The Panama Canal Review Is Published Twice a Year
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Project JYP-1104 SALT INTRUSION in GATUN LAKE a Major Qualifying
Project JYP-1104 SALT INTRUSION IN GATUN LAKE A Major Qualifying Project submitted to the Faculty of WORCESTER POLYTECHNIC INSTITUTE in partial fulfillment of the requirements for the Degree of Bachelor of Science By Assel Akhmetova Cristina Crespo Edwin Muñiz March 11, 2012 Jeanine D. Plummer, Major Advisor Associate Professor, Civil and Environmental Engineering 1. Gatun Lake 2. Salt Intrusion 3. Panama Canal Abstract The expansion of the Panama Canal is adding another lock lane to the canal, allowing passage of larger ships. Increases in the number of transits and the size of the locks may displace more salt from the oceans into the freshwater lake, Gatun Lake, which is a drinking water source for Panama City. This project evaluated future salinity levels in Gatun Lake. Water quality and hydrometeorological data were input into a predictive hydrodynamic software package to project salinity levels in the lake after the new lock system is completed. Modeling results showed that salinity levels are expected to remain in the freshwater range. In the event that the lake becomes brackish, the team designed a water treatment plant using electrodialysis reversal for salt removal and UV light disinfection. ii Executive Summary The Panama Canal runs from the Pacific Ocean in the southeast to the Atlantic Ocean in the northwest over a watershed area containing the freshwater lake, Gatun Lake. The canal facilitates the transit of 36 ships daily using three sets of locks, which displace large volumes of water into and out of Gatun Lake. The displacement of water has the potential to cause salt intrusion into the freshwater Gatun Lake. -
Assessing Ecological Infrastructure Investments COLLOQUIUM
PAPER Assessing ecological infrastructure investments COLLOQUIUM Wiktor Adamowicza, Laura Calderon-Etterb, Alicia Entemb,c, Eli P. Fenichelb,1, Jefferson S. Halld, Patrick Lloyd-Smithe,f, Fred L. Ogdenc,g,h, Jason A. Reginag, Mani Rouhi Radb, and Robert F. Stallardc,i aDepartment of Resource Economics and Environmental Sociology, University of Alberta, Edmonton, AB, Canada T6G 2H1; bSchool of Forestry and Environmental Studies, Yale University, New Haven, CT 06460; cSmithsonian Tropical Research Institute, 084-03092 Apartado, Panama; dForestGEO, Smithsonian Tropical Research Institute, 084-03092 Apartado, Panama; eDepartment of Agricultural and Resource Economics, University of Saskatchewan, Saskatoon, SK, Canada S7N 5A8; fGlobal Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada S7N 5A8; gDepartment of Civil and Architectural Engineering, University of Wyoming, Laramie, WY 82071; hHaub School of Environment and Natural Resources, University of Wyoming, Laramie, WY 82071; and iUS Geological Survey, Water Mission Area, Boulder, CO 80303 Edited by Stephen Polasky, University of Minnesota, St. Paul, MN, and approved December 3, 2018 (received for review February 28, 2018) Conventional markets can underprovide ecosystem services. De- (2). Irrespective of which type of contract is used, passing a liberate creation of a market for ecosystem services [e.g., a benefit–cost test is a precursor for successful contracting pro- payments for ecosystem services (PES) scheme] can close the grams (11). Ex ante benefit–cost assessment of a PES program gap. The new ecosystem service market alters behaviors and needs to be conducted within the context of the likely market, at quantities of ecosystem service provided and reveals prices for the appropriate and feasible ecological and social scales, and con- ecosystems service: a market-clearing equilibrium. -
THE PANAMA CANAL REVIEW May 3, 1957 1 - Qq, 0.0 -(3 Ad Hoc Committee Makes Initial Review
Vol. 7, No. 10 BALflOA HEIGHTS, tANAL ZONE, MAY 3, 1957 5 cents Gift ofthe Panama ^ CanalMuseum Once through the turbines, the water is spilled. Since water passing through the Madden Hydroelectric station goes into the Chagres River and then to Gatun Lake, where it can be used to lock ships through the Canal, the water used there was not lost. But at Gatun the water which generates electric power is spilled to sea and is of no further use. During the rainy season and during a normal dry season there is rainfall enough to supply the water consumed from Mad- den and Gatun Lakes for power genera- tion. This year, however, the area above Madden Dam was the driest since the Dam was built during the mid-1930's. March and the first two weeks of April were practically rainless, except for a few scattered showers. Of 13 rainfall stations reporting, nine received no measui'able rain in March. This meant that the amount left over for electric generation, after the record number of ships had been locked up and down, was lower than at any time since 1948 when there was also a protracted dry season, but without this year's heavy lockage load. The only answer to the water problem Protracted drought and heavy lockages were a drain on Canal Zone water supply was to stop hydroelectric generation but there was still plenty of water for young Isthmians, and older ones, as well. where large amounts of water are used; that meant that the Gatun plant would Zone Use Of Water Soars practically stop its operations. -