WRPM Consultants

The Metro Rail Project is one of the prestigious infrastructure projects of the state of Kerala. For the maintenance of the coaches of proposed Metro, a low lying area was identified. It is given that the proposed formation level of the lower terrace was +1.323. This area was inundated to a level of +1.903 on 27.6.2013 and +2.76 m. It is evident from the present inundation that the formation level should have to be raised. However, raising the level of the lower terrace to the level corresponding to maximum flood recorded at the nearby bridge (4.033+freeboard) will not be economical as the cost involved for rising the proposed ground level by a cm is very large.

Th Hence, an optimum level is to be worked out based on the integrated flood study of the channel network which is connected to the area and also on the existing standards in the railway (50 year flood condition). The work of assessing an optimum value for the lower terrace level by conducting an integrated flood study, considering the channel network system, was entrusted with Dr. N.Sajikumar

1. To determine an optimal formation level for the proposed metro maintenance yard by conducting an integrated flood assessment of channel network.
2. To propose a proper arrangement for draining out the water from the proposed yard and its neighbouring area.

This study was conducted by collecting necessary field data, and by using frequency analysis and modelling of the channel network. From the analyses, it was found that the Minimum terrace level to be maintained is +3.75m (50-Year Flood level +3.00 and 0.75 Free

Inhabitants of a local self-government was facing acute water shortage during summer season. They wanted to design a dedicated water supply and assess the availability of potential source for establishing the water supply scheme for the Panchayath. They also wanted to assess the viability of the using the available water in the quarries as a potential source.

The client wanted to identify the potential sources for a dedicated water supply for the panchayath, either surface water or groundwater source. They also wanted to assess the viability of the using the water available in the abandoned quarries as a potential source.

From the analysis, it was found that the water from the abandoned quarry cannot be used as a potential source. The surface water source was also not sufficient to satisfy the demand in the summer season. Groundwater sources along with surface water source must be used for the scheme. The position for extracting the groundwater was also identified.

The rainwater from a residential project must be let off to one of the drains of Smart City Project, Kochi. The client must take permission from the concerned for letting out the water. The authorities require an estimation of maximum flow towards the drain from the residential plot as per the guidelines put forth by the Ministry of Urban development.

The client required the estimation of the design flow for the drainage from the residential complex as per the guidelines of Ministry of Urban development. They also requested to size the drain/pipe connecting the public drain and the outlet from the residential complex

From the analysis, it was found that the required size of the drain was much smaller than the size which was proposed to be provided.

The block Panchayath has long term nuisance of water logging problems due to its proximity to sea and drainages. Inadequate drainage caused the inundation of many areas of the block panchayath.

The client required comprehensive study of the situation and provides solutions in such manner that these solutions are split into small projects which can be taken up at gramma panchayath level of at ward level.

The solution were divided into solutions that can be taken up by individual gramma panchayath and the projects separately but following the hierarchy of the projects in a systematic way.

Enormous amounts of water flow out of a dam when it fails catastrophically, or when excess water is released through the spillways and it adversely affects people, infrastructure, and the environment downstream of the dam. The study envisages the preparation of Emergency Action Plan (EAP) to act as interface with the emergency operation plans of district and state agencies to ensure effective and timely implementation of response action.

The client required to prepare the flood inundation maps for the different scenarios on the downstream of dams. Based on this, the Emergency action indicating “who does what, where, when and how” is to be proposed for the evacuation of people.

The document will assist the disaster preparedness of the District disaster management authority.

For most of the existing old dams, the estimation of probable maximum flood and the spillway capacity were based on empirical procedures. As part of Dam safety and Rehabilitation and improvement project, one of the components was to estimate the Design flood and carry out the routing of design flood, so as to assess the safety of dam.

The client required the working out of the design flood corresponding to magnitude of rainfall for the basin in the study and routing of the flood through the spillway of dams. The maximum water level in the reservoir is computed to assess the safety of dams.

Hydrology review study gives an idea of the appropriateness of the design flood adopted for the design of outlet works like spillways. Also it can be considered as a reference for assessment of the safety of dams due to changes in rainfall pattern.

Piping effect in many central spans of the regulator was observed even without storing water upto the desired maximum level. Also, the occurrence of piping effect caused the majority of the blocks of the launching apron on the downstream got displaced from their original position and sunk into the bed, exposing the end of impervious apron.

The client required to investigate the root cause and suggest rectification measures to render the structure for the intended purpose to which it was built.

The design of the rectification works to be carried out for making use of the regulator to cater the intended use of water was reported.

The client was a contracting firm for the augmentation work of a water supply scheme for Municipal corporation in Kerala. The pumping main was of diameter 1.149m and length of 5.21km. The main was supposed to carry a discharge of 1.232cumec. There were two parallel pumps of rated head 67m and discharge 0.616cumec respectively.

The client required the surge analysis of the entire system and assessment of the criticality of the water hammer under pump drip cases.

The study reveals that the system is predominantly subjected to down-surge rather than upsurge. This indicates the utmost necessity of providing surge protection devices. The suggested solution includes a combination of one-way surge tank, air cushion valves and air valves.

The state agency for Kerala which has the mandate for the safe supply of water wanted to augment their areal coverage in a region. Though the capacity of the intake structure is more than the required amount, the availability of the water restricts the expansion process.

Hence the client defines the scope as to enhance the water availability to satisfy the demand for the expansion project. Several options were sought and finally arrived at the enhancing the water availability by constructing a check dam on the 300m wide river.

The study proposed a check dam across the major river in Kerala so as to enhance the water avaialbility during summer season.

A local self-government wanted to augment the water availability during the summer seasons. The river dries up during the summer season. Though the bed surface was dried up during summer, interflow through the bed existed. This interflow could be arrested to enhance the water availability and recharge to the neighbouring area

A clay bottom below the sand bed ideally suited for a subsurface dyke.This interflow could be arrested to enhance the water availability and recharge to the neighbouring area.

The study proposed a subsurface dyke across the major river in Kerala so as to enhance the water avaialbility during summer season.