By Baxter E. Vieux

1. five REFERENCES 127 7 electronic TERRAIN 129 1. 1 creation 129 1. 2 DRAINAGE community one hundred thirty 1. three DEFINITION OF CHANNEL NETWORKS one hundred thirty five 1. four solution based results 138 1. five CONSTRAINING DRAINAGE course 141 1. 6 precis a hundred forty five 1. 7 REFERENCES 146 eight PRECIPITATION dimension 149 1. 1 creation 149 1. 2 RAIN GAUGE ESTIMATION OF RAINFALL 151 ADAR STIMATION OF RECIPITATION 1. three R E P a hundred and fifty five 1. four WSR-88D RADAR features 167 1. five enter FOR HYDROLOGIC MODELING 172 1. 6 precis 174 1. 7 REFERENCES a hundred seventy five nine FINITE aspect MODELING 177 1. 1 advent 177 1. 2 MATHEMATICAL formula 182 1. three precis 194 1. four REFERENCES 195 10 allotted version CALIBRATION 197 1. 1 advent 197 1. 2 CALIBRATION technique 199 1. three dispensed version CALIBRATION 201 1. four automated CALIBRATION 208 1. five precis 214 1. 6 REFERENCES 214 eleven disbursed HYDROLOGIC MODELING 217 1. 1 advent 218 1. 2 CASE reports 218 1. three precis 236 1. four REFERENCES 237 12 HYDROLOGIC research AND PREDICTION 239 1. 1 advent 239 x disbursed Hydrologic Modeling utilizing GIS 1. 2 VFLO™ variants 241 1. three VFLO™ positive aspects AND MODULES 242 1. four version function precis 245 1. five VFLO™ REAL-TIME 256 1. 6 info specifications 258 1. 7 dating TO different versions 259 1. eight precis 260 1.

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The upstream and downstream nodes on each stream fragment were then flagged. Each downstream node was “drained” along the line of maximum descent until it connected with another streamline. The streams were again thinned to the final, one-cell wide, line representation of the stream network. More recent research has improved upon these models, and many GIS modules exist for processing DEMs and delineating watersheds. Skidmore (1990) compared these three methods for mapping streams and ridges from the digital elevation model with a new algorithm that utilizes basic map delineation.

In mid-latitudes around 2. DATA SOURCES AND STRUCTURE 47 29 the world, identical projections are made in each zone of 6º longitude (360º/60). This means that the coordinates in the projected surface uniquely describe a point only within the zone. The projected coordinates are in meters with the x-coordinate (east west) of 500 000 m being assigned to the central meridian of each zone. It is not enough to say that a particular point is located at x = 500 000 and y = 2 000 000 m, because in the UTM projection we must also specify the zone.

Figure 1-7 shows the location of saturation excess next to a stream channel. Representing this type of runoff process requires information about the soil depth and hydraulic properties affecting the velocity of water moving through the subsurface. Infiltration modeling that relies on soil properties to derive the Green and Ampt equations is considered in Chapter 5. 9 Hydraulic Roughness Accounting for overland and channel flow hydraulics over the watershed helps our ability to simulate hydrographs at the outlet.

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