PPT-Runoff Processes Reading: Applied Hydrology Sections 5.6 to 5.8 and Chapter 6 for Thursday

Surface water Watershed area of land draining into a stream at a given location Streamflow gravity movement of water in channels Surface and subsurface flow Affected by climate land cover soil type etc. Jon . Luevano. Urbanization. Growth and development of cities. Large population density. Highly industrialized. Comparing city to city. Size (area). Population density. Percentage of urban coverage. Hydrological impacts . - BASIC CONCEPTS. Hydrology . Hydrology . is the science of the waters of the . earth and . its atmosphere. It deals with occurrence, circulation, distribution and movements of these waters over the globe and their interaction with the physical and biological environments. Basic . Concepts. Lamar Smith. Cascabel Ranch and Consulting. Carta Valley, Texas. OBJECTIVES. Understand water balance. Understand basic erosion processes on rangeland. Understand how brush control affects water yield and . Learning objectives. Be able to use stationary linear response methods (unit hydrograph) to calculate catchment response. Be able to estimate the unit hydrograph from data . Be able to describe the assumptions, limitations and uses of linear response methods . Stream Gauges. Hydrologic Forecast Process. Forecast Considerations. Forecast Hydrographs. 3-1. Stream Gauges. Stream Gauges. Stream Gauges. Stream Gauges. Stream Gauges. Stream Gauges. Stream Gauges. http://www.tsarp.com/. Most costly urban flood disaster in the history of the United States. Major Highways during Tropical Storm Allison. I-45 South. I-10 West. http://www.chron.com/content/chronicle/special/01/flood/. Professor Ke-Sheng Cheng. Dept. of Bioenvironmental Systems Engineering. National Taiwan University. Runoff generating process. Rainfall losses during a storm event. Interception. Depression storage. 15-5. 2. Hydrologic design. For water control. Mitigation of adverse effects of high flows or floods. Design flows for conveyance structures (storm sewers, drainage channels) and regulation structures (detention basins, reservoirs). 2. Flow Routing. Procedure to determine the flow hydrograph at a point on a watershed from a known hydrograph upstream. As the hydrograph travels, it. attenuates . gets delayed. Q. t. Q. t. Q. t. Q. t. Runoff. Streamflow. Generation. Excess Rainfall and Direct Runoff. SCS Method for runoff amount. Examples from Brushy Creek. Reading for today: Applied Hydrology sections 5.1 to 5.6. Reading for Tuesday Feb 19: Applied Hydrology Sections 5.7 and 5.8, Chapter 6. 18. Contents. . Report 1: . Posina. Flood . event. . analysis. and . modelling. . . see. : . . SCS . - Curve . Number. . method. Application. . of the SCS – CN . method. at . hourly. . steps. 2. Frequency analysis for extreme events . If you know T, you can find y. T. , and once y. T. is know, x. T. can be computed by . Q. Find a flow (or any other event) that has a return period of T years. Hydroclimatology. (. Multiscale. Hydrology). A science dealing with the properties, distribution and circulation of water.. R. . Balaji. balajir@colorado.edu. CVEN5333 . http://civil.colorado.edu/~balajir/CVEN5333. of runoff. Learning objectives . Be able to describe the processes involved in runoff generation. Be able to distinguish between infiltration excess, saturation excess and subsurface . stormflow. runoff generation mechanisms and identify when and where each is more likely to occur.