1. What is Base Length In SCS Triangular Unit Hydrograph?

Base Length in SCS Triangular Unit Hydrograph is a popular method used in watershed development activities, especially in small watersheds. It represents the total duration of direct runoff from a rainfall event.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T_b \) — Base Length (Meter)
• \( T_p \) — Time of Peak (Hour)

Explanation: The equation calculates the base length by multiplying the time of peak by a constant factor of 2.67 as defined in the SCS Triangular Unit Hydrograph method.

3. Importance of Base Length Calculation

Details: Accurate base length calculation is crucial for watershed modeling, flood prediction, and designing appropriate drainage systems in small watershed development projects.

4. Using the Calculator

Tips: Enter time of peak in hours. The value must be valid (greater than 0).

5. Frequently Asked Questions (FAQ)

Q1: What is the SCS Triangular Unit Hydrograph method?
A: It's a simplified approach developed by the Soil Conservation Service (now NRCS) to model rainfall-runoff relationships in small watersheds using a triangular-shaped hydrograph.

Q2: Why is the constant 2.67 used in the formula?
A: The factor 2.67 is derived from empirical studies and represents the ratio of base length to time of peak in the triangular hydrograph model.

Q3: What are typical values for time of peak?
A: Time of peak varies based on watershed characteristics but typically ranges from 1-24 hours for small watersheds.

Q4: Are there limitations to this method?
A: Yes, it's primarily designed for small watersheds and may not accurately represent complex hydrological systems or large watersheds.

Q5: How is this calculation used in practice?
A: It's used in hydraulic engineering for designing drainage systems, flood control structures, and in watershed management planning.