Question

The flow hydrograph ordinates observed in a basin with a precipitation area of 500 km2 for a
3-hour showers are given in the table below. Assuming the base flow is constant and 10
m3/h;

a) Calculate the total volume of flow as m3, which consists of precipitation.
b) Calculate excess rainfall height and duration.
c) Determine the unit hydrograph which is equal to the precipitation period of excess
rainfall.

(time is given a hour 10m3/h ) not false..

Time (h)	0	1	2	3	6	9	12	15	18	21	24	27	30
Discharge (m3/s)	10	10	10	110	180	150	130	112	96	82	70	60	52
Rainfall (cm)	0	1	3.5	4.5
Time (h)	33	36	39	42	45	48	51	54	57	60	63	66
Discharge (m3/s)	44	37	32	28	24	22	19	17	15	13	12	10

Answer 1