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<br /> <br />POND 010 FLOOD ROUTING OF 25 YEAR 24 HOUR STORM THROUGH EMERGENCY SPILLWAY <br />SCS TR-20 RUN 07/28/1999 <br />TR20 XEO 07-28-99 08:39 JOB 1 PASS 1 <br />REV PC 09/83(.2) PAGE 1 <br />FILE N0. 3 <br />COMPUTER PROGRAM FOR PRO SECT FORMULATION - HYDROLOGY US EA NOTES <br />THE USERS MANUAL FOR THIS PROGRAM IS THE MAY 1983 DRAFT OF TR-20. CHANGES FROM THE 2/19/79 VERSION INCLUDE: <br />REACH ROUTING - THE MODIFIED ATT-KIN ROUTING PROCE DUA£ REPLACES THE CONVEX METHOD. INPUT DATA PREPARED FOR <br />PREVIOUS PROGRAM VERSIONS USING CONVEX ROUTING COEFFICIENTS WILL NOT RUN ON THIS VERSION. <br />THE PREFERRED TYPE OF DATA ENTRY IS CROSS SECTION DATA REPRESENTATIVE OF A REACH. IT IS RECOMMENDED THAT <br />THE OPTIONAL CROSS SECTION DISCHARGE-AREA PLOTS BE OBTAINED WHENEVER NEW CROSS SECTION DATA IS ENTERED. <br />THE PLOTS SHOULD BE CHECKED FOR REASONABLENESS AND ADEQUACY OF INPUT DATA FOR THE COMPUTATION OF "M" <br />VALUES USED IN THE ROUTING PROCEDURE. <br />GUIDELINES FOR DETERMINING OR ANALYZING REACH LENGTHS AND COEFFICIENTS (X, M) ARE AVAILABLE IN THE USERS <br />MANUAL. SUMMARY TABLE 2 DISPLAYS REACH ROUTING RESULTS AND ROUTING PARAMETERS FOR COMPARISON AND CHECKING. <br />HYDROGRAPH GENERATION - THE PROCEDURE TO CALCULATE THE INTERNAL TIME INCREMENT AND PEAK TIME OF THE UNIT <br />HYDROGAAPH HAVE BEEN IMPROVED. PEAK DISCHARGES AND TIMES MAY DIFFER FROM THE PREVIOUS VERSION. OUTPUT <br />HYDROGRAPHS ARE STILL INTERPOLATED, PRINTED, AND ROUTED AT THE USER SELECTED MAIN TIME INCREMENT. <br />INTERMEDIATE PEAKS - METHOD ADDED TO PROVIDE DISCHARGES AT INTERMEDIATE POINTS WITHIN REACHES WITHOUT ROUTING. <br />OTHER - THIS VERSION CONTAINS SOME ADDITIONS TO THE INPUT AND NUMEROUS MODIFICATIONS TO THE OUTPUT. USER <br />OPTIONS HAVE BEEN MODIFIED AND AUGMENTED ON THE SOB RECORD, RAINTABLES ADDED, ERROR AND WARNING MESSAGES <br />EXPANDED, AND THE SUMMARY TABLES COMPLETELY REVISED. THE HOLDOUT OPTION IS NOT OPERATIONAL AT THIS TIME. <br />PROGRAM QUESTIONS OR PROHLEMS SHOULD BE DIRECTED TO HYDRAULIC EN GINE£RS AT THE SCS NATIONAL TECHNICAL CENTERS: <br />CHESTER, PA (NORTHEAST) -- 215-999-3933, FORT WORTH, T% (SOUTH) -- 339-5292 (FTS) <br />LINCOLN, NB (MIDWEST) -- 591-5316 (FTS), PORTLAND, OR (WEST) -- 423-9099 (FTS) <br />PROGRAM CHANGES SINCE MAY 1982: <br />12/17/82 - CORRECT PEAK RATE FACTOR FOR USER ENTERED DIMHYD <br />CORRECT REACH ROUTING PEAK TRAVEL TIME PRINTED WITH FULLPRINT OPTION <br />5/02/63 - CORRECT COMPUTATIONS FOR --- <br />1. DIVISION OF BASEFLOW IN DIVERT OPERATION <br />2. HYDROGRAPH VOLUME SPLIT BETWEEN BASE FLOW AND ABOVE BASEFLOW <br />3. CROSS SECTION DATA PLOTTING POSITION <br />4. INTERMEDIATE PEAK WHEN "FROM" AREA IS LARGER THAN "TH RU" AREA <br />Attachment 2.053(3)6-4 <br />