A biofiltration swale is to be laid on a 2% slope to handle a design peak runoff rate equal to 0.002 m³/s. During the wet season, the swale is expected to be covered with grass having an average height of 100 mm and Class E retardance. Design the swale.
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- A stream size of 150 lit/sec was released from the diversion headwork to irrigate a land of area 1-8 hectare. The stream size when measured at the delivery to the field channels is 120 lit/sec. The stream was continued for 8 hours. The effective root zone depth is 1.80 m. The application losses in the field are estimated to be 440 m³. The depth of water penetration was 1-80 m and 1-20 m at the head and tail of the run respectively. The available water holding capacity of the soil is 21 cm/m and irrigation was done at 60% depletion of available moisture (A). Find conveyance efficiency (EJ), water application efficiency (Ea), water storage efficiency (E) and water distribution efficiency (Ed). The stream size delivered to the plot was 100 lit/sec.A stream of 135 L/s was diverted from a canal and 100 L/s were delivered to the field. An area of 1.6hectares was irrigated in 8 hours. The effective depth of root zone was 1.8 m. the runoff loss in the fieldwas 432 m3. The depth of water penetration varied linearly from 1.8 m at the head end of the field to1.2 m at the tail end. Available moisture holding capacity of the soil is 20 cm per meter depth of soil.Irrigation was started at a moisture extraction level of 50 percent of the available moisture. Determine;a. The water conveyance efficiencyb. The water application efficiencyc. The water storage efficiencyd. The water distribution efficiencyQ10) Calculate the efficiency of water application if a watercourse of 0.085 m3/sec was supplied to a field for two hours, the averaged amount of runoff averaged 0.04 m3sec for one hour, and depth of root zone depth is 1.5m. Assume there no evaporation losses has been occur. None of the above 23.5 % O 25 % 76.5 %
- Answer these both questions a. The total observed runoff volume during a 4 hr storm with uniform intensity of 2.8cm/hr is 25.2 x106 m3 from basin of 280km2 area. What is the average infiltration rate for the area. b. A volume of 3x106 m3 of groundwater was pumped out from unconfined aquifer uniformly over an area of 5 km2. The pumping lowered the water table from 102 to 99m. The specific yield of the aquifer is?О. No. 03; A stream of 135 L/s was diverted from a canal and 100 L/s were delivered to the field. An area of 1.6 hectares was irrigated in 8 hours. The effective depth of root zone was 1.8 m. the runoff loss in the field was 432 m3. The depth of water penetration varied linearly from 1.8 m at the head end of the field to 1.2 m at the tail end. Available moisture holding capacity of the soil is 20 cm per meter depth of soil. Irrigation was started at a moisture extraction level of 50 percent of the available moisture. Determine; The water conveyance efficiency b. The water application efficiency The water storage efficiency d. The water distribution efficiency а. с.A stream size of 150 lit./sec was released from the diversion headwork to irrigate a land of area 1.8 hectares. The stream size when measured at the delivery to the field channels is 120lit/sec. The stream continued for 8h hours. The effective root zone depth is 1.80m. The application losses in the field are estimated to be 440m. The depth of water penetration was 1.80m and 1.20m at the head and tail of the run respectively. The available water holding capacity of the soil is 21cm/m and irrigation was done at 60% depletion of A.M. Find Ec, Ef, Ea, Es and Ed. The stream size delivered to the plot was 100 lit./sec. Solution
- Rational Method: Determine the pre (C = 0.3) and post development (C= 0.75) peak runoff for a 90-acre site that experiences a 0.35 inches/hour rainfall intensity, using the rational method. Show all your work, including any assumptions you will make.Which surface is likely to have the highest value of runoff detention storage? Group of answer choices a) A steeply sloped concrete parking lot b) A pitched roof c) A flat roof d) A glass tabletopProblem 4.3. By rational method, determine the design peak runoff for a 50-year return period. The watershed consists of 50-ha (120-ac), one third in rotation meadow and the remainder on row crops on the contour. The hydrologic soil group is B and the time of concentration is 30 min. The watershed is at your present location.
- a) Calculate the peak runoff rate of the watershed whose area is 600 ha & the rainfall intensity is given 2.5cm/hr. Take Runoff coefficient C = 0.18The section of a canal begins at the progressive 0 + 000 with the bottom level 210.50 meters above sea level and ends at the progressive 4 + 000 with the level 207.30 meters above sea level, crossing a ML-CL type soil to irrigate an area of 2000 hectares, with an irrigation module 1.20 Its / s / ha. Determine the tie and template respectively for a section with minimal infiltration. Consider the maximum recommended speed depending on the characteristics of the soils.Design a 4:1 trapezoidal shaped vegetated waterway for a field in Sangamon County, Illinois for the given condition. The highest rainfall occurs during growing season after several days of dry period (antecedent rainfall condition is I). Hydrologic soil group is B. The grass waterway is designed to carry peak runoff rate from a 100-ha watershed, which has row crops on terraced lands with poor hydrologic condition, maximum length of flow is 500 m, and average watershed slope is 3%. The soils are highly erodible, and the waterway slope is about 4.5%. The vegetation is usually mowed (retardance group D), but the waterway should have adequate capacity when the grass is tall (retardance group B). Design for both cases. Provide final dimensions of top width, depth, and bottom width of the waterway. If any data is missing, make reasonable assumptions. (1) Estimate the peak runoff rate by the SCS TR-55 method from information provided above. Make reasonable assumptions, if any. (2) Follow the…