Define hydrograph and unit hydrograph. A community wants you to make a hydro-ecological investigation of a 29
Question:
Define hydrograph and unit hydrograph. A community wants you to make a hydro-ecological investigation of a 29 large catchment area with possibilities for improving the ecology by designing for example
wetlands. The below hydrograph (total runoff in m3 /s every hour)
from a 33.98cm rainfall that fell during 60 min was observed. • Using this information decide
the following
• a) How large was the base flow?
• b) How much was the direct runoff in m3?
• c) What was the effective rainfall in mm?
• d) How large was the losses in mm?
• e) How large was the runoff coefficient?
f) What was the water balance for this rainfall event?
g) What does the unit hydrograph look like?
h) What will the hydrograph look like for the total runoff from a
design rainfall of 50 mm during 60 min?
i) If another 100-mm rain will fall during the next 60 min, what
will the hydrograph look like for this total runoff?
Hydrology and Floodplain Analysis
ISBN: 978-0132567961
5th edition
Authors: Philip B. Bedient, Wayne C. Huber, Baxter E. Vieux