This paper demonstrates state of the arts stochastic risk analyzes in assisting decision-making processes in achieving the project objectives in terms of the estimating project costs under uncertainty. The objectives of this study were to; (i) analyze the feasibility of the Trans Sumatra toll road projects section of Medan-Binjai (25.46 km), Indonesia, and (ii) identify and quantify the toll road risk and uncertainty variables influencing the economic feasibility of the project using stochastic approach. This study identified that the risk variables in this study may include; Indonesia Certificate Bank (SBI), inflation, volume of traffic (vehicles), operation and maintenance (O&M) costs, construction costs, land accusation costs, Jakarta Inter-Bank Offer Rate (JIBOR), and design (EED/FED). The initial results of this study (Scenario 1), using concession period of a-35 years with an implementation of the initial tariff of class I vehicles (Rp. 750 / km) showed that the project was considered not financially feasible as 90% probability of the projected net present value (NPV) was negative at the range of Rp. -1.06 trillion to Rp. 2.57 trillion. The project would be financially feasibility after conducting mitigation processes for those the identified risks, such as; providing the government supports (GSs) as much as 40% of the total construction costs as well as land acquisition costs (Scenario 3). This scenario has resulted that there was 90% probability of the projected NPV would be positive at the range of Rp. 0.54 million to 1.894 million. The implementation of the stochastic risk analysis may assist the project managers comprehensively in developing decision-making processes in financing the toll road project.

The main purpose of this research is to develop strategies for applying individual-scale rainwater harvesting technology to support sustainable urban agriculture to support food security in sustainable urban areas. The research was conducted at labaratory Applying Individual Scale Rainwater in Green House Housing Blok A. No. 1, Sialang Munggu, Pekanbaru. This study was conducted for four month, in Juni 2020 to October 2020. The research method used is analytical hierarchy process (AHP).whose analysis is supported using AHP Simon C Barnand United Kingdom (SCBUK) software, as well as establishing one identified single respondent who is considered a representative contributes significantly to recommending the assessment / justification of experts namely one of the lecturers of the Faculty of Engineering of Riau University who has implemented and pursued the field of research implementation of RWH Technology combined with IoT-based Agricultural Technology to support urban agriculture programs. The main results of the research stated that the plan of collaboration between the government and the community occupies the top priority supported by the implementation of successive PAH technology ground tanks, head tanks and hybridization of ground and head tanks supported by factors of land availability, construction costs and operational and maintenance costs.