Question

Covert from a 15 minute UH to a 1hr UH

Time (Minutes)	Discharge (m3/s)
0	0
5	0.1611
10	0.525067
15	0.978533
20	1.11875
25	1.0024
30	0.76075
35	0.47435
40	0.31325
45	0.2148
50	0.1432
55	0.095467
60	0.06265
65	0.041767
70	0.02685
75	0.0179
80	0.011933
85	0.00895
90	0.005967
95	0.002983
100	0

Then construct Storm Hydro graph using the following rainfall excess

Time (Hrs)	Rainfall excess (mm)
1	0
2	0
3	0
4	0
5	1.929
6	6.196
7	6.352
8	6.121
9	9.271
10	9.811
11	12.619
12	12.061
13	10.21
14	7.282
15	5.569
16	4.522
17	7.138
18	13.462
19	12.514
20	7.639
21	8.998
22	6.733
23	5.941
24	8.632

Answer 1

QUE1

for column 5 after legging 15min unit. hydrograph with 1cm excess rainfall it will give after superposition 4cm excess rainfall, so be divided it by 4 to obtained column 6  

	column1	column2	column3	column4	column5	column6
Time (Minutes)	Discharge (m3/s)	30min UH	45min UH	60min UH	1hr UH WITH 4CM EXCESS RAINFALL	1HR UH WITH 1CM RAINFALL
0	0				0	0
5	0.1611				0.1611	0.040275
10	0.525067				0.525067	0.13126675
15	0.978533	0			0.978533	0.24463325
20	1.11875	0.1611			1.27985	0.3199625
25	1.0024	0.525067			1.527467	0.38186675
30	0.76075	0.978533	0		1.739283	0.43482075
35	0.47435	1.11875	0.1611		1.7542	0.43855
40	0.31325	1.0024	0.525067		1.840717	0.46017925
45	0.2148	0.76075	0.978533	0	1.954083	0.48852075
50	0.1432	0.47435	1.11875	0.1611	1.8974	0.47435
55	0.095467	0.31325	1.0024	0.525067	1.936184	0.484046
60	0.06265	0.2148	0.76075	0.978533	2.016733	0.50418325
65	0.041767	0.1432	0.47435	1.11875	1.778067	0.44451675
70	0.02685	0.095467	0.31325	1.0024	1.437967	0.35949175
75	0.0179	0.06265	0.2148	0.76075	1.0561	0.264025
80	0.011933	0.041767	0.1432	0.47435	0.67125	0.1678125
85	0.00895	0.02685	0.095467	0.31325	0.444517	0.11112925
90	0.005967	0.0179	0.06265	0.2148	0.301317	0.07532925
95	0.002983	0.011933	0.041767	0.1432	0.199883	0.04997075
100	0	0.00895	0.02685	0.095467	0.131267	0.03281675
		0.005967	0.0179	0.06265	0.086517	0.02162925
		0.002983	0.011933	0.041767	0.056683	0.01417075
		0	0.00895	0.02685	0.0358	0.00895
			0.005967	0.0179	0.023867	0.00596675
			0.002983	0.011933	0.014916	0.003729
			0	0.00895	0.00895	0.0022375
				0.005967	0.005967	0.00149175
				0.002983	0.002983	0.00074575
				0	0	0

QUE 2 Assumed base flow is 10 cumec/sec

Time (Hrs)	Rainfall excess (mm)	Rainfall excess in cm	1HR UH	DRH = RAINFALL EXCESS* UH	Flood hydrograph=DRH+BASE FLOW
1	0	0	0	0	10
2	0	0	0.040275	0	10
3	0	0	0.13126675	0	10
4	0	0	0.24463325	0	10
5	1.929	0.1929	0.3199625	0.061720766	10.06172077
6	6.196	0.6196	0.38186675	0.236604638	10.23660464
7	6.352	0.6352	0.43482075	0.27619814	10.27619814
8	6.121	0.6121	0.43855	0.268436455	10.26843646
9	9.271	0.9271	0.46017925	0.426632183	10.42663218
10	9.811	0.9811	0.48852075	0.479287708	10.47928771
11	12.619	1.2619	0.47435	0.598582265	10.59858227
12	12.061	1.2061	0.484046	0.583807881	10.58380788
13	10.21	1.021	0.50418325	0.514771098	10.5147711
14	7.282	0.7282	0.44451675	0.323697097	10.3236971
15	5.569	0.5569	0.35949175	0.200200956	10.20020096
16	4.522	0.4522	0.264025	0.119392105	10.11939211
17	7.138	0.7138	0.1678125	0.119784563	10.11978456
18	13.462	1.3462	0.11112925	0.149602196	10.1496022
19	12.514	1.2514	0.07532925	0.094267023	10.09426702
20	7.639	0.7639	0.04997075	0.038172656	10.03817266
21	8.998	0.8998	0.03281675	0.029528512	10.02952851
22	6.733	0.6733	0.02162925	0.014562974	10.01456297
23	5.941	0.5941	0.01417075	0.008418843	10.00841884
24	8.632	0.8632	0.00895	0.00772564	10.00772564