Geology Reports⌕ Search

SEARCH · Geology Reports

Results for “Contribution”

Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 685 records · Page 38Linked to original sources
USGS1999

Ground-water occurrence and contribution to streamflow, northeast Maui, Hawaii

The study area lies on the northern flank of theEast Maui Volcano (Haleakala) and covers about129 square miles between the drainage basins ofMaliko Gulch to the west and Makapipi Stream tothe east. About 989 million gallons per day of rain-fall and 176 million gallons per day of fog dripreaches the study area and about 529million gal-lons per day enters the ground-water system asrecharge. Average annual ground-water with-drawal from wells totals only about 3 million gal-lons per day; proposed (as of 1998) additionalwithdrawals total about 18 million gallons per day.Additionally, tunnels and ditches of an extensiveirrigation network directly intercept at least 10 mil-lion gallons per day of ground water.The total amount of average annual stream-flow in gaged stream subbasins upstream of 1,300feet altitude is about 255 million gallons per dayand the total amount of average annual base flow isabout 62 million gallons per day. Six major sur-face-water diversion systems in the study area havediverted an average of 163 million gallons per dayof streamflow (including nearly all base flow ofdiverted streams) for irrigation and domestic sup-ply in central Maui during 1925–97.Fresh ground water is found in two mainforms. West of Keanae Valley, ground-water flowappears to be dominated by a variably saturatedsystem. A saturated zone in the uppermost rockunit, the Kula Volcanics, is separated from a fresh-water lens near sea level by an unsaturated zone inthe underlying Honomanu Basalt. East of KeanaeValley, the ground-water system appears to befully saturated above sea level to altitudes greaterthan 2,000 feet. The total average annual streamflow of gagedstreams west of Keanae Valley is about 140 milliongallons per day at 1,200 feet to 1,300 feet altitude.It is not possible to estimate the total averageannual streamflow at the coast. All of the base flowmeasured in the study area west of Keanae Valleyrepresents ground-water discharge from the high-elevation saturated zone. Total average dailyground-water discharge from the high-elevationsaturated zone upstream of 1,200 feet altitude isgreater than 38 million gallons per day, all of whichis eventually removed from the streams by surface-water diversion systems. Perennial streamflow hasbeen measured at altitudes greater than 3,000 feetin several of the streams. Discharge from the high-elevation saturated zone is persistent even duringperiods of little rainfall. The total average annual streamflow of the gaged streams east of Keanae Valley is about 109million gallons per day at about 1,300 feet altitude. It is not possible to estimate the total average annual streamflow at the coast nor at higher altitudes. All of the base flow measured east of Keanae Valley represents ground-water discharge from the vertically extensive freshwater-lens system. Total average daily ground-water discharge to gaged streams upstream of 1,200 feet altitude is about 27million gallons per day. About 19 million gallons per day of ground water discharges through the Kula and Hana Volcanics between about 500 feet and 1,300 feet altitude in the gaged stream sub-basins. About 13 million gallons per day of this discharge is in Hanawi Stream. The total ground-water discharge above 500 feet altitude in this part of the study area is greater than 56 million gallons per day.

Hawaii↗
USGS1972

Factors contributing to unusually low runoff during the period 1962-68 in the Concho River Basin, Texas

To determine the reasons for the unusually low runoff in the Concho River basin during the period 1962-68, the physical developments and climatic changes in the basin were identified and related to changes in the regimen of streamflow. Land use, brush infestation, and land-treatment practices have not caused significant changes in the rainfall-runoff relationship. The use of surface water for irrigation has increased very little during the past 70 years, and although the use of ground water for irrigation has greatly increased in the past 25 years, springflow has not been significantly diminished. The base flow of the streams is materially reduced by surface-water irrigation diversions. Diversions for municipal and industrial use have increased rapidly, but these diversions affect only the streamflow downstream from San Angelo. Statistical analyses showed the annual rainfall to be highly variable, with little serial correlation. Records of rainfall during the period 1943-68 are significantly different in character from previous long-term records. The frequency of monthly rainfall equal to or greater than 2.0 inches during the period 1943-68, and especially during the period 1962-68, was significantly less than the long-term averages. Analyses of annual runoff data, adjusted for depletions, show large variations in annual runoff. Coefficients of variation ranged from 0.8 to 1.4, and first-order serial correlations ranged from 0.01 to 0.28. The estimated recurrence interval of the 1962-68 drought is about 200 years. The analyses of rainfall-intensity and runoff data indicate that the basic cause for the relatively low runoff during the period 1962-68 was the lack of high-intensity, long-duration storms rather than any physical changes or agricultural practices in the watershed

Texas↗
USGS1925

Variation in annual run-off in the Rocky Mountain region: Chapter A in Contributions to the hydrology of the United States, 1923-1924

Records of run-off in the Rocky Mountain States since the nineties and for a few stations since the eighties afford a means of studying the variation in the annual run-off in this region. The data presented in this report show that the variation in annual run-off differs in different areas in the Rocky Mountain region, owing to the differences in the sources of the precipitation in these areas. Except in the drainage basins of streams in northern Montana the year of lowest run-off shown by the records was 1902, when the run-ff at one station was only 36 per cent of the mean run-ff for the periods covered by the several records available. The percentage variation of run-ff for streams in different parts of Colorado is less for any one year than that for streams in the mountain region as a whole, and for streams in the same major drainage basin the annual variation is markedly similar. The influence of topography upon variation in annual run-ff for streams in Colorado is marked, the streams that rise in the central mountain region having a smaller range in variation than the streams that rise on the eastern or western edges of the central mountain mass. The streams that rise on the plains just east of the mountains have a greater variation than those of any of the mountain groups. The ratio of any 10-year mean to the mean for the entire period covered by the records ranges from 72 to 133 per cent. For the South Platte, Arkansas, and Rio Grande the run-off during the nineties was below the normal, but since about 1903 it has been above normal. For the Cache la Poudre low-water periods occurred during the eighties and from 1905 to 1922, but during the nineties the run-off was above the normal.

Colorado;Montana;Wyoming↗
USGS1925

Power resources of Snake River between Huntington, Oregon and Lewiston, Idaho: Chapter C in Contributions to the hydrology of the United States, 1923-1924

Thousands of people are familiar with that part of Snake River where it flows for more than 300 miles in a general westward course across the plains of southern Idaho, but few have traversed the river where it flows northward and for 200 miles forms the boundary between Idaho and Oregon and for 30 miles the boundary between Idaho and Washington. Below the mining town of Homestead, Oreg., which is the end of a branch line of the Oregon Short Line Railroad, Snake River finds its way through the mountain ranges that seem to block its way to Columbia River in a canyon which, though not so well known, so majestic, nor so kaleidoscopic in color, is in some respects worthy of comparison with the Grand Canyon of the Colorado, for at some places it is deeper and narrower than the Grand Canyon at El Tovar. The Snake, unlike the Colorado, can be reached at many points through the valleys of tributary streams, and the early prospectors no doubt thoroughly explored all parts of the canyon. To traverse the river between Homestead, Oreg., and Lewiston, Idaho, is, however, a difficult undertaking and there are only a few records of boat journeys through the entire stretch. It has long been known that this portion of Snake River contains large potential water powers, but until recently no detailed surveys or examinations covering the entire stretch of the river had been made to determine their location or extent. A railroad has been proposed between Homestead and Lewiston which would provide a direct connection between the railroad systems of northern and southern Idaho. One function of the Geological Survey is to determine the possible interface between transportation routes on land and potential water-power development, and the information set forth in this paper has a bearing on that problem.

Idaho;Oregon↗
USGS1925

Some floods in the Rocky Mountain region: Chapter G in Contributions to the hydrology of the United States, 1923-1924

In 1923 severe floods occurred on the larger streams in Wyoming and a number of cloudburst floods on small streams in Wyoming and especially in Colorado. An investigation of the principal floods in each State was made, and the results are given in this paper, together with descriptions of two Colorado floods of 1922. In addition a study was made of all cloudburst floods to determine the areas chiefly subject to them.

Colorado;Wyoming↗