Application of Urban Stormwater Drainage Design & Modelling Based on High Resolution Satellite Technology.

Kashif Hussain

Diplomová práce

Abstract:

The urban stormwater runoff and water quantity management issues could not be resolvable without identification of drainage area and accurate flow networks. Therefore, the urban watersheds hydrology is totally different when compared with natural environments and it requires advance evaluation techniques. In the absence of high resolution rainfall data, empirical reduction formula is used for daily rainfall data conversion into short duration rainfall data sets. Extreme type-1 distribution method is used for frequency analysis, and derivation intensity duration frequency (IDF) curve. In this study the catchment delineation was performed by combining ArcGIS core application (including goeprocessing surface modeling and Spatial Analyst extension), high resolution remote sensing data and field observations. Due to area extent limitation for Rational Method, the selected catchments were divided into sub-catchments of area less than 80.9 ha or equal. The GIS and RS methodology was developed for determination of Rational Method and stormwater management model (SWMM) parameterization in a large urban catchment. The calculation of low resolution sub-catchment parameterization is the more challenging part and has many uncertainties factor involved. Few parameters such as runoff coefficient (C) Curve Number (CN) overland flow mannings roughness (n) and imperviousness is directly related to land use type. Thus, land use type classification was performed using Quick Bird satellite image adopting the Maximum Likelihood Classification (MLC) method and determined seven land use types of each catchment. For surface runoff modelling this study consist of two models, first Rational Method is used to estimate the surface runoff of selected catchments. In second part Stormwater Management Model (SWMM) is also used to estimate the surface runoff. The SWMM model runoff results are compared to Rational Method. Comparatively surface runoff values calculated by Rational Method are much higher than calculated surface runoff values by SWMM. The Hydraulic Flow carrying capacity was determined by continuity equation and compared with surface runoff values calculated by above described methods. The Shahi Katha drain has much higher flow carrying capacity. The Airport Tehkal Payain and University Road Tehkal Bala drains flow carrying capacity was very low in comparison to calculated flow values with some bottle necks because of bridge and irregular section shapes presence. Thus, both drains are causing flood hazards in urban area. The flood hazards might be controlled or managed by increasing the drains size and replacement of irregular sections into rectangular proper sections.

Keywords

Flow carrying capacity, GIS, Maximum Likelihood Classification, Parameters, QuickBird, Rational Method, Stormwater, SWMM

Jazyk práce: angličtina

Datum vytvoření / odevzdání či podání práce: 13. 4. 2016

Obhajoba závěrečné práce

• Vedoucí: doc. Ing. Jakub Štibinger, CSc.

Česká zemědělská univerzita v Praze

Fakulta životního prostředí

Magisterský studijní program / obor:
Krajinné inženýrství / Land and Water Management