📌 Purpose of the Code:
This function determines how much the flow 🌊 spreads across a street's cross-section using equations from HEC-22 based on Izzard's form of the Manning equation.
📂 Inputs:
Q
: 🚰 Represents the flow rate in the conduit (measured in cfs, or cubic feet per second).
📂 Output:
- Returns 📤 the width of the flow spread across the street (measured in feet).
🔍 Detailed Breakdown:
1️⃣ Initial Setup:
- The function starts by setting
f
toQfactor
, which seems to be a constant derived from the Manning equation 📖 and the geometry of the conduit.
2️⃣ No Depressed Curb:
- If the value of
a
(seems to represent the depressed curb) is zero, the function calculates the spread of flowTs1
using a formula from HEC-22 📝.
3️⃣ Depressed Curb Exists:
If there's a depressed curb (i.e.,
a
is non-zero):a. The function first checks if the spread is within the curb width
W
. It does this using another formula.b. If the spread
Tw
is less than or equal toW
, thenTs1
is set toTw
.c. If the spread extends beyond the curb width, it goes into a loop ⭕ (for a maximum of 10 iterations) to refine the spread's estimate using another set of HEC-22 equations. The loop keeps refining the estimate until the difference between two successive estimates is very small (less than 0.01).
4️⃣ Final Result:
- The function returns 📤 the final estimated spread, but ensures it doesn't exceed
Tcrown
(probably the maximum spread possible).
📝 Summary: This function calculates how much water 🌊 flows across a street given the flow rate in a conduit. It uses specific formulas from HEC-22 and considers street geometry, especially the presence of a depressed curb. By determining the flow spread, it helps in understanding how water distributes across the street during events like rainfall 🌧️ or flooding 🌊.
Hope this emoji-laden explanation helps you grasp the essence of the code better! 🌟🥳📚
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