Flexibility - a planning criterion for stormwater management
Flexibility - a planning criterion for stormwater management
Flexibility - a planning criterion for stormwater management
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11 th International Conference on Urban Drainage, Edinburgh, Scotland, UK, 2008<br />
Table 1: Scenarios of future development in Kupferzell<br />
Name of scenario Description<br />
Linear scenario (lin) Extrapolation of the actual development based on statistical in<strong>for</strong>mation.<br />
Loading case scenario (lf) Combination of the results of a sensitivity analysis with plausible<br />
extremes <strong>for</strong> the boundary conditions. Maximum load <strong>for</strong> the system.<br />
Growth-oriented scenario Boundary conditions <strong>for</strong> a individualistic and consumer-oriented<br />
(wo)<br />
Conservational scenario<br />
(ko)<br />
society, based on a literature study.<br />
Boundary conditions <strong>for</strong> a society with a focus on ecology and social<br />
engagement<br />
Each of the four scenarios listed in Table 1 is representing a state in 50 years from now.<br />
Considered are changes regarding heavy rainfall (design storm), annual rainfall, temperature<br />
and evapotranspiration, population, economical growth, landuse (commercial, residential,<br />
agriculture, <strong>for</strong>est), water consumption (industry, private), water pollution and traffic load.<br />
Table 2: Variants <strong>for</strong> <strong>stormwater</strong> <strong>management</strong> in Kupferzell<br />
Combined sewer system New areas will be drained with a combined sewer system<br />
(mw)<br />
Separate sewer system New areas will be drained with a separated sewer system<br />
(tw)<br />
Decentralised system Stormwater runoff from new areas will be managed with a decentralised<br />
(dw)<br />
infiltration system<br />
Extended decentralised Stormwater runoff from new areas will be managed with a decentralised<br />
system (dwa)<br />
infiltration system. In addition 20% of the existing impervious area will<br />
be disconnected, <strong>for</strong> another 20% green roofs will be implemented and<br />
20% of the water supply will be covered by rainwater utilisation.<br />
Table 3: Indicators <strong>for</strong> assessing the variants under different scenarios<br />
Field Group Indicator Category<br />
Ecology<br />
Economy<br />
Society<br />
20-year peak flow (HQ20) Quantitative<br />
Hydraulic<br />
Mean flow (MHQ) Quantitative<br />
Average low flow (MNQ) Quantitative<br />
Annual load COD Quantitative<br />
Annual load suspended solids (SS) Quantitative<br />
Pollution load<br />
Annual load nitrogen (N)<br />
Annual load phosphorus (P)<br />
Quantitative<br />
Quantitative<br />
Annual load copper (Cu) Quantitative<br />
Annual load lead (Pb) Quantitative<br />
Marsh (FG) Qualitative<br />
Water balance<br />
Local climate (KK)<br />
Groundwater renewal (GWN)<br />
Qualitative<br />
Quantitative<br />
Evapotranspiration (ETR) Quantitative<br />
Efficiency of Resources (Nu_Res) Qualitative<br />
Technology Diversity of technologies (Ver_viel) Quantitative<br />
Overflow volume V(Ü)_Ret Quantitative<br />
Investment cost (IK) Quantitative<br />
Economy<br />
Operational cost (BK)<br />
Use of resources and energy (R/E)<br />
Quantitative<br />
Qualitative<br />
human-resource allocation (Pers) Qualitative<br />
Utility values(NW) Qualitative<br />
Sociology<br />
Functional value (FW)<br />
Presence (Präs)<br />
Qualitative<br />
Qualitative<br />
Public participation (BB) Qualitative<br />
Area demand (A_nutz) Quantitative<br />
Spatial <strong>planning</strong> Diversity (KR) Qualitative<br />
Time horizon (t_Plan) Quantitative<br />
8 <strong>Flexibility</strong> - a <strong>planning</strong> <strong>criterion</strong> <strong>for</strong> <strong>stormwater</strong> <strong>management</strong>
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