Water is extremely critical for human survival. It is therefore important to efficiently manage integrated water resources, which includes basins, watersheds, and wadies. In this study, the freely available data was used, which included a digital elevation model, soil and geological maps, satellite imageries, and daily precipitation records. Furthermore, remote sensing techniques and geographic information system were also integrated in this study. The linear and areal aspects, along with the longitudinal profile were also included, and the hydrologic soil groups (HSGs), land use/land cover (LULC), and curve number (CN) were identified for the main basin of the Riyadh capital. The morphometric analysis indicated that the total area of the main basin was 8500 km², with 40 watersheds and the highest stream order as eighth. The drainage density of the main basin was 1.57 km/km². Impermeable surface constituted most of the basin area, as group D was the most prevalently found HSG, constituting 71% of the total basin area. Additionally, the main basin had a highly steep slope, with varying elevations. Furthermore, four types of LULC were identified in the basin namely urban-based, barren land, cultivated land, and ways. The CN for every cell of the main basin ranged from 64 to 98, and the basin weighted CN was found to be 92. The potential direct runoff ranged from 10 to 59 mm. More than 70% of the total area was found to be vulnerable to high and very high runoffs (> 35 mm). These values confirmed the occurrence of flood events, particularly in urban areas and cultivated lands.

水对人类的生存至关重要。因此，重要的是要有效地管理包括流域，流域和河道在内的综合水资源。在这项研究中，使用了可免费获得的数据，其中包括数字高程模型，土壤和地质图，卫星图像以及每日降水记录。此外，这项研究还整合了遥感技术和地理信息系统。还包括线性和面积方面以及纵向剖面，并为利雅得首都的主要盆地确定了水文土壤组（HSG），土地利用/土地覆盖（LULC）和曲线数（CN）。形态计量学分析表明，主盆地总面积为8500 km ²，拥有40个分水岭，最高的河流流量排名第八。主盆地排水密度为1.57 km / km ²。防渗层占盆地面积的大部分，因为D组是最常见的HSG，占盆地总面积的71％。此外，主盆地的坡度很高，高度各不相同。此外，在流域确定了四种土地利用，土地利用变化类型，即城市土地，贫瘠土地，耕地和道路。主盆地每个单元的CN范围为64至98，盆地加权CN为92。潜在直接径流范围为10至59 mm。发现总面积的70％以上易受高径流和高径流（> 35毫米）的影响。这些值证实了洪水事件的发生，特别是在城市地区和耕地中。