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- Info
Effects of suburbanization upon snowmelt runoff
| Author: |
Buttle, J.M. |
| Date: |
1990 |
| Periodical: |
Hydrological Sciences Journal |
| Abstract: |
The influence of suburbanization upon runoff response to snowmelt and rain-on-snow inputs was examined for a small drainage basin in south-central Ontario. Modification of more than 50% of the basin area over a 14 year period led to a six-fold increase in the spring quick flow response ratio and an increase in the number of snowmelt events that generate appreciable quick flow. Anticipated changes in mean peak discharge, time of rise and quick flow response ratio did not emerge, and the influence of development upon these stream flow characteristics may have been overshadowed by annual changes in basin antecedent conditions. The distinction between hydrograph properties associated with snowmelt and rain-on-snow events has become more pronounced with suburbanization. Rain-on-snow generated higher maximum peak flows and lower average peak discharge per unit input compared with snowmelt, and these differences were accentuated by development of the basin. Rain-snow also produced more variable time of rise values, while the reduction in hydrograph recession coefficients that accompanied suburban development was most apparent for snowmelt events. The results suggest that suburbanization can have a subtle, yet real, influence upon basin runoff regime during spring snowmelt. |
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