Abstract:
Rainwater harvesting is going to be the most applicable method for eliminating
water scarcity and to meet the escalating demand. Hydrological analysis is
unavoidable in any water harvesting structural designing. A study was done at
KCAET, Tavanur to analyze the rainfall-runoff characteristics by selecting the college
playground as the study area. Runoff for seven storms was measured and the runoff
volume obtained was 9.13m 3 , 10.55 m 3 , 102.01 m 3 , 9.71 m 3 , 37.32 m 3, 11.45 m 3 and
9.22 m 3 respectively. A relation between discharge and corresponding head for the
notch was calculated as
Q = 0.7661H
1.4503
.The R 2 value obtained was 0.98. The runoff coefficient for the
compacted study area was 0.12. Unit hydrograph from various storm hydrograph
were derived and the unit hydrograph for the storm on P 1 and P 7 was considered for
the derivation of representative unit hydrograph. A relation between rainfall and
runoff was found out as Y = 0.201X – 0.8467 and the R 2 value was 0.98. From
rainfall chart analysis, a relation between maximum intensity and duration was
obtained as Y = 9.0029X–0.6986. The R 2 value was 0.9506.
