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The water shed at a site has 77000 hectares.the mean annual precipitation at this place is 950 mm. If 25% of annual rain fall reaches the basin outlet as stream flow ,estimate the mean annual flow rate of the stream in m^3/sec?
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The water shed at a site has 77000 hectares.the mean annual precipitat...
Estimating the Mean Annual Flow Rate of a Stream

Given Data:
- Watershed area: 77000 hectares
- Mean annual precipitation: 950 mm
- Percentage of annual rainfall reaching the basin outlet as stream flow: 25%

Step 1: Convert Watershed Area to square meters
- 1 hectare = 10000 square meters
- Therefore, the watershed area in square meters = 77000 hectares x 10000 square meters/hectare
- Watershed area = 770000000 square meters

Step 2: Convert Mean Annual Precipitation to meters
- 1 mm = 0.001 meters
- Therefore, the mean annual precipitation in meters = 950 mm x 0.001 meters/mm
- Mean annual precipitation = 0.95 meters

Step 3: Calculate the Annual Volume of Rainfall
- The annual volume of rainfall = Watershed area x Mean annual precipitation
- Annual volume of rainfall = 770000000 square meters x 0.95 meters
- Annual volume of rainfall = 731500000 cubic meters

Step 4: Calculate the Mean Annual Stream Flow
- The mean annual stream flow = Percentage of annual rainfall reaching the basin outlet x Annual volume of rainfall
- Mean annual stream flow = 0.25 x 731500000 cubic meters
- Mean annual stream flow = 182875000 cubic meters

Step 5: Convert Mean Annual Stream Flow to cubic meters per second
- The mean annual flow rate of the stream in cubic meters per second = Mean annual stream flow / 365 days / 24 hours / 3600 seconds
- Mean annual flow rate = 182875000 cubic meters / 365 days / 24 hours / 3600 seconds
- Mean annual flow rate = 5.8 cubic meters per second

Summary:
The mean annual flow rate of the stream is estimated to be 5.8 cubic meters per second based on the given data. This calculation is done by converting the watershed area to square meters, converting the mean annual precipitation to meters, calculating the annual volume of rainfall, and then applying the percentage of rainfall reaching the basin outlet. Finally, the mean annual flow rate is converted to cubic meters per second.
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The water shed at a site has 77000 hectares.the mean annual precipitation at this place is 950 mm. If 25% of annual rain fall reaches the basin outlet as stream flow ,estimate the mean annual flow rate of the stream in m^3/sec?
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