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<br />(3) If an alternate method of anchoring is proposed by the <br />applicant, such method shall be certified by a registered <br />professional engineer or architect licensed in the State of <br />Colorado, to accommodate the hydrostatic and hydrodynamic <br />forces expected at the site. <br /> <br />D. Floodways. Located within areas of special flood hazard <br />established in Section 97-6A are areas designated as floodways. <br />Since the floodway is an extremely hazardous area due to the <br />velocity of floodwaters which carry debris, potential projectiles <br />and erosion potential, the following provisions apply: <br /> <br />(I) The alteration of any channel shall be minimized, except as <br />may be required for improvement of wildlife habitat or public <br />heal th, safety and welfare; provided, however, that in no <br />instance shall such alteration result in any increase in <br />flood levels during the occurrence of the base flood <br />discharge. <br /> <br />(2) Encroachments, including fill, new construction, substantial <br />improvements and other development, are prohibited unless <br />certification by a registered professional engineer licensed <br />in the State of Colorado is provided demonstrating that such <br />encroachments will not result in any increase in flood levels <br />during the occurrence of the base flood discharge. Such <br />certification for bridges may be obtained by a registered <br />professional engineer or architect licensed in the State of <br />Colorado. <br /> <br />(3) If the above subsection is satisfied, all new construction <br />and substantial improvements shall comply with all applicable <br />flood hazard reduction provisions of Section 97-4. <br /> <br />E, Use of openings in enc losures below a structure I s lowest floor. <br />For all new construction and substantial improvements, fully, <br />enclosed areas below the lowest floor that are subject to flooding <br />shall be designed to automatically equalize hydrostatic flood <br />forces on exterior walls by allowing for the entry and exit of <br />floodwaters. Designs for meeting this requirement must either be <br />certified by a registered professional engineer or architect or <br />must meet or exceed the following minimum criteria: <br /> <br />(I) A minimum of two (2) openings having a total net area of not <br />less than one (I) square inch for every square foot of <br />enclosed area subject to flooding shall be provided, <br /> <br />(2) The bottom of all openings shall be no higher than one (!) <br />foot above grade. <br /> <br />(3) Openings may be equipped with screens, louvers or other <br />coverings or devices, provided that they permit the automatic <br />entry and exit of floodwaters. <br /> <br />Page 14 <br />