United States Office of Water Environmental Protection 4305 December 2005 vvEPA BASINS Technical Note 7 Matching STORET Parameters with HSPF Output ------- BASINS Technical Note 7 Matching STORET Parameters with HSPF Output INTRODUCTION The Hydrological Simulation Program Fortran (HSPF) watershed model simulates the complete hydrology of a watershed including in-stream hydraulics, reach network routing, and watershed and in-stream fate and transport processes for a wide variety of pollutants and pollutant types. Using HSPF, a modeler can evaluate alternative pollutant control scenarios given that an accurate simulation of the baseline conditions of the watershed can be achieved. To reproduce the current condition of the watershed, however, the modeler must first calibrate modeled flow and pollutant concentrations against available gage flow and pollutant monitoring data. Seen as an important source of information regarding the health status of the nations surface waters, the STOrage and RETrieval system serves as a repository of waterway parametric data, including information on ambient, intensive survey, effluent, and biological water quality. STORET is maintained by EPA and contributed to by a number of organizations including federal, state, interstate agencies, universities, contractors, individuals and water laboratories. Each provider of data is responsible for the data it submits to STORET, and data updates are performed regularly. The legacy STORET system, frozen as of the end of 1998, is currently archived under the name Legacy Data Center (LDC). Since the start of 1999, all new data is entered into the modernized STORET, also known simply as STORET. A subset of the LDC data, included in BASINS as Water Quality Observation Data, was selected from the LDC based on their utility in water quality trend analysis and model calibration. BASINS users can export the water quality observation data set, or download other data sets from the STORET web site, for purposes of calibrating the hydrology and water quality simulations in HSPF. The purpose of this technical note is to assist BASINS users in correlating HSPF output time series with parameters from the legacy and modernized STORET systems. While the legacy STORET (LDC) used parameter code descriptions based on unique combinations of parameter names, analytical methods, and units, the modernized version is a relational database with a separate table for the parameter or characteristics. In addition to the traditional date, location, and constituent name, the modernized STORET includes fields for sampling purpose, people and organizations involved, as well as for methods used in sampling, storage, transport, preparation, and analysis. Thus with analytical method and units maintained separate from the parameter name, the new STORET's characteristics table is greatly simplified in relation to the LDC parameter list, and is largely without duplication. Table 1 and Table 2 show how unique legacy STORET parameters and unique modernized STORET characteristics, respectively, match up with individual and aggregate HSPF output time series. More than one STORET parameter or characteristic may be comparable to a single HSPF output time series. Conversely, in some cases, a single STORET parameter or characteristic corresponds to the aggregate of two or more HSPF outputs. 1 ------- Note: While some LDC parameter code descriptors were officially associated with particular analytical techniques, it's certain that not all STORET contributors were aware of the official code/technique associations. That is, the data within STORET cannot be said to be strictly organized by analytical technique. In addition, inter-comparison of data for LDC parameters with similar names is likely valid in some cases but should be done only with substantial professional judgement 2 ------- Table 1 — STORET Parameters versus HSPF Output [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et al, 1996) for parameter name and variable definitions ] EPA STORET PARAMETER HSPF OUTPUT* PARM CODE PARM NAME UNITS CONSTITUENT SECTION NAME UNITS3 Remark ENGLISH METRIC 00010 TEMPERATURE, WATER deg C Water Temperature HTRCH TW DegC 00011 TEMPERATURE, WATER deg F Water Temperature HTRCH TW DegF 00049 SURFACE AREA sq. mi Surface Area HYDR SAREA ac ha 1 00051 SURFACE AREA sq. ft Surface Area HYDR SAREA ac ha 1 00053 SURFACE AREA acres Surface Area HYDR SAREA ac ha 00054 RESERVOIR STORAGE ac-ft Volume in RCHRES HYDR VOL ac-ft Mm3 1 00055 STREAM VELOCITY ft/s Average velocity (discharge/ average cross-section) HYDR AVVEL ft/s m/s 00056 FLOW RATE GPD Discharge HYDR RO, O cfs cms 1,2 00058 FLOW RATE GPM Discharge HYDR RO, O cfs cms 1,2 00059 FLOW, STREAM, INSTANTANEOUS GPM Discharge HYDR RO, O cfs cms 1,2 00060 FLOW, STREAM, MEAN DAILY cfs Discharge HYDR RO, O cfs cms 2 00061 FLOW, STREAM, INSTANTANEOUS cfs Discharge HYDR RO, O cfs cms 2 00062 ELEVATION, RESERVOIR SURFACE ft Stage (depth + stage correction) HYDR STAGE ft m 3 3 ------- Table 1 ~ STORET Parameters versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et al, 1996) for parameter name and variable definitions ] EPA STORET PARAMETER HSPF OUTPUT* PARM CODE PARM NAME UNITS CONSTITUENT SECTION NAME UNITS3 Remark ENGLISH METRIC 00065 STAGE, STREAM ft Stage (depth + stage correction) HYDR STAGE ft 3 00072 STAGE, STREAM m Stage (depth + stage correction) HYDR STAGE m 3 00299 OXYGEN .DISSOLVED, ANALYSIS BY PROBE mg/L Dissolved Oxygen OXRX DOX mg/L mg/L 00300 OXYGEN, DISSOLVED mg/L Dissolved Oxygen OXRX DOX mg/L mg/L 00310 BOD 5 DAY, 20 DEG C mg/L Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L 4 00314 BOD, NITROGEN INHIB., TOTAL, 5 DAY, 20 DEG mg/L Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L 4 00318 BOD, 5 DAY, 20 deg C kg/1000 gal Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L 1,4 00320 BOD, ULTIMATE 1st STAGE, 20 DEG C mg/L Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L 00400 PH SU PH PHCARB PHST(3) SU SU 00403 PH LAB SU PH PHCARB PHST(3) SU SU 00406 PH FIELD SU PH PHCARB PHST(3) SU SU 00600 NITROGEN, TOTAL mg/L as N Total Nitrogen NUTRX, PLANK DNUST (1-3) + RSNH4(4) + PKST3 (4) mg/L as N mg/L as N 5, 6 4 ------- Table 1 ~ STORET Parameters versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et al, 1996) for parameter name and variable definitions ] EPA STORET PARAMETER HSPF OUTPUT* PARM CODE PARM NAME UNITS CONSTITUENT SECTION NAME UNITS3 Remark ENGLISH METRIC 00604 NITROGEN, AMMONIA SUSPENDED IN WATER mg/L as N Total Ammonia (adsorbed/particulate) NUTRX RSNH4(4) mg/L as N mg/L as N 5 00605 NITROGEN, ORGANIC, TOTAL mg/L as N Total Organic Nitrogen PLANK PKST3 (4) mg/L as N mg/L as N 6 00608 NITROGEN, AMMONIA, DISSOLVED mg/L as N Total Ammonia (dissolved) (i.e. ionized plus unionized) NUTRX DNUST (2) mg/L as N mg/L as N 00610 NITROGEN, AMMONIA, TOTAL mg/L as N Total Ammonia (dissolved + adsorbed/particulate) NUTRX DNUST (2) + RSNH4(4) mg/L as N mg/L as N 5 00613 NITRITE NITROGEN, DISSOLVED mg/L as N Dissolved Nitrite NUTRX DNUST (3) mg/L as N mg/L as N 7 00615 NITRITE NITROGEN, TOTAL mg/L as N Dissolved Nitrite NUTRX DNUST (3) mg/L as N mg/L as N 7 00618 NITRATE NITROGEN, DISSOLVED mg/L as N Dissolved Nitrate NUTRX DNUST (1) mg/L as N mg/L as N 7 00620 NITRATE NITROGEN, TOTAL mg/L as N Dissolved Nitrate NUTRX DNUST (1) mg/L as N mg/L as N 7 00625 NITROGEN, KJELDAHL, TOTAL mg/L as N Kjeldahl Nitrogen Total NUTRX, PLANK DNUST (2) + RSNH4(4) + PKST3 (4) mg/L as N mg/L as N 5, 6 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. mg/L as N Nitrite plus Nitrate NUTRX DNUST (1) + DNUST(3) mg/L as N mg/L as N 7 5 ------- Table 1 ~ STORET Parameters versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et al, 1996) for parameter name and variable definitions ] EPA STORET PARAMETER HSPF OUTPUT* PARM CODE PARM NAME UNITS CONSTITUENT SECTION NAME UNITS3 Remark ENGLISH METRIC 00631 NITRITE PLUS NITRATE, DISS. 1 DET. mg/L as N Nitrite plus Nitrate NUTRX DNUST (1) + DNUST(3) mg/L as N mg/L as N 7 00635 NITROGEN, AMMONIA & ORG., TOTAL 1 DET mg/L as N Total Ammonia (dissolved _ adsorbed/particulate) + Total Organic Nitrogen NUTRX, PLANK DNUST(2) + RSNH4(4) + PKST3(4) mg/L as N mg/L as N 6 00640 NITROGEN, INORGANIC, TOTAL mg/L as N Total Inorganic Nitrogen NUTRX DNUST(1 - 3) + RSNH4(4) mg/L as N mg/L as N 5, 7 00651 PHOSPHOR US, DISSOLVED ORTHOPHOSPHATE WTM GF/F mg/L as P Dissolved Ortho-phosphate NUTRX DNUST(4) mg/L as P mg/L as P 00665 PHOSPHORUS, TOTAL mg/L as P Total Phosphorus NUTRX, PLANK DNUST (4) + RSP04(4) + PKST3 (5) mg/L as P mg/L as P 6, 8 00670 PHOSPHORUS, TOTAL ORGANIC mg/L as P Total Organic Phosphorous (TORP) NUTRX PKST3(5) mg/L as P mg/L as P 6 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHATE mg/L as P Ortho-Phosphate (dissolved) NUTRX DNUST (4) mg/L as P mg/L as P 00674 PHOSPHORUS, SUSPENDED ORTHOPHOSPHATE mg/L as P Particulate Ortho-phosphate NUTRX RSP04(4) mg/L as P mg/L as P 00680 CARBON, TOTAL ORGANIC mg/L as C Total Organic Carbon PLANK PKST3 (6) mg/L as C mg/L as C 6 6 ------- Table 1 ~ STORET Parameters versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et al, 1996) for parameter name and variable definitions ] EPA STORET PARAMETER HSPF OUTPUT* PARM CODE PARM NAME UNITS CONSTITUENT SECTION NAME UNITS3 Remark ENGLISH METRIC 00685 CARBON, TOTAL INORGANIC mg/L as C Total Inorganic Carbon (TIC) PHCARB PHST(1) mg/L as C mg/L as C 00940 CHLORIDE, TOTAL IN WATER mg/L Conservative Substance CONS CON(1) user defined user defined 9 31501 COLIFORM,TOT,MEM BRANE FILTER, IMMED. —ENDO MED.35C #/100 mL General Quality Constituent (Total Coliform) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 31613 FECAL COLIFORM, MEMBR FILTER,M-FC AGAR,44.5C,24HR #/100 mL General Quality Constituent (Fecal Coliform) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 31615 FECAL COLIFORM,MPN,EC MED.44.5C (TUBE 31614) #/100 mL General Quality Constituent (Fecal Coliform) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 31616 FECAL COLIFORM ,MEMBR FILTER,M- FC BROTH,44.5 C #/100 mL General Quality Constituent (Fecal Coliform) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 31625 FECAL COLIFORM, MF.M-FC, 0.7 UM #/100 mL General Quality Constituent (Fecal Coliform) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 31673 FECAL STREPTOCOCCI, MBR FILT.KF AGAR,35C,48HR #/100 mL General Quality Constituent (Fecal Streptococci) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 32209 CHLOROPHYLL A FLUOROMETRIC CORRECTED ug/L Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L 7 ------- Table 1 ~ STORET Parameters versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et al, 1996) for parameter name and variable definitions ] EPA STORET PARAMETER HSPF OUTPUT* PARM CODE PARM NAME UNITS CONSTITUENT SECTION NAME UNITS3 Remark ENGLISH METRIC 32210 CHLOROPHYLL-A TRICHROMATIC UNCORRECTED ug/L Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L 32211 CHLOROPHYLL-A SPECTROPHOTOME TRIC ACID. METH. ug/L Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L 32217 CHLOROPHYLL A FLUOROMETRIC UNCORRECTED ug/L Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L 80154 SUSP. SEDIMENT CONCENTRATION- EVAP. AT 110C mg/L Total Suspended Sediment (TSS) SEDTRN SSED (4) mg/L mg/L REMARKS a - HSPF uses mg/L ug/L, and concu/L for both English and metric systems. 1 - Units conversion required. 2 - RO is the total rate of outflow from RCHRES, O is the rate of outflow through an individual RCHRES exit; use LAST and AVER as PLTGEN transformations for instantaneous and mean daily flow, respectively. 3 - Make sure the same datum is used in STORET and HSPF (STCOR value in HYDR-PARM2). 4 - Requires BOD5/ BODy relationship; i.e., the BOD5 values from STORET must be converted to BODy for comparison to HSPF BOD concentrations. Note: there are roughly 25 other STORET codes for different number of reaction days (e.g. 00315, BOD - 7 day) each of which are valid but must be converted to BODy before comparison with HSPF output. 5 - If particulate NH4-N is simulated, the contribution from adsorbed ammonia can be accounted for by [[NUTRX(RSNH4 (4))] / HYDR(VOL)] * 0.368. 6 - HSPF does not distinguish between dissolved and particulate instream organics; corresponding STORET dissolved parameter (e.g. 00602 NITROGEN, DISSOLVED) could only be used if organic known to be largely in dissolved phase. 7 - Particulate nitrite and nitrate are not simulated in HSPF - they are assumed to be exclusively in the dissolved form (i.e. total N02-N03 is approximately equal to dissolved N02- N03). Thus, the comparison between measured (STORET) total nitrate (or nitrite) and modeled (HSPF) dissolved nitrate (or nitrite) is the most appropriate. Given the assumption that the total is largely dissolved, measured (STORET) dissolved nitrate (or nitrite) can be directly compared to modeled HSPF dissolved nitrate (nitrite). 8 - If particulate P04-P is simulated, the contribution from adsorbed orthophosphate can be accounted for by [[NUTRX(RSP04 (4))] / HYDR(VOL)] * 0.368. 9 - The CONS module can be used to simulate total dissolved solids, slowly degrading pesticides and herbicides, and other tracer substances as well. 8 ------- 10 - Module Section GQUAL simulates user defined generalized constituents with user-defined units. For fecal coliform - in the GQ-QALDATA use CONCID = '#/100 mL', CONV = 0.00353, & QTYID = '#ORG'. 9 ------- Table 2 ~ Modernized STORET Characteristics versus HSPF Output [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et Modernized STORET Characteristic HSPF OUTPUT* Display Name SEARCH NAME CONSTITUENT SECTION NAME UNITS1 Remark ENGLISH METRIC Temperature, water TEMPERATURE, WATER Water Temperature HTRCH TW DegC Temperature, water TEMPERATURE, WATER Water Temperature HTRCH TW DegF Surface area SURFACE AREA Surface Area HYDR SAREA ac ha Reservoir volume RESERVOIR VOLUME Volume in RCHRES HYDR VOL ac-ft Mm3 Velocity - stream VELOCITY - STREAM Average velocity (discharge/ average cross-section) HYDR AW EL flt/s m/s Flow FLOW Discharge HYDR RO, 0 cfs cms 2 Elevation, water surface, MSL ELEVATION, WATER SURFACE, MSL Stage (depth + stage correction) HYDR STAGE ft m 3 Stream stage STREAM STAGE Stage (depth + stage correction) HYDR STAGE ft 3 Dissolved oxygen DISSOLVED OXYGEN Dissolved Oxygen OXRX DOX mg/L mg/L BOD, Biochemical oxygen demand BOD Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L 4 BOD, carbonaceous BOD, CARBONACEOUS Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L 10 ------- Table 2 ~ Modernized STORET Characteristics versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et Modernized STORET Characteristic HSPF OUTPUT* Display Name SEARCH NAME CONSTITUENT SECTION NAME UNITS1 Remark ENGLISH METRIC BOD, ultimate carbonaceous BOD, ULTIMATE CARBONACEOUS Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L BOD, ultimate first stage BOD, ULTIMATE FIRST STAGE Ultimate Biochemical Oxygen Demand OXRX BOD mg/L mg/L PH PH PH PHCARB PHST(3) SU SU Nitrogen, organic NITROGEN, ORGANIC Total Organic Nitrogen PLANK PKST3 (4) mg/L as N mg/L as N 6 Nitrogen, ammonia NITROGEN, AMMONIA Ammonia (dissolved, unionized) NUTRX DNUST (6) mg/L as N mg/L as N Nitrogen, ammonium NITROGEN, AMMONIUM Ammonium (dissolved + adsorbed/pa rticulate) NUTRX DNUST (5) + RSNH4(4) mg/L as N mg/L as N 5 Nitrogen, ammonia + ammonium NITROGEN, AMMONIA+ AMMONIUM Ammonia (dissolved) plus Ammonium (dissolved + adsorbed/pa rticulate) NUTRX DNUST (2) + RSNH4(4) mg/L as N mg/L as N 5 Nitrogen, Nitrite NITROGEN, NITRITE Dissolved Nitrite NUTRX DNUST (3) mg/L as N mg/L as N 7 Nitrogen, Nitrate NITROGEN, NITRATE Dissolved Nitrate NUTRX DNUST (1) mg/L as N mg/L as N 7 Nitrogen, Kjeldahl NITROGEN, KJELDAHL Kjeldahl Nitrogen NUTRX, PLANK DNUST (2) + RSNH4(4) + PKST3 (4) mg/L as N mg/L as N 5, 6 11 ------- Table 2 ~ Modernized STORET Characteristics versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et Modernized STORET Characteristic HSPF OUTPUT* Display Name SEARCH NAME CONSTITUENT SECTION NAME UNITS1 Remark ENGLISH METRIC Nitrogen, ammonia + organic NITROGEN, AMMONIA+ ORGANIC Kjeldahl Nitrogen NUTRX, PLANK DNUST (2) + RSNH4(4) + PKST3 (4) mg/L as N mg/L as N 5, 6 Nitrogen, Nitrite + Nitrate NITROGEN, NITRITE + NITRATE Nitrite plus Nitrate NUTRX DNUST (1) + DNUST(3) mg/L as N mg/L as N 7 Nitrogen, inorganic NITROGEN, INORGANIC Inorganic Nitrogen NUTRX DNUST(1 -3) + RSNH4(4) mg/L as N mg/L as N 5, 7 Phosphorus, orthophosphate as P PHOSPHORUS, ORTHOPHOSPHATE AS P Dissolved Ortho- phosphate NUTRX DNUST(4) mg/L as P mg/L as P Phosphorus, orthophosphate as P PHOSPHORUS, ORTHOPHOSPHATE AS P Particulate Ortho- phosphate NUTRX RSP04(4) mg/L as P mg/L as P 8 Phosphorus PHOSPHORUS Total Phosphorus NUTRX, PLANK DNUST (4) + RSP04(4) + PKST3 (5) mg/L as P mg/L as P 6, 8 Phosphorus as P PHOSPHORUS AS P Total Phosphorus NUTRX, PLANK DNUST (4) + RSP04(4) + PKST3 (5) mg/L as P mg/L as P 6, 8 Phosphorus, organic as P PHOSPHORUS, ORGANIC AS P Total Organic Phosphorous (TORP) NUTRX PKST3(5) mg/L as P mg/L as P 6 Total Organic Carbon (TOC) CARBON, TOTAL ORGANIC Total Organic Carbon PLANK PKST3 (6) mg/L as C mg/L as C 6 12 ------- Table 2 ~ Modernized STORET Characteristics versus HSPF Output (continued) [* - Some constituents composed of multiple HSPF time series output; refer to USEPA STORET (USEPA, 2000) database and HSPF User's Manual (Bicknell, et Modernized STORET Characteristic HSPF OUTPUT* Display Name SEARCH NAME CONSTITUENT SECTION NAME UNITS1 Remark ENGLISH METRIC Total Inorganic Carbon CARBON, TOTAL INORGANIC Total Inorganic Carbon (TIC) PHCARB PHST(1) mg/L as C mg/L as C Chloride CHLORIDE Conservative Substance CONS CON(1) user defined user defined 9 Total Fecal Coliform COLIFORM, TOTAL FECAL General Quality Constituent (Total Coliform) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 Streptococcus, fecal STREPTOCOCCUS, FECAL General Quality Constituent (Fecal Streptococci) GQUAL DQAL (1,2, or 3) concu/L concu/L 10 Chlorophyll a (probe relative fluorescence) CHLOROPHYLL A (PROBE RELATIVE FLUORESCENCE) Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L Chlorophyll a (probe) CHLOROPHYLL A (PROBE) Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L Chlorophyll a, corrected for pheophytin CHLOROPHYLL A, CORRECTED FOR PHEOPHYTIN Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L Chlorophyll a, uncorrected for pheophytin CHLOROPHYLL A, UNCORRECTED FOR PHEOPHYTIN Phytoplankton as Chlorophyll a PLANK PHYCLA ug/L ug/L Total Suspended Solids (TSS) SOLIDS, TOTAL SUSPENDED Total Suspended Sediment (TSS) SEDTRN SSED (4) mg/L mg/L 13 ------- REMARKS a - HSPF uses mg/L ug/L, and concu/L for both English and metric systems. 1 - Units conversion may be required. STORET (modernized) characteristics are units independent; units are reported separately. 2 - RO is the total rate of outflow from a RCHRES, O is the rate of outflow through an individual RCHRES exit; use LAST and AVER as PLTGEN transformations for instantaneous and mean daily flow, respectively. 3 - Make sure the same datum (e.g. Mean Sea Level [MSL]) is used in STORET and HSPF (STCOR value in HYDR-PARM2). 4 - Check method used to obtain BOD value. If BOD refers to other than ultimate BOD (BODy), a BODt/ BODy relationship is required. The BOD, values from STORET must be converted to BODy for comparison to HSPF BOD concentrations. 5 - If particulate NH4-N is simulated, the contribution from adsorbed ammonia is accounted for by [[NUTRX(RSNH4 (4))] / HYDR(VOL)] * 0.368. 6 - HSPF does not distinguish between dissolved and particulate instream organics. 7 - Particulate nitrite and nitrate are not simulated in HSPF - they are assumed to be exclusively in the dissolved form (i.e. total N02-N03 is approximately equal to dissolved N02- N03). Thus, the comparison between measured (STORET) total nitrate (or nitrite) and modeled (HSPF) dissolved nitrate (or nitrite) is the most appropriate. Given the assumption that the total is largely dissolved, measured (STORET) dissolved nitrate (or nitrite) can be directly compared to modeled HSPF dissolved nitrate (nitrite). 8 - If particulate P04-P is simulated, the contribution from adsorbed orthophosphate is accounted for by [[NUTRX(RSP04 (4))] / HYDR(VOL)] * 0.368. 9 - The CONS module can be used to simulate total dissolved solids, slowly degrading pesticides and herbicides, and other tracer substances as well. 10 - Module Section GQUAL simulates user defined generalized constituents with user-defined units. For fecal coliform - in the GQ-QALDATA use CONCID = '#/100 mL', CONV = 0.00353, & QTYID = '#ORG'. 14 ------- References Bicknell, et al, 1996. Bicknell, Brian R., John C. Imhoff, John L. Kittle, and Anthony S. Donigian. Hydrological Simulation Program - FORTRAN: User's Manual for Release 11. USEPA, 1996. USEPA, 2000. STOrage and RETrieval (STORET) System web site. http://www.epa.gov/owowwtrl/STORET/. 15 ------- |