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<br />PEAKFQ <br /> <br />example: ascii! input <br /> <br />PEAKFQ <br /> <br />Start. Modify <br /> <br />If Yes was specified under the Modify optipn on the Opening Screen, a Modify screen <br />will be presented for each station from theiASCII input file, as it is processed. This is <br />in contrast to the WDM Input option, where all computation modifications are made <br />fOT all data sets being processed before any processing starts. The default values on the <br />Modify screen are determined by the contents of the input file, including any "I" <br />records that may be present. All of the computation options can be changed by the <br />user. <br /> <br />By default, the begin and end year fields cbntain the water years of the first and last, <br />Tespectivley, peaks in the input file for the:station. If an "I" record is present, positive <br />values in the begin and (or) end year field$ will be provided as the defaults. This will <br />determine the period of record to be used in the calculations. <br /> <br />By default, the length of the historic period is zero; no historic adjustment is applied <br />during computation, the historic peaks are ignored, and any high outliers are treated as <br />normal systematic peaks. If an "I" record is present, a positive value in the length of <br />historic period field will be provided as th~ default. If positive, the historic period con- <br />tains the systematic recoTd as a subset. <br /> <br />The skew computation option is, by defauit, weighted between station and generalized <br />skews (WTD, Bulletin 17B weighted skeW.) If an "I" record is present with a station <br />option code of S orG, the default skew option code will be be STAtion or GENeral- <br />ized. <br /> <br />By default, the Bulletin 17B computed low-outlier criterion will be applied dUTing <br />computation, This is indicated by a 0.0 in!the low-outlier threshold field. If an "I" <br />record is present, a positive value in the l~w-outlier discharge criterion field will be <br />provided as the default. Historic peaks wit;h discharges below the low-outlier threshold <br />will not be used in the calculations. . <br /> <br />The gage base discharge represents the lower limit of measureable flood peak at a sta- <br />tion; this is 0.0 by default. If an "I" record is present, a positive value in the gage base <br />discharge field will be provided as the deflmlt. A negative or zero value will be ignored <br />by the program. If positive, this gage base discharge will supersede the gage base <br />inferred from any "less than" qualificatiob code (4) in the peak record. Note that this <br />gage base discharge is not the same as th~ partial-duration base discharge that may be <br />in the station header "Y" record. . <br /> <br />The Latitude and Longitude fields contain, by default, the values from the station <br />header "H" record. They are used to compute the generalized skew if it is not enteTed. <br /> <br />By default, the Hi-outlier threshold field is 0.0. If an "I" record is present, a positive <br />value in the historic-high-outlier discharge threshold field will be provided as the <br />default. If a positive value is specified in :this field, it will override the Bulletin-17B <br />computed high-outlier threshold, with all: historic peaks that are less than this ignored <br />in the computations. If this field is blank .or negative, the threshold will be set to the <br />value of the lowest historic peak. <br /> <br />PEAKFQ <br /> <br />65 <br /> <br />DRAFT - 1/30/98 <br />