PPT-Unit Hydrograph Reading: Sections 7.1-7.3, 7.5, 7.7,

Hydrologic Analysis Change in storage wrt time inflow outflow In the case of a linear reservoir S kQ Transfer function for a linear system S kQ Proportionality and superposition. Residence Time. Mean Water Residence Time (aka: turnover time, age of water leaving a system, exit age, mean transit time, travel time, hydraulic age, flushing time, or kinematic age). T. . = V. . 7.1 Components of a natural hydrograph. The various contributing components of a natural hydrograph are shown in figure 7.1. To begin with there is baseflow only; that is, the groundwater con­tribution from the aquifers bordering the river, which go on discharging more and more slowly with time. The hydrograph of baseflow is near to an exponen­tial curve and the quantity at any time is represented very nearly by:. Reading: Sections 7.1-7.3, 7.5, 7.7, . Hydrologic Analysis. Change in storage w.r.t. time = inflow - outflow. In the case of a linear reservoir, . S = kQ. Transfer function for a linear system (S = kQ).. 1.With . the help of a neat sketch, explain the various component parts of single peaked storm hydrograph. .. 2. Explain . with the help of sketches, the three methods of base line separation. .. 3. Derive . 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 . Rami. . Harfouch. Surface Water Hydrology. University of Texas at Austin, April 2010. Peak flows (flood applications, channels design). Rationale method Q=C . i. A. Hydrograph (storage structures design). From Mays, 2011, Ground and Surface Water Hydrology. See tabulated values in Mays Table 8.8.1. Example. A watershed has 40% residential (1/4 ac lots), 25% open space (good condition), 20% commercial and business (85% impervious) and 15% industrial (72% impervious) with corresponding soil groups of C, D, C and D. . CE 365K Hydraulic Engineering Design. Spring . 2016. Watersheds upstream of Dam 6. Subbasin. BUT_060. Flow along the longest path. Sheet Flow. Shallow Flow. Channel . Flow.  . Sum travel times over each segment. Bucket. Recording gage. Collector and Funnel. Bucket and Recorder. Accurate to .01 ft. Telemetry- computer. From . Bedient. Interpretation of storm rainfall records. From Mays, 2011, Ground and Surface Water Hydrology. on streams throughout the USA. Tonia Hack. William Sanford. Department of Geosciences. Colorado State University. Separate hydrograph using 2-component end member mixing. Estimate . baseflow. Compare to analytical methods: fixed interval, sliding interval, local minimum. 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. 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. From Mays, 2011, Ground and Surface Water Hydrology. A D hour unit hydrograph is the characteristic response of a given watershed to a unit volume (e.g. 1 in or cm) of effective water input (usually rain) applied at a constant rate for D hours. HYDROGRAPHS. A hydrograph is a continuous graph showing the properties of stream flow with respect to time. Normally obtained by means of a continuous strip recorder that indicates stage versus time (stage hydrograph) and is then transformed to discharge hydrograph by use of rating curve..