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waste disposal areas..."
<br />DM#9. West end of ditch segment reconstructed last year. "V"
<br />shape ditch, 16.5' tw, 2.7' d, outside slope 25$, inside slope
<br />70$ (cross sectional area of 22.3 sq. ft). 1$ grade to east,
<br />rocky soil bottom. Cross sectional area substantially lower
<br />than approved design, however SEDCAD evaluation indicates
<br />sufficient capacity for design flow.
<br />DM#10. Approximately 60 feet from eastern terminus of ditch.
<br />Trapezoidal shape, 16' tw, 5' bw, 4.8' d (cross sectional area
<br />of 50 sq. ft). 1% grade to east, rocky soil bottom. Cross
<br />sectional area exceeds approved design, and SEDCAD evaluation
<br />indicates sufficient capacity for design flow.
<br />CRDA #1 Perimeter Collection Ditches
<br />Permit Exhibit 20 approved designs specify Northwest
<br />Collection Ditch "GG" as Trapezoidal, with 2' bw, 4.6' tw, and
<br />1.3' d. NW Collection Ditch "EE" is "V" ditch 2.2' deep, 8.8'
<br />tw, with adjacent berm 2.5' high with 10 foot top width.
<br />Southeast Collection Ditch "HH", Trapezoidal, 2' bw, 5.6' tw,
<br />1.8' d.
<br />No problems were identified by field measurements.
<br />DM#11. Lower section of SE Collection Ditch "HH", near
<br />junction of Terrace Drain #1. Trapezoidal, 11' tw, 3' bw, 2'
<br />d. 10% slope, 10"+ riprap. Dimensions exceed approved
<br />design, and SEDCAD evaluation indicates sufficient capacity
<br />for design flow, non erosive.
<br />DM#12. NW Collection Ditch "EE", approximately 300 feet above
<br />Pond 6 inlet. Trapezoidal, 13' tw, 5' bw, 1.6' d. 20 grade,
<br />vegetated channel. Dimensions exceed approved design, and
<br />SEDCAD evaluation indicates sufficient capacity for design
<br />flow, non erosive. Adjacent berm present as specified.
<br />DM#13. NW Collection Ditch "EE" at upper end of low gradient
<br />segment just below sharp curve where Segment "GG" enters "EE".
<br />Trapezoidal, 13' tw, 5.5' bw, 1.5' d, 2$ grade, 12" riprap.
<br />Dimensions exceed approved design, and SEDCAD evaluation
<br />indicates sufficient capacity for design flow, non erosive.
<br />Adjacent berm present as specified.
<br />DM#14. NW Collection Ditch "GG" approximately 40 feet below
<br />junction of Terrace Drain #2. Trapezoidal ditch 10.5' tw, 4'
<br />bw, 2' d, 7% grade, riprap lined. Dimensions exceed approved
<br />design, and SEDCAD evaluation indicates sufficient capacity
<br />for design flow, non erosive. Note that ditch segment in this
<br />vicinity was included in NOV C-97-016, issued on October 3,
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