Drainage Network Modelling for Water‐Sensitive Urban Design

Abstract

While drainage network models may be relatively easy to assemble as a prerequisite to site selection for infrastructure supporting suburbanisation with Water‐Sensitive Urban Design (WSUD), this is unlikely to be the case if the terrain is very subdued. Both ab initio and retro‐fit WSUD implementation for such terrain refers, in the first instance, to a drainage network model that includes information on the scope for optimising residential space while conforming to: (1) statutory planning rules about the provision of public open space; and (2) WSUD drainage network design such that runoff waters are retained long enough to allow at least temporary storage. It is shown in this research that a technique applied to condition a LiDAR DEM can accurately model the drainage network of a basin at the land‐parcel scale. The drainage network for ab initio WSUD is best defined using multi‐flow modelling, with the relative significance of stream segments indicated by their stream order derived using the Strahler method. In contrast, when applying the retro‐fit WSUD, the relative significance of segments given by the Shreve stream order method was found to be more useful. The approaches described in this article are designed to support the initial site planning stage and avoid the need for immediate and expensive detailed field survey. At the same time they can be deployed to show how much scope there is for WSUD retro‐fit in established housing areas up‐stream of an infill development area. Thus, basin‐wide appraisal is facilitated and the need for earthmoving is minimised.

Potentially Toxic Concentrations of Synthetic Pyrethroids Associated with Low Density Residential Land Use

“…Individual wetland sub-catchments were first determined from their primary catchment 10 m flow-weighted digital elevation models (DEMs) in ArcGIS 10.3 using methods adapted from Kunapo et al (2009). Using the spatial analyst extension, a DEM was derived using TOPOGRID from LiDAR 5 m contours, with flows conditioned to stream layers and wetlands.…”

Urban Wet‐Weather Flows

“…Model Applications: Urban Drainage Models. Kunapo, Chandra, and Peterson (2009) to be treated to meet the discharge standard within a given probability. The model considers that the pollutants can be mobilized during the early stage of a storm.…”

Techno-Economic Analysis of Hybrid Drainage Systems in South Australia

“…The consequence of this puts more stress on urban water systems and adversely changes the hydrological cycle in urban catchments. The primary feature of Water Sensitive Urban Design (WSUD) is that the complete water cycle is taken into consideration in urban design [4]. The use of WSUD in urban stormwater harvesting represents an opportunity to provide a new water resource whilst capping the amount of stormwater that is sent to the CDS.…”