4/1/1958 - Laserfiche WebLink

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(g) If sand bag rip rap is chosen for headwalls, they shall be as follows: g.l The mixture shall be in a proportion of 1 cubic foot of cement to 5 cubic foot of clean sand. This mixture is to be placed in approved, tied cloth bags. Between each layer of bags there is to be a sand cement mixture as described above. g.2 For heights of head walls up to six feet - a one eighth inch to one foot batter shall be made. g.3 For heights between 6 foot and 12 foot, the footing shall be 3 bags wide, gradually decreasing the number to a one bag width at the top. g.4 Above a height of 12 foot, the fill shall be placed on a slope of 132- foot to 1 foot and the slope covered with the above described sand cement bags, or other approved methods. (h) If concrete blocks are chosen for headwalls they shall be as follows: H.1 For heights of headwalls up to 6 feet, 8 inch concrete block shall be used and they shall be filled with 2000 lb. concrete. Walls to extend 16" above the final road grade. Footing to be a minimum size of 10" deep by 16" wide with 2 5/8 inch diameter steel reinforcing bars. h.2 For heights between 6 feet and 12 feet, 8@ concrete block shall be used and filled with 2000 1b. concrete with 5/8 inch vertical reinforcing bars spaced 2411 on centersh 4 Walls to extend 16" above the final road grade. Footing to be a minimum size of 10" deep by 20" wide with 3 5/8" diameter steel reinforcing bars. There shall be tie bars 5/8" in dia- meter between walls on 4' centers, with a minimum cover of 18". h.3 For heights hbove 12 feet, the design must be submitted for approval. (i) All culverts shall be corrugated metal, asphalt coated, and of gage as speci- fied by the county engineer. (j) All drainage outlets into Drainage District canals shall be by culverts to pre- vent eroding in the main canal system. A minimum size of fifteen inches is required and a minimum length of fifteen feet in a ditch of approximately three foot in depth, longer lengths for deeper ditches. It is also required that a ditch be dug on the inlet side of the culvert to act as a sediment box until the new ditch is in growth. The minimum size noted above are for a ten acre drainage area or less. Larger sizes are required for larger drainage areas. Calculation basis to be a coefficient of C-1/3 in Talbot Formula. (k) All plats shall show the finished road elevations at each intersection and at the middle of the block with ditch arrows to indicate the direction of drainage. All lot elevations shall be shown at the approximate position of the building site on the lot, such elevations to be shown on at least all of the end lots and on at least 4 lots in between, specifically showing any lot elevations which are substantially lower than the elevations shown according to the above formula. All lots must have sufficient elevation to provide adequate drainage to render the site habitable. The County Engineer may, in his discretion, require a separate Contour Drainage Map. (1) In every instance in .which the property being platted borders on the Indian River or the Sebastian River or upon -any finger, bay or channel therefrom, then the elevation of the land as it exists or the elevation of the land as it shall exist in its finished con- 0 1 1 i 1 0 E 1 41