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9, Above a height of 12 feet the fill shall be placed <br />on a slope covered with t{e above described sand <br />4P 4 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 />�g concrete block shall be used and they shall be16 <br />filled with 2000 lb. concrete. <br />o cr eteFootinWallstoobexaeminimum ` <br />above the final <br />size of 10" deep by toad grade. wide with two 5/8 inch diame- <br />ter steel reinforcing bars. <br />11. For heights above(sx) feet-the design must be i <br />submitted 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 />acredrainage 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 shallbe based ear storm, <br />the D.O.T. rainfall curve for a 3 y <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 <br />and/or <br />or <br />as specified in the D.O.T. Sp;.' <br />concrete sidewalks. The form' dtd'"the construction <br />methods shall be as specified in the D.O.T. Speci <br />fications. <br />-12- <br />