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<br />Use P = 0.3' <br /> <br />5. Check for piping problems. For this example this step is <br />omitted. <br /> <br />6. Finalize dimensions. <br /> <br />GENERAl DISCUSSION OF VERTICAL DROP STRUCTURE DESIGN <br /> <br />The design chart for the vertical drop structure is based upon the <br />height of the drop and the normal depth and velocity of the approach and <br />exit channels. The channel must be prismatic throughout, from the <br />upstream channel through the drop to the downstream channel. <br />The maximum (steepest) allowable side slope for the riprap stilling <br />basin is 4:1. Flatter side slopes are allowable and encouraged when <br />available right-of-way permits. The riprap should extend up the side <br />slopes to a depth equal to one foot above the normal depth projected <br />upstream from the downstream channel. The maximum fall allowed at any <br />one drop structure is four feet from the upper channel bottom to the <br />lower channel bottom, excluding the trickle channel. <br />A detailed description of the drop structure and the design <br /> <br />~. <br /> <br />procedure, going from upstream to downstream is given below and shown on <br /> <br />Figure 3. <br /> <br />ELEMENTS OF THE VERTICAL DROP STRUCTURE <br /> <br />1. The upstream and downstream channels will normally be grass <br /> <br />lined trapazoidal channels with trickle channels to convey normal low <br /> <br />q <br />