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for the 10 year - 24 hour event as previously described. Once the peak discharge volume is <br />known, an assumed minimum headwater depth of 1.0 foot was utilized to determine the <br />• appropriate culvert size utilizing the SedCad + Version 3.0. Copies of the culvert sizings are <br />found in Appendix B, and a listing of culvert sizes in place may be found in Table 90-06-10. <br />Culvert locations are shown on Map 4a (Hydrology and Sediment Controll. <br />• <br />• <br />TR 90-06 Exhibit 3 - 12 Revised 1 1 /16/90 <br />