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08253500 <br />This stream flow location in the StateMod network was created to reflect historical observed <br />stream flows at USGS gage 08253500, SANTISTEVAN CREEK NEAR COSTILLA, NM. <br />The period of record for this gage is 1937-1997, however, winter month flows are missing <br />from the records. Monthly flow estimates for the missing time periods were developed in <br />tstool using monthly logarithmic regression against the flows at USGS gage 08255500, <br />COSTILLA C NR COSTILLA, NM. Statistical measures of the regression results can be <br />viewed in Table 1 below and the tstool log file (ATTACHMENT 1). The historical flows <br />for gage 08255500 required slight modifications to fill the months of October-December of <br />1997 and are found in the time-series file, 08255500.STM. The tstool DMI, therefore, reads <br />the historical flows for gage 08253500 directly from HydroBase and the flows for gage <br />08255500 from the time-series file 08255500.STM. <br />08254000 <br />This stream flow location in the StateMod network was created to reflect historical observed <br />stream flows at USGS gage 08254000, COSTILLA CREEK BELOW COSTILLA DAM, <br />NM The period of record for this gage is 1937-1997, however winter month flows are <br />missing from the records.. Winter month flows below the reservoir were estimated to be <br />very small, and therefore atime-series file containing the observed 08254000 gage data <br />combined with zero winter month flows was created. The tstool DMI reads the historical <br />flows for this gage from the time-series file 08254000.STM. <br />08255500 <br />This stream flow location in the StateMod network was created to reflect historical observed <br />stream flows at USGS gage 08255500, COSTILLA C NR COSTILLA, NM The period of <br />record for this gage is 1936-1997, however flows are missing from HydroBase for the <br />months of October, November, and December of 1997. These flows were estimated using <br />the historical monthly averages using tstool and exported to atime-series file. The tstool <br />DMI reads the historical flows for this gage from the file 08255500.STM. <br />Water District 25 <br />08224500 <br />This stream flow location in the StateMod network was created to reflect historical observed <br />stream flows at USGS gage 08224500, KERBER C AT ASHLEY RANCH, NR VILLA <br />GROVE, CO. The period of record for this gage is 1923-1998. Monthly flow estimates for <br />the missing time periods were developed in tstool using monthly logarithmic regression <br />against the flows at the USGS gage 08227000, SAGUACHE CREEK NEAR SAGUACHE, <br />CO. Statistical measures of the regression results can be viewed in Table 1 below and the <br />tstool log file (ATTACHMENT 1). The tstool DMI reads the historical flows for gage <br />08224500 and 08227000 directly from HydroBase. <br />08227500 <br />This stream flow location in the StateMod network was created to reflect historical observed <br />stream flows at USGS gage 08227500, NORTH CRESTONE CREEK NEAR CRESTONE, <br />CO. The period of record for this gage is 1936-1998. No adjustments or data filling was <br />necessary for this location, therefore, the tstool DMI reads the historical flows for this gage <br />directly from HydroBase.. <br />C:Acdss\Task6-6.doc Prepare River System Files March 8, 2000 -Page 8 of 11 <br />