Table 4.

Rainfall interception at the urban forest canopy level.

Flood analysis eventsaActual precipitationInterception (%)
YearAmount/duration (mm [hours])DatePb(mm)Duration (hours)Rural SubRADCity SubRAD
Leaf-offLeaf-onLeaf-offLeaf-on
20051.6 [3]Jan. 9, 19956457.4%8.7%2.4%4.9%
10040.4 [2]Apr. 3, 1996c4969.1%9.7%3.8%7.4%
2532.0 [2]Jan. 10, 1995d3239.6%11.0%5.7%8.9%
522.4 [2]Feb. 28, 199124415.3%17.9%6.4%10.7%
211.4 [1]Feb. 18, 199615232.8%36.9%9.9%19.7%
  • a From Sacramento County Drainage Manual 1997.

  • b Precipitation at base station.

  • c Storm occurs during leaf-on time.

  • d 97% rainfall in first 2 hours.