---
title: "Discharge of Jhiku khola from stream gauging data"
subject: "Engineering Hydrology"
chapter: 4
key: "semester_5/engineering_hydrology:current-meter-jhiku-khola"
source: https://www.bctengineer.com/q/semester_5/engineering_hydrology/current-meter-jhiku-khola
site: BCT Engineering
---

# Discharge of Jhiku khola from stream gauging data

Engineering Hydrology · Chapter 4: Surface Runoff

- Asked in: 2081 Baisakh, 8 marks
- Answer checked by Claude Sonnet 5.5 on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/engineering_hydrology/current-meter-jhiku-khola
- Whole chapter: https://www.bctengineer.com/md/semester_5/engineering_hydrology/chapter-4

## Question

Following data is the discharge measurement of Jhiku khola using stream gauging, compute the discharge of Jhiku khola.

| Distance from left bank (m) | Depth (m) | Velocity at 0.2d (m/s) | Velocity at 0.8d (m/s) |
|---|---|---|---|
| 0 | - | - | - |
| 1.5 | 1.1 | 0.7 | 0.42 |
| 3.0 | 2.7 | 0.85 | 0.63 |
| 5.0 | 1.9 | 0.75 | 0.54 |
| 7.5 | 0.9 | 0.65 | 0.46 |
| 10.0 | 0.5 | 0.45 | 0.35 |
| 12.5 | - | - | - |

## Short answer

Mid-section method: mean velocity v_m = (v_0.2 + v_0.8)/2 for each vertical, then q = v_m × depth × segment width. Summed across all strips, discharge Q ≈ 8.93 m³/s.

## Answer

**Mid-section method** with the mean velocity of each vertical $v_m=(v_{0.2}+v_{0.8})/2$:
$$
q_i=v_m\,d\,\frac{b_{i+1}-b_{i-1}}{2}
$$
The two banks (0 m and 12.5 m) have zero depth.

| x (m) | d (m) | $v_{0.2}$ | $v_{0.8}$ | $v_m$ (m/s) | w (m) | Area (m$^2$) | q (m$^3$/s) |
|---|---|---|---|---|---|---|---|
| 1.5 | 1.1 | 0.7 | 0.42 | 0.560 | 1.5 | 1.650 | 0.924 |
| 3 | 2.7 | 0.85 | 0.63 | 0.740 | 1.75 | 4.725 | 3.497 |
| 5 | 1.9 | 0.75 | 0.54 | 0.645 | 2.25 | 4.275 | 2.757 |
| 7.5 | 0.9 | 0.65 | 0.46 | 0.555 | 2.5 | 2.250 | 1.249 |
| 10 | 0.5 | 0.45 | 0.35 | 0.400 | 2.5 | 1.250 | 0.500 |
| **Total** | | | | | | **14.150** | **8.927** |

Mean velocity $= 0.631$ m/s.

**Answer: Discharge of Jhiku Khola $Q \approx 8.93\ \text{m}^3/\text{s}$.**

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. How is the mean velocity at the 3.0 m vertical computed?
   A. 0.85 x 0.63
   B. (0.85 + 0.63)/2 = 0.74 m/s
   C. 0.63 m/s
   D. 0.85 + 0.63
   Answer: B. Average of the 0.2 d and 0.8 d readings. (Key point: Mean velocity)

2. What width applies at x = 7.5 m (neighbours at 5.0 and 10.0)?
   A. 5 m
   B. 2.0 m
   C. 2.5 m
   D. 1.25 m
   Answer: C. (10.0 - 5.0)/2 = 2.5 m. (Key point: Strip width)

3. What is the discharge?
   A. About 14.15 m^3/s
   B. About 0.631 m^3/s
   C. About 3.50 m^3/s
   D. About 8.93 m^3/s
   Answer: D. The sum of partial discharges is 8.927 m^3/s with area 14.15 m^2. (Key point: Result)

## Related in Engineering Hydrology

- [Discharge from current meter at 0.6d, stream gauging data](https://www.bctengineer.com/question.md?key=semester_5%2Fengineering_hydrology%3Acurrent-meter-0-32n-0-032-2) — Engineering Hydrology, chapter 4
- [Discharge of Nakhu Khola from current meter data](https://www.bctengineer.com/question.md?key=semester_5%2Fengineering_hydrology%3Acurrent-meter-nakhu-khola) — Engineering Hydrology, chapter 4
- [Mid-section discharge with 0.2d, 0.6d, 0.8d velocities](https://www.bctengineer.com/question.md?key=semester_5%2Fengineering_hydrology%3Amidsection-area-velocity-three-point) — Engineering Hydrology, chapter 4
- [Discharge from current meter at 0.6 depth](https://www.bctengineer.com/question.md?key=semester_5%2Fengineering_hydrology%3Acurrent-meter-0-32n-0-032) — Engineering Hydrology, chapter 4
- [Discharge from multi-point current meter data](https://www.bctengineer.com/question.md?key=semester_5%2Fengineering_hydrology%3Acurrent-meter-two-point-0-3n) — Engineering Hydrology, chapter 4
- [Stream flow from current meter data](https://www.bctengineer.com/question.md?key=semester_5%2Fengineering_hydrology%3Acurrent-meter-0-035-0-74n) — Engineering Hydrology, chapter 4, asked 2×

## Related in other subjects

- [Discharge from 0.2d and 0.8d velocities (left bank)](https://www.bctengineer.com/question.md?key=semester_6%2Fhydro_power%3Astream-gauging-left-bank) — Hydro Power, chapter 2
- [Discharge from 0.2d and 0.8d velocities (right bank)](https://www.bctengineer.com/question.md?key=semester_6%2Fhydro_power%3Astream-gauging-right-bank) — Hydro Power, chapter 2
- [Stream flow from 0.2d and 0.8d measurements](https://www.bctengineer.com/question.md?key=semester_6%2Fhydro_power%3Astream-flow-measurement-data) — Hydro Power, chapter 2
- [Discharge from depth and mean velocity data](https://www.bctengineer.com/question.md?key=semester_6%2Fhydro_power%3Adischarge-depth-mean-velocity) — Hydro Power, chapter 2