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9. Above a height of 12 feet the fill shall be placed <br />on a slope covered with the above described sand <br />cement bags, or other approved methods. <br />1. If concrete blocks are chosen for headwalls <br />they shall be as follows: <br />10. For heights of headwalls up to 6 (six) feet, 8 inch <br />concrete block shall be used and they shall be <br />filled with 2000 lb. concrete. Walls to extend 16" <br />above the final road grade. Footing to be a minimum <br />size of 10" deep by 16" wide with two 5/8 inch diame- <br />ter steel reinforcing bars. <br />11. For heights above 6 (six) feet the design must be <br />submitted for approval. <br />'12. All driveway culverts shall be corrugated metal <br />asphalt coated or aluminum and of gage as specified <br />by D.O.T. minimum diameter 12". <br />13. All drainage outlets into Drainage District canals <br />shall be by culverts to prevent eroding in the main <br />canal system. A minimum size of fifteen inches is <br />required and a minimum length of fifteen feet in a <br />ditch of approximately three feet in depth, longer <br />lengths for deeper ditches. It is also required <br />that a ditch be dug on the inlet side of the culvert <br />to act as a sediment box until the new ditch is in <br />growth. The minimum size noted above is for a ten <br />acre drainage area or less. Larger sizes are <br />required for larger drainage areas. Calculation <br />basis shall be a coefficient of C-1/3 in Talbot <br />Formula. Design calculations shall be based on <br />the D.O.T.. rainfall curve for a 3 year storm, Miami <br />area. Runoff coefficients and velocities shall <br />conform to D.O.T. standards. <br />14. The minimum length of culvert placed under any <br />County road for cross drainage into a Drainage <br />District ditch shall be 60 feet. <br />G. If it is elected to construct sidewalks along each side <br />of each street, they shall be constructed in accordance <br />with the following specifications: <br />1. The concrete shall be 2000 lbs. concrete and/or <br />as specified in the D.O.T. Specifications for <br />concrete sidewalks. The forms and the construction <br />methods shall be as specified in the D.O.T. Speci- <br />fications. <br />' -12- <br />MAR 191975 <br />eoox PAGE155 <br />