Records of the Office of Research comprise correspondence and other records of Hugh H. Bennett, 1926-34 (including his correspondence as Director of the Soil Erosion and Moisture Conservation Investigations in the Bureau of Chemistry and Soils, 1928-34).

Records of divisions specialized functions include general records of the Hydrologic Division, consisting chiefly of correspondence, work plans, and weekly reports, 1935-40, and correspondence with hydrologic laboratories, 1935-42.

Classified files of the Hillculture Division, concerning prevention of erosion in hilly country and including meteorological charts for New Philadelphia and Zanesville, Ohio.

PI #195 (Cartographic Records), compiled by William J. Heynen (Washington: 1981).

Cartographic records, 1915-69 (212,692 items), include manuscript and published maps of the United States and its regions and States compiled by SCS and its predecessors, showing climatic patterns; water resources and stream flows; lake and reservoir sedimentations; geological formations; soil types and erosions; the distribution of natural vegetation and cultivated crops; potential and existing land uses; and the location, extent, and status of projects established to control floods, improve drainage and irrigation, conduct land use experiments, develop recreational facilities, and conserve soils, forests, and game.

Records of the Washington Office
Records of the Office of Research and Predecessor Units, 1903-50

The Office of Research, called Division of Research from 1935 to 1939, was one of two major offices created within the SCS when the agency was established (the second was the Office of Operations). The Office of Research's function was to obtain, through scientific research in the field and in the laboratory, more knowledge about soil erosion and its relationship to climate, water flow, sediment formation, landscape geomorphology, and agricultural practices; also to develop methods of control. The findings were reported to the SCS Office of Operations for application to the land. The Office of Research administered erosion experiment stations (later part of the Conservation Experiment Stations Division) and the Climatic and Physiographic, Hydrologic, Sedimentation, Hillculture, and Conservation Economics Divisions. The new Farm Drainage and Farm Irrigation Divisions were added in 1939. After 1041, the Hydrologic, Sedimentation, and Farm Drainage Divisions were consolidated into the Water Conservation and Disposal Practices Division; and the Climatic and Physiographic, Hillculture, Conservation Economics, and Conservation Experiment Stations Divisions were grouped together to form the Erosion Control Practices Division. The Farm Irrigation Division remained as a separate unit with headquarters at Logan, Utah. A cutback in research funds in 1948 and 1949 forced the termination of many research projects. In 1953 the remaining research functions were transferred from the SCS to the Agricultural Research Service, and the Office of Research was abolished. Afterward, the SCS conducted limited Research pertaining to soil survey maps only.


32. MAPS RELATING TO CLIMATE AND VEGETATION. Ca. 1936-41. 3 items. Maps (8 by 10 1/2 in.) of the United States, relating to climatic regions based on C.W. Thornthwaite's system of classification; plant growth regions as compiled by F.L. Mulford of the Bureau of Plant Industry; and "life zones" copied from an 1898 map by C. Hart Merriam of the Biological Survey. A larger scale climate and plant-growth region map by Thornthwaite and Mulford is described in entry 39.

Climatic and Physiographic Division

The Climatic and Physiographic Division was established in 1935. Scientific Research was aimed at discovering the interaction of climate and erosion, the stages of natural and culturally induced erosion, and the characteristics of erosional landforms. Climatic studies, employing existing Weather Bureau records as well as original field observations, were concerned with drought and wind erosion, the long-term aspects of rainfall, and the short-term problems of rainfall intensity and storm patterns. Thornthwaite used a climatic classification system he had developed in the early 1930's, based on "effective precipitation," or the amount of moisture available for plant use after some rainfall had evaporated into the atmosphere and some had run to the sea. From his numerical indexes of "precipitation-effectiveness" (P-E), Thornthwaite plotted climatic regions of the United States, ranging from superhumid in the east to arid in the west and corresponding to natural vegetation regions ranging from rain forest to desert. Descriptions of his work were published in Climate and Man, the 1941 Yearbook of the Department of Agriculture, and Atlas of Climatic Types in the United States, 1900-1939, Department of Agriculture Miscellaneous Publication No. 421, 1941., Yearbook of the Department of Agriculture, and Atlas of Climatic Types in the United States, 1900-1939, Department of Agriculture Miscellaneous Publication No. 421, 1941. The physiographic or geomorphologic studies that were undertaken in conjunction with climatic studies involved describing, mapping, and interpreting erosional landforms that develop under different types of climate and land use. In order to obtain meteorological data from a network of weather stations within a relatively small area, to determine local variability of rainfall, and to interpret the effect of rainfall on erosion and agriculture, a microclimatic study was undertaken in October 1935. Called the Kingfisher microclimatic project, the study took place in west-central Oklahoma in Kingfisher, Blaine, and Logan Counties. About 200 weather stations were established, with observers whose names were drawn from relief rolls and who performed the work on their own farms. Observations were taken hourly and sometimes, during storms, at 15-minute intervals. These findings were plotted on maps, sometimes more than 80 per day. Local physical, agricultural, and historical patterns of landscape were also mapped for comparison with weather maps. Operations were closed in the middle of 1937. A new and larger microclimatic project was established in 1937 in the Muskingum River watershed, constituting a large area in Eastern Ohio. New Philadelphia was established as a field office, and additional records were kept at the agricultural experiment station at Wooster. This watershed was selected partly because of the hydrologic studies already being conducted jointly by the Muskingum Watershed Conservancy District and members of the SCS Hydrologic Division at the Coshocton Experimental Watershed and the Zanesville Experiment Farm. With the help of the Works Progress Administration (WPA), weather observation data were collected from 500 stations located in the 8,000 square mile watershed. The resulting maps produced at the Muskingum watershed and Kingfisher microclimatic projects were to be used to interpret daily rainfall intensity, frequency, and local distribution - variables not shown by traditional weather measurements. Researchers at the Climatic Research Center in Ohio also compiled a series of precipitation maps of the Enoree River Basin in South Carolina as part of the Division's studies of the Piedmont. During world War II the Climatic and Physiographic Division was abolished, although records indicate that its activity was continued by the Climatic and Geographic Section of the newly formed Erosion Control Practices Division. A manuscript history of the Climatic and Physiographic Division and a list of its publications, arranged by author, was compiled by Guy Steward in 1951 and is available at the National Archives.

General Records


36. MAP RECORDS OF DIVISION DIRECTOR C. WARREN THORNTHWAITE. 1932-42. 19 items. Arranged in folders by subject. Maps, worksheets, atlases, and a geographical study created or accumulated by Thornthwaite both before and after he became Division director in 1935. Included are the following: copies of the Atlas of Climatic Types in the United States, 1900-1939 (U.S. Department of Agriculture, 1941), and the Atlas of Climatic Charts of the Oceans (U.S. Weather Bureau, 1938).

Climatic Section

39. GENERAL MAPS RELATING TO CLIMATE AND VEGETATION. Ca. 1933-42. 17 items. Unarranged. Maps prepared or published by Thornthwaite, including "Climates of the Earth," "Climate of the United States," and "Climatic Provinces and Plant Growth Regions of the United States" (with F.L. Mulford of the Bureau of Plant Industry); two photocopies of world maps of Vernon C. Finch, showing distribution of climatic and natural vegetation regions; untitled manuscript maps showing distribution of vegetation regions; blueprints and worksheets showing distribution of Thornthwaite's precipitation - and temperature - effectiveness regions; and manuscript and photoprocessed maps showing the location of Weather Bureau stations and "climatological section," each identified by numbers.

40. PLOTTING SHEETS FROM CLIMATIC STUDIES. Ca. 1939-42. Approx. 1,500 items. Arranged in folders by subject.


93 items. Arranged by plate number.








49. MAPS RELATING TO DROUGHT IN THE GREAT PLAINS. Ca. 1937-41. 56 items. Unarranged.


51. MAPS RELATING TO CLIMATE IN CALIFORNIA. n.d. 14 items. Unarranged.



Physiographic Section

54. RECORDS OF THE POLACCA WASH GEOMORPHOLOGIC STUDY, ARIZ. ca. 1934-41. Approx. 220 items. Arranged in folders by subject. Geomorphologic studies of the Polacca Wash, a 100-mile stream valley located within the Navajo-Hopi Indian Reservation of northeastern Arizona, begun by the Soil Erosion Service in 1934 under the guidance of geographer Carl O. Sauer of the University of California. The Polacca Wash was considered typical of Arroyo (gully) cutting, a characteristic of erosion problems of the Southwest. During the summers of 1934 and 1935, a reconnaissance survey was made. Beginning the following year, specific studies were conducted by the SCS to date the erosion, relate it to climatic conditions, determine its rate, and distinguish between natural and culturally induced erosion. The cartographic records include climatic maps, maps by Earl F. Dosch relating to rainfall stations in Keems Canyon; a series of unidentified historical maps by F.A. Johnson; graphs relating to rainfall and runoff; and maps prepared by the WPA, showing precipitation in the Southwest on certain days in 1908, 1915, 1934, and 1939.

Special Studies, Oklahoma

57. MAPS RELATING TO OKLAHOMA GEOGRAPHY AND HISTORY. ca. 1932-36. 69 items. Manuscript and published maps and worksheets relating to physical features, climate, etc. Arranged numerically by assigned number from 1 to 69. A list (in Appendix F) includes the following entries: 20) Climatic Regions according to Thornthwaite's system (rainfall and growing season isolines added in color); 21) Climatic regions according to Thornthwaite's system; 22) Duplicate of No. 21, printed.

62. MAPS RELATING TO ANNUAL CLIMATIC REGION CHANGES, 1911-30. n.d. 20 items. Arranged chronologically. Manuscript maps of Oklahoma, relating to annual changes in climatic region boundaries within the State, based on Thornthwaite's classification.


67. MAP FILE OF C.F. DOHM, KINGFISHER MICROCLIMATIC PROJECT, OKLA., 1935-37. 104 items. Arranged by assigned map number as shown in Appendix G. Entries include: 17) Routes of inspectors of weather stations (corrected to Dec. 5, 1936).

69. MAPS OF BLAINE AND KINGFISHER COUNTIES. 1936. 4 items. Three published maps of Kingfisher County, n.d., annotated in colors to show locations of weather stations of the climatic research center.

70. WEATHER STATION INDEX MAPS. 1936 and 1937. 4 items. Manuscript maps of the Kingfisher microclimatic project, showing locations of weather stations on two undated maps and on two maps dated April 10, 1936, and April 1, 1937.

71. WEATHER OBSERVATION MAPS OF THE KINGFISHER MICROCLIMATIC PROJECT, OKLA., 1936 and 1937. Approx. 33,000 items. Fastened in 85 loose-leaf notebooks and arranged by subject as shown in Appendix H. Entries include:

1. Cloud maps. Apr. 1936-May 1937, 5,500 items. 13 vols.
2. Dust maps. Nov. 1936-May 1937. 800 items. 1 vol.
3. Fog maps. Dec. 1936-Mar. 1937. 1,300 items. 4 vols.
4. Relative humidity maps. Apr. 1936-May 1937. 4,000 items. 9 vols. One volume marked "incomplete".
5. Actual precipitation maps (15- and 30-min. intervals). Mar.-Aug. and Nov.-Dec. 1936; and Apr.-May 1937. 3,000 items. 8 vols. and 12 loose monthly summary maps.
6. Accumulated precipitation maps (daily, accumulated at 15-min., and 1-hour intervals). Apr.-May 1937. 850 items. 2 vols.
8. Accumulated precipitation maps (daily, monthly, and annual). Nov. 1936-Mar. 1937. 700 items. 3 vols.
9. Accumulated, crop series precipitation maps for winter months. Sept. 1936-May 1937. 150 items. 1 vol.
10. Accumulated precipitation maps (1/4, 1/2, 3/4, and 1 in. or more).
N. d. 27 items. 1 vol.
11. Special maps on precipitation frequency for winter months, and graphs of maximum and minimum precipitation for 1936.
18 items (loose).
12. Hourly temperature maps. Apr. 1936-May 1937.
5,500 items. 14 vols.
13. Intensified hourly temperature study maps. Apr. 1936.
400 items. 1 vol.
14. Maximum temperature maps. Apr.-Dec. 1936.
250 items. 1 vol.
15. Minimum temperature maps. Oct. 1936-Mar. 1937.
450 items. 2 vols.
16. Maximum and minimum temperature maps. May 1936.
400 items. 1 vol.
17. Temperature change (isallotherm) maps. Apr.-June 1936.
850 items. 1 vol.
18. Wind direction and velocity maps. Apr. 1936-May 1937.
5,600 items. 13 vols.
19. Special maps showing various climatic data for certain days in 1936 and 1937. 100 items. 1 vol.

72. MAPS PREPARED AS ILLUSTRATIONS FOR "A LIFE HISTORY OF A RAINSTORM" AND OTHER ARTICLES, 1936 and 1937. 32 items. Unarranged. A series of large manuscript composite maps of the Kingfisher microclimatic project, showing hourly weather conditions on certain days in 1936; other maps include those relating to storm migrations, the passage of polar fronts, and the location of meteorological observers. Some of these maps were prepared in connection with Thornthwaite's "A Life History of a Rainstorm: Progress Report from the Oklahoma Climatic Research Center" (Geographic Review, Vol. 27, No. 1, Jan. 1937), and Leonard B. Corwin's "Sampling the Weather at the Oklahoma Climatic Research Center" (Soil Conservation, U.S. Department of Agriculture, Vol. II, No. 10, Apr. 1937).

73. RAINFALL MAPS OF THE GUTHRIE EXPERIMENTAL FARM. 1937. 340 items. Fastened in two loose-leaf notebooks and thereunder arranged chronologically. A series of small (9 by 11 in.) manuscript maps showing actual and accumulated precipitation at 30-minute intervals from March to June 1937. The Guthrie Experiment Farm, Okla., was used in connection with the Kingfisher microclimatic project.

74. OKLAHOMA "AIRWAYS" WEATHER MAPS. 1936 and 1937. 1,300 items. Arranged in folder chronologically. Small (8 1/2 by 11 in.) manuscript outline maps of the States surrounding Oklahoma, using symbols to show weather conditions at 6-hour intervals. These maps were compiled to sample the large, general storms extending beyond the limits of the Kingfisher microclimatic project area. The location of the project is indicated on each map.

78. WEATHER STATION INDEX MAPS AND RELATED TOPOGRAPHIC QUADRANGLES. 1937-42. Approx. 700 items. Arranged by subject and thereunder generally chronologically. The records include approximately 500 base maps of the watershed, annotated to show locations of weather stations weekly or for other time periods.

79. WEATHER OBSERVATION MAPS OF THE MISKINGUM WATERSHED MICROCLIMATIC PROJECT, OHIO. 1937-42. Approx. 82,000 items. Fastened into 229 loose-leaf notebooks, plus loose sheets, and arranged by subject as shown in Appendix J. Entries include:

1. Cloud maps, June 1937-July 1938. 5,500 items. 14 vols.

2. Humidity maps, 1937 and 1938; Relative humidity for Sept. 12, 1938; specific humidity for Oct. 1-31, 1937, and May 24, 1938, 800 items, 3 vols.

3. Actual precipitation maps: (30-minute intervals), June 1937-June 1939, 14,000 items, 24 vols; (30-minute intervals), printed at reduced size, 9 by 14 inches, July 1937-May 1939, 11,700 items, 24 vols; (4-hour intervals), June 1937-Oct. 1942, 36,000 items, 9 vols; (12-hour intervals), June 1937-Mar. 1939, and Jan. 1940-Dec. 1942, 1,700 items, 6 vols; (24-hour intervals), June 1937-Mar. 1939, Jan. 1940-Oct. 1942, and Dec. 21-22 and 30-31, 1942, with a separate volume for July and Aug. 1942, 1,100 items, 6 vols; (various intervals), July 15-18, Aug. 9-10, and Nov. 12-13, 1937, and Sept. 12, 1938, 70 items, 1 vol. and loose sheets.

9. Accumulated precipitation maps: (30-min. intervals), June 9-15, July, and Aug. 1937, 950 items, 3 vols.; (4-hour intervals), June 1937-Oct. 1942, 3,800 items, 6 vols.; (Storms of Aug. 1, 6, and 8, 1937), 320 items, 1 vol.

12. Precipitation storms: (maximum 12-hour precipitation), July 1937-June 1939. Maps of 50 storms, paired for comparison by month. 50 items. 1 vol.

13. Accumulated precipitation maps: (24-hour intervals), July 1937-Sept. 1941, 1,000 items, 4 vols.; (Monthly accumulated precipitation maps, special series), July 1937-Sept. 1941, 1,000 items, 4 vols.; (Annual accumulated precipitation maps, special series), July 1937-Sept. 1941, 500 items, 2 vols.

16. Daily and monthly summaries (special series), 1939-42, 75 items, 1 vol.

17. 30-minute interval precipitation for Dec. 3, 1938 (special maps), 20 items, 1 vol.

18. Precipitation by stations, Sept. 3-5, 1937, 4 items, 1 vol.

19. Accumulated precipitation (24-hour intervals), printed at reduced size, 8 by 11 inches, Jan. 1937-Oct. 1941, 800 items, 50 small vols., some grouped together into larger volumes.

20. Temperature maps, Aug. 1937-Feb. 1940 with gaps, 12,000 items, 30 vols.

21. Wet bulb temperature maps on hourly basis, Oct. 1937, 400 items, 1 vol.

22. Wind direction and velocity maps, Oct. 1937-July 1938, 22,000 items, 35 vols.

23. Special experimental volumes containing several different types of maps for each day, July 14-15, Oct. 9, and Oct. 12-13, 1937, 550 items, 2 vols.

80. HISTORICAL PRECIPITATION MAPS. 1900-36. 1937-42. 10,600 items. Fastened in 38 loose-leaf notebooks and arranged chronologically. A series of small (8 by 11 in.) maps showing daily precipitation figures for the Muskingum watershed microclimatic project from January 1900 to December 1936, compiled from Weather Bureau records. Some daily maps are missing. Volume 38 contains monthly summary maps for the years 1903 through 1936.

81. WEATHER OBSERVATION MAPS FROM SELECTED STUDIES OF MINOR WATERSHEDS AND PROJECT AREAS. 1937-40. Approx. 24,000 items. Fastened in 175 loose-leaf notebooks and arranged alphabetically by name or by subwatershed or by project, as listed below, and thereunder generally chronologically. Small (8 by 11 in.) manuscript maps of the Muskingum River Watershed, showing recorded precipitation figures at intervals of 30 minutes, 12 hours, or 24 hours. Included are maps of the north Appalachian Experimental Watershed at Coshocton, 1938 (1,900 maps in 11 vols.); the Little Mill Creek drainage area, 1938 and 1939 (1,800 maps in 9 vols.); the Senecaville project, 1937-39 (5,700 maps in 23 vols.); the upper Licking Creek watershed, 1937-40 (5,500 maps in 62 vols.); the upper Wills Creek watershed, 1937-40 (4,300 maps in 47 vols.); and the Zanesville Experiment Farm, 1938-40 (5,200 maps in 23 vols). The upper Licking Creek notebooks also contain maps relating to runoff, hourly temperatures, and dry bulb temperatures.

82. MISCELLANEOUS MAPS AND GRAPHS RELATING TO UPPER LICKING CREEK SUBWATERSHED. Ca. 1937-41. 18 items. Unarranged. Included are undated maps of the subwatershed, summarizing areas of rainfall, field moisture deficiency, ground water accretion, and runoff on September 4 and 5, 1937, and hydrographs relating to runoffs.

83. PRECIPITATION MAPS OF THE UPPER OHIO AND SUSQUEHANNA DRAINAGE BASIN. 1938 and 1939. Approx. 7,100 items. Fastened in 18 loose-leaf notebooks and arranged by subject as noted below. Within the notebooks the maps are in chronological order. Maps were compiled to gather information for the study of rainfall morphology, conditions that produce rain, and the amount of precipitation available for runoff and crop production. Precipitation data were partially supplied to the Muskingum Climatic Research Center at New Philadelphia, Ohio, by other organizations and agencies, such as the Pennsylvania Power and Light Co., the U.S. Army Corps of Engineers, and the U.S. Weather Bureau. The maps are in two groups: (1) 6 large notebooks of precipitation maps at 24-hour intervals for 1938, precipitation maps at 6-hour intervals for the period January-June 1938, and precipitation maps for selected days in 1938 and 1939; and (2) 12 small (9 by 13 in.) notebooks of hourly precipitation maps for 1938.

84. "STORM PATTERN MAPS AS PRODUCES BY DIFFERENT RAIN GAGE SPACINGS." n.d. 33 items. Fastened in a loose-leaf notebook and arranged by area. Manuscript maps relating to the Susquehanna and upper Ohio River watershed the Muskingum River watershed, the Senecaville project, and the Zanesville Experiment Farm.

85. OHIO AIRWAYS WEATHER MAPS. 1937-39. Approx. 1,700 items. Arranged chronologically. Small (8 1/2 by 11 in.) manuscript outline maps covering the States adjacent to Ohio, showing weather conditions for each 6-hour interval by means of symbols. These maps were compiled to sample the large, general storms extending beyond the limits of the Muskingum watershed microclimatic project area. The location of the project area is shown on each map.

86. RAINFALL MAPS. 1939 and 1940. Approx. 3,000 items. Fastened in 30 loose-leaf notebooks and arranged chronologically. A series of small (9 by 11 in.) maps of the Enroee River Basin, showing precipitation at several weather stations within the watershed at 1-hour and 24-hour intervals. These maps, from a study of a microclimate within the southern Piedmont region, were prepared at the Muskingum Climatic Research Center at New Philadelphia, Ohio, where the major field studies of the Climatic and Physiographic Division were being conducted at the time.

Hydrologic Division

90. NUMBERED MAP FILE OF THE HYDROLOGIC DIVISION. 1925-41. 628 items. Arranged alphabetically by State, with additional categories for the southern Piedmont and Puerto Rico, and thereunder by assigned map number. The following items were found in Appendix K:

Colorado and High Plains Region

1a-1p. maps relating to selection of an experimental watershed (16 items). Fig. 3a., rainfall and drainage.


5-11. East and West Tarkio watersheds: graphs giving information for period 1934-36 (7 items). Ratio of surface runoff to rainfall by months, ratio of surface runoff to rainfall for storm period, relative silt losses for storm periods, peak values of stream flow for storm periods, and dry weather stream flows. Prepared in Sept. 1937.

12. East and West Tarkio watersheds. Graph relating to dry weather stream flows, 1934-37, n.d.

13a-13i. East and West Tarkio watersheds. Graphs giving information for period 1934-37 (9 items): Fig. 1, monthly precipitation.

Fig. 2, ratio of runoff to precipitation by months.

Fig. 3, silt losses by months.

Fig. 4, precipitation by storms.

Fig. 5, ration of runoff to precipitation by storm.

Fig. 6, silt losses by storms.

Fig. 7, silt concentrations for storm periods.

Fig. 8, peak flows during storms.

Fig. 9, composite of 1-8.

15. East and West Tarkio watersheds, recording and standard rain gauges. Scale 1:300,000. 1939.


5a-5c. Tarkio-Bethany project. Charts showing ratio of runoff to monthly rainfall, runoff, and ration of cumulative runoff to cumulative rainfall (3 items). 1934-36.

7. Bethany Experiment Station. Initial hydrographs for storm of Sept. 26, 1933 (un-terraced conditions). Experiment 58-A.

8. Bethany Experiment Station. Chart showing crop growth as related to rainfall, Aug. 1933.

New Mexico

3a-3n. Mexican Springs, storm of July 23, 1941. Sheets showing rain gauges, runoff measuring station, and watershed boundary (14 items). Scale 1:54,000.

4. Published topographic map of Mexican Springs Navajo Experiment Station, annotated to show drainage areas, types of rain gauges, and water table wells. Scale 1:24,000. Ca. 1941.

5a-5e. Mexican Springs, storms of Aug. 30, 1937; Aug. 11 and Sept. 10, 1938; and July 28 and December 1939 (5 items). Scale 1:24,000.

10. Reduced topographic map of Mexican Springs Navajo Experiment Station, showing location of recording rain gauge stations. Scale ca. 1:54,000. Dec. 1940.

14. Mexican Springs area map showing rain gauges. Scale: 1,24,000. Sept. 1940.

Ohio: Coshocton Experimental Watershed (Little Mill Creek), Project 1

26a-26l. Ground water graphs, 1936 and 1937 (12 items).

27. Graph showing cumulative precipitation by storms, Little Mill Creek. June 1937. Ohio: Zanesville Experiment Farm.

Ohio: Zanesville Experiment Farm

3. Zanesville Experiment farm map showing location of recording gauges. Scale 1:1,400. Apr.. 1938.

10. Map of the Northwest Appalachian Soil and Water Conservation Experiment Station, Zanesville, annotated to show locations of recording rain gauges and standard rain gauges. n.d.


3. Graph showing storm data correlations, Stillwater project, 1934-37.

4-5. Council Creek watershed graphs relating to stream flow time, half hourly rainfall, 1935-37 (3 items).

6-9. Brush Creek, Stillwater project, graphs relating to stream flow time, half hourly rainfall, and discharge of surface flow time, 1935-37 (4 items).

16. Aerial photograph of the station at Guthrie. n.d.

18. Table of runoff in percentage of rainfall at the station in Guthrie, 1932-34.

19a-19e. Charts and graphs relating to rainfall and runoff in various plots, 1932-34 (5 items).

Texas: Brushy Creek (Blackland) Experimental Watershed (McLennan and Falls Counties)

29. Map of watershed showing meteorological installations. Scale 1 inch to approx. 2,000 feet. Jan. 1937.

Texas: Brazos River Conservation and Reclamation District

3-6. Maps by State Board of Water Engineers, Austin, showing locations of stream gauging stations, evaporation stations, rainfall stations, and silt sampling stations (4 items). Scales vary. n.d.

Texas: Tyler Soil Erosion Experiment Far, Smith County

3. Table relating to runoff as a percentage of rainfall at the Tyler Experiment Farm, 1932-34.


1-4. Base maps of Coon creek (SCS Demonstration Project Wis., and adjacent Little La Crosse River showing stream gauging stations, rain gauges, drainage, and towns (4 items). Scales vary. 1934.

91. GRAPHS AND TABLES FROM RAINFALL AND RUNOFF STUDIES AT CERTAIN EXPERIMENT STATIONS (COMPILED DATA). 1927-42. 1,920 items. Arranged in folders alphabetically by name of experiment station and thereunder chronologically.

92. ENGINEERING DRAWINGS OF EQUIPMENT. 1935-38. 173 items. The records consist of blueline and blueprint drawings of equipment designed or used by the Hydrologic Division on various experiment stations and projects. Under the heading marked "instruments and equipment" are such items as a soil sampling tube, a rain gauge, an evaporimeter, a recording tipping bucket, a magnetic clutch, a synchronizer, receiving tanks, runoff gutters, a snow sampler, and an infiltrometer.

93. GRAPHS AND DRAWINGS FROM "MEASURING FLUME" STUDIES AT THE NATIONAL HYDRAULIC LABORATORY, THE NATIONAL BUREAU OF STANDARDS. 1936-38. 16 items. Unarranged. Rough graphs and construction drawings compiled during studies of flumes A through H (G is omitted). During fiscal year 1938, responsibility for flume studies, previously held by the National Bureau of Standards, was transferred to the Hydrologic Division's Section of Hydraulic Laboratory Studies.

186. MAP OF THE PEE DEE WATERSHED, S.C. AND N.C. Ca. 1940. 1 item. Photoprocessed flood control base map annotated to show locations of existing and proposed SCS and Weather Bureau rainfall gauges.

Records of Regional Offices. Southwestern Regional Office, Albuquerque, N. Mex. (Region 8, 1936-42; Region 6, 1942-53).

249. ADMINISTRATIVE MAPS. 1936-50. 9 items. Arranged chronologically. Photoprocessed, manuscript, annotated, and published maps of the entire southwestern region, relating to (1) precipitation, 1936; (5) rainfall intensity characteristics over a 50-year period, 1950 (3 maps).

251. CLIMATIC MAPS AND GRAPHS OF THE SOUTHWEST. 1940 and 1941. Approx. 214 items. The maps are unarranged. The graphs are arranged chronologically. Included are a series of 14 worksheets and finished maps in color showing climatic provinces in Utah, Arizona, western Colorado, the Colorado River watershed, the Rio Grande-Colorado River watershed in Colorado, and the Great Basin in Utah; and a series of approximately 200 monthly graphs showing the statistical relationship between elevation, temperature, and precipitation in eastern Arizona, western Arizona, southern New Mexico, northern New Mexico, the Colorado River watershed in Utah, and the Rio Grande-Colorado River watershed in Colorado.

252. MAPS OF STATES WITHIN THE REGION THAT ACCOMPANIED A REPORT ON PRECIPITATION, WATER YIELDS, AND SEDIMENT. 1951-53. 12 items. Arranged by map numbers 1 to 12. Maps of Arizona, Colorado, New Mexico, and Utah, published as illustrations to accompany an unidentified report prepared by the southwestern regional office. Separate maps for each State relate to average annual precipitation, average annual water yields, and sources of water-transported sediment.

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