Laserfiche WebLink
<br />0017J4 <br /> <br />36.2--9 <br /> <br />WATER INFORMATION MANAGEMENT SYSTEM HANDBOOK <br /> <br />(9) Multiply the TVC in column 8 by QB (in CFS) for the AcFt volume <br />of QL2' Record in column 9. <br /> <br />(10) Total the TVC and acre/feet volumes (columns 8 and 9) for QLl <br />and QL2 for an estimate of total baseflow volume (QL)' <br /> <br />f. Summary Maintenance Flow (calculation of total volume): <br /> <br />The maintenance flow requirements are summarized by the three primary <br />components at the bottom of the worksheet (ex. 3). The following are <br />recorded: <br /> <br />( <br /> <br />1. Total volume of bankfull flow (QB) in AcFt. <br /> <br />2. Total volume of rise-recession flow (1/2 QR) in AcFt. <br /> <br />3. Total volume of baseflow (Ql) in AcFt. <br /> <br />Sum these three component volumes for a total maintenance flow (QI) <br />volume in AcFt. Component volumes and total maintenance flow volume are <br />represented as percentages of total water yield. <br /> <br />With the completion of the calculation of the magnitude of channel <br />maintenance flows for the gaged station and the detennination of the Day 1 <br />Index Point on the hydrograph, the rising, bankfull, and recession flow <br />components are scheduled. The flow rates for the individual rising or <br />step-up segments and their related durations are plotted as the beginning <br />portion of the channel maintenance flow hydrograph (ex. 4). Following the <br />last rising component step, the bankfull flow rate with its related <br />duration is plotted. A series of one-day recession flow segments are then <br />plotted. The recession flow segments have 1 day durations at flow rates <br />as commensurate with the rising flow rates as practicable. <br /> <br />The remaining portion of the channel maintenance flow hydrograph consists <br />of the baseflow flow rates and durations. The baseflow.levels are <br />plotted, with user discretion, on each side of the rise-bankfull-recession <br />components with levels representing both QLl and Ql2 (ex. 4). <br /> <br />STEP 3. Point of Quantification Maintenance Flow Estimation Worksheet. <br /> <br />a. In sec. 36.1, appendix A, bankfull disharge for a point of <br />quantification was estimated using five different methods. For this <br />worksheet example, a bankfull discharge of 185.8 cfs as calculated from <br />Method A will be used to estimate the maintenance flow requirements for a <br />point of quantifi,ation called Gold Creek. <br /> <br />ID No. 1 <br />9/10/85 <br />