Browsing by Author "Environmental Resources Center, Colorado State University, publisher"

Now showing 1 - 20 of 86

Open Access
1972 Federal Water Pollution Control Act's areawide planning provision: has executive implementation met Congressional intent?
(Colorado State University. Libraries, 1977) Stark, Dennis F., author; Environmental Resources Center, Colorado State University, publisher
Open Access
A State-of-the-art review: final report: urban-metropolitan institutions for water planning, development and management: an analysis of usages of the term "institutions"
(Colorado State University. Libraries, 1972) Wengert, Norman I., author; Environmental Resources Center, Colorado State University, publisher
Open Access
A system for geologic evaluation of pollution potential at mountain dwelling sites
(Colorado State University. Libraries, 1975) Waltz, James P., author; Environmental Resources Center, Colorado State University, publisher
Development of mountain homesites is accelerating in the Rocky Mountains of central Colorado. These homesites often require individual water wells and sewage disposal systems. Unfortunately, the widely used septic tank-leach field system generally is not suited for use in the mountainous terrain where soils are thin or missing. Although current federal regulations call for six feet or more of soil at the leach field site, many of the individual sewage disposal systems now in operation in the Rocky Mountain Region of Colorado fail to meet this requirement. Sewage effluent at these sites may directly enter bedrock fractures and travel large distances without being purified. As a consequence, contamination of streams, lakes, and ground water from these malfunctioning leach fields has become a problem of increasing magnitude. Investigations of geologic, topographic, and hydrologic conditions at over 100 homesites in the Rocky Mountains of north-central Colorado have resulted in the development of objective criteria for evaluating pollution potential at mountain homesites. In addition, the results of these investigatians indicate that contamination of water wells may be decreased significantly where geologic conditions are considered in the selection of sites for leach fields and wells. Although the results of these studies should be considered preliminary, they do tend to confirm that the orientation of jointing surfaces in the bedrock significantly affects the travel path of contaminants.
Open Access
A systematic treatment of the problem of infiltration
(Colorado State University. Libraries, 1971) Morel-Seytoux, Hubert J., author; Environmental Resources Center, Colorado State University, publisher
Open Access
Abridged bibliography: economics of water quality: salinity pollution
(Colorado State University. Libraries, 1971-06-15) Miller, Constance A., author; Environmental Resources Center, Colorado State University, publisher
Open Access
An application of multi-variate analysis in hydrology
(Colorado State University. Libraries, 1972-08-31) Yevjevich, Vujica M., 1913-, author; Dhyr-Nielsen, M., author; Schulz, Edmund F., author; Environmental Resources Center, Colorado State University, publisher
Multivariate analysis was used to make a selection of some of the more meaningful physical parameters dealing with the response of a small watershed to flood producing rainfall. Factor Analysis, Principal Component Analysis and a Correlation Coefficient Matrix was utilized. The list of 24 parameters was reduced to a list of 8 parameters. This reduction results in a very material economy in the encoding of relevant geomorphological data in flood analysis.
Open Access
An application of multi-variate analysis in hydrology
(Colorado State University. Libraries, 1972) Yevjevich, Vujica M., 1913-, author; Dhyr-Nielsen, M., author; Schulz, E. F., author; Environmental Resources Center, Colorado State University, publisher
Open Access
An economic analysis of water use in Colorado's economy
(Colorado State University. Libraries, 1975-12) Gray, S. Lee (Sanford Lee), author; McKean, John R., 1939-, author; Sparling, Edward W., author; Weber, Joseph C., author; Environmental Resources Center, Colorado State University, publisher
Open Access
An experimental study of soil water flow systems involving hysteresis
(Colorado State University. Libraries, 1973) Klute, Arnold, author; Gillham, R. W., author; Environmental Resources Center, Colorado State University, publisher
Open Access
An exploration of components affecting and limiting policymaking options in local water agencies: phase II
(Colorado State University. Libraries, 1970) Hill, Duane W., author; Meek, Ronald L., author; Environmental Resources Center, Colorado State University, publisher
Open Access
Analysis of Colorado precipitation
(Colorado State University. Libraries, 1975) Kuo, Marie Siew Man, author; Cox, Stephen K., author; Environmental Resources Center, Colorado State University, publisher
The objectives of the research proposal 'Anlaysis of Colorado Precipitation' fall into two categories. Firstly, 56 years of precipitation history were used to determine if there are any significant trends in regional and statewide precipitation in Colorado. This portion of the research is complementary to the work of Sellers (1960) who used the 90 year running mean of annual precipitation for 18 stations of Arizona and western New Mexico. Secondly, 20 years of Colorado hourly precipitation data were used to represent precipitation events, called 'storms'. and the data were examined to find storm frequency, length and yield. The storms were divided into size categories and were used to determine the contribution of each size of precipitation event to the annual total. Data from the western part of the state has been studied extensively because it is part of the upper Colorado River Basin which supplies water to the arid southwestern United States. Marlatt and Riehl (1963) found that most of the precipitation is produced in a few days and the amount of precipitation is correlated with the fraction of area receiving precipitation. In a comparison paper by Riehl and Elsberry (1964), consecutive days with precipitation were grouped together to form storms. The precipitation derived from medium size storms of 0.3 to 1.2 inches were found to be most closely related to the annual precipitation in the basin, and the size of storms roughly corresponds to the duration of the episode.
Open Access
Annotated bibliography on trickle irrigation
(Colorado State University. Libraries, 1975) Smith, Stephen Wade, author; Walker, Wynn Roger, author; Environmental Resources Center, Colorado State University, publisher
Open Access
Bacterial movement through fractured bedrock: a subproject of system for geologic evaluation of pollution potential at mountain dwelling sites
(Colorado State University. Libraries, 1972) Morrison, Sumner M. (Sumner Martin), 1919-, author; Allen, Martin J., author; Environmental Resources Center, Colorado State University, publisher
Open Access
Cache la Poudre River near Fort Collins, Colorado, flood management alternatives: relocations and levees
(Colorado State University. Libraries, 1975) Koirtyohann, Robert E., author; Miller, Ronald L., author; Pope, Loren W., author; Stein, Charles C., author; Environmental Resources Center, Colorado State University, publisher
Open Access
Colorado environmental data system (abridged edition)
(Colorado State University. Libraries, 1972) Whaley, Ross S., author; Dyer, A. A., author; Environmental Resources Center, Colorado State University, publisher
Open Access
Combined cooling and bio-treatment of beet sugar factory condenser water effluent
(Colorado State University. Libraries, 1971) Löf, George O. G., author; Ward, John Clayton, 1934-, author; Hao, Oliver Jing-Ching, author; Environmental Resources Center, Colorado State University, publisher
Open Access
Computer estimates of natural recharge from soil moisture data, High Plains of Colorado
(Colorado State University. Libraries, 1975) Longenbaugh, R. A. (Robert A.), author; Krishnamurthi, Narayanaswamy, author; Environmental Resources Center, Colorado State University, publisher
The research described briefly in this completion report has shown that transient soil moisture data observed at vertical positions at one station can be used as descriptors of natural groundwater recharge to evaluate its time distribution at that station. Hydraulic properties of the soil and initial and boundary conditions must be known before applying the mathematical model developed in this study to other locations. The model developed in this study assumed that the moisture content of unsaturated soil below the zone of influence of evapotranspiration varies in the linear range of the soil water characteristic curve. The parameters of the model characterize the hydraulic properties of the soil and their spatial variability. They were estimated by a linear statistical model. The mathematical model was solved by a Finite-Difference technique adopting the Crank-Nicholson scheme. The model was verified with an analytical solution and the agreement for the case of homogeneous soil was very good. Field data collected during a drainage cycle were used to verify the model for non-homogeneous soil. The verification was also found to be satisfactory in the latter case. The model was then applied to estimate recharge rates from data collected by the USGS and ARS at the Great Plains Field Experiment Station near Akron, Colorado. Estimated monthly recharge rates varied from a low of 0.02 inches to a high of 1.42 inches. Comparison of the Akron recharge estimates with other data indicates the values were acceptable. An average annual recharge of 4 inches was computed for the Akron site. This result was compatible with the observed rise in the local water table of 3 feet during the same time period.
Open Access
Consolidation of irrigation systems: engineering, legal, and sociological constraints and/or facilitators
(Colorado State University. Libraries, 1973) Skogerboe, Gaylord V., author; Radosevich, George, author; Vlachos, Evan, author; Environmental Resources Center, Colorado State University, publisher
Open Access
Coordination of agricultural and urban water quality management in the Utah Lake drainage area
(Colorado State University. Libraries, 1973) Walker, Wynn R., author; Huntzinger, Thomas L., author; Skogerboe, Gaylord V., author; Environmental Resources Center, Colorado State University, publisher
Open Access
Development of a drainage and flood control management program for urbanizing communities. Part II
(Colorado State University. Libraries, 1978) Riordan, Eugene J., author; Grigg, Neil S., author; Hiller, Robert L., author; Environmental Resources Center, Colorado State University, publisher
Urbanization causes an alteration of the stormwater runoff response of the urbanizing watershed which, in turn, increases stormwater damages downstream. Few communities have successfully implemented programs for managing these development induced drainage impacts due in part to the uncertainties associated with any drainage management program. Which rainfall-runoff model should be used, how sensitive is project analysis to poor discharge prediction, how should project cost be allocated, and so on. The objective of this research is to clarify these uncertainties and develop a readily implementable drainage and flood control management program for the mitigation of development-induced drainage impacts. These objectives are realized through a detailed examination of and recommendation on the three major elements of a drainage management program: the Technical element which establishes the method of flood hydrology calculation, the Financial element which establishes the methods for drainage and flood control cost calculation and cost allocation, and the Regulatory element which establishes the enforcement mechanism of the drainage management program. The recommended Technical element is based on the sensitivity of project analysis to poor runoff prediction, and on the predictive capability of various rainfall-runoff models. This predictive capability was evaluated for some of the more popular rainfall-runoff models through a statistical analysis of published results from those models. The recommended Financial element is based on a thorough review of the legal issues regarding: 1) municipal and developer liability with respect to development-induced drainage impacts, 2) project cost calculation, and 3) project cost apportionment.. A new approach for apportioning drainage and flood control facility costs between developers and the municipal government is presented. The approach utilizes existing engineering analysis techniques to divide project costs in proportion to the reduced liability attributable to the developers and to the municipal government. Two Regulatory elements are proposed for the drainage management program. The changes to existing legislation that are necessary to enforce the drainage management program under the proposed regulatory component are discussed and sample legislation is included for each. The report is divided into two parts. Part II is the complete project report with detailed discussions of the methods and data used, and of the research findings. Part I is written as a user publication. It summarizes the research methods and results, and discusses the recommended drainage management program.