U.S. ENVIRONMENTAL PROTECTION AGENCY NATIONAL EUTROPHICATION SURVEY WORKING PAPER SERIES REPORT ON BIG CREK RESERVOIR POLXCOUMY IOWA EPA REGION VII WORKING PAPER No, 495 CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON and ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA •&G.P.O. 699-440 ------- REPORT ON BIG CREK RESERVOIR POLK COUNTY IOWA EPA REGION VII WORKING PAPER No, 495 WITH THE COOPERATION OF THE IOWA DEPARTMENT OF ENVIRONMENTAL QUALITY AND THE IOWA NATIONAL GUARD AUGUST, 1976 ------- CONTENTS Page Foreword ii List of Iowa Study Lakes iv Lake and Drainage Area Map v Sections I. Conclusions 1 II. Lake and Drainage Basin Characteristics 3 III. Lake Water Quality Summary 4 IV. Nutrient Loadings 8 V. Literature Reviewed 12 VI. Appendices 13 ------- 11 FOREWORD The National Eutrophication Survey was initiated in 1972 in response to an Administration commitment to investigate the nation- wide threat of accelerated eutrophication to freshwater lakes and reservoirs. OBJECTIVES The Survey was designed to develop, in conjunction with state environmental agencies, information on nutrient sources, concentrations, and impact on selected freshwater lakes as a basis for formulating comprehensive and coordinated national, regional, and state management practices relating to point-source discharge reduction and non-point source pollution abatement in lake watersheds. ANALYTIC APPROACH The mathematical and statistical procedures selected for the Survey's eutrophication analysis are based on related concepts that: a. A generalized representation or model relating sources, concentrations, and impacts can be constructed. b. By applying measurements of relevant parameters associated with'lake degradation, the generalized model can be transformed into an operational representation of a lake, its drainage basin, and related nutrients. c. With such a transformation, an assessment of the potential for eutrophication control can be made. LAKE ANALYSIS In this report, the first stage of evaluation of lake and water- shed data collected from the study lake and its drainage basin is documented. The report is formatted to provide state environmental agencies with specific information for basin planning [§303(e)], water quality criteria/standards review [§303(c)], clean lakes [§314(a,b)], and water quality monitoring [§106 and §305(b)] activities mandated by the Federal Water Pollution Control Act Amendments of 1972. ------- iii Beyond the single lake analysis, broader based correlations between nutrient concentrations (and loading) and trophic condi- tion are being made to advance the rationale and data base for refinement of nutrient water quality criteria for the Nation's freshwater lakes. Likewise, multivariate evaluations for the relationships between land use, nutrient export, and trophic condition, by lake class or use, are being developed to assist in the formulation of planning guidelines and policies by EPA and to augment plans implementation by the states. ACKNOWLEDGMENT The staff of the National Eutrophication Survey (Office of Research & Development, U. S. Environmental Protection Agency) expresses sincere appreciation to the Iowa Department of Environ- mental Quality for professional involvement, to the Iowa National Guard for conducting the tributary sampling phase of the Survey, and to those wastewater treatment plant operators who voluntarily provided effluent samples and flow data. The staff of the Water Quality Division of the Department of Environmental Quality provided invaluable lake documentation and counsel during the Survey, reviewed the preliminary reports, and provided critiques most useful in the preparation of this Working Paper series. Major General Joseph G. May, the Adjutant General of Iowa, and Project Officer Colonel Cleadeth P. Woods, who directed the volunteer efforts of the Iowa National Guardsmen, are also grate- fully acknowledged for their assistance to the Survey. ------- IV NATIONAL EUTROPHICATION SURVEY STUDY LAKES STATE OF IOWA LAKE NAME COUNTY Ahquabi Warren Big Creek Reservoir Polk Black Hawk Sac Clear Cerro Gordo Darling Washington Lost Island Clay, Palo Alto MacBride Johnson Prairie Rose Shelby Rathbun Reservoir Appanoose, Wayne Red Rock Reservoir Marion Rock Creek Jasper Silver Worth Spirit Dickinson Viking Montgomery West Okoboji Dickinson ------- Iowa Map Location BIG CREEK RESERVOIR ® Tributary Sampling Site X Lake Sampling Site -^~? Drainage Area Boundary 4200- 2 3 Scale JKm. Mi. 4150- 9350 I Spillway to Saylorville Reservoir I 93 40 ------- BIG CREEK RESERVOIR STORE! NO. 1902 I. CONCLUSIONS A. Trophic Condition: Survey data indicate that Big Creek Reservoir is eutrophic. It ranked ninth in overall trophic quality when the 15 Iowa lakes and reservoirs sampled in 1974 were compared using a com- bination of six lake parameters*. One of the water bodies had less and one had the same median total phosphorus, seven had less median orthophosphorus, all of the others had less median inorganic nitrogen, six had less mean chlorophyll a., and three had greater mean Secchi disc transparency. Depression of dissolved oxygen with depth occurred at both stations in July. Macrophytes reportedly occur in the shallower upper portion of the reservoir but not in the lower part (Paragamian, 1974). B. Rate-Limiting Nutrient: The algal assay results indicate that Big Creek Reservoir was limited by phosphorus at the time the sample was collected (09/25/74). The reservoir data indicate phosphorus limitation in April as well. C. Nutrient Controllability: 1. Point sources—No known point sources impacted Big * See Appendix A. ------- 2 Creek Reservoir during the sampling year. All sewage from the surrounding Big Creek State Recreation Area is diverted from the reservoir (Ossian, 1976). The reservoir phosphorus loading of 2.27 g/m2 measured during the sampling year is almost four times that proposed by Vollen- weider (Vollenweider and Dillon, 1974) as a eutrophic loading (see page 11). Most of this probably resulted from agricultural activi- ties. 2. Non-point sources—All of the phosphorus entering the reservoir during the sampling year came from non-point sources. Nearly 45% of the load was contributed by Big Creek, about 37% by Little Creek, and about 18% by minor tributaries and immedi- ate drainage. ------- II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1" A. Lake Morphometry : 1. Surface area: 3.44 kilometers2. 2. Mean depth: 6.7 meters. 3. Maximum depth: 15.5 meters. 4. Volume: 23.048 x 106 m3. 5. Mean hydraulic retention time: 269 days. B. Tributary and Outlet: (See Appendix C for flow data) 1. Tributaries - Drainage Mean flow Name area (km2)* (m3/sec)* Big Creek 104.6 0.51 Little Creek 53.9 0.26 Minor tributaries & immediate drainage - 41.7 0.22 Totals 200.2 0.99 2. Outlets - Big Creek and Spillway to 203.6** .0.99 Saylorville Reservoir,^combined. C. Precipitation***: 1. Year of sampling: 73.0 centimeters. 2. Mean annual: 78.4 centimeters. t Table of metric conversions—Appendix B. tt Harrison, 1975. * For limits of accuracy, see Working Paper No. 175, "...Survey Methods, 1973-1976". ** Includes area of reservoir. *** See Working Paper No. 175. ------- 4 III. LAKE WATER QUALITY SUMMARY Big Creek Reservoir was sampled three times during the open-water season of 1974 by means of a pontoon-equipped Huey helicopter. Each time, samples for physical and chemical parameters were collected from a number of depths at two stations on the reservoir (see map, page v). During each visit, a single depth-integrated (4.6 m to sur- face) sample was composited from the stations for phytoplankton identi- fication and enumeration; and during the last visit, a single 18.9- liter depth-integrated sample was composited for algal assays. Also each time, a depth-integrated sample was collected from each of the stations for chlorophyll a^ analysis. The maximum depths sampled were 15.2 meters at station 1 and 7.6 meters at station 2. The sampling results are presented in full in Appendix D and are summarized in the following table (the July nutrient samples were not preserved properly and were not analyzed). ------- A. SUMMARY OF PHYSICAL AND CHEMICAL CHARACTERISTICS FOR BIG CREEK RESERVOIR STORET CODE 1902 PARAMETER TEMP (C) DISS OXY (MG/L> CNOCTVV (MCROMO) PH (STAND UNITS) TOT ALK (MG/L) TOT P (MG/LI ORTHO P (MG/L) N02+N03 (MG/L) AMMONIA (MG/L) KJEL N (MG/L) INORG N (MG/L) TOTAL N (MG/L) CHLRPYL A (UG/L) SECCHI (METERS) 1ST RANGE 7.8 - 9.8 - 252. - 8.3 - 290. ~ 0.059 - 0 0.013 - 0 5.740 ~ 7 0.020 - 0 0.500 - 1 5.860 - 7 6.340 - 8 26.0 - 0.8 - SAMPLING ( 4/18/74) 2 11.8 16.4 439. 8.5 380. .105 .049 .590 .170 .100 .610 .090 42.0 1.1 SITES MEAN 9.8 12.8 352. 8.4 328. 0.075 0.029 6.739 0.071 0.71? 6.810 7.451 34.0 0.9 MEDIAN 9.8 11.4 381. 8.5 328. 0 .075 0.027 6.745 0.060 0.700 6.830 7.480 34.0 0.9 2ND SAMPLING ( 7/ 9/74) 2 SITES RANGE MEAN MEDIAN 13.2 - 26.7 22.5 24.3 0.2 - 8.0 6.0 7.4 507. - 630. 582. 590. 7.8 - 8.4 8.1 8.3 *«*«** _*****»•*••**•**••>**** *««»*« _««**•«***»*****»*•**** *»**«« -»«»«*»<>•*«»«•»**•«***« 2.7 - 12.8 7.7 7.7 1.2 - 1.2 1.2 1.2 3RD RANGE 16.9 - 6.6 - 440. - 7.7 - 226. ~ 0.024 •• 0 0.006 • 0 5.320 ~ 7 0.070 ~ 0 0.400 - 0 5.430 - 7 5.720 - 7 8.4 - 2.4 - SAMPLING ( 9/25/74) 2 18.1 9.2 450. 7.9 3CQ 258. All .033 A 1 A • 01O • 440 .120 .600 .510 .840 9.3 2.6 SITES MEAN 17.4 7.8 446. 7.8 242. 0.028 OA AT .007 6.031 0.095 0.450 6.126 6.481 8.8 2.5 MEDIAN 17.4 7.7 448. 7.8 241. 0.029 OA A f .00 7 5.755 0.095 0.400 5.855 6.235 8.8 2.5 ------- B. Biological characteristics: 1. Phytoplankton - Sampling Date 04/18/74 07/09/74 09/25/74 2. Chlorophyll a_ - Sampling Date 04/18/74 07/09/74 09/25/74 Dominant Genera 1. 2. 3. 4. 5. 1. 2. 3. 1. 2. 3. 4. 5. Stephanodiscus sp. Flagellates Ankistrodesmus s£. Chlamydomonas sp. Gymnodinium sp. Other genera Total Asterionella sp. Stephanodiscus SJK Flagellates Total Melosira sp. Fragilaria sp. Stephanodiscus sp. Aphanizomenon SJD. Aphanothece sp. Other genera Algal Units per ml 14,887 665 250 208 166 416 16,592 595 457 46 1 ,098 1,167 257 40 40 40 117 Total Station Number 1 2 1 2 1 2 1,661 Chlorophyll a_ (ug/D 42.0 26.0 12.8 2.7 8.4 9.3 ------- 7 C. Limiting Nutrient Study: 1. Autoclaved, filtered, and nutrient spiked - Ortho P Inorganic N Maximum yield Spike (mg/1) Cone, (mg/1) Cone, (mg/1) (mg/1-dry wt.) Control 0.005 5.070 0.1 0.050 P 0.055 5.070 3.3 0.050 P + 1.0 N 0.055 6.070 3.5 1.0 N 0.005 6.070 0.1 2. Discussion - The control yield of the assay alga, Selenastrum capri- cornutum, indicates that the potential primary productivity of Big Creek Reservoir was low at the time the assay sample was collected (09/25/74). Also, a significant increase in yield with the addition of phosphorus alone indicates that the lake was limited by phosphorus at that time. Note that the addition of nitrogen alone resulted in a yield identical to that of the control. The reservoir data indicate phosphorus limitation in April as well as in September (the mean inorganic nitrogen to orthophosphorus ratios were 235 to 1 and 875 to 1, respec- tively). ------- 8 IV. NUTRIENT LOADINGS (See Appendix E for data) For the determination of nutrient loadings, the Iowa National Guard collected monthly near-surface grab samples from each of the tributary sites indicated on the map (page v), except for the high runoff period from May through July when samples were collected approximately every two weeks. Sampling was begun in August, 1974, and was completed in July, 1975. Through an interagency agreement, stream flow estimates for the year of sampling and a "normalized" or average year were provided by the Iowa District Office of the U.S. Geological Survey for the tributary sites nearest the reservoir. In this report, nutrient loads for sampled streams were determined using a modification of a U.S. Geological Survey computer program for calculating stream loadings*. The combined outlet loads are based on nutrient concentrations measured at the Big Creek outlet (A-l), but nutrient data for both outlets are included in Appendix E. Nutrient loads shown are those measured minus point-source loads, if any. Nutrient loads for unsampled "minor tributaries and immediate drainage" ("ZZ" of U.S.G.S.) were estimated using the nutrient loads at station A-2, in kg/km2/year, and multiplying by the ZZ area in km2. No known point sources impacted Big Creek Reservoir during the sampling year. * See Working Paper No. 175. ------- 9 A. Waste Sources: 1. Known municipal - None 2. Known industrial - None B. Annual Total Phosphorus Loading - Average Year: 1. Inputs - kg P/ % of Source y_r total a. Tributaries (non-point load) - Big Creek 3,485 44.7 Little Creek 2,880 36.9 b. Minor tributaries & immediate drainage (non-point load) - 1,375 17.6 c. Known municipal STP's - None d. Septic tanks - None e. Known industrial - None f. Direct precipitation* - 60_ 0.8 Total 7,800 100.0 2. Outputs - Lake outlets - Big Creek and 2,055 Spillway 3. Net annual P accumulation - 5,745 kg. * See Working Paper No. 175. ------- 10 Annual Total Nitrogen Loading - Average Year: 1. Inputs - kg N/ Source yj; a. Tributaries (non-point load) - Big Creek 186,220 Little Creek 105,050 b. Minor tributaries & immediate drainage (non-point load) - 74,225 c. Known municipal STP's - None d. Septic tanks - None e. Known industrial - None f. Direct precipitation* - Total 2. Outputs - Lake outlets - Big Creek and Spillway 3.715 369,210 201,830 3. Net annual N accumulation - 167,380 kg. Non-point Nutrient Export by Subdrainage Area: Tributary kg P/km2/yr Big Creek Little Creek 33 53 % of total 50.4 28.5 20.1 1.0 100.0 kg N/km2/yr 1,780 1,949 * See Working Paper No. 175. ------- 11 E. Yearly Loads: In the following table, the existing phosphorus loadings are compared to those proposed by Vollenweider (Vollenweider and Dillon, 1974). Essentially, his "dangerous" loading is one at which the receiving water would become eutrophic or remain eutrophic; his "permissible" loading is that which would result in the receiving water remaining oligotrophic or becoming oligotrophic if morphometry permitted. A meso- trophic loading would be considered one between "dangerous" and "permissible". Note that Vollenweider's model may not be applicable to water bodies with short hydraulic retention times. Total Phosphorus Total Nitrogen Total Accumulate? Total Accumulated grams/m2/yr 2.27 1.67 107.3 48.7 Vollenweider phosphorus loadings (g/m2/yr) based on mean depth and mean hydraulic retention time of Big Creek Reservoir: "Dangerous" (eutrophic loading) 0.58 "Permissible" (oligotrophic loading) 0.29 ------- 12 V. LITERATURE REVIEWED Ossian, Roger (Recreation Area Officer), 1976. Personal communication (State Recreation Area sewage disposal system). Big Creek Reser- voir State Recreation Area, Polk City. Harrison, Harry M., 1975. Personal communication (reservoir mor- pheme try) . IA Cons. Comm., Des Moines. Paragamian, Vaughn L., 1974. Man-made lake investigations. Fed. Aid to Fish Rest. Proj. No. F-88-R-1, IA Cons. Comm., Des Moines. Vollenweider, R. A., and P. J. Dillon, 1974. The application of the phosphorus loading concept to eutrophication research. Natl. Res. Council of Canada Publ. No. 13690, Canada Centre for Inland Waters, Burlington, Ontario. ------- VI. APPENDICES APPENDIX A LAKE RANKINGS ------- LAKE DATA TO BE USED IN RANKINGS LAKE CODE LAKE NAME 1901 LAKE ACOUAdI 1902 BIG CREEK RESERVOIR 1903 BLACK HAWK LAKE 1904 CLEAR LAKE 1905 LAKE DARLING 1906 LOST ISLAND LAKE 1907 LAKE MACBRIDE 1908 PRAIRIE ROSE LAKE 1909 RATHBUN RESERVOIR 1910 RED ROCK LAKE 1911 ROCK CREEK LAKE 1912 SILVER LAKE 1913 SPIRIT LAKE 1914 VIKING LAKE 1915 WEST LAKE OKOBOJI MEDIAN TOTAL i3 0.062 0.046 0.185 0.059 0.077 0.146 0.061 0.056 0.071 0.180 0.065 0.193 0.041 0.075 0.046 MEDIAN INORG N 0.335 6.465 0.130 0.070 1.475 0.065 2.035 0.210 1.170 1.880 1.400 0.565 0.090 0.130 0.060 500- MEAN SEC 46V. 333 438.500 488.167 465.125 482.500 421.167 458.444 463.667 475.889 473.400 480.500 482.667 422.667 459.000 380.444 MEAN CHLOKA 8.600 16.867 49.740 17.400 13.817 36.100 17.067 17.350 12.039 14.730 18.367 95.300 12.622 26.033 7.722 15- MIN 00 8.200 14.800 15.000 8.600 9.200 8.400 15.000 8.600 14.000 14.000 8.400 10.000 9.000 14.200 15.000 MEDIAN DISS OKTnO P 0.009 0.011 0.020 0.010 0.012 0.021 0.010 0.010 0.008 0.104 0.007 0.034 0.007 0.017 0.017 ------- PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES) LAKE CODE LAKE NAME 1901 LAKE 1903 BIG CREEK RESERVOIR 1903 BLACK HAWK LAKE 1904 CLEAR LAKE 1905 LAKE DARLING 1906 LOST ISLAND LAKE 1907 LAKE M4CBRIDE 1908 PRAIRIE ROSE LAKE 1909 RATHBUN RESERVOIR 1910 RED POCK LAKE 1911 ROCK CREEK LAKE 1912 SILVER LAKE 1913 SPIRIT LAKE 1914 VIKING LAKE 1915 WEST LAKE OKOBOJI MEDIAN TOTAL P 57 ( 89 ( 7 ( 71 ( 29 ( 21 ( 64 ( 79 < 43 ( 14 < 50 ( 0 ( 100 ( 36 ( 89 ( 8) 12) 1) 10) 4) 3) 9) 11) 6) 2) 7) 0) 14) 5) 12) MEDIAN INO*G N 50 ( 0 ( 68 ( 86 ( 21 ( 93 ( 7 ( 57 ( 36 ( 14 ( 29 ( 43 ( 79 ( 68 ( 100 ( 7) 0) 9) 12) 3) 13) 1) 8) 5) 2) 4) 6) 11) 9) 14) 500- MEAN SEC 43 I 79 ( 0 < 50 ( 14 ( 93 ( 71 ( 57 ( 29 ( 36 ( 21 < 7 ( 66 ( 64 ( 100 ( 6) 11) 0) 7) 2) 13) 10) 8) 4) 5) 3) 1) 12) 9) 14) MEAN CHLORA 93 ( 57 ( 7 < 36 ( 71 ( 1* ( 50 < 43 < 86 ( 64 ( 2* ( 0 ( 79 ( 21 ( 100 ( 13) 8) 1) 5) 10) 2) 7) 6) 12) 9) 4) 0) 11) 3) 14) 15- MIN DO 100 I 21 < 7 ( 75 ( 57 ( 89 ( 7 ( 75 ( 39 ( 39 t 89 ( 50 ( 64 ( 29 ( 7 ( 14) 3) 0) 10) 8) 12) 0) 10) 5) 5) 12) 7) 9) 4) 0) MEDIAN DISS ORTHO P 79 ( 50 ( 21 ( 64 ( 43 ( 14 ( 64 < 64 ( 86 ( 0 ( 96 ( 7 ( 96 ( 32 ( 32 ( 11) 7) 3) 8) 6) 2) 8) 8) 12) 0) 13) 1) 13) 4) 4) INDEX NO 422 296 110 382 235 324 263 375 319 167 314 107 504 250 428 ------- LAKES RANKED BY INDEX NOS. RANK LAKE CODE LAKE NAME INDEX NO 1 1913 SPIRIT LAKE 504 2 1915 WEST LAKE OK080JI 428 3 1901 LAKE ACOUABI 422 4 1904 CLEAR LAKE 382 5 1908 PRAIRIt ROSE LAKE 375 6 1906 LOST ISLAND LAKE 324 7 1909 RATHBUN RESERVOIR 319 8 1911 ROCK CREEK LAKE 314 9 1902 BIG CREEK RESERVOIR 296 10 1907 LAKE HACBRIDE 263 11 1914 VIKING LAKE 250 12 1905 LAKE DARLING 235 13 1910 RED ROCK LAKE 167 14 1903 BLACK HAWK LAKE HO 15 1912 SILVER LAKE 107 ------- APPENDIX B CONVERSION FACTORS ------- CONVERSION FACTORS Hectares x 2.471 = acres Kilometers x 0.6214 = miles Meters x 3.281 = feet -4 Cubic meters x 8.107 x 10 = acre/feet Square kilometers x 0.3861 = square miles Cubic meters/sec x 35.315 = cubic feet/sec Centimeters x 0.3937 = inches Kilograms x 2.205 = pounds Kilograms/square kilometer x 5.711 = Ibs/square mile ------- APPENDIX C TRIBUTARY FLOW DATA ------- TRIBUTARY FLOW INFORMATION FUR IOWA LAKE CODE 1902 BIG CREEK RES. TOTAL DRAINAGE AREA OF LAKE(SO KM) 203.6 02/05/76 SUB-DRAINAGE TRIBUTARY AREA(SO KM) NORMALIZED FLOWS(CMS) JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MEAN 1902A1 1902A2 1902B1 1902ZZ 203.6 104.6 53.9 45.1 0 0 0 0 .31 0.75 1.58 1.38 .16 0.39 0.81 0.71 .08 0.20 0.42 0.37 .07 0.17 0.35 0.31 1.22 0.63 0.32 0.27 1.23 0.63 0.33 0.27 0.88 0.45 0.23 0.18 0.49 0.25 0.13 0.11 1.61 0.83 0.43 0.36 1 0 0 0 .06 .55 .28 .24 0.88 0.45 0.23 0.20 0.43 0.22 0.11 0.10 0.99 0.51 0.26 0.22 SUMMARY 0 iu TAL DRAINAGE AREA OF LAKE = M OF SUB-DRAINAGE AREAS = 203.6 203.6 TOTAL FLOW TOTAL FLOW IN * OUT » 11.82 11.84 MOTE *«« Cl NORMALIZED FLOWS INCLUDED IN Al MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS) TRIBUTARY MONTH YEAR 1902A1 MEAN FLOW DAY 1902A2 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 74 74 74 74 74 75 75 75 75 75 75 75 74 74 74 74 74 75 75 75 75 75 75 75 0.03 0.05 0.04 0.04 0.03 0.03 0.03 0.04 0.06 0.06 0.04 0.03 0.07 0.06 0.05 0.12 0.11 0.10 0.07 0.91 1.22 0.62 2.07 0.42 17 24 24 23 23 27 20 28 10 20 18 17 24 24 23 23 27 20 28 10 20 18 FLOW DAY 0.03 0.05 0.04 0.04 0.03 0.03 0.03 FLOW DAY FLOW 0.06 0.06 0.04 0.03 0.08 0.03 0.02 0.07 0.10 0.07 0.07 2.21 0.59 1.64 0.20 19 0.06 31 0.06 19 0.42 31 1.08 ------- TRIBUTARY FLOtel INFORMATION FOR IOWA 03/05/76 LAKE CODE 1902 BIG CREEK RESc MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS) TRIBUTARY MONTH YEAR MEAN FLOW DAY 190281 1902C1 19022Z 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 74 74 74 74 74 75 75 75 75 75 75 75 74 74 74 74 74 75 75 75 75 75 75 75 74 74 74 74 74 75 75 75 75 75 75 75 0.04 Oo03 ®o@2 @986 9.®5 0,05 0.®4 Oo48 0.62 0.34 1.08 0.22 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.73 2.29 1.19 3.57 0.71 0.03 0.03 0.02 0.05 0.05 0.04 0.03 0.40 0.51 0.27 0.91 0.18 17 24 24 23 23 27 20 28 10 20 18 17 24 24 23 23 27 20 28 10 20 18 FLOH DAY 0.06 0.01 OoOl 0003 0.05 0.04 0.03 1.13 0.31 0.85 0.10 0.0 0.0 0.0 0.0 0.0 0.0 0.0 4.22 1.10 2.83 0.34 FLOW DAY FLOtel 19 0.23 31 0.54 19 0.79 31 2.®! ------- APPENDIX D PHYSICAL and CHEMICAL DATA ------- STORET RETRIEVAL DATE 75/13/23 190201 42 05 24.0 094 02 54.0 BIG CREEK RESERVOIR 19015 IOWA 11EPALES DATE FROM TO 74/04/18 74/07/09 74/09/25 DATE FROM TO 74/04/18 74/07/09 74/09/25 TIME DEPTH OF DAY FE£T 15 40 0000 15 40 0005 15 40 0015 15 40 0025 15 40 0050 10 10 0000 10 10 0005 10 10 0015 10 10 0025 10 10 0050 13 35 0000 13 35 0005 13 35 0019 13 35 0038 TIME DEPTH OF DAY FEET 15 40 0000 15 40 0005 15 40 0015 15 40 0025 15 40 0050 10 10 0000 13 35 0000 13 35 0002 13 35 0005 13 35 0019 13 35 0038 00010 WATER TEMP CENT 11.8 11.1 9.8 8.7 7.8 25.1 24.9 24.3 19.5 13.2 17.6 17.4 17.4 17.3 00665 PHOS-TOT MG/L P 0.059 0.072 0.065 0.059 0.105 0.029 0.026 0.029 0.033 00300 00 MG/L 16.4 14.2 11.4 9.8 7.8 7.8 7.4 4.8 0.2 8.0 7.4 7.2 7.2 32217 CHLRPHYL A UG/L 42.0 12.8 8.4 00077 TRANSP SECCHI INCHES 43 48 96 00031 INCDT LT REMNING PERCENT 50.0 1.0 00094 CNDUCTVY FIELD MICROMHO 252 319 381 406 439 610 600 590 507 560 448 448 448 447 3 00400 PH SU 8.50 8.40 8.30 8.30 8.40 8.40 8.40 8.30 7.80 7.80 7.74 7.7<» 7.72 7.73 00410 T ALK CAC03 MG/L 290 290 325 330 320 232 242 240 226 2111202 0055 00610 NH3-N TOTAL - MG/L 0.030 0.050 0.080 0.170 0.030 0.120 0.120 0.120 0.110 FEET 00 TOT 1 N MG, 0 0 0 0 1 0 0 0 0 DEPTH 0.800 0.700 0.600 0.700 100 600 400 0.500 400 00630 N02&N03 N-TOTAL MG/L 6.980 6.590 7.270 6.900 6.260 5.950 5.730 5.690 5.320 00671 PHOS-DIS ORTHO MG/L P 0.013 0.020 0.035 0.049 0.014 0.007 0.007 0.010 0.008 ------- STORE? RETRIEVAL DATE 75/12/33 190203 42 05 24.0 094 02 54.0 BIG CREEK RESERVOIR 19015 IOWA DATE FROM TO 74/04/18 74/07/09 74/09/25 DATE FROM TO 74/04/18 74/07/09 74/09/25 TIME DEPTH OF DAY FEET 16 05 0000 16 05 0005 16 05 0015 16 05 0025 10 45 0000 10 45 0005 10 45 0015 10 45 0025 14 10 0000 14 10 0005 14 10 0017 14 10 0025 TIME DEPTH OF DAY FEET 16 05 0000 16 05 0005 16 05 0015 16 05 0025 10 45 0000 14 10 0000 14 10 0003 14 10 0005 14 10 0017 14 10 0025 00010 WATER TEMP CENT 11.2 10.3 9.2 8.0 26.7 26.4 23.3 19.5 18.1 17.6 17.1 16.9 00665 PHOS-TOT MG/L P 0.083 0.078 0.081 0.024 0.029 0.026 0.030 00300 DO MG/L 15.4 11.4 10.8 8.0 8.0 6.0 3.6 9.2 6.6 8.4 8.6 32217 CHLRPHYL A UG/L 26.0 2.7 9.3 00077 00094 TRANSP CNDUCTVY SECCHI FIELD INCHES MICROMHO 30 255 310 391 414 48 630 623 586 531 104 450 444 441 440 00031 INCDT LT REMNING PERCENT 50.0 1.0 11EPALES 2111202 3 0030 FEET DEPTH 00400 00410 00610 00625 00630 00671 PH T ALK NH3-N TOT KJEL N02&N03 PHOS-DIS CAC03 TOTAL N SU MG/L MG/L MG/L 8.50 8.50 340 0.070 0.700 8.50 380 0.120 0.600 8.50 350 0.020 0.500 8.40 8.30 8.10 7.80 7.91 258 0.080 0.500 7.90 248 0.070 0.400 7.90 252 0.070 0.400 7.89 234 0.070 0.400 N-TOTAL ORTHO MG/L MG/L P 6.580 0.039 5.740 0.045 7.590 0.020 . 5.780 0.006 7.440 0.007 5.650 0.006 6.690 0.009 ------- APPENDIX E TRIBUTARY DATA ------- STORE! RETRIEVAL DATE 76/01/27 1902A1 41 47 40.0 093 43 00.0 BIG CREEK 19 7.5 SLATER 0/BIG CREEK RESERVOIR BELO DAM SPLLWAY 1.5 MI N OF POLK CITY 11EPALES 2111204 4 0000 FEET DEPTH DATE FROM TO 74/09/24 74/11/25 74/12/23 75/01/27 75/02/20 75/04/28 75/05/10 75/05/19 75/05/31 75/06/20 75/07/18 75/07/31 TIME DEPTH OF DAY FEET 15 40 14 30 11 05 15 25 15 30 11 35 19 40 10 55 17 20 09 50 10 05 10 40 00630 N02&N03 N-TOTAL MG/L 3.400 4.100 4.600 5.040 5.280 4.600 4.730 4.400 4.300 4.300 4.400 4.000 00625 TOT KJEL N MG/L 0.900 0.600 0.600 0.700 0.600 0.700 1.200 1.250 0.500 1.500 1.500 1.600 00610 NH3-N TOTAL MG/L 0.010 0.100 0.095 0.144 0.144 0.035 0.140 0.195 0.210 0.360 0.590 0.710 00671 PHOS-DIS ORTHO MG/L P 0.025 0.010 0.050 0.040 0.088 0.020 0.035 0.020 0.010 0.045 0.120 0.140 00665 PHOS-TOT MG/L P 0.070 0.030 0.060 0.050 0.100 0.050 0.050 0.030 0.120 0.110 0.130 0.180 ------- STORET RETRIEVAL DATE 76/02/09 1902A2 41 50 55.0 093 46 00.0 BIG CREEK 19153 7.5 GRANGER T/BIG CREEK RESERVOIR LGHT DTY RD BRDG 2.75 MI SE OP MADRID 11EPALES 2111204 4 0000 FEET DEPTH 00630 DATE TIME DEPTH N02&N03 FROM OF TO DAY FEET 74/08/17 15 05 74/09/24 10 55 74/10/24 12 50 74/11/23 14 30 74/12/23 10 20 75/04/28 11 05 75/05/10 19 15 75/05/19 10 25 75/05/31 16 45 75/06/20 09 25 75/07/18 09 40 75/07/31 10 15 N-TOTAL MG/L 4.400 0.128 0.024 6.750 6.780 7.200 10.000 9.600 11.500 10.500 11.000 4.900 00625 TOT KJEL N MG/L 1.300 0.700 0.700 0.400 0.700 0.550 1.400 1.350 1.600 1.900 0.550 0.750 00610 NH3-N TOTAL MG/L 0.115 0.015 0.025 0.035 0.030 0.045 0.065 0.060 0.035 0.035 0.015 0.030 00671 PHOS-DIS ORTHO MG/L P 0.120 0.010 0.005 0.035 0.045 0.130 0.060 0.025 0.080 0.108 0.020 0.015 00665 PHOS-TOT MG/L P 0.260 0.055 0.025 0.060 0.080 0.180 0.210 0.170 0.320 0.500 0.040 0.050 50051 50053 FLOW CONDUIT RATE FLOW-MOD INST MGD MONTHLY ------- STORET RETRIEVAL DATE 76/01/27 1902B1 41 49 40.0 093 46 20.0 LITTLE CREEK 19 7.5 GRANGER T/8IG CREEK RESERVOIR LGHT OTY RD BRUG 4.5 MI SE OF MADRID 11EPALES 2111204 4 0000 FEET DEPTH DATE FROM TO 74/08/17 74/09/24 74/10/24 74/11/23 74/12/23 75/01/27 75/02/20 75/04/28 75/05/10 75/05/19 75/05/31 75/06/20 75/07/18 75/07/31 00630 00625 TIME DEPTH N02&N03 TOT KJEL OF N-TOTAL N DAY FEET 14 15 12 14 10 15 15 11 19 10 17 09 09 10 33 15 45 20 45 10 10 20 30 35 05 40 50 20 MG/L 3.800 0.024 0.008 5.680 7.130 6.900 6.300 9.200 11.000 10.500 12.600 10.500 12.000 6.000 MG/L 1. 1. 1. 0. 0. 1. 1. 000 900 000 900 600 300 300 4.500 0. 1. 1. 1. 0. 1. 925 400 600 850 750 100 00610 00671 00665 NH3-N PHOS-DIS PHOS-TOT TOTAL ORTHO MG/L 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 075 025 030 050 060 400 352 103 050 025 050 030 030 065 MG/L 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. P 055 030 050 210 100 180 184 133 080 030 085 115 055 025 MG/L P 0 0 0 0 0 0 0 1 0 0 0 0 0 0 .155 .210 .115 .290 .150 .230 .230 .50® .140 .170 .290 .440 .100 .110 ------- STORET RETRIEVAL DATE 76/01/27 1902C1 41 47 10.0 093 43 15.0 BIG CREEK 19153 15 SLATER 0/BIG CREEK RESERVOIR 20 FT BELOW BIG CREEK DAM SPILLWAY 11EPALES 2111204 4 0000 FEET DEPTH DATE FROM TO 74/08/17 74/09/24 74/11/23 74/12/23 75/01/27 75/02/20 75/04/28 75/05/10 75/05/19 75/05/31 75/06/20 75/07/18 75/07/31 TIME DEPTH OF DAY FEET 16 00 14 55 14 15 11 20 15 40 15 50 11 50 19 50 11 10 17 30 11 20 10 25 11 00 00630 N02&N03 N-TOTAL MG/L 6.200 0.439 3.830 4.270 3.800 3.900 4.900 5.400 5.200 5.200 6.900 7.600 4.950 00625 TOT KJEL N MG/L 0.800 1.800 0.700 0.500 0.800 0.900 0.750 0.900 1.750 1.100 1.100 0.900 1.300 00610 NH3-N TOTAL MG/L 0.060 0.162 0.128 0.070 0.088 0.056 0.025 0.020 0.045 0.060 0.135 0.090 0.250 00671 PHOS-DIS ORTHO MG/L P 0.015 0.020 0.010 0.020 0.015 0.024 0.025 0.005 0.010 0.015 0.030 0.005 0.005 00665 PHOS-TOT MG/L P 0.035 0.120 0.030 0.020 0.030 0.050 0.160 0.020 0.150 0.070 0.115 0.030 0.070 ------- |