A coastal watershed has a total surface area of 387 km^2 The land area is 381 km

Question

A coastal watershed has a total surface area of 387 km^2 The land area is 381 km^2 and the area of the rivers is 6 km^2. A water budget for the watershed has the following long-term average annual values (all rounded to the nearest integer): precipitation: 80 cm baseflow: 13 cm evapotranspiration: 49 cm stream flow: 21 cm runoff: 8 cm ocean seepage: 10 cm ALL values are normalized, meaning they represent the depth of water if spread out over the entire 387 km^2 area. For all questions below, assume there are no long-term changes in storage. A. Prepare an annual water budget for the entire watershed, listing inputs in one column and outputs in a second column. Give a total for each column. B. Prepare an annual water budget for the streams. c. Prepare an annual water budget for the groundwater reservoir. D. What is the total volume of water recharged to the groundwater each year? (report as m^3) E. What is the average discharge from the watershed through stream outflow? (report as m^3/s) Answer number 4 on this page. Show any work for the tables on the right side.

Explanation / Answer

The basic equation to express a water budget for a catchment area is

Inputs = Outputs + change in storage

Since it was said to assume that there are no long-term changes in the storage, We can say

Inputs = Outputs

A) Annual water budget for entire watershed

B) Annual water budget for streams

C) Annual Water budget for Ground water reservoir

Note: "-ve" sign is considered because they are computed as LOSSES

D. Total volume of water recharged to the ground water each year = 23cm x 387km2 = (23 x 10-2)m x (387 x (103m)2)

which will be 89010000 m3

Inputs Outputs Precipitation = 80cm Evapotranspiration = 49cm Baseflow = 13cm Runoff = 8cm Ocean seepage = 10cm Total = 80cm Tota = 80cm

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