Drainage Design Manual, Hydrology - Flood Control District of ...

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Drainage Design Manual for Maricopa County Hydrology: Application 1 1150 143 0.00 0.00 0.00 0. * 2 0020 293 0.00 0.00 0.00 0. 1 1155 144 0.00 0.00 0.00 0. * 2 0025 294 0.00 0.00 0.00 0. 1 1200 145 0.00 0.00 0.00 0. * 2 0030 295 0.00 0.00 0.00 0. 1 1205 146 0.00 0.00 0.00 0. * 2 0035 296 0.00 0.00 0.00 0. 1 1210 147 0.00 0.00 0.00 0. * 2 0040 297 0.00 0.00 0.00 0. 1 1215 148 0.00 0.00 0.00 0. * 2 0045 298 0.00 0.00 0.00 0. 1 1220 149 0.00 0.00 0.00 0. * 2 0050 299 0.00 0.00 0.00 0. 1 1225 150 0.00 0.00 0.00 0. * 2 0055 300 0.00 0.00 0.00 0. * *********************************************************************************************************************************** 9-62 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application 9.5 CHANNEL ROUTING 9.5.1 Application of Normal-Depth Routing 1. Routing reaches should have relatively constant characteristics along the entire reach (i.e. geometry, slope, roughness, etc). If not, then consider subdividing the reach. 2. Too short of a routing reach may cause numeric instabilities and/or increase the peak discharge. The model output should be checked for unstable warning messages. If unstable warning messages are reported, then check the discharge range of instability in comparison to the peak discharge and plot the hydrograph for inspection. 3. If several short routing reaches occur in succession and attenuation is anticipated, then the channel routing operation can be replaced by a hydrograph lag operation. 4. Channel geometry must have sufficient capacity to convey the peak discharge. 5. The number of computational subreaches (NSTPS), should correspond to the lag time computed by HEC-1 for the routing reach. Example: An inflow hydrograph with a time to peak of 4.5 hrs is routed down a 5000 ft natural channel. The estimated NSTPS is 2 and NMIN is set to 5 min. The resulting time to peak of the routing operation is 4.92 hours, a lag of 25 minutes. The actual NSTPS should be (lag/NMIN)=5. This is an interactive process that should be repeated until NSTPS*NMIN approximates the lag. 9.5.2 Application of Kinematic Wave Routing 1. Kinematic Wave routing is most appropriately used where peak attenuation and channel transmission losses are not expected to be significant. The usual applications are for defined urban channels and short, steep natural channels, with minimal overbank flow. 2. When working with Kinematic Wave routing, channel capacity must be checked to assure proper conveyance of flow prior to the HEC-1 run. Otherwise, if the channel is undersized, the program will automatically extend channel boundaries to contain the flow. 3. The guidance, comments, and warnings in the HEC-1 User’s Manual should be studied and carefully observed in applying the Kinematic Wave method. August 15, 2013 9-63
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