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<br />January 2004 <br /> <br />e <br /> <br />e <br /> <br />(4) <br /> <br />When approved by the Director of Planning or his designated <br />appointee, bridge attachments for elevated water line crossings <br />may be made instead of separately supported crossings. <br />Design elevated crossings with the elevation of the bottom of <br />the water line 2 feet above the 100-year floodplain elevation <br />Create a high point in the elevated stream or ditch crossing <br />and provide an air release valve at that highest point of the <br />water line. <br />Provide sufficient span length to accommodate the cross <br />section of future widening of the stream or ditch to ultimate <br />cross section. <br />Base the columns' support designs on soil capacity, spacing, <br />loading, and all pertinent structural requirements. <br />Spacing of supports shall consider effect of support on channel <br />hydraulics and be subject to city approval. <br />Provide pedestrian pipe guards on elevated crossings. The <br />Planning Department can be contacted for this detail. <br /> <br />(5) <br />(6) <br /> <br />(7) <br /> <br />(S) <br />(9) <br />(10) <br /> <br />b. Underground Crossings <br /> <br />(I) Provide a minimum 5 foot clearance from the top of the <br />pipeline to the ultimate flow line of the ditch. <br />(2) Provide sufficient length to exceed the ultimate future <br />development of the stream or ditch. <br />(3) Water lines shaH be C-900 or ductile iron pipe and shall <br />extend a minimum of 15 feet beyond the last bend or to the <br />right of way line, whichever is greater. <br />(4) Where other agencies have review authority or jurisdiction <br />and have different underground crossing requirements, the <br />stricter of the two shaH apply. <br /> <br />3. State Highway and County Road Crossings <br /> <br />a. Extend carrier pipe from right-of-way to right-of-way <br />b. In cases where the State of Texas or Harris County shall have review <br />powers, the use of any and aH materials and the design thereunto <br />appertaining shall be governed by their requirements. The approval of <br />the design by the appropriate governmental agency shall be sought, <br />obtained and demonstrated to the City of La Porte before plans will be <br />approved. <br />c. Where additional right-of-way has been acquired for future widening, <br />the casing shaH extend 5 feet beyond each right-of-way line. <br /> <br />4. Railroad Crossings <br /> <br />a. <br /> <br />For mainline and spurHne railroad crossings, the water line shall meet <br />the requirements of the governing agency and such requirements shall <br />be followed from 5 feet beyond each right-of-way line and across the <br />right-of-way itself. Any deviation must be approved by the railroad <br />companies. The approval of the design by the appropriate governing <br />agency shall be obtained and demonstrated to the City of La Porte <br />before plans will be approved. <br />Where there is no railroad but a railroad owned easement or right-of- <br />way, as a minimum extend a steel casing from right-of-way to right-of- <br />way line. <br /> <br />b. <br /> <br />Water System Design Criteria Page 9 of 13 <br />