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(5) No head water or head pressure will be allowed in determining flow capacity of pipe culverts and <br /> box culverts that may cause a flooding condition. <br /> (6) All pipe culverts and box culverts shall have concrete headwalls at the inlet and outlet ends or flared <br /> end sections with concrete paved or grouted riprap slope protection. <br /> RUNOFF COEFFICIENTS FOR RATIONAL METHOD COMPOSITE ANALYSIS <br /> Runoff Coefficients Frequency <br /> Character of Surface 10 Years 25 Years 100 Years <br /> Undeveloped Areas: <br /> Historic flow analysis,greenbelts,agricultural, ` <br /> natural vegetation clay soil: <br /> Flat,2% .30 .33 .37 <br /> Average,2--7% .40 .44 .50 <br /> Steep,7%or greater .50 .55 .62 <br /> Sandy soil <br /> Flat,2% .12 .13 .15 <br /> Average,2--7% .20 .22 .25 <br /> Steep,7%or greater .30 .33 .37 <br /> Streets: <br /> laqw- <br /> Paved .90 .92 .95 <br /> Drives and Walks: .90 .91 .92 <br /> Roos: .90 .92 .95 <br /> Lawns: <br /> • Clay soil: <br /> Flat,2% .18 .20 .25 <br /> Average,2--7% .22 .28 .35 <br /> Steep,7% .35 .45 .60 <br /> Sandy soil <br /> Flat,2% .10 .25 .40 <br /> Average,2--7% .15 .30 .45 <br /> Steep,7% .20 .35 .50 <br /> (c) Street-related. <br /> (1) All street-related storm drains shall be designed based on the requirements of the master street <br /> plan and the master drainage plan upon enactment of a master drainage plan. <br /> (2) All roadway pavements shall be designed to eliminate cross flow of drainage across the <br /> pavement cross section or crossing the crown of the street. <br /> (3) All street crowns on residential streets shall be six inches, including a one-inch gutter slope to <br /> the curb. <br /> (4) Pipe culverts crossing city-owned street rights-of-way shall extend to the right-of-way lines. If <br /> side ditches are present, the pipe culverts shall extend as far to the right-of-way line as <br /> possible without obstructing the side ditch flow. Box culverts and bridges which cross city- <br /> owned street rights-of-way need not extend to the right-of-way lines on each side but shall be <br /> of sufficient width to accommodate the required vehicle roadway section, shoulders and <br /> pedestrian walkways. Box culverts having a clear span of less than six feet shall not qualify as <br /> a box culvert in the above provision but shall extend across the street from right-of-way line to <br /> right-of-way line. <br /> - 176 - Batesville Subdivision Regulations <br />