Question

Covert from a 15 minute UH to a 1hr UH Time (Minutes) Discharge (m3/s) 0 0...

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

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