Runoff Data Gather-1

The Stormwater Control Measure (SCM) behind McMichael Science Center is 140ft long, 50ft wide, and has an average depth to the overflow riser of 3ft. The SCM was designed to capture the first 1 inch of rainfall flowing off the impervious surfaces in the watershed. What is the total surface area of watershed that flows to this SCM? (Hint: you can calculate the total volume of water in the SCM, then use that volume of water and the depth of rainfall to calculate the area of the watershed)

Design a pond for treating leachate from a sanitary landfill having an area of 5000 square meters if the runoff coefficient is 0.40 and effective rainfall is 60 mm/hr. The receiving body of water is Class B. Assume appropriate design data.

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|Q4|// |A]: For a small drainage area, the infiltration rate at the start of rainfall storm was record to be 90 mm/hr and declined exponentially to a constant rate of 8 mm/hr after 2.5 hr. The total infiltration during 2.5 hr was 50 mm. Develop the Horton's equation for the infiltration rate at any time t< 2.5 hr. [B]: Find the required discharge of irrigation water at the headwork of the distiriburatry, if the gross area is 20000 mishara, the irrigation intensity is 65%, and the water duty is 1600 hectare/m/sec.

Determine the required area (in ft ) of a bioretention basin to service runoff from a shopping complex with 4   .2 acres of paved parking,   1.1 acre of sidewalks,   0.5 acre of landscaping.   The 24-hr design storm is 1 inch. Use the empirical coefficients in Small Storm Hydrology method. There is no underdrain pipe for the bioretention basin. Use the following guidelines for the design:   Ponding depth = 12 inch   Media bed: 36 inches deep, porosity = 0.30   Gravel bed: 24 inches deep, porosity = 0.36

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Which one of these processes is considered losses in the sub - surface flow ? A- Groundwater flow. B- Runoff. C- Infiltration. D- Sub surface outflow. What is the correct answer?? C-

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Sketch and label a complete process Of water SUpply system for Suiface water- State the main purpose of having this type of Plant

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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 tabletop

Discuss three factors that could affect evaporation rates

Why is the vacuum well-point dewatering system expected to withdraw a greater quantity of groundwater than the conventional well-point dewatering system?

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A 100-acre watershed that is 80% Industrial and 20% newly graded areas (no vegetation). The watershed has soil group B. Determine the runoff volume for 10-year, 24-hr rainfall event (use the IDF below) RAINFALL INTENSITY IN INCHES PER HOUR 20.0 15.0 10.0 8.0 6.0 4.0 0.8 X 0.2 0.1 0.08 0.06 0.04 0.02 II ப____ lud 6 VDOT B, D & E eqn. except for 1-year 10 NOAA Atlas 14 Vienna/Tysons for 1-year 15 20 MINUTES 30 RETURN 40 50 60 EN PERIOD (YEARS) 25 10 DURATION NOAA Atlas 14 Vienna/Tysons 2 3 4 5 6 HOURS 8 10 12 18 24 -

Assuming a drawdowntime of 40 hrs and coefficient of permeabilityof 2 in/hr, determine the dimensions of the bioretention.

The infiltration capacity of an area in Universiti Tun Hussein Onn Malaysia at 0.25 hour interval of time are indicated in TABLE Q2(b). Formulate an equation for the infiltration capacity in the exponential form. (b)

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3. A 5-acre apartment complex receives 1.25 in./hr. of rain for 6 hours. During the storm event, 0.1 in/hr. of water evaporates, and a volume of 15 acre-inches accumulates on the lot. The rest leaves the lot as runoff. Assume that there is no infiltration in this scenario. a. Using a water balance, determine the total volume of runoff generated by the storm. b. Calculate the runoff coefficient.

Find the runoff values,

If the ratio between the length of the tape to its width is 45, the number of tapes used to irrigate a field 300 tapes, the irrigation time per tape is 55 minutes, irrigation current is 30L / sec, calculate the length of the tape and the design flow rate in units of M '/ hr if you know that the irrigation efficiency is% 70, the effective root zone depth is 1.5 m, the moisture depletion rate is 60%, and the water holding capacity is 1.3 mm / cm. and the available

Given the rainfall excess hyetograph and the 1-hr UH below:   Time (hr) 0 1 2 3 4 5 6 7 8 Excess rainfall (in) 1 2 1 0.5           Direct runoff (cfs) 0 100 200 400 300 200 100 50 0   Compute the resulting storm hydrograph and assume no losses to infiltration and evapotranspiration

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H.W: Design a sedimentation tank to be treat 0.10 m³/sec

A Palm Spring golf course has requested a permit to install a 40000 ft2 pond to enhance the beauty of its facilities. Since the evaporation rates are very high in Palm Springs, it is likely they will need to pump a lot of groundwater to keep the pond full. The city has hired you (a water resources engineer) to determine how much water needs to be pumped per year in order to keep the pond filled. There is a small creek that discharges an average of 0.25 m3/s into the pond. The outlet valve from the pond releases an average rate of 0.30 m3/s (to keep the pond from getting stagnant). Precipitation on the pond is 260 mm/year, and the annual evaporation is estimated to be 105 inches/year. The pond will be lined with concrete to prevent any drainage or seepage from the bottom. Using a water balance, what volume (on average) of groundwater (in cubic meters) must be added to the lake each year to keep the pond at a constant level? Draw a schematic of the problem to identify the control volume…

Design a suitable rectangular sedimentation tank provided with mechanical cleaning equipment for treating the sewage from a city, provided with an assured public water supply system, with a max daily demand of 31 million lit/day. Assume suitable values of detention period and velocity of flow in the tank. Make any other assumptions, wherever needed.

Design a detention pond for Lawrence Tech’s “Science Parking Lot” utilizing Oakland County Design Standards that minimize a loss of parking spots (estimate parking spaces lost). A complete construction grading plan is unnecessary but the volumetric relationships should be clear. You can utilize the existing pipe network drainage systems (no need to design a new pipe network) and you should assume the parking lot surface is at 668-ft and an outfall elevation at the river of 650-ft. Only focus on the pond size, shape, and outlet design. Submit very clean and annotated calculations and drawings. Drawings don’t have to be in AutoCAD but hand drawings (or other software) need to be clean and easy to interpret. Make sure you refer to County Standards for all critical design elements including side slope, riser requirements, etc.