Spreadsheet: 466746d1466428711-workbook-opens-slowly-after-protecting-all-worksheets-sediment-basin-designer
Sheet: Time of Concentration

 |  |  |  |  |  |  | SEDIMENT BASIN DESIGN
 |  |  |  |  |  |  | Project Information
 |  |  |  |  |  |  |  |  | Project Number: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Date:
 |  |  |  |  |  |  |  |  | PI Number: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Designer:
 |  |  |  |  |  |  |  |  | County: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Note:
 |  |  |  |  |  |  | TIME OF CONCENTRATION
 |  |  |  |  |  |  | [NAME]
 |  |  |  |  |  |  |  |  | 1. Surface Description (Table 3-1)………………………………………………………………………………………………………………
 |  |  |  |  |  |  |  |  | 2. Manning's rouhgness coefficient, n …………………………………………………………………………………………………..
 |  |  |  |  |  |  |  |  | 3. [NAME], L (total ≤ 100 ft) …………………………………………………………………………………………………………….
 |  |  |  |  |  |  |  |  | 4. Two-year 24-hour rainfall, [NAME] (in) ……..…………………………………………………………………………………………………………..
 |  |  |  |  |  |  |  |  | 5. Land slope, s (ft/ft) ……………………………..………………………………………………………………………………………………………..
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.007  (nL)0.8
 |  |  |  |  |  |  |  |  | 6. |  |  |  |  | Tt= |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Calculated Travel Time, [NAME] …………………………………………
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | P20.5s0.4
 |  |  |  |  |  |  | Shallow Concentrated Flow
 |  |  |  |  |  |  |  |  | 1. Surface Description (Table 3-3 -- FHWA HEC 22) ………………….………………………………………………………………………………………………………….
 |  |  |  |  |  |  |  |  | 2. Intercept coefficient, k ……..………………………………………………………………………………………………..
 |  |  |  |  |  |  |  |  | 3. [NAME], L (ft) …………………………...…………………………………………………………………………………………………………….
 |  |  |  |  |  |  |  |  | 4. Watercourse slope, s (ft/ft) ……..…………………………………………………………………………………………………………..
 |  |  |  |  |  |  |  |  | 5. Velocity, V      V = Ku*k*sp0.5  (Ku = 3.28 in English units) ……………………………..………………………………………………………………………………………………………..
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | L
 |  |  |  |  |  |  |  |  | 6. |  |  |  |  | Tt= |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Calculated Travel Time, [NAME] …………………………………………
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3600*V
 |  |  |  |  |  |  | Channel Flow
 |  |  |  |  |  |  |  |  | 1. Cross-sectional Area, a (ft2) ………………….………………………………………………………………………………………………………….
 |  |  |  |  |  |  |  |  | 2. Wetted Perimeter, Pw (ft) ……..…….……………………………………………………………………………………………..
 |  |  |  |  |  |  |  |  | 3. [NAME], R …………………………...…………………………………………………………………………………………………………….
 |  |  |  |  |  |  |  |  | 4. Channel Slope, s (ft/ft) ……………………………………………………………………………………………………………………………………
 |  |  |  |  |  |  |  |  | 5. Channel Surface Description ……………………………………………………………………………………………………………………………………
 |  |  |  |  |  |  |  |  | 6. Channel Manning's roughness coefficient, n ……………………………………………………………………………………………………………………………………
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | V= |  |  |  | 1.49 r2/3 s1/2
 |  |  |  |  |  |  |  |  | 5. Velocity, V |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Calculated Velocity …..…………………………………………
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | n
 |  |  |  |  |  |  |  |  | 6. [NAME], L (ft) …………………………...…………………………………………………………………………………………………………….
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | L
 |  |  |  |  |  |  |  |  | 7. |  |  |  |  | Tt= |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Calculated Travel Time …………………………………………
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3600*V
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | TOTAL TIME OF CONCENTRATION
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