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RGDSS Memorandum <br />Final <br />TO: Ray Bennett <br />FROM: Jim Brannon, Ed <br />SUBJECT: RGDSS Surface <br />DATE: March 8, 2000 <br />CC: Randy Seaholm <br />Introduction <br />Armbruster, Hydrosphere <br />Water, Task 6.6 -Prepare River System Files <br />This memorandum represents delivery associated with Task 6.6, Prepare River System Files / <br />Memoranda. The objective ofthis task is as follows: <br />Develop and operate a command file for the DMI tstool that generates the historic <br />monthly Streamflow file, including data filling techniques. <br />The Streamflow file (rg.rih) for the Phase la historic monthly Surface Water Model contains time <br />series of prescribed monthly stream flows for important locations in the Rio Grande Basin. These <br />time series span the modeled period, January 1950 to December 1997. Most of these data consist <br />of historical records of observed monthly flows that are extracted from HydroBase using the <br />tstool Data Management Interface (DMI). Data filling techniques from simple data average fills <br />to data analysis tools such as linear or log-linear regression are available in tstool where the <br />period of record of the gage is insufficient or there are missing data. Some data in the rg. rih file <br />are developed using information and/or analyses external to tstool, and therefore are provided via <br />text data files (*.stm files). <br />The data in the rg.rih file represent stream flows that reflect the natural hydrology as well as <br />human activities in the basin. StateMod removes these effects from the stream flows when <br />"baseflows" are generated. For Phase la ofthe model (Task 6) only the effects (diversions, <br />return flows, reservoir operations and evaporation) from key structures are removed. The effects <br />of non-key structures are "left in the gage" (ie. in the baseflows) until Task 7 when the remaining <br />diversions are added to the model via "aggregated" structures. Historical records of diversions <br />and reservoir contents (also contained in HydroBase) are used in conjunction with the stream <br />flow data in the rg. rih file to develop the baseflows. <br />Sources of Historical Streamflow Data <br />The primary source of data for the development of surface water hydrology for the Rio Grande <br />Surface Water Model is the historical record of observed stream flows for the period of 1950 to <br />1997 in the Hydrobase database.. On rare occasion these records were supplemented by written <br />records and/or recollections of observed surface flows by residents (water users) and water <br />managers (Water Commissioners, employees of ditch and irrigation companies, etc.). The <br />following sections describe the Streamflow records in Hydrobase that were used in developing the <br />StateMod river system (hydrology) input file, RG.RIH. <br />C:Acdss\Task6-6.doc Prepare River System Files March 8, 2000 -Page 1 of 11 <br />