LA-PPT: Landsburg Historical Precipitation Records0.23 MEG compressed
1.23 MEG uncompressed Requires: ANNIE.EXE or HSPFxx.EXE. This file contains the file LA98PPT.WDM which includes the historical rainfall record for the Landsburg raingauge. This data is stored in WDM format which is supported by HSPF 9.0 or later, and by the ANNIE software. The following data sets are included in LA98PPT.WDM: DSN 3: Puyallup pan evaporation. Historical daily accumulation measured in inches. Gaps are filled in with Jensen-Haise estimates based on maximum and minimum temperatures as well as inclination, latitude, altitude, etc. These gaps commonly occur during the winter months when pan evaporation is not measured. Beyond water year 1993 the daily totals are an average taken from the period of record (with gaps filled in). Hence, water year 1994 through present are identical patterns. Pan evaporation must be converted to potential evaporation when used in HSPF modelling. This is commonly done by scaling the pan evaporation by a multiplication factor of 0.7-0.8, within the EXTERNAL SOURCES block of the HSPF input file. DSN 4: Historical hourly Landsburg precipitation in inches. Period of Record water years 1949 through 1998. Water years 1949 through 1954 regressed from Sea-Tac record. DSN 9: Synthetic 15-min Landsburg precipitation in inches. Same Period of Record as historical. This precipitation record was used to generate the 15-minute KCRTS runoff files. WARNING! This is not historical data. Synthetic storm events are not representative of actual storm distributions. This data should be used only for composite statistics, not specific event assessments. Technical support for registered owners of KCRTS/HYD-BW can be obtained by calling 206 296-1900. E-mail can be sent to steve.foley@metrokc.gov. Installation: Decompress the downloaded file by typing the name of the self-extracting file ("1" in filename) and press Enter. This will create 3 files, the LA98PPT.WDM, readme.bat and readme.1st. The default directory is C:\KC_SWDM\HSPF_WDM. The LA98PPT.WDM is ready to be used. For questions about the Stormwater Web Site, please contact Dale Nelson,Engineer II, King County Stormwater Services Section.
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