <br />should be conducted annually. <br /> <br />2. Hydraulic geometry data to observe any shifts in these <br />relationships. <br /> <br />3. Suspended sediment, bedload sediment including size distribution, <br />and stream discharge data over a wide range of flows including: <br /> <br />a. Rising limb of low elevation snowmelt runoff. <br />b. Recession limb of low elevation snowmelt runoff. <br />c. Rising limb of high elevation snowmelt runoff. <br />d. Recession limb of high elevation snowmelt runoff. <br />e. Bankfull. <br />f. Baseflow. <br />g. Stormflow runoff. <br /> <br />4. Channel materials size distribution (using the pebble count or <br />similar method) on a permanent transect and proportionately sampling <br />riffles and pools. <br /> <br />5. A monumented photo-point to document channel changes over time. <br /> <br />6. A record of flow diversions or importation as well as natural flows. <br /> <br />ID No. 3 <br />8/28/87 <br />