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Data Series 1062

Prepared in cooperation with the Reservoir Fisheries Habitat Partnership

A Reservoir Morphology Database for the Conterminous United States

By Kirk D. Rodgers

Appendix I

The appendix contains metrics for each of the datasets used in the compilation of the Reservoir Morphology Database (RMD) and a definition of each. Numbers in parentheses indicate original data source or reference. In the database, the symbol “—“ indicates data are not available.

  1. Dam_name—The official name of the dam or impoundment. No abbreviations used unless a part of the official name. Popular name used when the dam does not have official name (1).
  2. Other_dam_name—Previous name of the dam. Name which is used commonly other than the official name (1).
  3. State—State in which the dam and reservoir are located according to the NID (1).
  4. NIDID—Unique identification number issued by the U.S. Army Corps of Engineers. Formerly known as the National ID (1).
  5. Year_Completed— Year construction was completed on dam (1).
  6. Reservoir_Age— The year 2015 minus the year construction was completed.
  7. Hydraulic_Height (feet)—The vertical difference between the maximum design water level and the lowest point in the original streambed (1).
  8. NID_Height (feet)—A calculated value based on dam height, structural height, and hydraulic height that provides a single value to facilitate database queries (1).
  9. Maximum_Discharge (cubic feet/second)—Maximum discharge from the reservoir that the spillway can accommodate (1).
  10. Maximum_Storage (acre-feet)—The total storage space in a reservoir below the maximum attainable water surface elevation (1).
  11. Normal_Storage (acre-feet)—The total storage space in a reservoir below the normal retention level, including dead and inactive storage and excluding any flood control or surface storage (1).
  12. NID_Storage (acre-feet)—Volume calculated by the NID based on the maximum storage and normal storage that provides a single storage value to facilitate database queries (1).
  13. NID_Storage (cubic feet)—Volume calculated by the NID based on the maximum storage and normal storage that provides a single storage value multiplied by 43,560 (1).
  14. Surface_Area (acres)—The number of acres covered by the surface of the reservoir at its normal retention level (1).
  15. Surface_Area (square feet)—The number of acres covered by the surface of the reservoir at its normal retention level multiplied by 43,560 (8).
  16. Surface_Area (square miles)—The number of acres covered by the surface of the reservoir at its normal retention level, which is equal to acre—feet multiplied by 0.0015625 (8).
  17. Surface_Area (square meters)—The number of acres covered by the surface of the reservoir at its normal retention level multiplied by 4046.86 (8).
  18. Surface_Area (square kilometers)—The number of acres covered by the surface of the reservoir at its normal retention level multiplied by 0.00404686 (8).
  19. Drainage_Area (square miles)—The area of land where all the water which drains from it or beneath it collects in the same place (1).
  20. Drainage_Area (square kilometers)—The area of land where all the water which drains from it or beneath it collects in the same place (8).
  21. Drainage_Area (acres)—The area of land where all the water which drains from it or beneath it collects in the same place (8).
  22. Drainage_Area (square feet)—The area of land where all the water which drains from it or beneath it collects in the same place (8).
  23. Reservoir_Perimeter (feet)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (4).
  24. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  25. Reservoir_Perimeter (miles)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  26. Shoreline_Development_Index—Unitless number calculated by dividing the shoreline distance by the perimeter of a circle of the same area as the lake. (DL) = SL / 2* (π*A0) where SL is the reservoir perimeter and A0 is the area of the lake (2).
  27. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  28. Mean_Depth (Zmean)—Volume divided by the surface area. Zmean = V/A0 where V is the volume of the reservoir at normal storage and A0 is the area of the reservoir (2).
  29. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  30. Index_of_Basin_Permanence (IBP)—A morphometric index that is a reflection of the littoral effect on basin volume. IBP = V/SL where V is the volume of the reservoir at normal storage and SL is the length of the reservoir perimeter (11).
  31. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  32. Development_of_Volume (Dv)—A measure of the departure of the shape of the lake basin from that of a cone. (Dv)= 3*Zmean/Zmax where Zmean is the mean depth of the reservoir and Zmax is the maximum depth of the reservoir as hydraulic height (2).
  33. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  34. Maximum_Depth (Zmax)—In feet as hydraulic height (1).
  35. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  36. Mean_Depth_Maximum_Depth_Ratio (Depth Ratio)—As depth ratio decreases, potential nutrient recycling from the sediment surface, productivity, and sediment accretion rate increases (6).
  37. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  38. Mean_Q (cubic feet/second)—Average amount of water passing a given point per unit of time (7).
  39. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  40. Catchment_Area_Surface_Area_Ratio—Calculated as drainage area divided by surface area of the reservoir (10).
  41. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  42. Relative_Depth (Zr)—The maximum depth as a percentage of mean diameter. Zr = 50 * Zmax * (π)*((A0) (3).
  43. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  44. Surface_Area_Lake_Volume_Ratio—Calculated as surface area divided by the reservoir volume at normal storage (9).
  45. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  46. Lake_Volume (cubic feet) (8).
  47. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  48. Lake_Volume (cubic meters) (8).
  49. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  50. Lake_Volume (106 cubic meters) (8).
  51. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  52. AreaSqKm—Area of an areal feature based on Albers Equal Area conic (4).
  53. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  54. Elevation (meters)—Vertical distance from a given datum (4).
  55. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  56. GNIS_Name—U.S. Board on Geographic Names Identification System feature name by which a particular geographic feature is known (4).
  57. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  58. ReachCode—Unique identifier for a 'reach'. The first eight numbers are the WBD_HUC8. The next six numbers are randomly assigned, sequential numbers that are unique within a HUC 14-character value (4).
  59. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  60. E2RF1 —A secondary unique reach identification number that reflects revisions in process steps (5).
  61. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  62. HUC—Hydrologic Cataloging unit of the reach (5).
  63. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  64. MEANV(feet per second)—Velocity corresponding to mean streamflow for reach (5).
  65. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  66. STRAHLER—Strahler stream order of the reach (5).
  67. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  68. RR—"River Reach" identifier. An 11-digit identification number consisting of an 8-digit hydrologic unit code and 3-digit reach segment number (5).
  69. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  70. REACH—Unique five-digit ERF1_2 reach identifying code (7).
  71. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  72. NUTCODE—The U.S. Environmental Protection Agency "nutrient criteria" region codes for 14 regions for the conterminous United States (7).
  73. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  74. PSEWER—The percentage of the total population on public sewage systems from the 1990 U.S. Bureau of Census estimated for the total drainage area above the reach as defined by DEMTAREA (7).
  75. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  76. PSEPTIC—The percentage of the total population on septic systems from the 1990 U.S. Bureau of Census estimated for the total drainage area above the reach as defined by DEMTAREA (7).
  77. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  78. POTHER—The percentage of the total population on disposal systems other that public sewage or septic from the 1990 U. S Bureau of Census estimated for the total drainage area above the reach as defined by DEMTAREA (7).
  79. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  80. WATER—Percentage of total drainage area in water (1992 NLCD open water and perennial ice/snow land-use classes 11, 12) (7).
  81. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  82. WETLANDS—Percentage of total drainage area in wetlands (1992 NLCD woody and emergent herbaceous land-use classes 91, 92) (7).
  83. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  84. URBGRASS—Percentage of total drainage area in urban and recreational grasses (1992 NLCD land-use class 85) (7).
  85. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  86. LURBAN—Percentage of total drainage area in low-intensity residential land (1992 NLCD land-use class 21) (7).
  87. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  88. HURBAN—Percentage of total drainage area in high-intensity residential land (1992 land-use class 22) (7).
  89. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  90. COMM—Percentage of total drainage area in commercial/industrial/transportation land (1992 NLCD land-use class 23) (7).
  91. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  92. FORESTD—Percentage of total drainage area in deciduous forested land (1992 NLCD land-use class 41) (7).
  93. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  94. FORESTE—Percentage of total drainage area in evergreen forested land (1992 NLCD land-use class 43) (7).
  95. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  96. FORESTM—Percentage of total drainage area in mixed forested land (1992 NLCD land-use class 43) (7).
  97. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  98. SHRUB—Percentage of total drainage area in shrub land (1992 NLCD land-use class 51) (7).
  99. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  100. GRASS—Percentage of total drainage area in grass and herbaceous lands (1992 NLCD land-use class 71) (7).
  101. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  102. PASTURE—Percentage of total drainage area in pasture/hay land (1992 NLCD land-use class 81) (7).
  103. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  104. CROPS—Percentage of total drainage area in cultivated land, including row crops, small grains, and fallow land (1992 NLCD land-use classes 82, 83, 84) (7).
  105. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  106. ORCHARDS—Percentage of total drainage area in orchards, vineyards, other
  107. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  108. 1992 NLCD land-use class 61) (7).
  109. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  110. BARREN—Percentage of total drainage area in quarries and barren, transitional lands (1992 NLCD land-use classes 31, 32, 33) (7).
  111. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  112. TNLOADB—Natural background mean-annual total nitrogen load from the reach (kg/yr) (7).
  113. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  114. TPLOADB—Natural background mean-annual total phosphorus load from the reach (kg/yr) (7).
  115. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  116. TNYLDB—Natural background mean-annual total nitrogen yield for the total drainage area (kg/km2/yr) (7).
  117. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  118. TPYLDB—Natural background mean-annual total phosphorus yield for the total drainage area (kg/km2/yr) (7).
  119. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  120. TNCONCB—Flow-weighted natural background mean-annual total nitrogen concentration at the reach outlet (mg/L) (7).
  121. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  122. TPCONCB—Flow-weighted natural background mean-annual total phosphorus concentration at the reach outlet (mg/L) (7).
  123. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  124. TNLOADBW—Natural background mean-annual total nitrogen load from the reach (kg/yr): includes atmospheric deposition (7).
  125. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  126. TNYLDBW—Natural background mean-annual total nitrogen yield for the total drainage area (kg/km2/yr): includes atmospheric deposition (7).
  127. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  128. TNCONCBW—Natural background mean-annual total nitrogen concentration at the reach outlet (mg/L): includes atmospheric deposition (7).
  129. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  130. TNLOAD—Total nitrogen load (kg/yr) at the reach outlet for long-term mean-annual conditions (7).
  131. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  132. TPLOAD—Total phosphorus load (kg/yr) at the reach outlet for long-term mean—annual conditions (7).
  133. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  134. TNYLD—Total nitrogen yield (kg/km2/yr) for the total drainage area for long-term mean—annual conditions (7).
  135. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  136. TPYLD—Total phosphorus yield (kg/km2/yr) for the total drainage area for long-term mean-annual conditions (7).
  137. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  138. TNCONC—Flow-weighted total nitrogen concentration (mg/L) at the reach outlet for long-term mean-annual conditions (7).
  139. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  140. TPCONC—Flow-weighted total phosphorus concentration (mg/L) at the reach outlet for long-term mean-annual conditions (7).
  141. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  142. TNPOINT—Municipal and industrial wastewater contributions to the mean-annual total nitrogen load at the reach outlet (percentage of the mean-annual load) (7).
  143. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  144. TPPOINT—Municipal and industrial wastewater contributions to the mean-annual total phosphorus load at the reach outlet (percentage of the mean-annual load) (7).
  145. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  146. TNFERT—Fertilizer contributions to the mean-annual total nitrogen load at the reach outlet (percentage of the mean-annual load) (7).
  147. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  148. TPFERT—Fertilizer contributions to the mean-annual total phosphorus load at the reach outlet (percentage of the mean-annual load) (7).
  149. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  150. TNATMOS—Atmospheric deposition contributions to the mean-annual total nitrogen load at the reach outlet (percentage of the mean-annual load) (7).
  151. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  152. TNFOREST—Forested land nonpoint contributions to the mean-annual total nitrogen load at the reach outlet (percentage of the mean-annual load) (7).
  153. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  154. TPFOREST—Forested land nonpoint contributions to the mean-annual total phosphorus load at the reach outlet (percentage of the mean-annual load) (7).
  155. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  156. TNBARREN—Barren land nonpoint contributions to the mean—annual total nitrogen load at the reach outlet (percentage of the mean—annual load) (7).
  157. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  158. TPBARREN—Barren land nonpoint contributions to the mean—annual total phosphorus load at the reach outlet (percentage of the mean—annual load) (7).
  159. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  160. TNSHRUB—Shrub land nonpoint contributions to the mean—annual total nitrogen load at the reach outlet (percentage of the mean—annual load) (7).
  161. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  162. TPSHRUB—Shrub land nonpoint contributions to the mean—annual total phosphorus load at the reach outlet (percentage of the mean—annual load) (7).
  163. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  164. TNGRASS—Grass land nonpoint contributions to the mean—annual total nitrogen load at the reach outlet (percentage of the mean—annual load) (7).
  165. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  166. TPGRASS—Grass land nonpoint contributions to the mean—annual total phosphorus load at the reach outlet (percentage of the mean—annual load) (7).
  167. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  168. TNMAN—Animal agriculture contributions to the mean—annual total nitrogen load at the reach outlet (percentage of the mean—annual load) (7).
  169. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  170. TPMAN—Animal agriculture contributions to the mean—annual total phosphorus load at the reach outlet (percentage of the mean—annual load) (7).
  171. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  172. TNDFRAC—Fraction of the mean—annual total nitrogen load delivered to the downstream terminal reach (typically an estuary or inland waterbody) (7).
  173. Reservoir_Perimeter (kilometer)—Length of the reservoir shoreline calculated in ArcGIS from National Hydrography Dataset digitized from USGS Topographic Maps (8).
  174. TPDFRAC—Fraction of the mean—annual total phosphorus load delivered to the downstream terminal reach (typically an estuary or inland waterbody) (7).

Appendix References

(1) – U.S. Army Corps of Engineers, 1998.

(2) –Wetzel and Likens, 1991.

(3) – Hutchinson, 1957.

(4) – Simley and Carswell, 2009.

(5) – Nolan and others, 2002

(6) – Carpenter, 1983

(7) – Schwarz and others, 2006.

(8) – Values calculated from datasets (NID, NHD, ERF1_2, and SPARROW)

(9) – McJannet and others, 2008.

(10) – Noges, 2009.

(11) – Kerekes, 1977.

First posted September 13, 2017

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