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<br />discharges by a ratio of the heads (HE/DEBHO). The routing was made <br />using a storage indication routing. ' <br /> <br />. <br /> <br />f. Run No. 10. - Exhibit 3 shows the outflow assumed for the <br />Modified Pu1.s r01Il;ing using an induced surcharge operation of the <br />flood control conduit. On Exhibit 3 discharge rating curves are <br />shown for the conduit only (curve 1), for the spillway only (curve <br />2), for the spillway plus conduit (curve 3), and for the assumed <br />discharge far the Modified Pu1.s routing. Note that above the top <br />of the induced surcharge pool (ELTSUR) the assumed discharge is <br />equal to the total discharge of spillway and conduit (ICASE = 1). <br />Between the elevation of the bottan of induced surcharge (EISURO) <br />and ''ELTSUR'' the conduit is opened so its discharge is increased <br />uniformly until fully open. The assumed discharge between the spill- <br />way crest elevation and "EISURO" is controlled by "ICASE" 15 which <br />uses a minimum discharge of "QMIN2" or 900 c.f.s., but not less than <br />the spillway discharge onl,y. Using this criteria the assumed dis- <br />charge for elevation 464 was 900 c. f. s ., for elevation 466 the spill- <br />way discharge alone gives 1900 c.f.s. During the routing the <br />cc:mputer will use a linear interpolation between the elevation- <br />discharge points. If this straight line interpolation is not sat- <br />isfactory between elevations 464 and 466 another elevation can be <br />read in at 464.4 to correctl,y define the criteria. The actual <br />Modified PIlls routing is self-explanatory. Notice the design head <br />assumed is 11.0 feet while the computed head was 22.52 feet. This <br />indicates a new rating for a higher head (close to 23 feet) should <br />be made as well as a new routing. <br /> <br />10. PROPOOED FUTURE DEVELOPMENT <br /> <br />It is anticipated that additions to this program will be made <br />fran time to time. It is requested that any user of this program <br />who finds an inadequacy or desirable addition or modification notify <br />the Hydrologic Engineering Center. <br /> <br />11. RElATED PROORAlofl <br /> <br />Separ,ate camputer programs are available for computing the spill- <br />way rating onl,y (22-J2-12ll) and for ma.king the flood routing (23-J2- <br />1210). The primary advantage in their use instead of this program is <br />that sanetimes different engineers perform the ratings and the rout- <br />ings. The input data for these programs is also easier to prepare. <br /> <br />17 <br />