Lecture12 watershed management and assessment dung 2016

VNUF-2016 Lecture #11 Watershed Management and Assessment Principles of Watershed management Dr Bui Xuan Dung- Department of Environment Management Multiple-use concept Management of watershed resources to produce more than one product or amenity Multiple-use includes… Lands • Agriculture • Forest • Urban Resources • • • • • • Water Timber Wildlife Livestock Recreation Ecosystem function Multiple-use refers… Utilization of resources for various purpose Water •Irrigation •Drinking •Industrial operations •Recreation Timber •Lumber •Pulpwood •Fuel Objectives of Multiple-Use Management To manage the natural resource mixture for the most beneficial combination of present and future use Continuous use of several natural resources Rotating the use of various natural resources products Geographical combination of use Resource Management Goals • Conserve and enhance public health • Conserve and enhance watershed ecosystems • Support watershed resource use to achieve water quality standards and soil conservation goals • Reduce or prevent pollutant loadings and other stressors Regional and watershed demand can be… Estimation of natural resource production • Our knowledge for natural processes Water cycling Precipitation Evapo-transpiration Runoff response Water buget Sediment movement Soil surface erosion Mass movement Forested land Agriculture land Changes in resource availability Changes in landslides Fish and other organisms • Physical and chemical barrier for fish and the other organisms (dams etc) • Wildlife habitat • Fisheries resources uses • Fish habitat protection Mining impacts • Discharge of sediment from mining site • Gravel mining on stream • Mass movement on mining sites Lake/Ponds and Coastal shoreline • • • • Water usage Water quality Shoreline constriction Veneration types on shoreline Step 4: Evaluate your data • Enough data? • Enough data for defining condition of watershed? • Enough data for identifying problem? • Enough data for identifying area with problems? • More study needs? Step 5: Suggest Watershed management • • • • Specific preservation and restoration goal Specific land use planning Area need to be preserved Specific actions for solving water and sediment problem The Longitudinal Profile The Upper Course The Middle Course Alluvial Fan The Lower Course Meandering river Sediment budget Sediment input, output, and change for a particular stream systems or channel reach Sediment sources Rate of movement Amount and types of sediment for storage Linkages among the processes of transfer and storage site Importance of scaling 10000 YR Volcanic activities Earthquakes 1000 YR 100 YR Tectonic activities Glacier activities Climate change Mass movement 10 YR Year Channel Forms Month Hydrologic regime and Water Quality Day Time Bedload and suspended sediment Single particle cm m 10 m km 10 km 100 km Relative spatial scale 1000 km 10000 km Adaptive Management • • • • • What is it? Adaptive: recognizes change Learns Modifies to fit new situation In ecosystem management we need to show this type of adaptive behavior - seek information (positive or negative) - Reward those who bring it - LEARN from it Conditions for successful Adaptive management ... information identify and evaluate problems or concerns • Forest watershed • Agriculture watershed • Urban Watershed Landuse • • • • Past and current landuse Zone of landuse (upland and lowland) Protection... integrative and comprehensive land management planning More sustainable approach for future development Watershed Assessment • A critical step in developing and implementing a watershed management. .. aspect of watershed • Evaluating how various land use can affect the environmental and economic health of the watershed Watershed Assessment Process Step 1: Develop an approach for the assessment