Continuing Education Course #101 Drainage Design with WinTR-55

Transcription

1 1 of 5 Continuing Education Course #101 Drainage Design with WinTR WinTR-55 uses the Kinematic Wave method for calculating storm runoff rates and volumes. 2. According to the Velocity Method, the maximum length for sheet flow is: a. 100 feet b. 200 feet c. 300 feet d. 400feet 3. WinTR-55 does not allow the use of user-defined rainfall distributions. 4. WinTR-55 rainfall depth is limited to: a. 35 inches b. 40 inches c. 45 inches d. 50 inches 5. Sub-area entry and summary data can either be entered directly into the main window table or computed elsewhere within the program 6. Which of the following applies to drainage sub-areas entered into the Main Window of the WinTR-55 program? a. Sub-area names must be no more then ten (10) characters long with at least one alphabetical character b. An optional sub-area description may also be entered and must be no more than 25 characters long c. The sub-area drainage area, weighted curve number and time of concentration is either entered into the sub-area entry and summary table or computed using the Land Use Details window and/or the Time of Concentration Details window d. All of the above 7. Multiple hydrologic soil group entries can be made for a single cover description. 8. Which of the following does not apply to the Custom Curve Number window? a. The curve numbers for Urban and Residential land use given here are based on assumed average percent impervious area. b. If these curve numbers are not appropriate for the use intended, revised values can be computed. c. Impervious surface is assumed to have a CN = 90. d. Unconnected impervious area only occurs if impervious surface is less than or equal to 30 percent of the watershed area. 9. Which of the following applies to the Land Use Details window? a. Sub-area entries are made based on cover description and hydrologic soil group.

2 2 of 5 b. A new sub-area can be entered by clicking in the combo box and typing in the name. c. The sum of the entered sub-areas is displayed as the Project Area near the bottom left corner of the window d. All of the above 10. No more than five flow segments are allowed for a sub-area: one for sheet flow and two each for shallow concentrated and channel flow. 11. Which of the following applies to the Reach Data window? a. Every reach must have a downstream receiving reach assigned to it. b. The program will accommodate a maximum of twelve (12) reaches and no more than this will be accepted in the receiving reach box. c. Data required for channel routing includes reach length, Manning s n, friction slope, bottom width and side slope d. Channel routing is based on the Saint Venant method. e. Both a and c are correct 12. Sandler Chase is a acre proposed residential sub-division located in Duval County, Florida. The undeveloped site consist of 7.25 acres pasture in good condition with hydrologic soil group (hsg) B, 4.80 acres woods in good condition with hsg C and acres farmstead with hsg C. The flow path consist of : 100 feet sheet at ft/ft slope over light woods (0.40); 941 feet shallow concentrated at ft/ft slope over unpaved surface and 398 feet channel at ft/ft slope, Manning s coefficient 0.035, flow area 3.00 square feet and wetted perimeter 5.11 feet. What is the existing peak discharge rate during the 25-year, 24-hour storm event? Assume the Type II Florida Modified Custom Rainfall Distribution Window. a cfs b cfs c cfs d cfs Use the following data to answer questions The developed Sandler Chase site will have the following characteristics: Basin A 7.70 acres ¼-acre lots residential sub-division hsg C Pond 1.3 acres area at spillway crest 1.55 acres area at 2.65 feet above spillway crest Basin B Basin C acres ¼-acre lots residential sub-division 7.25 acres hsg B acres hsg C Pond 1.59 acres area at spillway crest 1.93 acres area at 2.75 feet above spillway crest 2.64 acres ¼-acre lots residential sub-division hsg C Pond 0.55 acre area at spillway crest 0.71 acres area at 2.75 feet above spillway crest

3 3 of What is the weighted CN for the developed Sandler Chase Basin B? a. 80 b. 78 c. 81 d What is the total proposed peak discharge rate for Sandler Chase during the 25-year, 24-hour storm event assuming 36-inch diameter outfall pipes? a cfs b cfs c cfs d cfs 15. For Sandler Chase developed condition, what is the maximum commonly available diameter pipe needed to assure attenuation of the peak discharge rate to no greater than the pre-developed rate for the 25-year, 24-hour storm event? Assume three equal diameter outfall pipes. a. 18 inch b. 24 inch c. 30 inch d. 36 inch 16. What is the peak stage in the developed Sandler Chase Basin B during the 50-year, 24-hour storm event? Assume the same diameter outfall pipes as determined in problem 15 above. a feet b feet c feet d feet Use the following data to answer questions Grant Estates is a proposed residential sub-division located in Saratoga, New York. The undeveloped site consist of three basins with a total area of 36 hectares and the following characteristics: Basin A: 5 ha pasture in good condition with hydrologic soil group (hsg) B 3 ha woods in good condition with hsg B 6 ha farmstead with hsg A The flow path consist of : 30 meters sheet at m/m slope over light woods (0.40); 275 meters shallow concentrated at m/m slope over unpaved surface and 125 meters shallow concentrated at m/m slope over unpaved surface. Basin B: 4 ha pasture in good condition with hsg A 3 ha woods/grass combination in good condition with hsg A 4 ha woods/grass combination in good condition with hsg B 6 ha farmstead with hsg A The flow path consist of : 30 meters sheet at m/m slope over light woods (0.40); 415 meters shallow concentrated at m/m slope over unpaved surface and 83 meters shallow concentrated at m/m slope over unpaved surface Basin C: 5 ha woods in good condition with hsg B

4 4 of 5 The flow path consist of : 30 meters sheet at m/m slope over dense woods (0.80); 215 meters shallow concentrated at m/m slope over unpaved surface 17. What is the existing peak discharge rate during the 25-year, 24-hour storm event? Assume the NRCC_B rainfall distribution for Saratoga County East.. a cms b cms c cms d cms 18. What time did the peak discharge rate occur for existing Basin B during the 25-year, 24-hour storm event? a hr b hr c hr d hr 19. For Grant Estates, what is the time of concentration for the existing Basin C? a hr b hr c hr d hr 20. The developed Grant Estates site will have the following characteristics: Basin A: 19ha 0.10 ha lots residential subdivision hsg A 12ha 0.10 ha lots residential subdivision hsg B Tc = 0.250hr Basin B: 5 ha woods in good condition with hsg B Tc = 0.371hr Basins A and B flow to a single pond. Pond: area at spillway crest = 1.4 ha area at 2 meters above spillway crest = 1.7 ha Outfall Pipes tested 762mm, 914mm and 1067mm diameters Spillway height is 2 meters above pipe invert What is the weighted CN for the Grant Estates proposed Basin A? a. 65 b. 66 c. 64 d For Grant Estates developed condition, what is the maximum commonly available diameter pipe needed to assure attenuation of the peak discharge rate to no greater than the pre-developed rate for the 25-year, 24-hour storm event? a. 914mm b. 1067mm c. 762mm d. 610mm 22. What is the peak stage in the developed Grant Estates Basin A during the 50-year, 24-hour storm event? Assume the same diameter outfall pipe as determined in problem 21 above.

5 5 of 5 a. 0.50m b. 0.75m c. 0.15m d. 0.32m 23. A WinTR-55 reach cross section is either a rectangular, triangular or trapezoidal channel. 24. Which of the following does not apply to the Structure Data window? a. The Structure Data window allows data entry and editing for the pond s surface area, structure outlet type and dimensions, and structure rating relationship for a structure. b. Four outlet sizes may be entered for any structure. c. The first eight characters in structure names must be unique in each file. d. The entry of a zero weir length indicates a v-notch weir. 25. Which of the following applies to the WinTR-55 processes associated with running this program? a. The Hydrograph Peak/Peak Time table will be displayed in the File Display window following a successful run. b. If the Error file appears in the File Display window, indicating an unsuccessful run, the data errors must be resolved prior to attempting another run. c. Green text indicates a computed value while blue text indicates a value that was entered directly. d. All of the above.