i = Intensity of rainfall (in inches per hour)
Q = (0.0104)ciA (in gallons per minute)
(1/96)ciA
Where: Q = Runoff (in gallons per minute)
c = Coefficient of runoff (a dimensionless number)
i = Intensity of rainfall (in inches per hour)
A = Drainage area (in square feet)
A-382.36 (4)-2. RUNOFF COEFFICIENTS. Tables Detail A and B are for using the rational formula.
Source: Wisconsin department of transportation (WDOT), Facilities Development Manual (July 2, 1979), Procedure 13-10-5.
Source: Wisconsin department of transportation (WDOT), Facilities Development Manual (July 2, 1979), Procedure 13-10-5.
Note: The lower “C” values in each range should be used with the relatively low intensities associated with 2- to 10-year design recurrence intervals whereas the higher “C” values should be used for intensities associated with the longer 25- to 100-year design recurrence intervals.
Note: In parking lot runoff, visible sheen has been accepted as having an oil concentration of 15 mg/L.
A-382.36 (4)-3. OTHER METHODS OR MODELS. A model that calculates peak flow such as TR-55, P8 or an equivalent methodology may be used.
Information on how to access P8 is available at the department of natural resources webpage:
http://dnr.wi.gov/runoff/models/ or contact the stormwater coordinator in the runoff management section of the bureau of watershed management at the department of natural resources at phone 608-267-7694.
A simplified TR-55 approach, TR-55 (210-vf-TR-55, second edition, June 1986), may be obtained by accessing the USDA NRCS webpage:
http://dnr.wi.gov/runoff/models/.
A-382.36 (6)-1. THE FORMULA FOR SOLVING FOR DIAMETER, D FOR ROOF CONDUCTORS.
A-382.36 (9) (b) AREA DRAIN INLETS.
A-382.36 (9) (b) 3. INLET GRATES.
GRATES FOR HORIZONTAL PIPING
GRATES FOR VERTICAL PIPING
FORMULA TO CALCULATE CAPACITY, IN CUBIC FEET PER SECOND:
Q = 2/3 A C (2gh)1/2
Where: Q = the capacity of the inlet, cfs
2/3 = a factor to correct for assumed blockage of 1/3 of the inlet's net open area
A = the net open area of the inlet, sq. ft
C = an orifice coefficient, usually taken as 0.60
G = a constant, 32.2 ft/sec/sec
H = the head, in feet on the inlet, or the depth of water on top of the inlet, usually not more than two or three inches.
A-382.365 (1) CLASS V INJECTION WELLS. An injection well is described as being any well, drilled or dug hole, used to inject fluids into the subsoil. A stormwater collection well may be a class V injection well.
Federal regulations (
40 CFR 144.26) require that all injection wells be reported to the state underground injection control (UIC) program authority for the purpose of developing a state inventory of injection practices. In Wisconsin, the department of natural resources, bureau of drinking water and groundwater, maintains this inventory and registration program, form 3300-253. For more information, refer to
www.dnr.state.wi.us/.
A-382.37 (3) CAMPSITE RECEPTORS AND WATER SUPPLY
A-382.40 (4) CONTROL VALVES.
A-382.40 (7) (a) METHODOLOGY.
Where equipment such as an instantaneous or tankless water heater, water treatment device, water meter, and backflow preventer is provided in the design, the friction loss in such equipment, corresponding to the GPM demand, should be determined from the manufacturer or other reliable source.
Where a direct fired pressurized tank type water heater is provided in the design, the friction loss for such equipment can be assumed as part of the pressure losses due to flow through piping, fittings, valves and other plumbing appurtenances when the developed length of piping is multiplied by 1.5.
The pressure losses due to flow friction through displacement type cold-water meters may be calculated from Graph A-382.40 (7)-1.
Graph A-382.40 (7)-1
PRESSURE LOSS IN COLD-WATER METERS, DISPLACEMENT TYPE
Graph A-382.40 (7)-2
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: Copper Tube-Type K, ASTM B88; (C = 150)
Graph A-382.40 (7)-3
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: Copper Tube-Type L, ASTM B88; (C = 150)
Graph A-382.40 (7)-4
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: Galvanized Steel Pipe-Schedule 40, ASTM A53, ASTM A120; (C = 125)
Graph A-382.40 (7)-5
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: Polybutylene Tubing, ASTM D3309; or CPVC Tubing, ASTM D2846; (C = 150)
Graph A-382.40 (7)-6
PRESSURE LOSSES DUE TO FLOW FRICTION
Graph A-382.40 (7)-7
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: Polyethylene Tubing, Copper Tube Size, ASTM D2737; (C = 150)
Graph A-382.40 (7)-8
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: ABS Pipe-Schedule 40; ASTM D1527; or
CPVC Pipe-Schedule 40; ASTM F441; or
PE Pipe-Schedule 40; ASTM D2104; ASTM D2447; or
PVC Pipe-Schedule 40; ASTM D1785; ASTM D2672; (C =150)
Graph A-382.40 (7)-9
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: Copper Tube-Type M, ASTM B88; (C = 150)
Graph A-382.40 (7)-10
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: Polyethylene Aluminum Polyethylene Tubing (PexAlPex), ASTM F1281; (C = 150)
Graph A-382.40 (7)-11
PRESSURE LOSSES DUE TO FLOW FRICTION
Material: CPVC Tubing, SDR 13.5; ASTM F442; (C = 150)
