Abstract
Sustainable urban drainage systems (SUDS) or eco-drainage system has been implemented in developed countries. The aims of the construction of the system are: to minimize surface runoff by capturing and temporarily retain it, to improve the quality of surface runoff, to infiltrate stormwater, to increase evapotranspiration, and to enhance landscape aesthetic value. Learning from the success of the implementation of SUDS in developed countries, the paper presents a model of eco-drainage system for residential area in Indonesia, which consists of rainwater harvesting system (RWHS) and retention ponds. A simulation of stormwater and surface runoff utilization is also presented. At 14,602.26 m2 bare land in Mojokerto Regency, East Java, which is transformed into residential area, the model of eco-drainage system could reduce surface runoff volume almost by 70%. It is recommended to adjust the dimension of rainwater storage tank and retention ponds in order to reduce more surface runoff volume.
Highlights
The impact of land use change on hydrological variables has been discussed since a few decades ago
Eco-drainage system has been established for surface runoff reduction as well as environment health around the world
In Indonesia, the methods to achieve proper eco-drainage system have been stated in ministerial regulation
Summary
The impact of land use change on hydrological variables has been discussed since a few decades ago. The system aims to remove excess water as fast as possible This system causes several negative impacts [2], such as; increasing downstream flood discharge, reducing the amount of stormwater infiltrates to the ground which further causes the reduction of groundwater level, and degradation of strowmwater quality due to inflow from contaminated-surface runoff, i.e. oil, organic matter, and heavy metal. A bare land of 14,602.26 m2 in Mojokerto Municipality, East Jawa, Indonesia, is planned to be developed into a real estate This development may cause the increasing of runoff volume. Other data to be used in the analysis are data of monthly average number of rain and dry days, and average temperature Those data were the main data to observe monthly water balance in the rainwater storage tank and in the retention pond.
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