To do this, we simply multiply across each row. The runoff, Q, for the roof area in drainage Zone A is: (1.00 x 1.5 x 500) / 96.23 = 7.79 gallons per minute. |
This formula can help us calculate peak run off rate for capture and conveyance of water as well as calculating runoff rate for retention/detention volume. |
1 DFU = 1 cubic foot of water drained through a 1 1/4" diameter pipe in one minute. (1 ft³ /min water drained through a 1 1/4" diameter pipe). 1 DFU ≈ ( ... |
Hooghoudt's equation · Q = steady state drainage discharge rate (m/day) · Ka = hydraulic conductivity of the soil above drain level (m/day) · Kb = hydraulic ... |
It is noted, that for steady-state flow conditions the drain discharge q is equal to the recharge (rainfall) rate R, shown in Fig. 1. For later use, the ... |
Appendix 9: Drainage Calculations. Page 2. Page 3. Hydraulic Calculation (Discharge Capacity of Drainage Facilities)（1/3） γ. （mm/h）. (m2). （C）. （m3/s）. ◇. 1. |
Drainage Intensity (in/day or cm/day) is calculated by the Hooghoudt equation and is dependent on the effective saturated hydraulic conductivity of the soil ... |
30 мая 2019 г. · The rational method equation is used to calculate the peak discharge for facilities serving a drainage area less than 200 acres. The runoff ... |
Take the roof's total square footage and divide by the total square footage handled by one drain. The result is the number of drains needed. For example ... |
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